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
506 views
in Technique[技术] by (71.8m points)

javascript - Using document.getElementsByName() isn't working?

The code for the second alert command works as intended (displaying the value of the element "to", but the first alert command does not work (it's supposed to do the same thing). Why is this?

<html>
<head>
<script type="text/javascript">
function getValue()
??{
??alert(document.getElementsByName("to").value);
  alert(document.forms[0].to.value);??
??}
</script>
</head>
<body>
<form>
<input name="to" type="hidden" value="hoolah" />
<input type="button" onclick="getValue()" value="Get Value!" />
<form/>
</body>
</html>
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)

getElementsByName returns an HTMLCollection. You can access the value of the first item like this:

document.getElementsByName("to").item(0).value

Or like this:

document.getElementsByName("to")[0].value

More info:


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

...