Is it possible to override renderer used by <h:selectOneRadio>? I tried to find the class from jsf-impl package of JSF 2.2 but didn't find it. The reason I want to do this is to get rid of the table it generates.
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Is it possible to override renderer used by h:selectOneRadio?
Yes, surely it is. Otherwise, UI component libraries like PrimeFaces couldn't exist.
I tried to find the class from jsf-impl package but didn't find it.
The exact class depends on the JSF implementation you're using. If it's Mojarra, then it's the com.sun.faces.renderkit.html_basic.RadioRenderer class. If it's MyFaces, then it's the org.apache.myfaces.renderkit.html.HtmlRadioRenderer class.
In order to properly override it, just extend the class and override methods where necessary and register it as follows in your faces-config.xml:
<render-kit>
<renderer>
<component-family>javax.faces.SelectOne</component-family>
<renderer-type>javax.faces.Radio</renderer-type>
<renderer-class>com.example.MyRadioRenderer</renderer-class>
</renderer>
</render-kit>
Keep in mind that you're this way tight-coupling the renderer to the specific JSF impl/version. Such an extended renderer is not compatible with a different JSF implementation (i.e. your app wouldn't deploy when you ever replace Mojarra by MyFaces) and may possibly break when the current JSF implementation has been updated to a newer version. If you worry about this, consider writing the renderer entirely from scratch, like PrimeFaces et.al. do.
The reason I want to do this is to get rid of the table it generates.
Consider looking at Tomahawk or PrimeFaces instead of reinventing the wheel. They have respectively a <t:selectOneRadio layout="spread"><t:radio> and <p:selectOneRadio layout="custom"><p:radioButton> which allows you positioning those things everywhere you want.
See also:
1
I added
<render-kit>
<renderer>
<component-family>javax.faces.SelectOne</component-family>
<renderer-type>javax.faces.Radio</renderer-type>
<renderer-class>com.sial.ecommerce.configurator.ui.model.RadioRendererWithoutDataTable</renderer-class>
</renderer>
</render-kit>
to faces-config.xml.
And created a class which extends com.sun.faces.renderkit.html_basic.RadioRenderer And I did override the method encodeEnd then commented out the code which adding table elements.
public class RadioRendererWithoutDataTable extends com.sun.faces.renderkit.html_basic.RadioRenderer {
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncode(component)) {
return;
}
ResponseWriter writer = context.getResponseWriter();
assert (writer != null);
String alignStr;
Object borderObj;
boolean alignVertical = false;
int border = 0;
if (null != (alignStr = (String) component.getAttributes().get("layout"))) {
alignVertical = alignStr.equalsIgnoreCase("pageDirection");
}
if (null != (borderObj = component.getAttributes().get("border"))) {
border = (Integer) borderObj;
}
Converter converter = null;
if (component instanceof ValueHolder) {
converter = ((ValueHolder) component).getConverter();
}
// renderBeginText(component, border, alignVertical, context, true);
Iterator<SelectItem> items = RenderKitUtils.getSelectItems(context, component);
Object currentSelections = getCurrentSelectedValues(component);
Object[] submittedValues = getSubmittedSelectedValues(component);
Map<String, Object> attributes = component.getAttributes();
OptionComponentInfo optionInfo = new OptionComponentInfo((String) attributes.get("disabledClass"),
(String) attributes.get("enabledClass"), (String) attributes.get("unselectedClass"),
(String) attributes.get("selectedClass"), Util.componentIsDisabled(component), isHideNoSelection(component));
int idx = -1;
while (items.hasNext()) {
SelectItem curItem = items.next();
idx++;
// If we come across a group of options, render them as a nested
// table.
if (curItem instanceof SelectItemGroup) {
// write out the label for the group.
if (curItem.getLabel() != null) {
// if (alignVertical) {
// writer.startElement("tr", component);
// }
//writer.startElement("td", component);
writer.writeText(curItem.getLabel(), component, "label");
// writer.endElement("td");
// if (alignVertical) {
// writer.endElement("tr");
// }
}
// if (alignVertical) {
// writer.startElement("tr", component);
// }
// writer.startElement("td", component);
// writer.writeText("\n", component, null);
// renderBeginText(component, 0, alignVertical, context, false);
// render options of this group.
SelectItem[] itemsArray = ((SelectItemGroup) curItem).getSelectItems();
for (int i = 0; i < itemsArray.length; ++i) {
renderOption(context, component, converter, itemsArray[i], currentSelections, submittedValues, alignVertical, i,
optionInfo);
}
// renderEndText(component, alignVertical, context);
// writer.endElement("td");
// if (alignVertical) {
// writer.endElement("tr");
// writer.writeText("\n", component, null);
// }
} else {
renderOption(context, component, converter, curItem, currentSelections, submittedValues, alignVertical, idx, optionInfo);
}
}
//renderEndText(component, alignVertical, context);
}
Then it worked for me.
When I given
<h:selectOneRadio >
<f:selectItem itemValue="1" itemLabel="Item 1" />
<f:selectItem itemValue="2" itemLabel="Item 2" />
</h:selectOneRadio>
in my jsf page.
It converted to
<input type="radio" name="bulkForm:j_idt224" id="bulkForm:j_idt224:0" value="1"><label for="bulkForm:j_idt224:0"> Item 1</label>
<input type="radio" name="bulkForm:j_idt224" id="bulkForm:j_idt224:1" value="2"><label for="bulkForm:j_idt224:1"> Item 2</label>
which was what I need.
Sujith PS
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