作为一种通用的方法,您可以自定义按钮呈现器,以便自动应用修复程序到您应用中的
所有(有资格的)按钮。
我使用此渲染器用于PrimeFaces的
p:commandButton
:
public class CommandButtonSingleClickRenderer extends CommandButtonRenderer {
@Override
protected void encodeMarkup(FacesContext context, CommandButton button) throws IOException {
if (isEligible(button)) {
final String widgetVar = button.resolveWidgetVar(context);
final String onClick = getAttributeValue(context, button, "onclick");
final String onComplete = getAttributeValue(context, button, "oncomplete");
button.setOnclick(prefix(onClick, getToggleJS(widgetVar, false)));
button.setOncomplete(prefix(onComplete, getToggleJS(widgetVar, true)));
}
super.encodeMarkup(context, button);
}
protected boolean isEligible(final CommandButton button) {
final ActionListener[] listeners = button.getActionListeners();
return button.isAjax()
&& button.isRendered()
&& (button.getActionExpression() != null || (listeners != null && listeners.length > 0))
&& !button.isDisabled()
&& !isConfirmation(button);
}
protected boolean isConfirmation(final CommandButton button) {
final String styleClass = button.getStyleClass();
return styleClass != null && styleClass.contains("ui-confirm");
}
protected String getToggleJS(final String widgetVar, final boolean enabled) {
return String.format("var w=PrimeFaces.widgets['%s'];if(w){w.%sable();};", widgetVar, enabled ? "en" : "dis");
}
protected String getAttributeValue(final FacesContext context, final CommandButton button, final String attribute) {
final ValueExpression ve = button.getValueExpression(attribute);
if (ve != null) {
return (String) ve.getValue(context.getELContext());
}
String key = attribute + "CommandButtonSingleClickRenderer";
String value = (String) button.getAttributes().get(key);
if (value == null) {
value = (String) button.getAttributes().get(attribute);
button.getAttributes().put(key, value == null ? Constants.EMPTY_STRING : value);
}
return value;
}
protected String prefix(final String base, final String prefix) {
return base == null ? prefix : prefix + base;
}
}
faces-config.xml:
<render-kit>
<renderer>
<component-family>org.primefaces.component</component-family>
<renderer-type>org.primefaces.component.CommandButtonRenderer</renderer-type>
<renderer-class>com.whatever.CommandButtonSingleClickRenderer</renderer-class>
</renderer>
</render-kit>
这个渲染器是在PrimeFaces Extensions 8.0中添加的。如果您正在使用PFE,您可以将此渲染器简单地添加到您的faces-config.xml render-kit
部分:
<renderer>
<component-family>org.primefaces.component</component-family>
<renderer-type>org.primefaces.component.CommandButtonRenderer</renderer-type>
<renderer-class>org.primefaces.extensions.renderer.CommandButtonSingleClickRenderer</renderer-class>
</renderer>
请查看https://www.primefaces.org/showcase-ext/sections/renderers/commandButtonSingleClick.jsf。