mirror of
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99 lines
No EOL
4.7 KiB
HTML
99 lines
No EOL
4.7 KiB
HTML
<!DOCTYPE html>
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<html lang='en'><head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, minimum-scale=1, maximum-scale=1"><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>.focus()</h1>
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</div>
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<div data-role="content" data-theme="c" id="focus1">
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<h2 class="jq-clearfix roundTop section-title">
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<span class="name">.focus( handler(eventObject) )</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>Bind an event handler to the "focus" JavaScript event, or trigger that event on an element.</p>
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<ul class="signatures">
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<li class="signature" id="focus-handlereventObject">
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<h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.0/">1.0</a></span>.focus( handler(eventObject) )</h4>
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<p class="arguement"><strong>handler(eventObject)</strong>A function to execute each time the event is triggered.</p>
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</li>
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<li class="signature" id="focus"><h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.0/">1.0</a></span>.focus()</h4></li>
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</ul>
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<div class="longdesc">
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<ul>
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<li>This method is a shortcut for <code>.bind('focus', handler)</code> in the first variation, and <code>.trigger('focus')</code> in the second.</li>
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<li>The <code>focus</code> event is sent to an element when it gains focus. This event is implicitly applicable to a limited set of elements, such as form elements (<code><input></code>, <code><select></code>, etc.) and links (<code><a href></code>). In recent browser versions, the event can be extended to include all element types by explicitly setting the element's <code>tabindex</code> property. An element can gain focus via keyboard commands, such as the Tab key, or by mouse clicks on the element.</li>
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<li>Elements with focus are usually highlighted in some way by the browser, for example with a dotted line surrounding the element. The focus is used to determine which element is the first to receive keyboard-related events.</li>
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</ul>
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<p>For example, consider the HTML:</p>
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<pre><form>
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<input id="target" type="text" value="Field 1" />
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<input type="text" value="Field 2" />
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</form>
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<div id="other">
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Trigger the handler
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</div>
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</pre>
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<p>The event handler can be bound to the first input field:</p>
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<pre>$('#target').focus(function() {
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alert('Handler for .focus() called.');
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});</pre>
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<p>Now if we click on the first field, or tab to it from another field, the alert is displayed:</p>
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<p><span class="output">Handler for .focus() called.</span></p>
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<p>We can trigger the event when another element is clicked:</p>
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<pre>$('#other').click(function() {
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$('#target').focus();
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});</pre>
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<p>After this code executes, clicks on <span class="output">Trigger the handler</span> will also alert the message.</p>
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<p>The <code>focus</code> event does not bubble in Internet Explorer. Therefore, scripts that rely on event delegation with the <code>focus</code> event will not work consistently across browsers.</p>
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<blockquote><p>Triggering the focus on hidden elements causes an error in Internet Explorer. Take care to only call <code>.focus()</code> without parameters on elements that are visible.</p></blockquote>
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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">Fire focus.</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>span {display:none;}</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><input type="text" /> <span>focus fire</span></p>
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<p><input type="password" /> <span>focus fire</span></p>
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<script>
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$("input").focus(function () {
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$(this).next("span").css('display','inline').fadeOut(1000);
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});
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</script>
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</body>
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</html></code></pre>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div>
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<div id="example-1">
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<h4>Example: <span class="desc">To stop people from writing in text input boxes, try:</span>
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</h4>
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<pre><code class="example">$("input[type=text]").focus(function(){
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$(this).blur();
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});</code></pre>
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</div>
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<div id="example-2">
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<h4>Example: <span class="desc">To focus on a login input box with id 'login' on page startup, try:</span>
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</h4>
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<pre><code class="example">$(document).ready(function(){
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$("#login").focus();
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});</code></pre>
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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> |