Correction: putting the @Script solved the null pointer but the generated javascript was incorrect. I had to put it before the end of the Form. You were right Andreas
Ivano Luberti ha scritto: > I have wrote the solution I have found before reading this. > Actually It was enough to put it after the form. > The null component was the text field component not the Form. > You almost got it because sure the position of @Script matters. > > It seems that getForm returns something even if the form has already > been rendered. > > Andreas Andreou ha scritto: > >> You don't specify which object you've found to be null... but anyway, let >> me try... >> >> looking at the FormFocus.script code from >> http://tapestry.apache.org/tapestry4.1/components/general/script.html >> i see ${component.form.name} and ${component.name}, so either >> component or component.form is null (according to the error message) >> >> Looking at the javadocs for AbstractFormComponent >> http://tapestry.apache.org/tapestry4.1/apidocs/org/apache/tapestry/form/AbstractFormComponent.html >> I read >> getForm() : returns the IForm which contains the component, or null if >> the component is >> not contained by a form, or if the containing Form is not currently >> rendering. >> >> Finally, looking at your code I see that @Script is outside the @Form, >> so according >> to the javadocs, getForm() should indeed return null ! >> >> The cure? move the @Script inside @Form - or rewrite the script so that it >> doesn't use getForm() perhaps... >> >> On Wed, Dec 30, 2009 at 23:35, Ivano Luberti <lube...@archicoop.it> wrote: >> >> >>> Thanks Andreas , the problem is that everything works until I insert the >>> javascript. >>> In fact the exception is thrown inside the Script implementation. Down >>> here you'll find the init part of the srtack trace. >>> I was wondering if not using the @Body in the component html template is >>> correct, given the fact that it is used in the html template of the page >>> that call the component. >>> >>> >>> >>> >>> * ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2203) >>> * ognl.ASTProperty.getValueBody(ASTProperty.java:114) >>> * ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) >>> * ognl.SimpleNode.getValue(SimpleNode.java:258) >>> * ognl.ASTChain.getValueBody(ASTChain.java:141) >>> * ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) >>> * ognl.SimpleNode.getValue(SimpleNode.java:258) >>> * ognl.Ognl.getValue(Ognl.java:494) >>> * ognl.Ognl.getValue(Ognl.java:458) >>> * >>> org.apache.tapestry.services.impl.ExpressionEvaluatorImpl.readCompiled(ExpressionEvaluatorImpl.java:123) >>> >>> * >>> org.apache.tapestry.services.impl.ExpressionEvaluatorImpl.read(ExpressionEvaluatorImpl.java:112) >>> >>> * >>> $ExpressionEvaluator_125e178e557.read($ExpressionEvaluator_125e178e557.java) >>> >>> * >>> org.apache.tapestry.script.ScriptSessionImpl.evaluate(ScriptSessionImpl.java:86) >>> >>> * >>> org.apache.tapestry.script.AbstractToken.evaluate(AbstractToken.java:84) >>> >>> * org.apache.tapestry.script.InsertToken.write(InsertToken.java:48) >>> * >>> org.apache.tapestry.script.AbstractToken.writeChildren(AbstractToken.java:71) >>> >>> * org.apache.tapestry.script.LetToken.write(LetToken.java:53) >>> * >>> org.apache.tapestry.script.AbstractToken.writeChildren(AbstractToken.java:71) >>> >>> * org.apache.tapestry.script.ParsedScript.execute(ParsedScript.java:82) >>> * org.apache.tapestry.html.Script.renderComponent(Script.java:159) >>> * >>> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724) >>> >>> * >>> org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187) >>> >>> * >>> org.apache.tapestry.BaseComponent.renderComponent(BaseComponent.java:107) >>> >>> * >>> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724) >>> >>> * >>> org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187) >>> >>> * >>> org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:538) >>> >>> * org.apache.tapestry.html.Body.renderComponent(Body.java:38) >>> >>> >>> Andreas Andreou ha scritto: >>> >>> >>>> Hi, >>>> The error message says that something.getName() is trying to get evaluated >>>> but >>>> something is null >>>> >>>> Finding where exactly the error is thrown will show you which object is >>>> null... >>>> >>>> On Wed, Dec 30, 2009 at 20:51, Ivano Luberti <lube...