JS uses the getComputedStyle() method to obtain CSS attribute values

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JS uses the getComputedStyle() method to obtain CSS attribute values_javascript tips
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May 16, 2016 pm 04:51 PM
In the process of debugging web pages, js is often used to obtain the CSS style of elements. There are many methods. Now I only summarize the methods I often use as follows:

1. obj.style: This The method is that JS can only get the value written in the style attribute written in the html tag (style="..."), but cannot get the attribute defined in
JS gets CSS attribute value
< script type=”text/javascript”>
alert(document.getElementById(“css88″).style.width);//200px
alert(document.getElementById(“css88″).style.color) ;//Blank
2. Obj is used in IE .currentStyle method, while FF uses the getComputedStyle method

"DOM2-level style" enhances document.defaultView and provides the getComputedStyle() method. This method accepts two parameters: the element to get the calculated style from and a pseudo-element string (such as ":after"). If pseudo-element information is not required, the second parameter can be null. The getComputerStyle() method returns a CSSStyleDeclaration object that contains all calculated styles for the current element. Take the following HTML page as an example:
Copy code The code is as follows:
 
 
 
 
Computed element style</ title> <br><style> <br>#myDiv { <br>background-color:blue; <br>width:100px; <br>height:200px; <br>} <br></style> <br><body> <br><div id ="myDiv" style="background-color:red; border:1px solid black"></div> <br><script> <br> var myDiv = document.getElementById("myDiv"); <br>var computedStyle = document.defaultView.getComputedStyle(myDiv, null); <br>alert(computedStyle.backgroundColor); //"red" <br>alert(computedStyle .width); //"100px" <br>alert(computedStyle.height); //"200px" <br>alert(computedStyle.border); //In some browsers it is "1px solid black" <br></script> <br></body> <br></head> <br></html></span> <br>
</div> <br>The border attribute may not Returns the actual border rule in the style sheet (Opera will return it, but other browsers will not). The reason for this difference is that different browsers interpret comprehensive properties differently, because setting this property actually involves many other properties. When setting the border, you actually set the border width, color, and style attributes of the four sides. So even though computedStyle.border does not return a value in all browsers, computedStyle.borderLeftWidth does. <br><br>It should be noted that even if some browsers support this feature, the way the value is represented may be different. For example, Firefox and Safari will return all colors converted to RGB format. Therefore, even if the getComputedStyle() method is used, it is best to test it in several browsers. <br><br>IE does not support the getComputedStyle() method, but it has a similar concept. In IE, every element with a style attribute also has a currentStyle attribute. This property is an instance of CSSStyleDeclaration and contains all calculated styles of the current element. The methods to obtain these styles are similar, as follows: <br><div class="codetitle">
<span><a style="CURSOR: pointer" data="78940" class="copybut" id="copybut78940" onclick="doCopy('code78940')"><u>Copy the code</u></a></span> The code is as follows:</div>
<div class="codebody" id="code78940"> <br><span style="font-family:Arial;font-size:14px;">var myDiv = document.getElementById("myDiv"); <br>var computedStyle = myDiv.currentStyle; <br>alert(computedStyle.backgroundColor); //"red" <br>alert(computedStyle.width); //"100px" <br>alert(computedStyle.height); //"200px" <br>alert(computedStyle .border); //undefined</span> <br>
</div> <br>Same as the DOM version, IE does not return the border style because it is a comprehensive attribute. <br><br>3. A simple function I wrote when writing a test case (applicable to Chrome): <br><div class="codetitle">
<span><a style="CURSOR: pointer" data="18461" class="copybut" id="copybut18461" onclick="doCopy('code18461')"><u>Copy code</u></a></span> The code is as follows:</div>
<div class="codebody" id="code18461"> <br><span style="font-family:Arial;font-size:14px;">function getCSS(div){ <br>return document.defaultView .getComputedStyle(div, null); <br>//return div.currentStyle;//Not used, IE <br>}</span> <br>
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