A JSF PhaseListener to Print the Component Tree (Example)
Have you ever wondered what the exact makeup of the server side JSF UI component tree in your page?
I was wondering the exact same thing, so I wrote a simple PhaseListener, that dumps the component tree to standard out.
The algorithm is a simple recursive printout of the entire component tree..
Here's the code:
package componentstuff; import java.util.ArrayList; import java.util.List; import javax.faces.component.UIComponent; import javax.faces.context.FacesContext; import javax.faces.event.PhaseEvent; import javax.faces.event.PhaseId; import javax.faces.event.PhaseListener; public class PrintComponentTree implements PhaseListener { public PrintComponentTree() { } public int indent = 0; public static final int INDENTSIZE = 2; public void beforePhase(PhaseEvent PhaseEvent) { } public void afterPhase(PhaseEvent PhaseEvent) { System.out.println(""); System.out.println("(Rendering Component Tree)"); printComponentTree(FacesContext.getCurrentInstance().getViewRoot()); } public PhaseId getPhaseId() { return PhaseId.RENDER_RESPONSE; } public void printComponentTree(UIComponent comp){ printComponentInfo(comp); List complist = (ArrayList)comp.getChildren(); if (complist.size()>0) indent++; for (int i = 0; i < complist.size(); i++) { UIComponent uicom = (UIComponent) complist.get(i); printComponentTree(uicom); if (i+1 == complist.size()) indent--; } } public void printComponentInfo(UIComponent comp){ if (comp.getId() == null){ System.out.println("UIViewRoot" + " " + "(" + comp.getClass().getName() + ")"); } else { printIndent(); System.out.println("|"); printIndent(); System.out.println(comp.getId() + " " + "(" + comp.getClass().getName() + ")"); } } public void printIndent(){ for (int i=0; i Also, don't forget to register it in your faces-config..componentstuff.PrintComponentTree Here's what the output looks like for a simple Faces page:06/03/03 17:26:39 (Rendering Component Tree) 06/03/03 17:26:39 UIViewRoot (javax.faces.component.UIViewRoot) 06/03/03 17:26:39 | 06/03/03 17:26:39 form1 (javax.faces.component.html.HtmlForm) 06/03/03 17:26:39 | 06/03/03 17:26:39 panelGrid1 (javax.faces.component.html.HtmlPanelGrid) 06/03/03 17:26:39 | 06/03/03 17:26:39 outputLabel1 (javax.faces.component.html.HtmlOutputLabel) 06/03/03 17:26:39 | 06/03/03 17:26:39 inputText1 (javax.faces.component.html.HtmlInputText) 06/03/03 17:26:39 | 06/03/03 17:26:39 outputLabel2 (javax.faces.component.html.HtmlOutputLabel) 06/03/03 17:26:39 | 06/03/03 17:26:39 inputSecret1 (javax.faces.component.html.HtmlInputSecret) 06/03/03 17:26:39 | 06/03/03 17:26:39 commandButton1 (javax.faces.component.html.HtmlCommandButton)Feel free to tweak the code however you like!
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