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POWicket : how to set checked value in CheckBoxMultipleChoice
 

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    <p>I am using wicket's CheckBoxMultipleChoice to let the user set a list of options. so far it works fine. but then i want to add a "check all" check box that checks all the options in the CheckBoxMultipleChoice and I am having problems with that.</p> <p>here is my initial code</p> <pre><code>ArrayList&lt;String&gt; chosen; List&lt;String&gt; choices = Arrays.asList(new String[]{"Train", "Bus", "Car"}); CheckBoxMultipleChoice myCheck = new CheckBoxMultipleChoice("transport", new Model(chosen), choices)); myCheck.setOutputMarkupId(true); form.add(myCheck); </code></pre> <p>on submit i print out the values of chosen and its "Bus", "Car" etc. as expected.</p> <p>now i am adding a checkbox to check all the choices using ajax:</p> <pre><code>Boolean checkOrNot; final CheckBox checkAll = new CheckBox("checkAll", new Model(checkOrNot)); form.add(checkAll); checkAll.add(new AjaxFormComponentUpdatingBehavior("onchange") { @Override protected void onUpdate(AjaxRequestTarget target) { // here i am not able to set the checkboxes // i tried doing this chosen.clear(); chosen.add(new String("Car")); chosen.add(new String("Train")); myCheck.modelChanged(); // i have also tried recreating the multiple choice myCheck = new CheckBoxMultipleChoice&lt;T&gt;("transport", new Model(chosen), choices); myCheck.setOutputMarkupId(true); target.addComponent(myCgecj); target.addComponent(form); } }); </code></pre> <p>I am running out of ideas and wondering if anyone has any solutions? thanks in advance for any help.</p>
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