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https://github.com/Hopiu/jquery-mobile.git
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142 lines
No EOL
5.2 KiB
HTML
142 lines
No EOL
5.2 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>.parents()</h1>
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</div>
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<div data-role="content" data-theme="c" id="parents1">
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<h2 class="jq-clearfix roundTop section-title">
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<span class="name">.parents( [ 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 ancestors of each element in the current set of matched elements, optionally filtered by a selector.</p>
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<ul class="signatures"><li class="signature" id="parents-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>.parents( [ 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>.parents()</code> method allows us to search through the ancestors of these elements in the DOM tree and construct a new jQuery object from the matching elements. The <code>.parents()</code> and <code>.parent()</code> methods are similar, except that the latter only travels a single level up the DOM tree.</p>
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<p>The method optionally accepts a selector expression of the same type that we can pass to the <code>$()</code> function. If the selector is supplied, the elements will be filtered by testing whether they match it.</p>
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<p>Consider a page with a basic nested list on it:</p>
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<pre>
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<ul class="level-1">
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<li class="item-i">I</li>
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<li class="item-ii">II
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<ul class="level-2">
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<li class="item-a">A</li>
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<li class="item-b">B
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<ul class="level-3">
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<li class="item-1">1</li>
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<li class="item-2">2</li>
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<li class="item-3">3</li>
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</ul>
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</li>
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<li class="item-c">C</li>
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</ul>
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</li>
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<li class="item-iii">III</li>
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</ul>
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</pre>
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<p>If we begin at item A, we can find its ancestors:</p>
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<pre>$('li.item-a').parents().css('background-color', 'red');</pre>
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<p>The result of this call is a red background for the level-2 list, item II, and the level-1 list (and on up the DOM tree all the way to the <code><html></code> element). Since we do not supply a selector expression, all of the ancestors are part of the returned jQuery object. If we had supplied one, only the matching items among these would be included.</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">Find all parent elements of each b.</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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b, span, p, html body {
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padding: .5em;
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border: 1px solid;
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}
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b { color:blue; }
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strong { 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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<div>
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<p>
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<span>
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<b>My parents are: </b>
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</span>
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</p>
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</div>
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<script>
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var parentEls = $("b").parents()
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.map(function () {
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return this.tagName;
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})
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.get().join(", ");
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$("b").append("<strong>" + parentEls + "</strong>");
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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">Click to find all unique div parent elements of each 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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<style>
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p, div, span {margin:2px; padding:1px; }
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div { border:2px white solid; }
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span { cursor:pointer; font-size:12px; }
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.selected { color:blue; }
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b { color:red; display:block; font-size:14px; }
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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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<div>
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<div><span>Hello</span></div>
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<span>Hello Again</span>
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</div>
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<div>
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<span>And Hello Again</span>
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</div>
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</p>
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<b>Click Hellos to toggle their parents.</b>
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<script>
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function showParents() {
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$("div").css("border-color", "white");
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var len = $("span.selected")
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.parents("div")
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.css("border", "2px red solid")
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.length;
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$("b").text("Unique div parents: " + len);
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}
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$("span").click(function () {
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$(this).toggleClass("selected");
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showParents();
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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> |