java - Component binding through MarkupWriter - Tapestry -


i'm in situation need use markupwriter create checkbox instead of using .tml. inside component , i'd bind checkbox's value parent's boolean value. in essence, it's following:

component

public class innercomponent {     @parameter     private boolean booleanvalue;      void afterrender(final markupwriter writer) {         writer.element("input", "type", "checkbox");         writer.end();     } }

calling page

public class outerpage {     @property     private boolean checkboxvalue;      @injectcomponent     private zone booleanzone;      object ondisplayboolean() {         return booleanzone.getbody();     } }

with .tml

<html t:type="layout" title="testproject index" xmlns:t="http://tapestry.apache.org/schema/tapestry_5_4.xsd">     <t:innercomponent booleanvalue='checkboxvalue'/><br/>      <t:eventlink event='displayboolean' zone='booleanzone'>update</t:eventlink>      <t:zone t:id='booleanzone' id='booleanzone'>         ${checkboxvalue}     </t:zone> </html>

the component's markupwriter writes out simple checkbox. receives boolean parameter. how go bind boolean parameter, checkbox markupwriter generates?

in simple example, checking checkbox , updating zone through eventlink should show updated value of parent's checkboxvalue boolean.

sifting through tapestry's source code, have found a solution. component should first of extend abstractfield , process submission of control. reassigning value updated one. edited, looks following:

public class innercomponent extends abstractfield {     @property     @parameter     private boolean booleanvalue;      @beginrender     void begin(final markupwriter writer) {         writer.element("input", "type", "checkbox",                 "name", getcontrolname(),                 "id", getclientid(),                 "checked", booleanvalue ? "checked" : null);         writer.end();     }      @override     protected void processsubmission(string controlname) {         string postedvalue = request.getparameter(controlname);         booleanvalue = postedvalue != null;     } }

this way i'm re-implementing checkbox logic. unlike in .tml, using existing tapestry checkbox component. if there's better solution, using existing checkbox component, i'd glad hear.


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