ExtVal: Rendering component with visual indication for required fields
Hi there, I've found some information at http://wiki.apache.org/myfaces/Extensions/Validator/DevDoc, that it is possible to mark components who require a value via a component initializer. In addition I would like to use bean validation and to annotate a class' attributes and mark the input field or even the label of the input field: 1. @NotNull for an attribute let's say "name" 2. Having an output label referencing an input field 3. Marking all labels referencing to required fields with a '*' resulting in "*name" I also found the renderer interceptor which seems to be a better choice for me, since I want to manipulate the rendering of the label rather than the input component. Any suggestions? Thanks. Traumziele - von Beschreibung bis Buchung jetzt kompakt auf den Reise-Seiten von Arcor.de! http://www.arcor.de/rd/footer.reise
Re: ExtVal: Rendering component with visual indication for required fields
hello, The main issue with your requirement is that at the time of the rendering of the outputlabel, the input text isn't treated yet (because the label is most of the time in front of the input field). So the required property of the input field isn't set yet by the extval framework. (only the information of the view is applied, not the annotations on the properties of the classes) You mention also the renderer interceptor. But standard this renderer is only hit for any editableValueHolder( like input fields or drop downs). Since those are the type of components we are interested in ( in doing the validation). The labels aren't treated at this moment (see processComponent method in AbstractValidationInterceptor) so you should write a custom renderer interceptor to achieve it. Your requirements is already on my development list (as an add-on) for a few months now but had not the time to start with it. So you need to create (at least) the following items: - A custom renderer interceptor for handling the output labels - A component initializer that put the * in front of it (caution that it isn't done multiple times) - The component initializer should search for the referenced component (by the for attribute) and do the component initialization of this EditableValueHolder. Now the @NotNull is taken into account and the * can be placed. You can also look at the Trinidad support module http://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/component-support/trinidad-support. It has a label that is capable of putting a * behind the text so it is possible that there is already the kind of solution to your problem. You need to port it then only to the standard JSF (or use Trinidad in your project). Regards Rudy On 26 April 2010 14:57, wrote: > Hi there, > > I've found some information at > http://wiki.apache.org/myfaces/Extensions/Validator/DevDoc, that it is > possible to mark components who require a value via a component initializer. > In addition I would like to use bean validation and to annotate a class' > attributes and mark the input field or even the label of the input field: > > 1. @NotNull for an attribute let's say "name" > 2. Having an output label referencing an input field > 3. Marking all labels referencing to required fields with a '*' resulting > in "*name" > > I also found the renderer interceptor which seems to be a better choice for > me, since I want to manipulate the rendering of the label rather than the > input component. > > Any suggestions? > > Thanks. > > Traumziele - von Beschreibung bis Buchung jetzt kompakt auf den > Reise-Seiten von Arcor.de! http://www.arcor.de/rd/footer.reise >
Re: ExtVal: Rendering component with visual indication for required fields
hi, short addition: basically it depends on the component lib you are using. e.g. myfaces trinidad supports such indicators out-of-the-box (also based on meta-data - e.g. in combination with extval). -> extval + trinidad -> no additional effort. without trinidad you have to implement a small add-on for extval. you can have a look at [1]. you just have to replace the trinidad specific parts and you have to add the indicator on your own (depending on the found meta-data). e.g.: instead of using coreOutputLabel at: ExtValUtils.configureComponentWithMetaData(facesContext, coreOutputLabel, metaDataResult); you could use the targetComponent (= the input component). after this call you can check if the targetComponent is required. so you keep the compatibility with the required attribute of the component and you can re-use the existing implementation of extval. if you are allowed to donate the add-on, i would commit it to os890 (after reviewing it). regards, gerhard [1] https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/component-support/trinidad-support/src/main/java/org/apache/myfaces/extensions/validator/trinidad/interceptor/TrinidadRendererInterceptor.java http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces 2010/4/26 Rudy De Busscher > hello, > > The main issue with your requirement is that at the time of the rendering > of > the outputlabel, the input text isn't treated yet (because the label is > most > of the time in front of the input field). So the required property of the > input field isn't set yet by the extval framework. (only the information of > the view is applied, not the annotations on the properties of the classes) > > You mention also the renderer interceptor. But standard this renderer is > only hit for any editableValueHolder( like input fields or drop downs). > Since those are the type of components we are interested in ( in doing the > validation). > The labels aren't treated at this moment (see processComponent method in > AbstractValidationInterceptor) so you should write a custom renderer > interceptor to achieve it. > > Your requirements is already on my development list (as an add-on) for a > few > months now but had not the time to start with it. > > So you need to create (at least) the following items: > - A custom renderer interceptor for handling the output labels > - A component initializer that put the * in front of it (caution that it > isn't done multiple times) > - The component initializer should search for the referenced component (by > the for attribute) and do the component initialization of this > EditableValueHolder. Now the @NotNull is taken into account and the * can > be placed. > > You can also look at the Trinidad support module > > http://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/component-support/trinidad-support > . > It has a label that is capable of putting a * behind the text so it is > possible that there is already the kind of solution to your problem. You > need to port it then only to the standard JSF (or use Trinidad in your > project). > > Regards > Rudy > > On 26 April 2010 14:57, wrote: > > > Hi there, > > > > I've found some information at > > http://wiki.apache.org/myfaces/Extensions/Validator/DevDoc, that it is > > possible to mark components who require a value via a component > initializer. > > In addition I would like to use bean validation and to annotate a class' > > attributes and mark the input field or even the label of the input field: > > > > 1. @NotNull for an attribute let's say "name" > > 2. Having an output label referencing an input field > > 3. Marking all labels referencing to required fields with a '*' resulting > > in "*name" > > > > I also found the renderer interceptor which seems to be a better choice > for > > me, since I want to manipulate the rendering of the label rather than the > > input component. > > > > Any suggestions? > > > > Thanks. > > > > Traumziele - von Beschreibung bis Buchung jetzt kompakt auf den > > Reise-Seiten von Arcor.de! http://www.arcor.de/rd/footer.reise > > >
