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POGXT Combobox with unselectable categories
 

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    <p>I am trying to do a ComboBox with <strong>options</strong> and <strong>categories</strong> in GXT 3.</p> <p>I can use a <code>ComboBoxCell</code> to have a different display for options and categories.</p> <p>Problem : I need the categories to be <strong>unselectable</strong> (like with HTML tag <code>&lt;optgroup&gt;</code>).</p> <p>Here is a plain old HTML comboBox (<code>&lt;select&gt; tag</code>)</p> <p><strong>HTML CODE:</strong></p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;/head&gt; &lt;body&gt; &lt;select&gt; &lt;optgroup label="category 1"&gt; &lt;option name="option1"&gt;Option 1&lt;/option&gt; &lt;option name="option2"&gt;Option 2&lt;/option&gt; &lt;option name="option3"&gt;Option 3&lt;/option&gt; &lt;/optgroup&gt; &lt;optgroup label="category 2"&gt; &lt;option name="option4"&gt;Option 4&lt;/option&gt; &lt;option name="option5"&gt;Option 5&lt;/option&gt; &lt;option name="option6"&gt;Option 6&lt;/option&gt; &lt;/optgroup&gt; &lt;/select&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>As you may see on <a href="http://jsfiddle.net/pgJQZ/" rel="nofollow">this fiddle</a>, it produces a ComboBox with <strong>unselectable</strong> categories. I am trying to do the equivalent with GXT.</p> <p>Any idea?</p> <p>EDIT:</p> <p>I finally did my own implementation : </p> <pre><code>import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Element; import com.google.gwt.user.client.ui.UIObject; import com.google.gwt.user.client.ui.Widget; import java.util.Collection; import java.util.HashMap; import java.util.HashSet; import java.util.Map; public class Select&lt;T&gt; extends Widget { private static final String TAG_OPTGROUP = "optgroup"; private static final String ATTR_NAME = "name"; private static final String PROPERTY_SELECTED = "selected"; private Element select; private Map&lt;Element, T&gt; mapElement; public Select(boolean multiple){ this.mapElement=new HashMap&lt;Element, T&gt;(); this.select = DOM.createSelect(multiple); this.setElement(this.select); } public Select(){ this(false); } public OptGroup addGroup(String displayName){ OptGroup optGroup=new OptGroup(displayName); this.select.appendChild(optGroup.getElement()); return optGroup; } public void addOption(T t,String displayName){ Element option=DOM.createOption(); option.setAttribute(ATTR_NAME,t.toString()); option.setInnerText(displayName); this.select.appendChild(option); this.mapElement.put(option,t); } public T getSelectedValue(){ for(Map.Entry&lt;Element,T&gt; entry:mapElement.entrySet()){ if(entry.getKey().getPropertyBoolean(PROPERTY_SELECTED)){ return entry.getValue(); } } return null; } public Collection&lt;T&gt; getSelectedValues(){ Collection&lt;T&gt; result=new HashSet&lt;T&gt;(); for(Map.Entry&lt;Element,T&gt; entry: mapElement.entrySet()){ if(entry.getKey().getPropertyBoolean(PROPERTY_SELECTED)){ result.add(entry.getValue()); } } return result; } public class OptGroup extends UIObject { private static final String ATTR_LABEL="label"; private String name; private Element element; private OptGroup(String name) { this.name = name; this.element = DOM.createElement(TAG_OPTGROUP); this.element.setAttribute(ATTR_LABEL,name); this.setElement(this.element); } public String getName() { return name; } public void addOption(T t,String displayName){ Element option=DOM.createOption(); option.setAttribute(ATTR_NAME,t.toString()); option.setInnerText(displayName); this.element.appendChild(option); mapElement.put(option,t); } } } </code></pre> <p>This is perfectible as I use <code>toString()</code> for the attribute <code>name</code> of the <code>&lt;option&gt;</code> tag but it meets my need ;)</p>
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