<textarea name="textarea" id="textarea" ></textarea>
<script language="javascript">
function a(){
if(document.getElementById("textarea").value.length >10){
alert("超过10字符");
}
}
</script>
可超过10个字符！弹出对话框后，点确定后！还能继续输入！输入后再弹出对话框！ .......

能不能让其在够10个字符后，再输入不了文字!  怎样修改　，谢谢！

test.html:
<form method="POST">
<textarea name="S1" rows="4" cols="30" maxlength="100" style="behavior:url(maxlength.htc)"></textarea>
</form>

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>

[[italic] 本帖最后由 zhulei1978 于 2007-11-25 15:02 编辑 [/italic]]

太长了，不好吧！

<textarea name="textarea" id="textarea" ></textarea>
<script language="javascript">
function a(){
if(document.getElementById("textarea").value.length >10){
alert("超过10字符");
return false;
}
}
</script>

4楼！你这代码，到5个字符弹出对话框后！不能修改！　我想要的是效果是：　到5个字符后，弹出对话框，光标还在文本框中，还能够修改！但还不能超过5个字符！

自定义一个弹出窗口，用非模式弹出。