AW: ExtVal: Rendering component with visual indication for required fields
Hi Gerhard, hi Rudy, thank you for your quick response. I tried to proceed just like you suggested but the meta data for the bean validation annotations is not found. ExtValUtils.getTransformedMetaData() always returns an empty map. The reason seems to be that DefaultValidationStrategyFactory.create(String) only holds JPA-Mappings and no BV-Mappings. Am I missing some jars or where can I find something like javax.validation.constraints.NotNull[Validation]Strategy or bean:notNull[Validation]Strategy which is looked for? For my own annotation @RequiredExactlyOneOf (similar to ExtVal's @RequiredIf) I managed to extract the meta data with my own transformer, but I have to take a closer look tomorrow how to go on from that point. Thomas -Ursprüngliche Nachricht- Von: Gerhard Petracek [mailto:gerhard.petra...@gmail.com] Gesendet: Montag, 26. April 2010 17:49 An: MyFaces Discussion Betreff: Re: ExtVal: Rendering component with visual indication for required fields hi, short addition: basically it depends on the component lib you are using. e.g. myfaces trinidad supports such indicators out-of-the-box (also based on meta-data - e.g. in combination with extval). -> extval + trinidad -> no additional effort. without trinidad you have to implement a small add-on for extval. you can have a look at [1]. you just have to replace the trinidad specific parts and you have to add the indicator on your own (depending on the found meta-data). e.g.: instead of using coreOutputLabel at: ExtValUtils.configureComponentWithMetaData(facesContext, coreOutputLabel, metaDataResult); you could use the targetComponent (= the input component). after this call you can check if the targetComponent is required. so you keep the compatibility with the required attribute of the component and you can re-use the existing implementation of extval. if you are allowed to donate the add-on, i would commit it to os890 (after reviewing it). regards, gerhard [1] https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/componen t-support/trinidad-support/src/main/java/org/apache/myfaces/extensions/valid ator/trinidad/interceptor/TrinidadRendererInterceptor.java http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces 2010/4/26 Rudy De Busscher > hello, > > The main issue with your requirement is that at the time of the rendering > of > the outputlabel, the input text isn't treated yet (because the label is > most > of the time in front of the input field). So the required property of the > input field isn't set yet by the extval framework. (only the information of > the view is applied, not the annotations on the properties of the classes) > > You mention also the renderer interceptor. But standard this renderer is > only hit for any editableValueHolder( like input fields or drop downs). > Since those are the type of components we are interested in ( in doing the > validation). > The labels aren't treated at this moment (see processComponent method in > AbstractValidationInterceptor) so you should write a custom renderer > interceptor to achieve it. > > Your requirements is already on my development list (as an add-on) for a > few > months now but had not the time to start with it. > > So you need to create (at least) the following items: > - A custom renderer interceptor for handling the output labels > - A component initializer that put the * in front of it (caution that it > isn't done multiple times) > - The component initializer should search for the referenced component (by > the for attribute) and do the component initialization of this > EditableValueHolder. Now the @NotNull is taken into account and the * can > be placed. > > You can also look at the Trinidad support module > > http://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/component -support/trinidad-support > . > It has a label that is capable of putting a * behind the text so it is > possible that there is already the kind of solution to your problem. You > need to port it then only to the standard JSF (or use Trinidad in your > project). > > Regards > Rudy > > On 26 April 2010 14:57, wrote: > > > Hi there, > > > > I've found some information at > > http://wiki.apache.org/myfaces/Extensions/Validator/DevDoc, that it is > > possible to mark components who require a value via a component > initializer. > > In addition I would like to use bean validation and to annotate a class' > > attributes and mark the input field or even the label of the input field: > > > > 1. @NotNull for an attribute let's say "name" > > 2. Having an output label referencing an input field > > 3. Marking a
Re: ExtVal: Rendering component with visual indication for required fields
hi thomas, basically you have 3 possibilities with extval: - use simple but dynamic validation, jpa based validation and cross-validation -> use extval-core + extval-property-validation (+ your custom constraints) - use bean-validation + some advanced extval mechanisms for it -> use extval-core + extval-bean-validation + an impl. of bv (+ custom bv-constraints) - create your own validation module(s)/concepts -> use extval-core + your own mechanisms on top of it for sure you can combine all modules. you just have to take care that you don't mix different types of constraints and their concepts (esp. in combination with extval add-ons). however, i would suggest that you just use one validation-module of extval. and as soon as you are using it for a real app, you should also think about tweaking it (e.g. see [1]) two (simple) sample setups for extval + bv are available at [2] and [3]. a nice intro is available at [4]. regards, gerhard [1] http://wiki.apache.org/myfaces/Extensions/Validator/JSR303/Advanced [2] https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/examples/hello_bean-validation/ [3] https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/examples/feature-set_02/ [4] http://people.apache.org/~gpetracek/myfaces/extval/extval_chapter.html http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces 2010/4/26 Tom M. > Hi Gerhard, hi Rudy, > > thank you for your quick response. > > I tried to proceed just like you suggested but the meta data for the bean > validation annotations is not found. ExtValUtils.getTransformedMetaData() > always returns an empty map. The reason seems to be that > DefaultValidationStrategyFactory.create(String) only holds JPA-Mappings and > no BV-Mappings. Am I missing some jars or where can I find something like > javax.validation.constraints.NotNull[Validation]Strategy or > bean:notNull[Validation]Strategy which is looked for? > > For my own annotation @RequiredExactlyOneOf (similar to ExtVal's > @RequiredIf) I managed to extract the meta data with my own transformer, > but > I have to take a closer look tomorrow how to go on from that point. > > Thomas > > > > > -Ursprüngliche Nachricht- > Von: Gerhard Petracek [mailto:gerhard.petra...