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113 lines
No EOL
5 KiB
HTML
113 lines
No EOL
5 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>.find()</h1>
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</div>
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<div data-role="content" data-theme="c" id="find1">
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<h2 class="jq-clearfix roundTop section-title">
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<span class="name">.find( selector )</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>Get the descendants of each element in the current set of matched elements, filtered by a selector.</p>
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<ul class="signatures"><li class="signature" id="find-selector">
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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>.find( selector )</h4>
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<p class="arguement"><strong>selector</strong>A string containing a selector expression to match elements against.</p>
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</li></ul>
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<div class="longdesc">
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<p>Given a jQuery object that represents a set of DOM elements, the <code>.find()</code> method allows us to search through the descendants of these elements in the DOM tree and construct a new jQuery object from the matching elements. The <code>.find()</code> and <code>.children()</code> methods are similar, except that the latter only travels a single level down the DOM tree.</p>
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<p>The method accepts a selector expression of the same type that we can pass to the $() function. The elements will be filtered by testing whether they match this selector.</p>
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<p>Consider a page with a basic nested list on it:</p>
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<pre>
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<ul class="level-1">
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<li class="item-i">I</li>
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<li class="item-ii">II
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<ul class="level-2">
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<li class="item-a">A</li>
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<li class="item-b">B
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<ul class="level-3">
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<li class="item-1">1</li>
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<li class="item-2">2</li>
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<li class="item-3">3</li>
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</ul>
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</li>
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<li class="item-c">C</li>
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</ul>
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</li>
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<li class="item-iii">III</li>
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</ul>
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</pre>
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<p>If we begin at item II, we can find list items within it:</p>
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<pre>$('li.item-ii').find('li').css('background-color', 'red');</pre>
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<p>The result of this call is a red background on items A, B, 1, 2, 3, and C. Even though item II matches the selector expression, it is not included in the results; only descendants are considered candidates for the match.</p>
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<p>As discussed in “The jQuery Factory Function” section above, selector context is implemented with the <code>.find()</code> <code>method;</code> therefore, <code>$('li.item-ii').find('li')</code> is equivalent to <code>$('li', 'li.item-ii')</code>.</p>
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<blckquote>Unlike in the rest of the tree traversal methods, the selector expression is required in a call to <code>.find()</code>. If we need to retrieve all of the descendant elements, we can pass in the universal selector <code>'*'</code> to accomplish this.</blckquote>
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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">Starts with all paragraphs and searches for descendant span elements, same as $("p span")</span>
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</h4>
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<pre><code class="example demo-code"><!DOCTYPE html>
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<html>
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<head>
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<script src="http://code.jquery.com/jquery-latest.js"></script>
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</head>
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<body>
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<p><span>Hello</span>, how are you?</p>
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<p>Me? I'm <span>good</span>.</p>
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<script>$("p").find("span").css('color','red');</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">Add spans around each word then add a hover and italicize words with the letter t.</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 { font-size:20px; width:200px; cursor:default;
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color:blue; font-weight:bold; margin:0 10px; }
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.hilite { background:yellow; }
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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>
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When the day is short
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find that which matters to you
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or stop believing
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</p>
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<script>
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var newText = $("p").text().split(" ").join("</span> <span>");
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newText = "<span>" + newText + "</span>";
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$("p").html(newText)
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.find('span')
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.hover(function () { $(this).addClass("hilite"); },
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function () { $(this).removeClass("hilite"); })
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.end()
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.find(":contains('t')")
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.css({"font-style":"italic", "font-weight":"bolder"});
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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> |