今天在改代码时，要把以前的ValidationSummary服务器控件，弹出验证信息后跳转页面。如果重新写客户端脚本验证太麻烦。所以想找个偷懒的方法，最好可以重载ValidationSummary 验证信息。那就开始找吧。

首先，在aspnetForm 上会调用 onsubmit="javascript:return WebForm_OnSubmit();",

当页面存在验证控件时： 

function WebForm_OnSubmit() {
   if (typeof(ValidatorOnSubmit) == "function" && ValidatorOnSubmit() == false) 
   return false;
 return true;
}

当页面不存在验证控件时：

function WebForm_OnSubmit() {
    null;
   return true;
}

这里我不考虑页面不存在验证控件的现象。

接着页面会调用 ValidatorOnSubmit 函数

var Page_ValidationActive = false;
if (typeof(ValidatorOnLoad) == "function") {    
  ValidatorOnLoad();
} 

function ValidatorOnSubmit() {   
    if (Page_ValidationActive) { 
           return ValidatorCommonOnSubmit();    
    }
    else { 
       return true; 
   }
}

然后在asp.net 中的验证脚本中会有个叫ValidatorCommonOnSubmit 的函数，这个验证脚本可以在ScriptResource.axd 中找到

页面在加载时会注册Page_ClientValidate(validationGroup) 函数。（但是说实话没太看懂ValidatorCommonOnSubmit和Page_ClientValidate之间是如何调用。）

if (causesValidation && (typeof(Page_ClientValidate) === 'function') && !Page_ClientValidate(validationGroup || null)) {            return;        }

最后在Page_ClientValidate函数中会调用 VlidationSummaryOnSubmit（validationGroup），在这里 asp.net ValidationSummary的消息就可以任我宰割了。

跟了一下代码后，虽然asp.net 验证控件最终还是用javascript验证的，但是他为了考虑不环境和意外境况，做了很多额外的处理。倒不如在做验证时，自己写脚本验证这样又节省性能，有容易控制。