@gmail.com] > Gesendet: Montag, 26. April 2010 17:49 > An: MyFaces Discussion > Betreff: Re: ExtVal: Rendering component with visual indication for > required > fields > > hi, > > short addition: > > basically it depends on the component lib you are using. > e.g. myfaces trinidad supports such indicators out-of-the-box (also based > on > meta-data - e.g. in combination with extval). > -> extval + trinidad -> no additional effort. > > without trinidad you have to implement a small add-on for extval. > you can have a look at [1]. you just have to replace the trinidad specific > parts and you have to add the indicator on your own (depending on the found > meta-data). > > e.g.: instead of using coreOutputLabel at: > ExtValUtils.configureComponentWithMetaData(facesContext, coreOutputLabel, > metaDataResult); > you could use the targetComponent (= the input component). after this call > you can check if the targetComponent is required. > so you keep the compatibility with the required attribute of the component > and you can re-use the existing implementation of extval. > > if you are allowed to donate the add-on, i would commit it to os890 (after > reviewing it). > > regards, > gerhard > > [1] > > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/componen > > t-support/trinidad-support/src/main/java/org/apache/myfaces/extensions/valid > ator/trinidad/interceptor/TrinidadRendererInterceptor.java > > http://www.irian.at > > Your JSF powerhouse - > JSF Consulting, Development and > Courses in English and German > > Professional Support for Apache MyFaces > > > > 2010/4/26 Rudy De Busscher > > > hello, > > > > The main issue with your requirement is that at the time of the rendering > > of > > the outputlabel, the input text isn't treated yet (because the label is > > most > > of the time in front of the input field). So the required property of > the > > input field isn't set yet by the extval framework. (only the information > of > > the view is applied, not the annotations on the properties of the > classes) > > > > You mention also the renderer interceptor. But standard this renderer is > > only hit for any editableValueHolder( like input fields or drop downs). > > Since those are the type of components we are interested in ( in doing > the &
Re: ExtVal: Rendering component with visual indication for required fields
short addition: @ExtValUtils: i used a local prototype - that's the reason why it didn't work for you. however, i uploaded a working implementation for trinidad at [1]. it works with the current version (e.g. [2]). regards, gerhard [1] http://people.apache.org/~gpetracek/myfaces/extval/demos/trinidad [2] http://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/ http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces 2010/4/27 Gerhard Petracek > hi thomas, > > basically you have 3 possibilities with extval: > - use simple but dynamic validation, jpa based validation and > cross-validation -> use extval-core + extval-property-validation (+ your > custom constraints) > - use bean-validation + some advanced extval mechanisms for it -> use > extval-core + extval-bean-validation + an impl. of bv (+ custom > bv-constraints) > - create your own validation module(s)/concepts -> use extval-core + your > own mechanisms on top of it > > for sure you can combine all modules. you just have to take care that you > don't mix different types of constraints and their concepts (esp. in > combination with extval add-ons). however, i would suggest that you just use > one validation-module of extval. and as soon as you are using it for a real > app, you should also think about tweaking it (e.g. see [1]) > > two (simple) sample setups for extval + bv are available at [2] and [3]. > a nice intro is available at [4]. > > regards, > gerhard > > [1] http://wiki.apache.org/myfaces/Extensions/Validator/JSR303/Advanced > [2] > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/examples/hello_bean-validation/ > [3] > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/examples/feature-set_02/ > [4] http://people.apache.org/~gpetracek/myfaces/extval/extval_chapter.html > > http://www.irian.at > > Your JSF powerhouse - > JSF Consulting, Development and > Courses in English and German > > Professional Support for Apache MyFaces > > 2010/4/26 Tom M. > > Hi Gerhard, hi Rudy, >> >> thank you for your quick response. >> >> I tried to proceed just like you suggested but the meta data for the bean >> validation annotations is not found. ExtValUtils.getTransformedMetaData() >> always returns an empty map. The reason seems to be that >> DefaultValidationStrategyFactory.create(String) only holds JPA-Mappings >> and >> no BV-Mappings. Am I missing some jars or where can I find something like >> javax.validation.constraints.NotNull[Validation]Strategy or >> bean:notNull[Validation]Strategy which is looked for? >> >> For my own annotation @RequiredExactlyOneOf (similar to ExtVal's >> @RequiredIf) I managed to extract the meta data with my own transformer, >> but >> I have to take a closer look tomorrow how to go on from that point. >> >> Thomas >> >> >> >> >> -Ursprüngliche Nachricht- >> Von: Gerhard Petracek [mailto:gerhard.petra...@gmail.com] >> Gesendet: Montag, 26. April 2010 17:49 >> An: MyFaces Discussion >> Betreff: Re: ExtVal: Rendering component with visual indication for >> required >> fields >> >> hi, >> >> short addition: >> >> basically it depends on the component lib you are using. >> e.g. myfaces trinidad supports such indicators out-of-the-box (also based >> on >> meta-data - e.g. in combination with extval). >> -> extval + trinidad -> no additional effort. >> >> without trinidad you have to implement a small add-on for extval. >> you can have a look at [1]. you just have to replace the trinidad specific >> parts and you have to add the indicator on your own (depending on the >> found >> meta-data). >> >> e.g.: instead of using coreOutputLabel at: >> ExtValUtils.configureComponentWithMetaData(facesContext, coreOutputLabel, >> metaDataResult); >> you could use the targetComponent (= the input component). after this call >> you can check if the targetComponent is required. >> so you keep the compatibility with the required attribute of the component >> and you can re-use the existing implementation of extval. >> >> if you are allowed to donate the add-on, i would commit it to os890 (after >> reviewing it). >> >> regards, >> gerhard >> >> [1] >> >> https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/componen >> >> t-support/trinidad-support/src/main/java/org/apache/myfaces/extensions/valid >> ator/trinidad/interceptor/Trini
AW: ExtVal: Rendering component with visual indication for required fields
Hi Gerhard,
what I had already used before asking in the mailing list was:
- ExtVal Core
- BeanValidation (using JSR-303 annotations)
- PropertyValidation (using basic code for custom cross validation
annotation and provided out-of-the-box annotations such as @RequiredIf)
- I did not want to use Trinidad since other component libraries are to be
used in the project.
