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134 lines
No EOL
5.4 KiB
HTML
134 lines
No EOL
5.4 KiB
HTML
<!DOCTYPE html>
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<html lang='en'><head>
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<meta charset="utf-8" /><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
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<div data-role="page">
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<div data-role="header">
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<h1>.delegate()</h1>
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</div>
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<div data-role="content" data-theme="c" id="delegate1">
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<h2 class="jq-clearfix roundTop section-title">
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<span class="name">.delegate( selector, eventType, handler )</span> <span class="returns">Returns: <a class="return" href="http://docs.jquery.com/Types#jQuery">jQuery</a></span>
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</h2>
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<div class=" entry-details">
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<p class="desc"><strong>Description: </strong>Attach a handler to one or more events for all elements that match the selector, now or in the future, based on a specific set of root elements.</p>
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<ul class="signatures">
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<li class="signature" id="delegate-selector-eventType-handler">
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<h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.4.2/">1.4.2</a></span>.delegate( selector, eventType, handler )</h4>
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<p class="arguement"><strong>selector</strong>A selector to filter the elements that trigger the event.</p>
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<p class="arguement"><strong>eventType</strong>A string containing one or more space-separated JavaScript event types, such as "click" or "keydown," or custom event names.</p>
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<p class="arguement"><strong>handler</strong>A function to execute at the time the event is triggered.</p>
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</li>
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<li class="signature" id="delegate-selector-eventType-eventData-handler">
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<h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.4.2/">1.4.2</a></span>.delegate( selector, eventType, eventData, handler )</h4>
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<p class="arguement"><strong>selector</strong>A selector to filter the elements that trigger the event.</p>
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<p class="arguement"><strong>eventType</strong>A string containing one or more space-separated JavaScript event types, such as "click" or "keydown," or custom event names.</p>
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<p class="arguement"><strong>eventData</strong>A map of data that will be passed to the event handler.</p>
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<p class="arguement"><strong>handler</strong>A function to execute at the time the event is triggered.</p>
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</li>
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</ul>
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<div class="longdesc">
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<p>Delegate is an alternative to using the <a href="/live">.live()</a> method, allowing for each binding of event delegation to specific DOM elements. For example the following delegate code:</p>
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<pre>$("table").delegate("td", "hover", function(){
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$(this).toggleClass("hover");
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});</pre>
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<p>Is equivalent to the following code written using <code>.live()</code>:</p>
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<pre>$("table").each(function(){
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$("td", this).live("hover", function(){
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$(this).toggleClass("hover");
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});
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});</pre>
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<p>See also the <a href="/undelegate">.undelegate()</a> method for a way of removing event handlers added in <a href="/delegate">.delegate()</a>.</p>
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</div>
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<h3>Examples:</h3>
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<div id="entry-examples" class="entry-examples">
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<div id="example-0">
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<h4>Example: <span class="desc">Click a paragraph to add another. Note that .delegate() binds the click event to all paragraphs - even new ones.</span>
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</h4>
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<pre><code class="example demo-code"><!DOCTYPE html>
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<html>
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<head>
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<style>
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p { background:yellow; font-weight:bold; cursor:pointer;
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padding:5px; }
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p.over { background: #ccc; }
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span { color:red; }
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</style>
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<script src="http://code.jquery.com/jquery-latest.js"></script>
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</head>
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<body>
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<p>Click me!</p>
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<span></span>
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<script>
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$("body").delegate("p", "click", function(){
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$(this).after("<p>Another paragraph!</p>");
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});
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</script>
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</body>
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</html></code></pre>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div>
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<div id="example-1">
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<h4>Example: <span class="desc">To display each paragraph's text in an alert box whenever it is clicked:</span>
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</h4>
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<pre><code class="example">$("body").delegate("p", "click", function(){
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alert( $(this).text() );
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});</code></pre>
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</div>
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<div id="example-2">
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<h4>Example: <span class="desc">To cancel a default action and prevent it from bubbling up, return false:</span>
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</h4>
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<pre><code class="example">$("body").delegate("a", "click", function() { return false; })</code></pre>
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</div>
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<div id="example-3">
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<h4>Example: <span class="desc">To cancel only the default action by using the preventDefault method.</span>
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</h4>
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<pre><code class="example">$("body").delegate("a", "click", function(event){
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event.preventDefault();
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});</code></pre>
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</div>
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<div id="example-4">
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<h4>Example: <span class="desc">Can bind custom events too.</span>
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</h4>
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<pre><code class="example demo-code"><!DOCTYPE html>
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<html>
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<head>
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<style>
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p { color:red; }
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span { color:blue; }
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</style>
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<script src="http://code.jquery.com/jquery-latest.js"></script>
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</head>
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<body>
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<p>Has an attached custom event.</p>
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<button>Trigger custom event</button>
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<span style="display:none;"></span>
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<script>
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$("body").delegate("p", "myCustomEvent", function(e, myName, myValue){
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$(this).text("Hi there!");
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$("span").stop().css("opacity", 1)
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.text("myName = " + myName)
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.fadeIn(30).fadeOut(1000);
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});
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$("button").click(function () {
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$("p").trigger("myCustomEvent");
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});
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</script>
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</body>
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</html></code></pre>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</body></html> |