辛辛苦苦整合的TextArea设置MaxLength的代码

Javascript代码

 

function SetTextAreaMaxLength(controlId,length)
{
    // JScript File for TextArea
    // Keep user from entering more than maxLength characters
    function doKeypress(control,length){
        maxLength = length;
        value = control.value;
        if(maxLength && value.length > maxLength-1){
            event.returnValue = false;
            maxLength = parseInt(maxLength);
        }
    }
    // Cancel default behavior
    function doBeforePaste(control,length){
        maxLength = length;
        if(maxLength)
        {
            event.returnValue = false;
        }
    }
    // Cancel default behavior and create a new paste routine
    function doPaste(control,length){
        maxLength = length;
        value = control.value;
        if(maxLength){
            event.returnValue = false;
            maxLength = parseInt(maxLength);
            var oTR = control.document.selection.createRange();
            var iInsertLength = maxLength - value.length + oTR.text.length;
            var sData = window.clipboardData.getData("Text").substr(0,iInsertLength);
            oTR.text = sData;
        }
    }

    function doDragenter(control,length)
    {
        maxLength = length;
        value = control.value;
        if(maxLength){
            event.returnValue = false;
        }
    }


    function addEvent(elm, evType, fn, useCapture)
    {
        if (elm.addEventListener)
        {
            elm.addEventListener(evType, fn, useCapture);
            return true;
        }
        else if (elm.attachEvent)
        {
            var r = elm.attachEvent('on' + evType, fn);
            return r;
        }
        else {
            elm['on' + evType] = fn;
        }
    }


    function AttacheventTextAreaBeforePaste(obj,length)
    {
        return function()
        {
            doBeforePaste(obj,length)
        }
    }

    function AttacheventTextAreaPaste(obj,length)
    {
        return function()
        {
            doPaste(obj,length)
        }
    }

    function AttacheventTextAreaKeyPress(obj,length)
    {
        return function()
        {
            doKeypress(obj,length)
        }

    }

    function AttacheventTextAreaDragEnter(obj,length)
    {
        return function()
        {
            doDragenter(obj,length);
        }
    }


    var obj = document.getElementById(controlId);

    addEvent(obj,'keypress',AttacheventTextAreaKeyPress(obj,length),null);
    addEvent(obj,'beforepaste',AttacheventTextAreaBeforePaste(obj,length),null);
    addEvent(obj,'paste',AttacheventTextAreaPaste(obj,length),null);
    addEvent(obj,'dragenter',AttacheventTextAreaDragEnter(obj,length),null);
}

function SetTextAreaMaxLength(controlId,length) { // JScript File for TextArea // Keep user from entering more than maxLength characters function doKeypress(control,length){ maxLength = length; value = control.value; if(maxLength && value.length > maxLength-1){ event.returnValue = false; maxLength = parseInt(maxLength); } } // Cancel default behavior function doBeforePaste(control,length){ maxLength = length; if(maxLength) { event.returnValue = false; } } // Cancel default behavior and create a new paste routine function doPaste(control,length){ maxLength = length; value = control.value; if(maxLength){ event.returnValue = false; maxLength = parseInt(maxLength); var oTR = control.document.selection.createRange(); var iInsertLength = maxLength - value.length + oTR.text.length; var sData = window.clipboardData.getData("Text").substr(0,iInsertLength); oTR.text = sData; } } function doDragenter(control,length) { maxLength = length; value = control.value; if(maxLength){ event.returnValue = false; } } function addEvent(elm, evType, fn, useCapture) { if (elm.addEventListener) { elm.addEventListener(evType, fn, useCapture); return true; } else if (elm.attachEvent) { var r = elm.attachEvent('on' + evType, fn); return r; } else { elm['on' + evType] = fn; } } function AttacheventTextAreaBeforePaste(obj,length) { return function() { doBeforePaste(obj,length) } } function AttacheventTextAreaPaste(obj,length) { return function() { doPaste(obj,length) } } function AttacheventTextAreaKeyPress(obj,length) { return function() { doKeypress(obj,length) } } function AttacheventTextAreaDragEnter(obj,length) { return function() { doDragenter(obj,length); } } var obj = document.getElementById(controlId); addEvent(obj,'keypress',AttacheventTextAreaKeyPress(obj,length),null); addEvent(obj,'beforepaste',AttacheventTextAreaBeforePaste(obj,length),null); addEvent(obj,'paste',AttacheventTextAreaPaste(obj,length),null); addEvent(obj,'dragenter',AttacheventTextAreaDragEnter(obj,length),null); }

 

HTML代码

 

<asp:TextBox ID="TextBoxAddress" runat="server" Width="200px"
                        TextMode="MultiLine" Height="113px" MaxLength="10"></asp:TextBox>

    <script language="javascript" type="text/javascript">
    SetTextAreaMaxLength('<%=TextBoxAddress.ClientID %>',10);

</script>

<asp:TextBox ID="TextBoxAddress" runat="server" Width="200px" TextMode="MultiLine" Height="113px" MaxLength="10"></asp:TextBox> <script language="javascript" type="text/javascript"> SetTextAreaMaxLength('<%=TextBoxAddress.ClientID %>',10); </script>

 

该javascript控制了输入,粘贴,拖放操作