- I have absolutely no validation code in the html templates (no validator
tags, no required attribute, nothing of that at all), only using annotations
and in consequence separating page structure/layout from validation rules in
the domain objects (also founded in the organization of the development
teams).
This combination works perfect so far: validating the data according to the
annotations, transforming messages und even generating a html maxlength
attribute for @Size.max (nice!).
Since I found it quite hard to understand how ExtVal is working in detail
(even with your hints and links stated), I found a very simple solution that
is working for me:
- I asked myself why do I need a renderer interceptor AND a component
initializer? From my point of view adding the '*' to the label text is more
a question of rendering the label's text. And I could not figure out what
Rudy meant with "... and do the component initialization of this
EditableValueHolder" or what to do since I want to change the label not the
input component.
- By obmitting the component initializer, there is no need for meta data and
a transformer...
- I used some code I found in ExtVal classes, especially from ExtValUtils.
So this is my simple (non standard?) solution which works for the @NotNull
annotation:
public class RequiredLabelRendererInterceptor extends
AbstractRendererInterceptor {
public static final String REQUIRED_SYMBOL = "*";
@Override
public void beforeEncodeBegin(FacesContext facesContext, UIComponent
uiComponent, Renderer wrapped) throws IOException {
if (uiComponent instanceof HtmlOutputLabel) {
HtmlOutputLabel labelComp = (HtmlOutputLabel)
uiComponent;
UIComponent inputComp = ...; // find by label
attribute 'for'
MetaDataExtractor extractor =
createMetaDataExtractor();
for (MetaDataEntry entry :
extractor.extract(facesContext, inputComp).getMetaDataEntries()) {
checkAndHandleRequiredAttribute(labelComp,
entry.getKey());
}
}
}
private MetaDataExtractor createMetaDataExtractor() {
return ExtValContext.getContext().getFactoryFinder()
.getFactory(FactoryNames.COMPONENT_META_DATA_EXTRACTOR_FACTORY,
ComponentMetaDataExtractorFactory.class)
.create();
}
private void checkAndHandleRequiredAttribute(HtmlOutputLabel
labelComp, String key) {
if (NotNull.class.getName().equals(key)) {
String label = (String) labelComp.getValue();
if (!label.startsWith(REQUIRED_SYMBOL)) {
labelComp.setValue(REQUIRED_SYMBOL+labelComp.getValue());
}
}
}
}
A question to:
>> e.g.: instead of using coreOutputLabel at:
>> ExtValUtils.configureComponentWithMetaData(facesContext,
>> coreOutputLabel, metaDataResult); you could use the targetComponent
>> (= the input component). after this call you can check if the
>> targetComponent is required.
Does that mean after configuring the component's attribute 'required' would
be set? I didn't try that. Is there really a need for the component
initialize and initiating the call via
ExtValUtils.configureComponentWithMetaData()?
For my already mentioned @RequiredExactlyOneOf cross validation annotation
(which works fine regarding validation), I managed to render all labels
belonging to the specified attributes via the renderer interceptor. But this
only works if the annotation is defined at the attribute that occurs first
in the html in order to manipulate the labels that are rendered later on.
Possibly there would be a better solution to avoid this tight coupling by
really using ExtVal's infrastructure!?
Tom
> -Ursprüngliche Nachricht-
> Von: Gerhard Petracek [mailto:gerhard.petra...@gmail.com]
> Gesendet: Dienstag, 27. April 2010 00:45
> An: MyFaces Discussion
> Betreff: Re: ExtVal: Rendering component with visual indication for
> required fields
>
> hi thomas,
>
> basically you have 3 possibilities with extval:
> - use simple but dynamic validation, jpa based validation and
> cross-validation -> use extval-core + extval-property-validation (+
> your
> custom constraints)
> - use bean-valida
Re: ExtVal: Rendering component with visual indication for required fields
> } > } >} > } > > A question to: > >> e.g.: instead of using coreOutputLabel at: > >> ExtValUtils.configureComponentWithMetaData(facesContext, > >> coreOutputLabel, metaDataResult); you could use the targetComponent > >> (= the input component). after this call you can check if the > >> targetComponent is required. > > Does that mean after configuring the component's attribute 'required' would > be set? I didn't try that. Is there really a need for the component > initialize and initiating the call via > ExtValUtils.configureComponentWithMetaData()? > > For my already mentioned @RequiredExactlyOneOf cross validation annotation > (which works fine regarding validation), I managed to render all labels > belonging to the specified attributes via the renderer interceptor. But > this > only works if the annotation is defined at the attribute that occurs first > in the html in order to manipulate the labels that are rendered later on. > Possibly there would be a better solution to avoid this tight coupling by > really using ExtVal's infrastructure!? > > Tom > > > > > -Ursprüngliche Nachricht- > > Von: Gerhard Petracek [mailto:gerhard.petra...