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Editor: LeonardLu
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<<BR>>Check [[Tapestry5SubmitContext5105Source|here]] for a version based on the Tapestry5.1 Submit component

This is especially useful in loops, where the component name is dynamic.

To use it, add this to your page template:

<input t:type="SubmitContext" t:id="theSubmit" t:context="idString"/>

add this to your page class:

void onSelectedFromTheSubmit(String idString)
    // do something based on idString

(Modified from T5.0.4. Put it into yourapp.components package. Updated to work with 5.0.12 by 9902468.)
Check here for a version based on the Tapestry5.1 Submit component

// Copyright 2007 The Apache Software Foundation
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

package yourapp.components;

import org.apache.tapestry.ComponentResources;
import org.apache.tapestry.MarkupWriter;
import org.apache.tapestry.annotations.Environmental;
import org.apache.tapestry.annotations.Inject;
import org.apache.tapestry.annotations.Parameter;
import org.apache.tapestry.corelib.base.AbstractField;
import org.apache.tapestry.services.FormSupport;
import org.apache.tapestry.services.Heartbeat;
import org.apache.tapestry.services.Request;

  * Corresponds to &lt;input type="submit"&gt;, a client-side element that can force the
  * enclosing form to submit. The submit responsible for the form submission will post a
  * notification that allows the application to know that it was the responsible entity. The
  * notification is named "selected" and has a String context.
public final class SubmitContext extends AbstractField
     static final String SELECTED_EVENT = "selected";

      * If true, then any notification sent by the component will be deferred until the end of
      * the form submission (this is usually desirable).
     private boolean _defer = true;

     private String _context;

     private FormSupport _formSupport;

     private Heartbeat _heartbeat;

     private ComponentResources _resources;

     private Request _request;

     public SubmitContext()

     SubmitContext(Request request)
         _request = request;

     void beginRender(MarkupWriter writer)
         // write a hidden input for the context
         //String elementName = getElementName();
         String elementName = getControlName(); //Modified to work with 5.0.12
         writer.element("input", "type", "hidden", "name", elementName + "X", "value", _context);

         // now the submit
         writer.element("input", "type", "submit", "name", elementName, "id", getClientId());

     void afterRender(MarkupWriter writer)
     //protected void processSubmission(FormSupport formSupport, String elementName)
     protected void processSubmission(String elementName) //Modified to work with 5.0.12
         String value = _request.getParameter(elementName);
         final String context = _request.getParameter(elementName + "X");

         if (value == null)

         Runnable sendNotification = new Runnable()
             public void run()
                 _resources.triggerEvent(SELECTED_EVENT, new Object[] {context}, null);

         // When not deferred, don't wait, fire the event now (actually, at the end of the current
         // heartbeat). This is most likely because the Submit is inside a Loop and some contextual
         // information will change if we defer. Another option might be to wait until the next
         // heartbeak?

         if (_defer)


     // For testing:

     void setDefer(boolean defer)
         _defer = defer;

     void setup(ComponentResources resources, FormSupport support, Heartbeat heartbeat)
         _resources = resources;
         _formSupport = support;
         _heartbeat = heartbeat;

Tapestry5SubmitContextComponent (last edited 2009-12-10 23:53:26 by LeonardLu)