但对我来说最好的解决方案是支持自动对焦(以及我可能希望在我的应用程序中支持的任何其他可能类型的属性,这些属性尚未定义).
我见过Adding custom attribute (HTML5) support to JSF 2.0 UIInput component,但这似乎适用于基本的JSF组件,并不适用于PrimeFaces组件.
如何扩展Primefaces的组件/渲染以支持此功能？
解决方法
RenderKit而不是为每个单个组件自定义渲染器,其中您提供自定义
ResponseWriter,其中重写
startElement()方法以检查元素名称和/或组件实例,然后相应地编写其他属性.
这是HTML5渲染工具包的启动示例：
public class Html5RenderKit extends RenderKitWrapper {
private RenderKit wrapped;
public Html5RenderKit(RenderKit wrapped) {
this.wrapped = wrapped;
}
@Override
public ResponseWriter createResponseWriter(Writer writer,String contentTypeList,String characterEncoding) {
return new Html5ResponseWriter(super.createResponseWriter(writer,contentTypeList,characterEncoding));
}
@Override
public RenderKit getWrapped() {
return wrapped;
}
}
HTML5响应编写器：
public class Html5ResponseWriter extends ResponseWriterWrapper {
private static final String[] HTML5_INPUT_ATTRIBUTES = { "autofocus" };
private ResponseWriter wrapped;
public Html5ResponseWriter(ResponseWriter wrapped) {
this.wrapped = wrapped;
}
@Override
public ResponseWriter cloneWithWriter(Writer writer) {
return new Html5ResponseWriter(super.cloneWithWriter(writer));
}
@Override
public void startElement(String name,UIComponent component) throws IOException {
super.startElement(name,component);
if ("input".equals(name)) {
for (String attributeName : HTML5_INPUT_ATTRIBUTES) {
String attributeValue = component.getAttributes().get(attributeName);
if (attributeValue != null) {
super.writeAttribute(attributeName,attributeValue,null);
}
}
}
}
@Override
public ResponseWriter getWrapped() {
return wrapped;
}
}
要使其运行,请创建此HTML5渲染工具包工厂：
public class Html5RenderKitFactory extends RenderKitFactory {
private RenderKitFactory wrapped;
public Html5RenderKitFactory(RenderKitFactory wrapped) {
this.wrapped = wrapped;
}
@Override
public void addRenderKit(String renderKitId,RenderKit renderKit) {
wrapped.addRenderKit(renderKitId,renderKit);
}
@Override
public RenderKit getRenderKit(FacesContext context,String renderKitId) {
RenderKit renderKit = wrapped.getRenderKit(context,renderKitId);
return (HTML_BASIC_RENDER_KIT.equals(renderKitId)) ? new Html5RenderKit(renderKit) : renderKit;
}
@Override
public Iterator<String> getRenderKitIds() {
return wrapped.getRenderKitIds();
}
}
并在faces-config.xml中将其注册如下：
<factory>
<render-kit-factory>com.example.Html5RenderKitFactory</render-kit-factory>
</factory>
JSF实用程序库OmniFaces也有这样的渲染工具包,Html5RenderKit(source code here)理论上也应该在PrimeFaces组件上正常工作.然而,这个问题迫使我再次重新审视,我很尴尬地看到ResponseWriter#startElement()中的组件参数在< p：inputText>中为null. (参见line 74 of InputTextRenderer,它应该是writer.startElement(“input”,inputText)).我不确定这是有意还是对PrimeFaces渲染器的设计进行疏忽,但你可以使用UIComponent#getCurrentComponent()来获取它.
更新：OmniFaces 1.5中已修复此问题.
值得注意的是,即将推出的JSF 2.2将支持通过新的passthrough命名空间或< f：passthroughAttribute>在视图中定义自定义属性.标签.另见What’s new in JSF 2.2? – HTML5 Pass-through attributes.
因此,所以：
<html ... xmlns:p="http://java.sun.com/jsf/passthrough"> ... <h:inputText ... p:autofocus="true" />
(您可能希望使用而不是p作为名称空间前缀来避免与PrimeFaces的默认名称空间冲突)
要么：
<h:inputText ...>
<f:passthroughAttribute name="autofocus" value="true" />
</h:inputText>