@gmail.com] > > Gesendet: Dienstag, 27. April 2010 00:45 > > An: MyFaces Discussion > > Betreff: Re: ExtVal: Rendering component with visual indication for > > required fields > > > > hi thomas, > > > > basically you have 3 possibilities with extval: > > - use simple but dynamic validation, jpa based validation and > > cross-validation -> use extval-core + extval-property-validation (+ > > your > > custom constraints) > > - use bean-validation + some advanced extval mechanisms for it -> use > > extval-core + extval-bean-validation + an impl. of bv (+ custom > > bv-constraints) > > - create your own validation module(s)/concepts -> use extval-core + > > your > > own mechanisms on top of it > > > > for sure you can combine all modules. you just have to take care that > > you > > don't mix different types of constraints and their concepts (esp. in > > combination with extval add-ons). however, i would suggest that you > > just use > > one validation-module of extval. and as soon as you are using it for a > > real > > app, you should also think about tweaking it (e.g. see [1]) > > > > two (simple) sample setups for extval + bv are available at [2] and > > [3]. > > a nice intro is available at [4]. > > > > regards, > > gerhard > > > > [1] http://wiki.apache.org/myfaces/Extensions/Validator/JSR303/Advanced > > [2] > > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/exa > > mples/hello_bean-validation/ > > [3] > > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/exa > > mples/feature-set_02/ > > [4] > > http://people.apache.org/~gpetracek/myfaces/extval/extval_chapter.html<http://people.apache.org/%7Egpetracek/myfaces/extval/extval_chapter.html> > >
Re: ExtVal: Rendering component with visual indication for required fields
if the > > >> targetComponent is required. > > > > Does that mean after configuring the component's attribute 'required' > would > > be set? I didn't try that. Is there really a need for the component > > initialize and initiating the call via > > ExtValUtils.configureComponentWithMetaData()? > > > > For my already mentioned @RequiredExactlyOneOf cross validation > annotation > > (which works fine regarding validation), I managed to render all labels > > belonging to the specified attributes via the renderer interceptor. But > > this > > only works if the annotation is defined at the attribute that occurs > first > > in the html in order to manipulate the labels that are rendered later on. > > Possibly there would be a better solution to avoid this tight coupling by > > really using ExtVal's infrastructure!? > > > > Tom > > > > > > > > > -Ursprüngliche Nachricht- > > > Von: Gerhard Petracek [mailto:gerhard.petra...@gmail.com] > > > Gesendet: Dienstag, 27. April 2010 00:45 > > > An: MyFaces Discussion > > > Betreff: Re: ExtVal: Rendering component with visual indication for > > > required fields > > > > > > hi thomas, > > > > > > basically you have 3 possibilities with extval: > > > - use simple but dynamic validation, jpa based validation and > > > cross-validation -> use extval-core + extval-property-validation (+ > > > your > > > custom constraints) > > > - use bean-validation + some advanced extval mechanisms for it -> use > > > extval-core + extval-bean-validation + an impl. of bv (+ custom > > > bv-constraints) > > > - create your own validation module(s)/concepts -> use extval-core + > > > your > > > own mechanisms on top of it > > > > > > for sure you can combine all modules. you just have to take care that > > > you > > > don't mix different types of constraints and their concepts (esp. in > > > combination with extval add-ons). however, i would suggest that you > > > just use > > > one validation-module of extval. and as soon as you are using it for a > > > real > > > app, you should also think about tweaking it (e.g. see [1]) > > > > > > two (simple) sample setups for extval + bv are available at [2] and > > > [3]. > > > a nice intro is available at [4]. > > > > > > regards, > > > gerhard > > > > > > [1] > http://wiki.apache.org/myfaces/Extensions/Validator/JSR303/Advanced > > > [2] > > > > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/exa > > > mples/hello_bean-validation/ > > > [3] > > > > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/exa > > > mples/feature-set_02/ > > > [4] > > > http://people.apache.org/~gpetracek/myfaces/extval/extval_chapter.html > <http://people.apache.org/%7Egpetracek/myfaces/extval/extval_chapter.html> > > > > >
Re: ExtVal: Rendering component with visual indication for required fields
lOutputLabel)
> > > uiComponent;
> > >UIComponent inputComp = ...; // find by label
> > > attribute 'for'
> > >
> > >MetaDataExtractor extractor =
> > > createMetaDataExtractor();
> > >for (MetaDataEntry entry :
> > > extractor.extract(facesContext, inputComp).getMetaDataEntries()) {
> > >
> > checkAndHandleRequiredAttribute(labelComp,
> > > entry.getKey());
> > >}
> > >}
> > >}
> > >
> > >private MetaDataExtractor createMetaDataExtractor() {
> > >return ExtValContext.getContext().getFactoryFinder()
> > >
> > > .getFactory(FactoryNames.COMPONENT_META_DATA_EXTRACTOR_FACTORY,
> > > ComponentMetaDataExtractorFactory.class)
> > >.create();
> > >}
> > >
> > >private void checkAndHandleRequiredAttribute(HtmlOutputLabel
> > > labelComp, String key) {
> > >
> > >if (NotNull.class.getName().equals(key)) {
> > >String label = (String) labelComp.getValue();
> > >if (!label.startsWith(REQUIRED_SYMBOL)) {
> > >
> > > labelComp.setValue(REQUIRED_SYMBOL+labelComp.getValue());
> > > }
> > > }
> > >}
> > > }
> > >
> > > A question to:
> > > >> e.g.: instead of using coreOutputLabel at:
> > > >> ExtValUtils.configureComponentWithMetaData(facesContext,
> > > >> coreOutputLabel, metaDataResult); you could use the targetComponent
> > > >> (= the input component). after this call you can check if the
> > > >> targetComponent is required.
> > >
> > > Does that mean after configuring the component's attribute 'required'
> > would
> > > be set? I didn't try that. Is there really a need for the component
> > > initialize and initiating the call via
> > > ExtValUtils.configureComponentWithMetaData()?
> > >
> > > For my already mentioned @RequiredExactlyOneOf cross validation
> > annotation
> > > (which works fine regarding validation), I managed to render all labels
> > > belonging to the specified attributes via the renderer interceptor. But
> > > this
> > > only works if the annotation is defined at the attribute that occurs
> > first
> > > in the html in order to manipulate the labels that are rendered later
> on.
