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Summary of method examples for obtaining various CSS style attributes in native javascript
Summary of method examples for obtaining various CSS style attributes in native javascript
The most familiar method for manipulating styles in native js is the Style object in the DOM. However, this method can only obtain and modify inline styles in html documents, and cannot operate non-inline styles (internal styles and external style sheets).
Get style
1. dom style
This method can only get inline styles:
var text = document.getElementById('text'); var textColor = text.style.color; // 得到textColor的值为 '#000'
2. currentStyle
This method only applies to IE The browser is similar in form to element.style. The difference is that currentStyle is just like its name - the current style (the style after css is loaded), which returns the current final CSS attribute value of the element, including The styles in the internal style tag and the css files imported from outside.
Usage: element.currentStyle.property
For example, we want to get the width of the box with the id:
##
var boxWidth = document.getElementById('box').currentStyle.width; // 得到boxWidth的值为 '200px'
3. getComputedStyle
var el = document.getElementById("box");
var style = window.getComputedStyle(el , ":after");// 这个函数需要传递两个参数：元素对象和样式属性名称
function getStyle(el, styleName) {
if( el.currentStyle ) {
// for IE
return el.currentStyle[styleName];
} else {
// for peace
return getComputedStyle(el, false)[styleName];
}
}var box = document.getElementById("box");
var boxWidth = getStyle(box, 'width');What is the difference between getComputedStyle and style?
Read-only and writable The
getComputedStyle method is read-only and can only get the style but not set it, butelement.style can both read and write.
The scope of objects obtained
The getComputedStyle method obtains all CSS attribute objects that are ultimately applied to the element (even if there is no CSS code, the default ancestor eight generations will be are displayed); and element.style can only get the CSS style in the element's style attribute. Therefore, for a bare element, the length attribute value (if any) returned by the getComputedStyle method in the object is 190+ (according to my tests, FF: 192, IE9: 195, Chrome: 253, the results may be different in different environments), And element.style is 0.
Set style
1. dom style
var el = document.getElementById('box'); el.style.backgroundColor = 'red';
2. cssText attribute
document.getElementById("d1").style.cssText = "color:red; font-size:13px;";
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