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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<head>
<title>YUI Library Examples: Logger Control: Using LogWriter</title>
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#container {position:static;float:right;margin:1em;}
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<script type="text/javascript">
//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
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<div id="pagetitle"><h1>YUI Library Examples: Logger Control: Using LogWriter</h1></div>
</div>
<div id="bd">
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<div class="yui-ge">
<div class="yui-u first example">
<div class="promo">
<h1>Logger Control: Using LogWriter</h1>
<div class="exampleIntro">
<p>Using LogWriter.</p>
</div>
<div class="example-container module ">
<div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<div id="container"></div>
<div id="content">
<h4>Example: Log messages into different categories</h4>
<p>By default, unsourced log messages get assigned to a "global" bucket.</p>
<ul>
<li><a href="#" class="global info">Log an "info" message.</a></li>
<li><a href="#" class="global warn">Log a "warn" message.</a></li>
<li><a href="#" class="global error">Log an "error" message.</a></li>
<li><a href="#" class="global time">Log a "time" message.</a></li>
</ul>
<h4>Example: Log messages into different categories and assign them
to a source called <code>myBucket</code></h4>
<p>You can assign a source to a log message by passing it in as
the third argument to <code>YAHOO.log()</code>.</p>
<ul>
<li><a href="#" class="myBucket info">Log an "info" message.</a></li>
<li><a href="#" class="myBucket warn">Log a "warn" message.</a></li>
<li><a href="#" class="myBucket error">Log an "error" message.</a></li>
<li><a href="#" class="myBucket time">Log a "time" message.</a></li>
</ul>
<h4>Example: Create a LogWriter to write log messages from a class
named <code>MyClass</code></h4>
<p>If you plan to assign many log messages to the same source (such
as from a class), it may be easier to write log messages from a
LogWriter instance.</p>
<ul>
<li><a href="#" class="MyClass info">Log an "info" message.</a></li>
<li><a href="#" class="MyClass warn">Log a "warn" message.</a></li>
<li><a href="#" class="MyClass error">Log an "error" message.</a></li>
<li><a href="#" class="MyClass time">Log a "time" message.</a></li>
</ul>
</div>
<script type="text/javascript">
YAHOO.util.Event.addListener(window, "load", function() {
YAHOO.example.LogWriter = new function() {
this.myLogReader = new YAHOO.widget.LogReader("container");
this.myLogWriter = new YAHOO.widget.LogWriter("MyClass");
// Click to log
this.clickToLog = function(e) {
YAHOO.util.Event.stopEvent(e);
var target = YAHOO.util.Event.getTarget(e);
var source = (YAHOO.util.Dom.hasClass(target, "MyClass")) ? "MyClass" : null;
if(!source) {
source = (YAHOO.util.Dom.hasClass(target, "myBucket")) ? "myBucket" : null;
if(YAHOO.util.Dom.hasClass(target, "info")) {
YAHOO.log("This is an \"info\" message.", "info", source);
}
else if(YAHOO.util.Dom.hasClass(target, "warn")) {
YAHOO.log("This is a \"warn\" message.", "warn", source);
}
else if(YAHOO.util.Dom.hasClass(target, "error")) {
YAHOO.log("This is an \"error\" message.", "error", source);
}
else if(YAHOO.util.Dom.hasClass(target, "time")) {
YAHOO.log("This is a \"time\" message.", "time", source);
}
}
else {
if(YAHOO.util.Dom.hasClass(target, "info")) {
this.myLogWriter.log("This is an \"info\" message.", "info");
}
else if(YAHOO.util.Dom.hasClass(target, "warn")) {
this.myLogWriter.log("This is a \"warn\" message.", "warn");
}
else if(YAHOO.util.Dom.hasClass(target, "error")) {
this.myLogWriter.log("This is an \"error\" message.", "error");
}
else if(YAHOO.util.Dom.hasClass(target, "time")) {
this.myLogWriter.log("This is a \"time\" message.", "time");
}
}
};
YAHOO.util.Event.addListener(YAHOO.util.Dom.get("content"),"click",this.clickToLog, this, true);
};
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<h2 class="first">Sample Code for this Example</h2>
<p>CSS:</p>
<textarea name="code" class="CSS" cols="60" rows="1">/* custom styles for this example */
#container {position:relative;float:right;margin:1em;}
#container .mytype {background-color:#FF99CC;}
</textarea>
<p>Markup:</p>
<textarea name="code" class="HTML" cols="60" rows="1"><div id="container"></div>
</textarea>
<p>JavaScript:</p>
<textarea name="code" class="JScript" cols="60" rows="1">YAHOO.example.LogWriter = new function() {
this.myLogReader = new YAHOO.widget.LogReader("container");
this.myLogWriter = new YAHOO.widget.LogWriter("MyClass");
// Generate logs
YAHOO.log("This is an info message.", "info", source);
YAHOO.log("This is a warn message.", "warn", source);
YAHOO.log("This is an error message.", "error", source);
YAHOO.log("This is a time message.", "time", source);
this.myLogWriter.log("This is an info message.", "info");
this.myLogWriter.log("This is a warn message.", "warn");
this.myLogWriter.log("This is an error message.", "error");
this.myLogWriter.log("This is a time message.", "time");
};
</textarea>
<h2>Configuration for This Example</h2>
<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?dragdrop&logger&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
</div>
<div class="yui-u">
<div id="examples">
<h3 class='firstContent'>Logger Control Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../logger/log_basic.html'>Basic Logging</a></li><li><a href='../logger/log_reading.html'>Configuring LogReader</a></li><li class='selected'><a href='../logger/log_writing.html'>Using LogWriter</a></li><li><a href='../logger/log_autocomplete.html'>Logger Integration with YUI Components</a></li><li><a href='../logger/log_skinning.html'>Skinning Model</a></li><li><a href='../layout/adv_layout.html'>Complex Application (included with examples for Layout Manager)</a></li> </ul>
</div>
</div>
<div id="module">
<h3>More Logger Control Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/logger/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_logger.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/logger.pdf">Cheat Sheet PDF</a> (external)</li></ul>
</div>
</div>
</div>
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