我已经编写（好了，修改过）基于this article出现在数据表中的单选按钮的自定义组件。我通过使用@FacesRenderer和@FacesComponent标记并省略了自定义标记类，对JSF 2.2稍作修改。在我的XHTML页面中一切正常
xmlns:custom="http://mynamespace"
...
<h:dataTable id="mySampleTable3"
value="#{myBackingBean.sampleTable3}"
var="item"
width="100%"
border="1"
first="0">
<f:facet name="header">
<h:panelGrid id="gridHeader3" columns="2" width="100%" >
<h:outputText id="outputText3"
value="Radios grouped in row(With our custom tag)"/>
</h:panelGrid>
</f:facet>
<h:column>
<f:facet name="header">
<h:outputText value="Emp Name" />
</f:facet>
<h:outputText id="empName" value="#{item.empName}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Excellent" />
</f:facet>
<custom:customradio id="myRadioId2"
name="myRadioRow"
value="#{item.radAns}"
itemValue="E" />
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Good" />
</f:facet>
<custom:customradio id="myRadioId3"
name="myRadioRow"
value="#{item.radAns}"
itemValue="G" />
</h:column>
...
</h:dataTable>
并且单选按钮的数据表正常工作（它们按行分组）。当我动态使用此组件时会出现问题。所以我有
HtmlPanelGrid radioGrid = (HtmlPanelGrid) getApplication()
.createComponent(HtmlPanelGrid.COMPONENT_TYPE);
...
UICustomSelectOneRadio customSelectOneRadio = (UICustomSelectOneRadio) getApplication().
createComponent(UICustomSelectOneRadio.COMPONENT_TYPE);
customSelectOneRadio.setId("rb_" + question.getQuestionId() + "_" + row + "_" + col);
customSelectOneRadio.setName("myRadioRow");
String binding = "#{" + beanName + "." + propName +
"[\"" + question.getQuestionId().toString() + "_" +
subQuestion.getId() + "\"]}";
ValueExpression ve = getExpressionFactory().
createValueExpression(getELContext(), binding, String.class);
customSelectOneRadio.setValueExpression("value", ve);
customSelectOneRadio.setItemValue(value);
radioGrid.getChildren().add(customSelectOneRadio);
不幸的是，尽管渲染了数据表，但单选按钮并不是。出现空白列。我想知道是否有人知道是否有一些方法我应该覆盖我的渲染器。我看起来像：
@FacesRenderer(componentFamily = UICustomSelectOneRadio.COMPONENT_FAMILY, rendererType = HTMLCustomSelectOneRadioRenderer.RENDERER_TYPE)
public class HTMLCustomSelectOneRadioRenderer extends Renderer {
public static final String RENDERER_TYPE = "com.myapp.jsf.renderers.HTMLCustomSelectOneRadioRenderer";
@Override
public void decode(FacesContext context, UIComponent component) {
if ((context == null) || (component == null)) {
throw new NullPointerException();
}
UICustomSelectOneRadio customSelectOneRadio;
if (component instanceof UICustomSelectOneRadio) {
customSelectOneRadio = (UICustomSelectOneRadio) component;
} else {
return;
}
Map map = context.getExternalContext().getRequestParameterMap();
String name = getName(customSelectOneRadio, context);
if (map.containsKey(name)) {
String value = (String) map.get(name);
if (value != null) {
setSubmittedValue(component, value);
}
}
}
private void setSubmittedValue(UIComponent component, Object obj) {
if (component instanceof UIInput) {
((UIInput) component).setSubmittedValue(obj);
}
}
private String getName(UICustomSelectOneRadio customSelectOneRadio,
FacesContext context) {
UIComponent parentUIComponent
= getParentDataTableFromHierarchy(customSelectOneRadio);
if (parentUIComponent == null) {
return customSelectOneRadio.getClientId(context);
} else {
if (customSelectOneRadio.getOverrideName() != null
&& customSelectOneRadio.getOverrideName().equals("true")) {
return customSelectOneRadio.getName();
} else {
String id = customSelectOneRadio.getClientId(context);
int lastIndexOfColon = id.lastIndexOf(":");
String partName = "";
if (lastIndexOfColon != -1) {
partName = id.substring(0, lastIndexOfColon + 1);
if (customSelectOneRadio.getName() == null) {
partName = partName + "generatedRad";
} else {
partName = partName + customSelectOneRadio.getName();
}
}
return partName;
}
}
}
private UIComponent getParentDataTableFromHierarchy(UIComponent uiComponent) {
if (uiComponent == null) {
return null;
}
if (uiComponent instanceof UIData) {
return uiComponent;
} else {
//try to find recursively in the Component tree hierarchy
return getParentDataTableFromHierarchy(uiComponent.getParent());
}
}
@Override
public void encodeEnd(FacesContext context, UIComponent component)
throws IOException {
if ((context == null) || (component == null)) {
throw new NullPointerException();
}
UICustomSelectOneRadio customSelectOneRadio
= (UICustomSelectOneRadio) component;
if (component.isRendered()) {
ResponseWriter writer = context.getResponseWriter();
writer.startElement("input", component);
writer.writeAttribute("type", "radio", "type");
writer.writeAttribute("id", component.getClientId(context), "id");
writer.writeAttribute("name", getName(customSelectOneRadio, context), "name");
if (customSelectOneRadio.getStyleClass() != null && customSelectOneRadio.getStyleClass().trim().
length() > 0) {
writer.writeAttribute("class", customSelectOneRadio.getStyleClass().trim(), "class");
}
if (customSelectOneRadio.getStyle() != null && customSelectOneRadio.getStyle().trim().length() > 0) {
writer.writeAttribute("style", customSelectOneRadio.getStyle().trim(), "style");
}
...
if (customSelectOneRadio.getValue() != null
&& customSelectOneRadio.getValue().equals(customSelectOneRadio.getItemValue())) {
writer.writeAttribute("checked", "checked", "checked");
}
if (customSelectOneRadio.getItemLabel() != null) {
writer.write(customSelectOneRadio.getItemLabel());
}
writer.endElement("input");
}
}
}
为了快速总结，当我在facelets / XHTML文件中使用自定义标记时，这是有效的，但是当我动态使用它时，这种方法就不行了，例如。
<h:panelGroup id="dynamicPanel" layout="block" binding="#{documentController.dynamicPanel}"/>
如果有人对我可能遗失的内容有任何想法，我将不胜感激。
答案 0 :(得分：0)
疑难杂症！这一切都围绕着改变rendererType属性。从上面的Renderer类中，你可以看到我将它设置为我自己的，即
public static final String RENDERER_TYPE = "com.myapp.jsf.renderers.HTMLCustomSelectOneRadioRenderer";
（1）我将其更改为
public static final String RENDERER_TYPE = "javax.faces.Radio";
（2）我还更改了xxx.taglib.xml文件以反映这一点，例如
<namespace>http://mycomponents</namespace>
<tag>
<tag-name>customradio</tag-name>
<component>
<component-type>CustomRadio</component-type>
<renderer-type>javax.faces.Radio</renderer-type> /*<----- See Here */
</component>
</tag>
（3）但是，这是最后一步。我还必须在UICustomSelectOneRadio组件中创建以下构造函数。没有这个也行不通。
public UICustomSelectOneRadio() {
this.setRendererType("javax.faces.Radio");
}
请记住 - 我从UIInput扩展了我的组件，因此javax.faces.Text已经设置好了。将我的component family留作“CustomRadio”很好。
我对渲染器类型等仍然不是很满意，但对于想要一点信息的人来说， BalusC 很好地解释了它here。