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限制TextArea文本长度

2008-12-25 15:32 253 查看

maxlength.htc
------------------
<PUBLIC:COMPONENT id="bhvMaxlength" urn="maf:Maxlength">
<PUBLIC:PROPERTY name="maxLength" />
<PUBLIC:ATTACH event="onkeypress" handler="doKeypress" />
<PUBLIC:ATTACH event="onbeforepaste" handler="doBeforePaste" />
<PUBLIC:ATTACH event="onpaste" handler="doPaste" />

<SCRIPT language="JScript">
// Keep user from entering more than maxLength characters
function doKeypress(){
if(!isNaN(maxLength)){
maxLength = parseInt(maxLength);
var oTR = element.document.selection.createRange();
// Allow user to type character if at least one character is selected
if(oTR.text.length >= 1)
event.returnValue = true;
else if(value.length > maxLength-1)
event.returnValue = false;
}
}
// Cancel default behavior
function doBeforePaste(){
if(!isNaN(maxLength))
event.returnValue = false;
}
// Cancel default behavior and create a new paste routine
function doPaste(){
if(!isNaN(maxLength)){
event.returnValue = false;
maxLength = parseInt(maxLength);
var oTR = element.document.selection.createRange();
var iInsertLength = maxLength - value.length + oTR.text.length;
var sData = window.clipboardData.getData("Text").substr(0,iInsertLength);
oTR.text = sData;
}
}
</SCRIPT>

</PUBLIC:COMPONENT>
-----------
test.htm
-----------
<html>
<head>
</head>
<body>
<form method="POST">
<p><input type="text" size="30" maxlength="50" name="T1">
<textarea name="S1" rows="4" cols="30" maxlength="50" style="behavior:url(maxlength.htc)"></textarea>
</form>
</body>
</html>

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标签： behavior character function maf user html

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