@archicoop.it> wrote: >>>> >>>> >>>> >>>>> Hello, I'm trying to include some simple javascript in a component in my >>>>> T4 application. >>>>> I want my only textfield to get focus when is displayed. >>>>> I'm following the instructions provided at: >>>>> >>>>> http://tapestry.apache.org/tapestry4.1/components/general/script.html >>>>> >>>>> The template of the page including the component has @Shell and @Body >>>>> specified. >>>>> My component looks like this: >>>>> >>>>> <html> >>>>> <head> >>>>> <title>MET Online</title> >>>>> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> >>>>> <link href="css/stile_palmare.css" rel="stylesheet" type="text/css"> >>>>> </head> >>>>> <body> >>>>> <span jwcid="@Script" >>>>> script="/it/archimede/met/metgestioneingressi/tapestry/scripts/FormFocus.script" >>>>> component="ognl:components.barCode"/> >>>>> >>>>> <div id="box_operazione"> >>>>> <h1>Lettura BarCode</h1> >>>>> <br /> >>>>> <h2>passare il barcode sotto il lettore ottico</h2> >>>>> <form method="post" action="" jwcid="barCodeForm"> >>>>> <input type="text" jwcid="barCode" class="text_box" value="" /> >>>>> <br /><br /> >>>>> <input type="submit" name="Submit" value="Submit" class="bottone"> >>>>> </form> >>>>> </div> >>>>> >>>>> </body> >>>>> </html> >>>>> >>>>> The Script template file is the last one provides at: >>>>> >>>>> http://tapestry.apache.org/tapestry4.1/components/general/script.html >>>>> >>>>> the one without CDATA >>>>> >>>>> When I try to display the page I get: >>>>> >>>>> [ +/- ] Exception: Unable to read OGNL expression '<parsed OGNL >>>>> expression>' of >>>>> {component=$textfield_...@81eb97c1[homeloggeduser/barCodeForm.barCode]}: >>>>> source is null for getProperty(null, "name") >>>>> >>>>> I have already tried putting a bad component name in the @Script span >>>>> and the error changes, so it seem the name is right. I have put a bad >>>>> path to the script file and the error changes , then the path is correct. >>>>> >>>>> Can someone point me in the right direction? >>>>> >>>>> >>>>> >>>>> -- >>>>> ================================================== >>>>> dott. Ivano Mario Luberti >>>>> Archimede Informatica societa' cooperativa a r. l. >>>>> Sede Operativa >>>>> Via Gereschi 36 - 56126- Pisa >>>>> tel.: +39-050- 580959 >>>>> tel/fax: +39-050-9711344 >>>>> web: www.archicoop.it >>>>> ================================================== >>>>> >>>>> >>>>> --------------------------------------------------------------------- >>>>> To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org >>>>> For additional commands, e-mail: users-h...@tapestry.apache.org >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>> -- >>> ================================================== >>> dott. Ivano Mario Luberti >>> Archimede Informatica societa' cooperativa a r. l. >>> Sede Operativa >>> Via Gereschi 36 - 56126- Pisa >>> tel.: +39-050- 580959 >>> tel/fax: +39-050-9711344 >>> web: www.archicoop.it >>> ================================================== >>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org >>> For additional commands, e-mail: users-h...@tapestry.apache.org >>> >>> >>> >>> >> >> >> > > -- ================================================== dott. Ivano Mario Luberti Archimede Informatica societa' cooperativa a r. l. Sede Operativa Via Gereschi 36 - 56126- Pisa tel.: +39-050- 580959 tel/fax: +39-050-9711344 web: www.archicoop.it ================================================== --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org For additional commands, e-mail: users-h...@tapestry.apache.org
