Also, if you would like to put the logic to determine if a component should display or not in that component, you can have your SetupRender or BeginRender phases return a boolean result -- if it returns the false, the component will not be rendered (no matter where that component is placed). For example:
Page template: <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";> <head> <title>Conditionally render a component</title> </head> <body> <t:myConditionalDisplayComponent /> </body> </html> Component template: <div xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";> I've been displayed! </div> Component class: package org.example.myapp.components; import org.apache.tapestry.MarkupWriter; import org.apache.tapestry.annotations.BeginRender; import org.example.myapp.services.DetermineSomeCondition; public class MyConditionalDisplayComponent { private someCondition; @BeginRender boolean beginRender() { someCondition = DetermineSomeCondition.determine(); return (someCondition == true); } } Daniel Jue wrote: > > Hi, I would try blocks of components at the end of your template, and > a delegate component. > > The delegate refers to a method in your page or component class the > template it for. It returns an Object, which is actually one of the > component blocks. It can also return null and nothing will be rendered > where the delegate tag was. > > Alternatively, you could wrap a section of code in an If component. > > > > For instance, to delegate: > > <div xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";> > <tr> > <td><t:selectdaterangetype /></td> > </tr> > <tr> > <td><t:delegate to="typeOfDateRange" /></td> > </tr> > > <t:block> > <t:selectmonth /> > <t:selectmonthrange /> > <t:selectquarter /> > <t:selectquarterrange /> > </t:block></div> > > > -------------------------------- > The java: > > @Component(id = "daterangetypeSelector") > private SelectDateRangeType selectdaterangetype; > > @Component > private SelectMonth selectmonth; > > @Component > private SelectMonthRange selectmonthrange; > > @Component > private SelectQuarter selectquarter; > > @Component > private SelectQuarterRange selectquarterrange; > > public Object getTypeOfDateRange() { > DateRangeType drt = selectdaterangetype.getSelected(); > if (drt.equals(DateRangeTypeEnum.DR_ENTIRE_FISCAL_YEAR)) { > return null; > } else if (drt.equals(DateRangeTypeEnum.DR_MONTH_SINGLE)) { > return selectmonth; > } else if (drt.equals(DateRangeTypeEnum.DR_MONTH_RANGE)) { > return selectmonthrange; > } else if (drt.equals(DateRangeTypeEnum.DR_QUARTER_SINGLE)) { > return selectquarter; > } else { > logger.debug("getTypeOfDateRange() DRT is unknown to > me, drt=" > + drt.toDisplay()); > return null; > } > } > > > > > > On 8/3/07, Janko Muzykant <[EMAIL PROTECTED]> wrote: >> >> hello, i would like to omit some part of my page eg. allow only one >> component >> to be written in output. i did it writing my own MarkupWriter with >> enable/disable function which when enabled works as standard writer and >> when >> disabled ignores all writings. It's initially disabled and only specific >> component toggles the flag to write out its body. It works, but having in >> mind all the flexibility of tapestry 5 i bet there is much better way to >> do >> the same thing. Could you enlighten me a bit and suggest better solution? >> >> thanks, >> jm. >> >> -- >> View this message in context: >> http://www.nabble.com/T5-Best-way-to-omit-part-of-result-page-in-output-tf4211016.html#a11978648 >> Sent from the Tapestry - User mailing list archive at Nabble.com. >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- View this message in context: http://www.nabble.com/T5-Best-way-to-omit-part-of-result-page-in-output-tf4211016.html#a11986632 Sent from the Tapestry - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
