Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
578 views
in Technique[技术] by (71.8m points)

javascript - What are the drawbacks of accessing DOM elements directly by ID?

Today I stumbled upon the possibility to access a DOM element in Javascript simply by its id e.g. like this:

elementid.style.backgroundColor = "blue"

I tested with a very short snippet if this works in IE, Firefox and Chrome - and it does. Here is the snippet I used:

<html><head>
<script>
    function highlight() {
        content.style.backgroundColor = "blue";
        content.style.color = "white";
    }
</script>
</head>
<body>
    <div id="content">test content</div>
    <div onclick="highlight()">highlight content</div>
</body></html>

So I wondered in which cases document.getElementById('elementid') should be used (or similar framework replacements like $()) and what are the drawbacks of the direct access.

I was not able to find any useful documentation on this. Everywhere either getElementById or framework methods are used.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

It is propriety Microsoft gubbins. It doesn't work in lots of browsers — especially in standards mode (and you want standards mode to avoid quirks mode inconsistencies such as IE getting width wrong).


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...