> > > Possibly there would be a better solution to avoid this tight coupling
> by
> > > really using ExtVal's infrastructure!?
> > >
> > > Tom
> > >
> > >
> > >
> > > > -Ursprüngliche Nachricht-
> > > > Von: Gerhard Petracek [mailto:gerhard.petra...@gmail.com]
> > > > Gesendet: Dienstag, 27. April 2010 00:45
> > > > An: MyFaces Discussion
> > > > Betreff: Re: ExtVal: Rendering component with visual indication for
> > > > required fields
> > > >
> > > > hi thomas,
> > > >
> > > > basically you have 3 possibilities with extval:
> > > > - use simple but dynamic validation, jpa based validation and
> > > > cross-validation -> use extval-core + extval-property-validation (+
> > > > your
> > > > custom constraints)
> > > > - use bean-validation + some advanced extval mechanisms for it ->
> use
> > > > extval-core + extval-bean-validation + an impl. of bv (+ custom
> > > > bv-constraints)
> > > > - create your own validation module(s)/concepts -> use extval-core +
> > > > your
> > > > own mechanisms on top of it
> > > >
> > > > for sure you can combine all modules. you just have to take care that
> > > > you
> > > > don't mix different types of constraints and their concepts (esp. in
> > > > combination with extval add-ons). however, i would suggest that you
> > > > just use
> > > > one validation-module of extval. and as soon as you are using it for
> a
> > > > real
> > > > app, you should also think about tweaking it (e.g. see [1])
> > > >
> > > > two (simple) sample setups for extval + bv are available at [2] and
> > > > [3].
> > > > a nice intro is available at [4].
> > > >
> > > > regards,
> > > > gerhard
> > > >
> > > > [1]
> > http://wiki.apache.org/myfaces/Extensions/Validator/JSR303/Advanced
> > > > [2]
> > > >
> > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/exa
> > > > mples/hello_bean-validation/
> > > > [3]
> > > >
> > https://svn.apache.org/repos/asf/myfaces/extensions/validator/trunk/exa
> > > > mples/feature-set_02/
> > > > [4]
> > > >
> http://people.apache.org/~gpetracek/myfaces/extval/extval_chapter.html<http://people.apache.org/%7Egpetracek/myfaces/extval/extval_chapter.html>
> > <
> http://people.apache.org/%7Egpetracek/myfaces/extval/extval_chapter.html>
> > >
> > >
> >
>
Re: ExtVal: Rendering component with visual indication for required fields
also founded in the organization of the
> development
> > > > teams).
> > > >
> > > > This combination works perfect so far: validating the data according
> to
> > > the
> > > > annotations, transforming messages und even generating a html
> maxlength
> > > > attribute for @Size.max (nice!).
> > > >
> > > > Since I found it quite hard to understand how ExtVal is working in
> > detail
> > > > (even with your hints and links stated), I found a very simple
> solution
> > > > that
> > > > is working for me:
> > > > - I asked myself why do I need a renderer interceptor AND a component
> > > > initializer? From my point of view adding the '*' to the label text
> is
> > > more
> > > > a question of rendering the label's text. And I could not figure out
> > what
> > > > Rudy meant with "... and do the component initialization of this
> > > > EditableValueHolder" or what to do since I want to change the label
> not
> > > the
> > > > input component.
> > > > - By obmitting the component initializer, there is no need for meta
> > data
> > > > and
> > > > a transformer...
> > > > - I used some code I found in ExtVal classes, especially from
> > > ExtValUtils.
> > > >
> > > > So this is my simple (non standard?) solution which works for the
> > > @NotNull
> > > > annotation:
> > > >
> > > > public class RequiredLabelRendererInterceptor extends
> > > > AbstractRendererInterceptor {
> > > >
> > > >public static final String REQUIRED_SYMBOL = "*";
> > > >
> > > >@Override
> > > >public void beforeEncodeBegin(FacesContext facesContext,
> > > UIComponent
> > > > uiComponent, Renderer wrapped) throws IOException {
> > > >
> > > >if (uiComponent instanceof HtmlOutputLabel) {
> > > >
> > > >HtmlOutputLabel labelComp = (HtmlOutputLabel)
> > > > uiComponent;
> > > >UIComponent inputComp = ...; // find by label
> > > > attribute 'for'
> > > >
> > > >MetaDataExtractor extractor =
> > > > createMetaDataExtractor();
> > > >for (MetaDataEntry entry :
> > > > extractor.extract(facesContext, inputComp).getMetaDataEntries()) {
> > > >
> > > checkAndHandleRequiredAttribute(labelComp,
> > > > entry.getKey());
> > > >}
> > > >}
> > > >}
> > > >
> > > >private MetaDataExtractor createMetaDataExtractor() {
> > > > return ExtValContext.getContext().getFactoryFinder()
> > > >
> > > > .getFactory(FactoryNames.COMPONENT_META_DATA_EXTRACTOR_FACTORY,
> > > > ComponentMetaDataExtractorFactory.class)
> > > >.create();
> > > >}
> > > >
> > > >private void checkAndHandleRequiredAttribute(HtmlOutputLabel
> > > > labelComp, String key) {
> > > >
> > > >if (NotNull.class.getName().equals(key)) {
> > > >String label = (String) labelComp.getValue();
> > > >if (!label.startsWith(REQUIRED_SYMBOL)) {
> > > >
> > > > labelComp.setValue(REQUIRED_SYMBOL+labelComp.getValue());
> > > > }
> > > > }
> > > >}
> > > > }
> > > >
> > > > A question to:
> > > > >> e.g.: instead of using coreOutputLabel at:
> > > > >> ExtValUtils.configureComponentWithMetaData(facesContext,
> > > > >> coreOutputLabel, metaDataResult); you could use the
> targetComponent
> > > > >> (= the input component). after this call you can check if the
> > > > >> targetComponent is required.
