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Facelet debug Tag

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Facelet debug Tag is useful in displaying the component tree and scoped variables.

Facelet debug Tag

        

This tag is useful in displaying the component tree and scoped variables. This information will be displayed in a popup window of browser when we press Ctrl+Shift+(a key). This key will be specified in hotkey attribute. For example, in the code below in "debugtemplate.xhtml", this has been specified "p". So when page comes to the user then if Ctrl+Shift+p is pressed, debug window is open which displays the component tree and scoped variables.
 


debug.xhtml : 
 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:ui="http://java.sun.com/jsf/facelets"
  xmlns:h="http://java.sun.com/jsf/html">
<body>
  Content above composition tag will not be rendered.
   <ui:composition template="/pages/debug/debugtemplate.xhtml">
   <ui:define name="face1">
   <center><h2>RoseIndia Facelet Tags Tutorial</h2></center>
   <h3>Welcome to the Facelet world..........</h3>
  </ui:define>
  <ui:define name="face2">Enter UserID :<br/>
   <h:inputText id="it" /><br/><br/>
   </ui:define>
   <ui:define name="face3">Enter Password :<br/>
   <h:inputSecret id="is" /><br/><br/>
   </ui:define>
  <ui:define name="face4">
   <h:commandButton id="cb" value="Submit" />
  </ui:define>
   </ui:composition>
   Content below composition tag will not be rendered.
</body>
</html>

 debugtemplate.xhtml :

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:ui="http://java.sun.com/jsf/facelets">
<head>
   <title>facelet example </title>
  <link href="../../style/CSS.css" rel="stylesheet" type="text/css"/>
</head>
<body> 
  <ui:insert name="face1"> </ui:insert>
  <ui:insert name="face2"> </ui:insert>
  <ui:insert name="face3"> </ui:insert>
  <ui:insert name="face4"> </ui:insert>
  <ui:debug hotkey="p" rendered="true"/>
</body>
</html>

 Rendered Output : This is the page that is displayed to the user first. Now if we press Ctrl+Shift+p then debug window is opened that is shown in the second figure below :

debug window :

Html Source Code :

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
   <title>facelet example </title>
   <link href="../../style/CSS.css" rel="stylesheet" type="text/css" />
</head>
<body>
   <center><h2>RoseIndia Facelet Tags Tutorial</h2></center>
   <h3>Welcome to the Facelet world..........</h3>
   Enter UserID :<br /><input id="it" type="text" name="it" /><br /><br />
   Enter Password :<br /><input id="is" type="password" 
   name="is" value="" /><br /><br />
  <input id="cb" type="submit" name="cb" value="Submit" />
  <script language="javascript" type="text/javascript">

  //<![CDATA[
function faceletsDebug(URL) { day = new Date(); id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "',   'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=800,height=600,left = 240,top = 212');"); };var faceletsOrigKeyup = document.onkeyup; document.onkeyup = function(e) { if (window.event) e = window.event; if (String.fromCharCode(e.keyCode) == 'P' & e.shiftKey & e.ctrlKey) faceletsDebug('/facelettag/pages/debug/debug.jsf?facelets.ui.DebugOutput=1179482643961'); else if (faceletsOrigKeyup) faceletsOrigKeyup(e); };
//]]>
</script>
</body>
</html>

This tag contains only one attribute :

hotkey : This attribute is used to specify the key which is to be pressed with Ctrl+Shift to open a debug window. Its default value is "d". It doesn't take EL expression.

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Posted on: June 18, 2007

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