js/tblength.js

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

//Set maxlength for multiline TextBox 
function setMaxLength(object, length) {
    var result = true;
    var controlid = document.selection.createRange().parentElement().id;
    var controlValue = document.selection.createRange().text;
    if (controlid == object.id && controlValue != "") {
        result = true;
    }
    else if (object.value.len() >= length) {
        result = false;
    }
    if (window.event) {
        window.event.returnValue = result;
        return result;
    }
}

//Check maxlength for multiline TextBox when paste 
function limitPaste(object, length) {
    var tempLength = 0;
    if (document.selection) {
        if (document.selection.createRange().parentElement().id == object.id) {
            tempLength = document.selection.createRange().text.len();
        }
    }
    var tempValue = window.clipboardData.getData("Text");
    tempLength = object.value.len() + tempValue.len() - tempLength;
    if (tempLength > length) {
        tempLength -= length;
        //alert(tempLength); 
        //alert(tempValue); 
        var tt = "";
        for (var i = 0; i < tempValue.len() - tempLength; i++) {
            if (tt.len() < (tempValue.len() - tempLength))
                tt = tempValue.substr(0, i + 1);
            else
                break;
        }
        tempValue = tt;
        window.clipboardData.setData("Text", tempValue);
    }

    window.event.returnValue = true;
}