> > > >
> > > > Does that mean after configuring the component's attribute 'required'
> > > would
> > > > be set? I didn't try that. Is there really a need for the component
> > > > initialize and initiating the call via
> > > > ExtValUtils.configureComponentWithMetaData()?
> > > >
> >
AW: ExtVal: Rendering component with visual indication for required fields
Hi Gerhard, hi Rudy, thanks for your explanation so far. MetaData, Transformers, Component Initializers and so on have become clear(er) to me now. Thanks for the coded add-on which covers some more aspects than I thought of (possibly EL expression in the labels value, etc.) and which is working for ExtVal based annotations. I changed my renderer only code to your example. Still I have to say as in a mail of mine before, this is NOT working for bean validation annotations since in ExtValUtils.getTransformedMetaDataWith() no meta data is extracted because a validation strategy class cannot be located through different naming conventions (like ' javax.validation.constraints.NotNull[Validation]Strategy'). Seems there is some configuration or mapping missing? I could not find any hints in Rudy's code. Only if I leave out the check for !metaDataResult.isEmpty() it is working, the setting of the attribute required is done in org.apache.myfaces.extensions.validator.beanval.HtmlCoreComponentsComponentI nitializer since the super call isComponentRequired(UIComponent) returns true what is not based on the annotations but on other component attributes like not being disabled nor being readonly. Can you took another look into this? Thank you. Tom > -Ursprüngliche Nachricht- > Von: Rudy De Busscher [mailto:rdebussc...@gmail.com] > Gesendet: Mittwoch, 28. April 2010 12:00 > An: MyFaces Discussion > Betreff: Re: ExtVal: Rendering component with visual indication for > required fields > > Tom, > > I quickly assembled the add-on I was thinking about a few months ago. > You > can find it here (1) > > If you check out the code and do a mvn install in the requiredLabel > directory, the add-on is locally available. > > You then can use it in your project by including following dependency > in > your POM. > > sandbox890.extensions.validator.addon > required-label > > 1.2.3-SNAPSHOT > > > It summarizes the discussions we had here how you could implement the > requirement of showing a marker. I did a quick test with the @Required > annotation and it works as expected. The Bean validation annotations > should > also work. > > (1) http://sandbox890.googlecode.com/svn/trunk/addons > > regards > Rudy. > > > On 28 April 2010 00:55, Gerhard Petracek > wrote: > > > hi tom, > > > > some additions: > > > > first of all: thx for your questions. such questions allow us to > improve > > the > > documentation! > > (+ usually there is a simple solution provided by extval and you > don't have > > to care about such extval internals.) > > > > @renderer interceptors: > > the concept allows extval to do all the magic it offers. however, > usually > > it's an internal concept. > > you just need it e.g. for add-ons (the label support you would like > to > > implement is such an add-on) > > > > *...@meta-data transformers* > > if you have custom constraints, you normally impl. a meta-data > transformer > > for each annotation you would like to use for component > initialization. > > *and that's it.* > > * > > * > > *(in case of bv it's a bit more difficult - e.g.: you have to care > about > > group validation, composite constraints,...).* > > * > > * > > you can transform information provided by concrete meta-data to a > generic > > representation. > > e.g. @Size (bv) and @Length (extval) provide the same information. so > you > > just have to impl. a transformer e.g. for @Size which extracts the > > information. > > as soon as you forward the extracted information to extval, the > framework > > does the rest (if it knows how to handle the provided information). > so you > > don't have to care about all the other details and internals. > > > > @component initialization (i just use trinidad as concrete example): > > you just have to impl. a component initializer e.g. for your > component lib > > if > > - you have (input) components which provide special features and the > > components aren't supported by extval (or an extval-add-on). > > - you have a new type of meta-data (e.g. if you would like to add a > > client-side validator for validating @EMail) > > > > e.g. trinidad offers client-side validation. so the optional trinidad > > module > > of extval uses the information provided by the transformers to add > > client-side validators and to set properties of the trinidad > components. so > > trinidad isn't aware of extal. it just gets plain (initialized) > trinida
Re: ExtVal: Rendering component with visual indication for required fields
hi tom, yes - the add-on i'll commit will also work with bv! regards, gerhard http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces 2010/4/28 Tom M. > Hi Gerhard, hi Rudy, > > thanks for your explanation so far. MetaData, Transformers, Component > Initializers and so on have become clear(er) to me now. > > Thanks for the coded add-on which covers some more aspects than I thought > of > (possibly EL expression in the label’s value, etc.) and which is working > for > ExtVal based annotations. I changed my renderer only code to your example. > > Still I have to say as in a mail of mine before, this is NOT working for > bean validation annotations since in > ExtValUtils.getTransformedMetaDataWith() no meta data is extracted because > a > validation strategy class cannot be located through different naming > conventions (like ' > javax.validation.constraints.NotNull[Validation]Strategy'). Seems there is > some configuration or mapping missing? I could not find any hints in Rudy's > code. > > Only if I leave out the check for !metaDataResult.isEmpty() it is working, > the setting of the attribute required is done in > > org.apache.myfaces.extensions.validator.beanval.HtmlCoreComponentsComponentI > nitializer since the super call isComponentRequired(UIComponent) returns > true what is not based on the annotations but on other component attributes > like not being disabled nor being readonly. > > Can you took another look into this? > > Thank you. > > Tom > > > > > -Ursprüngliche Nachricht- > > Von: Rudy De Busscher [mailto:rdebussc...