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<!DOCTYPE html>
<html lang='en'><head><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
<div class="entry-content">
<div class="entry-title roundTop">
<h1 class="jq-clearfix">.width()</h1>
<div class="entry-meta jq-clearfix">
Categories:
<span class="category"><a href="http://api.jquery.com/category/css/" title="View all posts in CSS">CSS</a></span> | <span class="category"><a href="http://api.jquery.com/category/dimensions/" title="View all posts in Dimensions">Dimensions</a></span> | <span class="category"><a href="http://api.jquery.com/category/manipulation/" title="View all posts in Manipulation">Manipulation</a> > <a href="http://api.jquery.com/category/manipulation/style-properties/" title="View all posts in Style Properties">Style Properties</a></span>
</div>
</div>
<div class="toc">
<h4><span>Contents:</span></h4>
<ul class="toc-list">
<li>
<a href="#width1">width() </a><ul><li>.width()
</li></ul>
</li>
<li>
<a href="#width2">width( value ) </a><ul>
<li>.width( value )
</li>
<li>.width( function(index, width) )
</li>
</ul>
</li>
</ul>
</div>
<div id="width1" class="entry method">
<h2 class="jq-clearfix roundTop section-title">
<span class="name">.width()</span> <span class="returns">Returns: <a class="return" href="http://api.jquery.com/Types/#Integer">Integer</a></span>
</h2>
<div class="jq-box roundBottom entry-details">
<p class="desc"><strong>Description: </strong>Get the current computed width for the first element in the set of matched elements.</p>
<ul class="signatures"><li class="signature" id="width"><h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.0/">1.0</a></span>.width()</h4></li></ul>
<div class="longdesc">
<p>The difference between <code>.css(width)</code> and <code>.width()</code> is that the latter returns a unit-less pixel value (for example, <code>400</code>) while the former returns a value with units intact (for example, <code>400px</code>). The <code>.width()</code> method is recommended when an element's width needs to be used in a mathematical calculation.</p>
<p class="image"><img src="/images/0042_04_04.png"></p>
<p>This method is also able to find the width of the window and document.</p>
<pre>$(window).width(); // returns width of browser viewport
$(document).width(); // returns width of HTML document</pre>
<p>Note that <code>.width()</code> will always return the content width, regardless of the value of the CSS <code>box-sizing</code> property.</p>
</div>
<h3>Example:</h3>
<div class="entry-examples" id="entry-examples"><div id="example-0">
<h4><span class="desc">Show various widths. Note the values are from the iframe so might be smaller than you expected. The yellow highlight shows the iframe body.</span></h4>
<pre class="prettyprint"><code class="example demo-code"><!DOCTYPE html>
<html>
<head>
<style>
body { background:yellow; }
button { font-size:12px; margin:2px; }
p { width:150px; border:1px red solid; }
div { color:red; font-weight:bold; }
</style>
<script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
</head>
<body>
<button id="getp">Get Paragraph Width</button>
<button id="getd">Get Document Width</button>
<button id="getw">Get Window Width</button>
<div>&nbsp;</div>
<p>
Sample paragraph to test width
</p>
<script>
function showWidth(ele, w) {
$("div").text("The width for the " + ele +
" is " + w + "px.");
}
$("#getp").click(function () {
showWidth("paragraph", $("p").width());
});
$("#getd").click(function () {
showWidth("document", $(document).width());
});
$("#getw").click(function () {
showWidth("window", $(window).width());
});
</script>
</body>
</html></code></pre>
<h4>Demo:</h4>
<div class="demo code-demo"></div>
</div></div>
</div>
</div>
<div id="width2" class="entry method">
<h2 class="jq-clearfix roundTop section-title">
<span class="name">.width( value )</span> <span class="returns">Returns: <a class="return" href="http://api.jquery.com/Types/#jQuery">jQuery</a></span>
</h2>
<div class="jq-box roundBottom entry-details">
<p class="desc"><strong>Description: </strong>Set the CSS width of each element in the set of matched elements.</p>
<ul class="signatures">
<li class="signature" id="width-value">
<h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.0/">1.0</a></span>.width( value )</h4>
<p class="arguement"><strong>value</strong>An integer representing the number of pixels, or an integer along with an optional unit of measure appended (as a string).</p>
</li>
<li class="signature" id="width-functionindex- width">
<h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.4.1/">1.4.1</a></span>.width( function(index, width) )</h4>
<p class="arguement"><strong>function(index, width)</strong>A function returning the width to set. Receives the index position of the element in the set and the old width as arguments. Within the function, <code>this</code> refers to the current element in the set.</p>
</li>
</ul>
<div class="longdesc">
<p>When calling <code>.width('value')</code>, the value can be either a string (number and unit) or a number. If only a number is provided for the value, jQuery assumes a pixel unit. If a string is provided, however, any valid CSS measurement may be used for the width (such as <code>100px</code>, <code>50%</code>, or <code>auto</code>). Note that in modern browsers, the CSS width property does not include padding, border, or margin, unless the <code>box-sizing</code> CSS property is used.</p>
<p>If no explicit unit was specified (like 'em' or '%') then "px" is concatenated to the value.</p>
<p>Note that <code>.width('value')</code> sets the width of the box in accordance with the CSS <code>box-sizing</code> property. Changing this property to <code>border-box</code> will cause this function to change the outerWidth of the box instead of the content width.</p>
</div>
<h3>Example:</h3>
<div class="entry-examples" id="entry-examples-1"><div id="example-1-0">
<h4><span class="desc">To set the width of each div on click to 30px plus a color change.</span></h4>
<pre class="prettyprint"><code class="example demo-code"><!DOCTYPE html>
<html>
<head>
<style>
div { width:70px; height:50px; float:left; margin:5px;
background:red; cursor:pointer; }
</style>
<script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
</head>
<body>
<div></div>
<div>d</div>
<div>d</div>
<div>d</div>
<div>d</div>
<script>
$("div").one('click', function () {
$(this).width(30)
.css({cursor:"auto", "background-color":"blue"});
});
</script>
</body>
</html></code></pre>
<h4>Demo:</h4>
<div class="demo code-demo"></div>
</div></div>
</div>
</div>
</div>
</body></html>
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