急：textBpx控件输入中文时不触发客户端keydown和keyPress事件，请指教！

csxwd 2007-12-24 03:49:19

最近在改进Web的textBox控件，因为maxLength属性仅仅按照Unicode码进行长度校验，且在多行时无效。如果在keyUp事件中判断长度进行截取，那可以做到。问题是：现在希望超出长度时，按下键就不输入，而不是先输入后被截掉这种效果。但是输入中文时又不触发keyDown或keyPress事件。头疼啊，这个月要交付了，请各位帮帮小弟。

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指间的风 2007-12-26

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上边的那个发错了

String.prototype.len=function()
{
return this.replace(/[^\x00-\xff$]/g,"**").length;
}

function CheckLengthForJs(args)
{
var ValidStrLength=4000;
if (args.value.len()<=ValidStrLength)
{

return true;
}

else
{
args.select();
return false;
}

}
在提交以前，先验证一下长度。

指间的风 2007-12-26

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String.prototype.len=function()
{
return this.replace(/[^\x00-\xff$]/g,"**").length;
}
function CheckLength(oSrc, args)
{
var ValidStrLength=4000;
if (args.Value.len()<=ValidStrLength)
args.IsValid = true;
else
args.IsValid = false;
}

在提交以前，先验证一下长度。

toyleo 2007-12-25

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>

 <head>

  <title> New Document </title>

  <meta name="Generator" content="EditPlus">

  <meta name="Author" content="">

  <meta name="Keywords" content="">

  <meta name="Description" content="">

  <script language="JavaScript">

  <!--

	String.prototype.ansiLength = function()

	{

		var nl = this.length;

		var al = nl;

		for (var i = 0; i < nl; i++)

		{

			if (this.charCodeAt(i) > 127)

			{

				al = al + 1;

			}

		}

		return al;

	}



	function keyd(obj)

	{

		var nKeyCode = event.keyCode;

		if (event.ctrlKey || nKeyCode==8 || nKeyCode==46 || nKeyCode==37 || nKeyCode==38 || nKeyCode==39 || nKeyCode==40) return true;

		var rng = document.selection.createRange();

		var nLeft = 50 - obj.value.ansiLength() + rng.text.ansiLength();

		if (nLeft<=0) return false;

		return true;

	}



	function valuefix(obj)

	{

		if ((event.propertyName == "value")&&(obj.value.ansiLength() > 50))

		{

			obj.value = SubAnsiStr(obj.value,50);

		}

	}



function SubAnsiStr(str,i)

{

    if (i <= 0) return '';

    var iCount = 0;

    var sReturn = '';

    for (var j = 0; j < str.length; j++)

    {

        if ((str.charCodeAt(j) >= 32) && (str.charCodeAt(j) <= 126))

        {

            if ((i - iCount) == 0) return sReturn;

            sReturn += str.charAt(j);

            iCount++;

        }

        else if ((str.charCodeAt(j) == 13)||(str.charCodeAt(j+1) == 10))

        {

            if ((i - iCount) <= 1) return sReturn;

            sReturn += str.charAt(j);

            sReturn += str.charAt(j+1);

            iCount = iCount + 2;

            j++;

        }

        else

        {

            if ((i - iCount) <= 1) return sReturn;

            sReturn += str.charAt(j);

            iCount = iCount + 2;

        }

    }

    return sReturn;

}

  //-->

  </script>

 </head>



 <body>

  <textarea style="width:150px;height:70px" onpropertychange="return valuefix(this);" onkeydown="return keyd(this);" ></textarea>

  <input onpropertychange="return valuefix(this);" onkeydown="return keyd(this);" ></input>

 </body>

</html>

差不多了吧

JK_10000 2007-12-24

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<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>New Page 1</title>
</head>

<body>
<textarea maxlength=30 onbeforedeactivate=" return checkMaxLength(this);">fds afds afds afd afds afdsa fdsa fdsa fdfdsa fdsa fds afdsa </textarea>
</body>

</html>
<script>
/**
*checkMaxLength.
*/
function checkMaxLength(textareaObj,maxLength)
{
if(maxLength == null) maxLength=textareaObj.getAttribute("maxLength");
if(maxLength == null) maxLength=1024;
var currentLength = textareaObj.value.length;
if (currentLength > maxLength) {
alert("The length of your input ("+currentLength+") is larger than maxLength ("+maxLength+") .");
if(textareaObj.createTextRange){
var textRange=textareaObj.createTextRange();
var enterMatch=textareaObj.value.substr(0,maxLength).match(/\n/ig);
var enterNum=0;
if(enterMatch) enterNum=enterMatch.length
textRange.moveStart('character',maxLength-enterNum);
textRange.select();
}
else {
textareaObj.focus();
textareaObj.setSelectionRange(maxLength, currentLength);
}
window.latestValidateObj=textareaObj;
setTimeout("window.latestValidateObj.focus();",0);
return false;
}
return true;
}
</script>

JK_10000 2007-12-24