@gmail.com] > > Gesendet: Mittwoch, 28. April 2010 12:00 > > An: MyFaces Discussion > > Betreff: Re: ExtVal: Rendering component with visual indication for > > required fields > > > > Tom, > > > > I quickly assembled the add-on I was thinking about a few months ago. > > You > > can find it here (1) > > > > If you check out the code and do a mvn install in the requiredLabel > > directory, the add-on is locally available. > > > > You then can use it in your project by including following dependency > > in > > your POM. > > > > sandbox890.extensions.validator.addon > > required-label > > > > 1.2.3-SNAPSHOT > > > > > > It summarizes the discussions we had here how you could implement the > > requirement of showing a marker. I did a quick test with the @Required > > annotation and it works as expected. The Bean validation annotations > > should > > also work. > > > > (1) http://sandbox890.googlecode.com/svn/trunk/addons > > > > regards > > Rudy. > > > > > > On 28 April 2010 00:55, Gerhard Petracek > > wrote: > > > > > hi tom, > > > > > > some additions: > > > > > > first of all: thx for your questions. such questions allow us to > > improve > > > the > > > documentation! > > > (+ usually there is a simple solution provided by extval and you > > don't have > > > to care about such extval internals.) > > > > > > @renderer interceptors: > > > the concept allows extval to do all the magic it offers. however, > > usually > > > it's an internal concept. > > > you just need it e.g. for add-ons (the label support you would like > > to > > > implement is such an add-on) > > > > > > *...@meta-data transformers* > > > if you have custom constraints, you normally impl. a meta-data > > transformer > > > for each annotation you would like to use for component > > initialization. > > > *and that's it.* > > > * > > > * > > > *(in case of bv it's a bit more difficult - e.g.: you have to care > > about > > > group validation, composite constraints,...).* > > > * > > > * > > > you can transform information provided by concrete meta-data to a > > generic > > > representation. > > > e.g. @Size (bv) and @Length (extval) provide the same information. so > > you > > > just have to impl. a transformer e.g. for @Size which extracts the > > > information. > > > as soon as you forward the extracted information to extval, the > > framework > > > does the rest (if it knows how to handle the provided information). > > so you > > > don't have to care about all the other details and int
Re: ExtVal: Rendering component with visual indication for required fields
hi, i committed the first versions of the add-ons at [1] and [2]. -> you are welcome to test it! regards, gerhard [1] http://code.google.com/p/os890/source/browse/#svn/trunk/java/web/jsf/extval/required_label [2] http://code.google.com/p/os890/source/browse/#svn/trunk/java/web/jsf/extval.bv/required_label http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces 2010/4/28 Gerhard Petracek > hi tom, > > yes - the add-on i'll commit will also work with bv! > > regards, > gerhard > > > http://www.irian.at > > Your JSF powerhouse - > JSF Consulting, Development and > Courses in English and German > > Professional Support for Apache MyFaces > > > > 2010/4/28 Tom M. > > Hi Gerhard, hi Rudy, >> >> thanks for your explanation so far. MetaData, Transformers, Component >> Initializers and so on have become clear(er) to me now. >> >> Thanks for the coded add-on which covers some more aspects than I thought >> of >> (possibly EL expression in the label’s value, etc.) and which is working >> for >> ExtVal based annotations. I changed my renderer only code to your example. >> >> Still I have to say as in a mail of mine before, this is NOT working for >> bean validation annotations since in >> ExtValUtils.getTransformedMetaDataWith() no meta data is extracted because >> a >> validation strategy class cannot be located through different naming >> conventions (like ' >> javax.validation.constraints.NotNull[Validation]Strategy'). Seems there is >> some configuration or mapping missing? I could not find any hints in >> Rudy's >> code. >> >> Only if I leave out the check for !metaDataResult.isEmpty() it is working, >> the setting of the attribute required is done in >> >> org.apache.myfaces.extensions.validator.beanval.HtmlCoreComponentsComponentI >> nitializer since the super call isComponentRequired(UIComponent) returns >> true what is not based on the annotations but on other component >> attributes >> like not being disabled nor being readonly. >> >> Can you took another look into this? >> >> Thank you. >> >> Tom >> >> >> >> > -Ursprüngliche Nachricht- >> > Von: Rudy De Busscher [mailto:rdebussc...@gmail.com] >> > Gesendet: Mittwoch, 28. April 2010 12:00 >> > An: MyFaces Discussion >> > Betreff: Re: ExtVal: Rendering component with visual indication for >> > required fields >> > >> > Tom, >> > >> > I quickly assembled the add-on I was thinking about a few months ago. >> > You >> > can find it here (1) >> > >> > If you check out the code and do a mvn install in the requiredLabel >> > directory, the add-on is locally available. >> > >> > You then can use it in your project by including following dependency >> > in >> > your POM. >> > >> > sandbox890.extensions.validator.addon >> > required-label >> > >> > 1.2.3-SNAPSHOT >> > >> > >> > It summarizes the discussions we had here how you could implement the >> > requirement of showing a marker. I did a quick test with the @Required >> > annotation and it works as expected. The Bean validation annotations >> > should >> > also work. >> > >> > (1) http://sandbox890.googlecode.com/svn/trunk/addons >> > >> > regards >> > Rudy. >> > >> > >> > On 28 April 2010 00:55, Gerhard Petracek >> > wrote: >> > >> > > hi tom, >> > > >> > > some additions: >> > > >> > > first of all: thx for your questions. such questions allow us to >> > improve >> > > the >> > > documentation! >> > > (+ usually there is a simple solution provided by extval and you >> > don't have >> > > to care about such extval internals.) >> > > >> > > @renderer interceptors: >> > > the concept allows extval to do all the magic it offers. however, >> > usually >> > > it's an internal concept. >> > > you just need it e.g. for add-ons (the label support you would like >> > to >> > > implement is such an add-on) >> > > >> > > *...@meta-data transformers* >> > > if you have custom constraints, you normally impl. a meta-data >> &
