首頁 > 開發者 > JavaScript
在Html中，textarea沒有maxlength的屬性。所有，要限定其輸入長度，就要自己編寫教本來實現。下面是一個實現的例子：
<html>
<head>
<script language="JavaScript">
<!--
function doKeyPress(maxLen){
var str=myform.test.value;
var oSR=document.selection.createRange();
if(str.length<maxLen){
return true;
}else if(oSR.text.length>0){
return true;
}else{
return false;
}
}
function checkPaste(maxLen){
var str=myform.test.value;
var oSR=document.selection.createRange();
var strData=clipboardData.getData('text');
var iLenPaste=maxLen-str.length+oSR.text.length;
oSR.text=strData.substring(0,iLenPaste);
return false;
}
// -->
</script>
</head>
<body>
<form name="myform">
<textarea name="test"
onKeyPress="event.returnValue=doKeyPress(10)"
onPaste="event.returnValue=checkPaste(10)" cols=100
rows=5>
</textarea>
</form>
</body>
</html>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
