// 编写处理Action事件的方法
public void processAction(ActionEvent event) {
// 获取当前的FacesContext对象
FacesContext context = FacesContext.getCurrentInstance();
// 获取JSF页面中<f:view.../>元素
UIViewRoot viewRoot = context.getViewRoot();
// 通过ID获取<f:view.../>内的<h:form.../>子元素。
UIComponent comp = viewRoot.findComponent("addForm");
// 通过ID获取<h:form.../>内的第一个<h:inputText.../>子元素。
UIInput input = (UIInput) comp.findComponent("name");
// 通过ID获取<h:form.../>内的第二个<h:inputText.../>子元素。
HtmlInputText price = (HtmlInputText) comp.findComponent("price");
if (input.getValue().equals("疯狂Java讲义")) {
price.setSize(60);
price.setValue("99.0元");
price.setStyle("background-color:#9999ff;" + "font-weight:bold");
}
}
@SuppressWarnings({"UnusedDeclaration"})
protected UIComponent findReparentedComponent(
FaceletContext ctx, UIComponent parent, String tagId) {
UIComponent facet = parent.getFacets().get(UIComponent.COMPOSITE_FACET_NAME);
if (facet != null) {
UIComponent newParent = facet.findComponent((String) parent.getAttributes().get(tagId));
if (newParent != null) return ComponentSupport.findChildByTagId(newParent, tagId);
}
return null;
}
public static String findClientIds(String ids, UIComponent component, FacesContext context)
throws IOException {
if (ids == null) return null;
StringBuilder clientIds = new StringBuilder();
String[] idlist = ids.split("[\\s]");
for (String id : idlist) {
if (!id.startsWith("@")) {
UIComponent found = component.findComponent(id);
if (found != null) {
if (clientIds.length() > 0) clientIds.append(" ");
clientIds.append(found.getClientId(context));
} else {
throw new IOException("Cannot find id " + id + " within components NamingContainer");
}
}
}
return clientIds.toString();
}
@SuppressWarnings("unchecked")
public void showCake(ActionEvent event) {
UIComponent root = FacesContext.getCurrentInstance().getViewRoot();
UIPanel cake = (UIPanel) root.findComponent("cake");
cake.setRendered(true);
List cakeParts = cake.getChildren();
cakeParts.clear();
HtmlGraphicImage cakeLeftSide = new HtmlGraphicImage();
cakeLeftSide.setUrl("images/cake_left.gif");
cakeParts.add(cakeLeftSide);
for (int i = 0; i < userAge; i++) {
HtmlGraphicImage candle = new HtmlGraphicImage();
candle.setUrl("images/candle_on.gif");
cakeParts.add(candle);
}
HtmlGraphicImage cakeRightSide = new HtmlGraphicImage();
cakeRightSide.setUrl("images/cake_right.gif");
cakeParts.add(cakeRightSide);
}
public void clearCake() {
UIComponent root = FacesContext.getCurrentInstance().getViewRoot();
UIPanel cake = (UIPanel) root.findComponent("cake");
cake.setRendered(false);
cake.getChildren().clear();
}
public static String findClientIds(FacesContext context, UIComponent component, String list) {
if (list == null) return "@none";
// System.out.println("ComponentUtils.findClientIds() component.clientId: " +
// component.getClientId(context) + " list: " + list);
String[] ids = list.split("[,\\s]+");
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < ids.length; i++) {
if (i != 0) buffer.append(" ");
String id = ids[i].trim();
// System.out.println("ComponentUtils.findClientIds() ["+i+"] id: " + id);
if (id.equals("@all") || id.equals("@none")) {
// System.out.println("ComponentUtils.findClientIds() ["+i+"] " + id);
buffer.append(id);
} else if (id.equals("@this")) {
// System.out.println("ComponentUtils.findClientIds() ["+i+"] @this : " +
// component.getClientId(context));
buffer.append(component.getClientId(context));
} else if (id.equals("@parent")) {
// System.out.println("ComponentUtils.findClientIds() ["+i+"] @parent: " +
// component.getParent().getClientId(context));
buffer.append(component.getParent().getClientId(context));
} else if (id.equals("@form")) {
UIComponent form = ComponentUtils.findParentForm(context, component);
if (form == null)
throw new FacesException(
"Component " + component.getClientId(context) + " needs to be enclosed in a form");
buffer.append(form.getClientId(context));
} else {
UIComponent comp = component.findComponent(id);
// For portlets, if the standard search doesn't work, it may be necessary to do an absolute
// search
// which requires including the portlet's namespace. So the resulting encoded id looks
// something
// like portletNamespace:container:componentId. We make the search absolute by pre-pending
// a leading colon (:).
if (comp == null) {
String encodedId = encodeNameSpace(context, id);
if (!encodedId.startsWith(":")) {
encodedId = ":" + encodedId;
}
comp = component.findComponent(encodedId);
// System.out.println("ComponentUtils.findClientIds() ["+i+"] comp
// : " + (comp == null ? "null" : comp.getClientId(context)) + " id: " + encodedId);
}
if (comp != null) {
buffer.append(comp.getClientId(context));
} else {
if (context.getApplication().getProjectStage().equals(ProjectStage.Development)) {
logger.log(Level.INFO, "Cannot find component with identifier \"{0}\" in view.", id);
}
buffer.append(id);
}
}
}
return buffer.toString();
}