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    <h2>Client-sided solution (Javascript)</h2> <p>You could save an Ajax call and gain responsiveness by coding that behavior client-side. In the simplest of the scenarios, if you can give those checkboxes a fixed "id" attribute, you could use <code>Component.setMarkupId()</code> to force an <code>id</code> value for the checks (make sure it is unique in the DOM): </p> <p><strong>Java</strong></p> <pre><code>add(new CheckBox("1").setOutputMarkupId(true).setMarkupId("check1"); add(new CheckBox("2").setOutputMarkupId(true).setMarkupId("check2"); add(new CheckBox("3").setOutputMarkupId(true).setMarkupId("check3"); </code></pre> <p><strong>HTML</strong></p> <pre><code>&lt;input type="checkbox" wicket:id="1" onclick="uncheck(this,1)"/&gt; &lt;input type="checkbox" wicket:id="2" onclick="uncheck(this,2)"/&gt; &lt;input type="checkbox" wicket:id="3" onclick="uncheck(this,3)"/&gt; </code></pre> <p><strong>Javascript</strong></p> <pre><code>function uncheck(comp, idx){ if (comp.checked) { if (idx == 1){ document.getElementById("check2").checked = false; document.getElementById("check3").checked = false; } else if (idx == 2 || idx == 3){ document.getElementById("check1").checked = false; } } } ​ </code></pre> <hr> <h2>Java only solution (Ajax)</h2> <p>If you really want to do this server-side, it would make sense to also propagate the values server side (instead of relying on which component was last focused), for instance with <code>AjaxFormComponentUpdatingBehavior</code>.</p> <pre><code> final CheckBox c1 = new CheckBox("on"); final CheckBox c2 = new CheckBox("off"); c1.setOutputMarkupId(true); c2.setOutputMarkupId(true); c1.add(new AjaxFormComponentUpdatingBehavior("onclick") { private static final long serialVersionUID = 1L; protected void onUpdate(final AjaxRequestTarget target) { if (Boolean.TRUE.equals(c1.getModelObject())) { c2.setModelObject(Boolean.FALSE); target.add(c2); } } }); c2.add(new AjaxFormComponentUpdatingBehavior("onclick") { private static final long serialVersionUID = 1L; protected void onUpdate(final AjaxRequestTarget target) { if (Boolean.TRUE.equals(c2.getModelObject())) { c1.setModelObject(Boolean.FALSE); target.add(c1); } } }); add(c1); add(c2); </code></pre> <p>If this constraint is important for the integrity of your data model, you should also implement it in a <code>FormValidator</code> so that invalid input never reaches the <code>Form</code>'s <code>Model</code>s. Users without JS enabled or just fiddling with the DOM could bypass it (the same would apply if using an Ajax Behavior).</p>
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    1. POHow to unselect checkbox in chrome browser
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    1. COhm nice example. I dont use this because I dont know js. I just know java and wicket
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    2. COAdded an example on how to do it with Ajax (no JS-coding involved). However, I'd go for the client-sided solution; including a JS function in a page is quite easy, and you can even do it from Wicket (see `HeaderContributor`s)
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    3. COnice example but I try it and it doesnt work too !!. First your code is not compiled and you are using deprecated method like target.addComponent(c1);. Secondly when I correct your code doesnt work on chrome too
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