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CSS DOM dynamic styling

CSS DOM dynamic style

  • Use JS to operate each attribute in CSS.

  • JS can only operate or modify inline styles. For example: imgObj.style.border = “1px solid red”

  • For class styles, assign values ​​through className. For example: imgObj.className = “imgClass”

##style object

  • Each HTML tag has a style attribute. But this style attribute is also a style object.

  • So, what are the properties of this style object? The attributes of the style object correspond to the attributes in CSS one-to-one.

  • Therefore, the style object is used instead of CSS.

  • For example: imgObj.style.border = “1px solid red”;

##Conversion between style object attributes and CSS attributes

    If it is a word, style object attributes and CSS attributes Same.

    • If there are multiple words, the first word should be all lowercase, the first letter of each subsequent word should be capitalized, and the underscore should be removed.

    divObj.style.backgroundColor = “red”;

  • ## divObj.style.backgroundImage = “url(images /bg.gfi)";

  • divObj.style.fontSize = "18px";

  • <!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>php.cn</title>
        <script type="text/javascript">
            //网页加载完成
            window.onload = init;
            function init()
            {
                //获取id=img01的图片对象
                var imgObj = document.getElementById("img1");
                //给<img>标记添加行内样式
                imgObj.style.width = "400px";
                imgObj.style.border = "2px solid red";
                imgObj.style.padding = "20px 30px";
                imgObj.style.backgroundColor = "#f0f0f0";
            }
        </script>
    </head>
    <body >
        <img id="img1" src="/upload/course/000/000/009/580af7f52278b486.jpg" />
    </body>
</html>
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<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>php.cn</title> <script type="text/javascript"> //网页加载完成 window.onload = init; function init() { //获取id=img01的图片对象 var imgObj = document.getElementById("img1"); //给<img>标记添加行内样式 imgObj.style.width = "400px"; imgObj.style.border = "2px solid red"; imgObj.style.padding = "20px 30px"; imgObj.style.backgroundColor = "#f0f0f0"; } </script> </head> <body > <img id="img1" src="/upload/course/000/000/009/580af7f52278b486.jpg" /> </body> </html>
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