以下是asp.net 验证控件的代码（可以在ScriptResource.axd 中找到）

var Page_ValidationVer = "125";
var Page_IsValid = true;
var Page_BlockSubmit = false;
var Page_InvalidControlToBeFocused = null;
function ValidatorUpdateDisplay(val) {
    if (typeof (val.display) == "string") {
        if (val.display == "None") {
            return;
        }
        if (val.display == "Dynamic") {
            val.style.display = val.isvalid ? "none" : "inline";
            return;
        }
    }
    if ((navigator.userAgent.indexOf("Mac") > -1) &&
        (navigator.userAgent.indexOf("MSIE") > -1)) {
        val.style.display = "inline";
    }
    val.style.visibility = val.isvalid ? "hidden" : "visible";
}
function ValidatorUpdateIsValid() {
    Page_IsValid = AllValidatorsValid(Page_Validators);
}
function AllValidatorsValid(validators) {
    if ((typeof (validators) != "undefined") && (validators != null)) {
        var i;
        for (i = 0; i < validators.length; i++) {
            if (!validators[i].isvalid) {
                return false;
            }
        }
    }
    return true;
}
function ValidatorHookupControlID(controlID, val) {
    if (typeof (controlID) != "string") {
        return;
    }
    var ctrl = document.getElementById(controlID);
    if ((typeof (ctrl) != "undefined") && (ctrl != null)) {
        ValidatorHookupControl(ctrl, val);
    }
    else {
        val.isvalid = true;
        val.enabled = false;
    }
}
function ValidatorHookupControl(control, val) {
    if (typeof (control.tagName) != "string") {
        return;
    }
    if (control.tagName != "INPUT" && control.tagName != "TEXTAREA" && control.tagName != "SELECT") {
        var i;
        for (i = 0; i < control.childNodes.length; i++) {
            ValidatorHookupControl(control.childNodes[i], val);
        }
        return;
    }
    else {
        if (typeof (control.Validators) == "undefined") {
            control.Validators = new Array;
            var eventType;
            if (control.type == "radio") {
                eventType = "onclick";
            } else {
                eventType = "onchange";
                if (typeof (val.focusOnError) == "string" && val.focusOnError == "t") {
                    ValidatorHookupEvent(control, "onblur", "ValidatedControlOnBlur(event); ");
                }
            }
            ValidatorHookupEvent(control, eventType, "ValidatorOnChange(event); ");
            if (control.type == "text" ||
                control.type == "password" ||
                control.type == "file") {
                ValidatorHookupEvent(control, "onkeypress",
                    "if (!ValidatedTextBoxOnKeyPress(event)) { event.cancelBubble = true; if (event.stopPropagation) event.stopPropagation(); return false; } ");
            }
        }
        control.Validators[control.Validators.length] = val;
    }
}
function ValidatorHookupEvent(control, eventType, functionPrefix) {
    var ev;
    eval("ev = control." + eventType + ";");
    if (typeof (ev) == "function") {
        ev = ev.toString();
        ev = ev.substring(ev.indexOf("{") + 1, ev.lastIndexOf("}"));
    }
    else {
        ev = "";
    }
    var func;
    if (navigator.appName.toLowerCase().indexOf('explorer') > -1) {
        func = new Function(functionPrefix + " " + ev);
    }
    else {
        func = new Function("event", functionPrefix + " " + ev);
    }
    eval("control." + eventType + " = func;");
}
function ValidatorGetValue(id) {
    var control;
    control = document.getElementById(id);
    if (typeof (control.value) == "string") {
        return control.value;
    }
    return ValidatorGetValueRecursive(control);
}
function ValidatorGetValueRecursive(control) {
    if (typeof (control.value) == "string" && (control.type != "radio" || control.checked == true)) {
        return control.value;
    }
    var i, val;
    for (i = 0; i < control.childNodes.length; i++) {
        val = ValidatorGetValueRecursive(control.childNodes[i]);
        if (val != "") return val;
    }
    return "";
}
function Page_ClientValidate(validationGroup) {
    Page_InvalidControlToBeFocused = null;
    if (typeof (Page_Validators) == "undefined") {
        return true;
    }
    var i;
    for (i = 0; i < Page_Validators.length; i++) {
        ValidatorValidate(Page_Validators[i], validationGroup, null);
    }
    ValidatorUpdateIsValid();
    ValidationSummaryOnSubmit(validationGroup);
    Page_BlockSubmit = !Page_IsValid;
    return Page_IsValid;
}
function ValidatorCommonOnSubmit() {
    Page_InvalidControlToBeFocused = null;
    var result = !Page_BlockSubmit;
    if ((typeof (window.event) != "undefined") && (window.event != null)) {
        window.event.returnValue = result;
    }
    Page_BlockSubmit = false;
    return result;
}
function ValidatorEnable(val, enable) {
    val.enabled = (enable != false);
    ValidatorValidate(val);
    ValidatorUpdateIsValid();
}
function ValidatorOnChange(event) {
    if (!event) {
        event = window.event;
    }
    Page_InvalidControlToBeFocused = null;
    var targetedControl;
    if ((typeof (event.srcElement) != "undefined") && (event.srcElement != null)) {
        targetedControl = event.srcElement;
    }
    else {
        targetedControl = event.target;
    }
    var vals;
    if (typeof (targetedControl.Validators) != "undefined") {
        vals = targetedControl.Validators;
    }
    else {
        if (targetedControl.tagName.toLowerCase() == "label") {
            targetedControl = document.getElementById(targetedControl.htmlFor);
            vals = targetedControl.Validators;
        }
    }
    var i;
    for (i = 0; i < vals.length; i++) {
        ValidatorValidate(vals[i], null, event);
    }
    ValidatorUpdateIsValid();
}
function ValidatedTextBoxOnKeyPress(event) {
    if (event.keyCode == 13) {
        ValidatorOnChange(event);
        var vals;
        if ((typeof (event.srcElement) != "undefined") && (event.srcElement != null)) {
            vals = event.srcElement.Validators;
        }
        else {
            vals = event.target.Validators;
        }
        return AllValidatorsValid(vals);
    }
    return true;
}
function ValidatedControlOnBlur(event) {
    var control;
    if ((typeof (event.srcElement) != "undefined") && (event.srcElement != null)) {
        control = event.srcElement;
    }
    else {
        control = event.target;
    }
    if ((typeof (control) != "undefined") && (control != null) && (Page_InvalidControlToBeFocused == control)) {
        control.focus();
        Page_InvalidControlToBeFocused = null;
    }
}
function ValidatorValidate(val, validationGroup, event) {
    val.isvalid = true;
    if ((typeof (val.enabled) == "undefined" || val.enabled != false) && IsValidationGroupMatch(val, validationGroup)) {
        if (typeof (val.evaluationfunction) == "function") {
            val.isvalid = val.evaluationfunction(val);
            if (!val.isvalid && Page_InvalidControlToBeFocused == null &&
                typeof (val.focusOnError) == "string" && val.focusOnError == "t") {
                ValidatorSetFocus(val, event);
            }
        }
    }
    ValidatorUpdateDisplay(val);
}
function ValidatorSetFocus(val, event) {
    var ctrl;
    if (typeof (val.controlhookup) == "string") {
        var eventCtrl;
        if ((typeof (event) != "undefined") && (event != null)) {
            if ((typeof (event.srcElement) != "undefined") && (event.srcElement != null)) {
                eventCtrl = event.srcElement;
            }
            else {
                eventCtrl = event.target;
            }
        }
        if ((typeof (eventCtrl) != "undefined") && (eventCtrl != null) &&
            (typeof (eventCtrl.id) == "string") &&
            (eventCtrl.id == val.controlhookup)) {
            ctrl = eventCtrl;
        }
    }
    if ((typeof (ctrl) == "undefined") || (ctrl == null)) {
        ctrl = document.getElementById(val.controltovalidate);
    }
    if ((typeof (ctrl) != "undefined") && (ctrl != null) &&
        (ctrl.tagName.toLowerCase() != "table" || (typeof (event) == "undefined") || (event == null)) &&
        ((ctrl.tagName.toLowerCase() != "input") || (ctrl.type.toLowerCase() != "hidden")) &&
        (typeof (ctrl.disabled) == "undefined" || ctrl.disabled == null || ctrl.disabled == false) &&
        (typeof (ctrl.visible) == "undefined" || ctrl.visible == null || ctrl.visible != false) &&
        (IsInVisibleContainer(ctrl))) {
        if ((ctrl.tagName.toLowerCase() == "table" && (typeof (__nonMSDOMBrowser) == "undefined" || __nonMSDOMBrowser)) ||
            (ctrl.tagName.toLowerCase() == "span")) {
            var inputElements = ctrl.getElementsByTagName("input");
            var lastInputElement = inputElements[inputElements.length - 1];
            if (lastInputElement != null) {
                ctrl = lastInputElement;
            }
        }
        if (typeof (ctrl.focus) != "undefined" && ctrl.focus != null) {
            ctrl.focus();
            Page_InvalidControlToBeFocused = ctrl;
        }
    }
}
function IsInVisibleContainer(ctrl) {
    if (typeof (ctrl.style) != "undefined" &&
        ((typeof (ctrl.style.display) != "undefined" &&
            ctrl.style.display == "none") ||
          (typeof (ctrl.style.visibility) != "undefined" &&
            ctrl.style.visibility == "hidden"))) {
        return false;
    }
    else if (typeof (ctrl.parentNode) != "undefined" &&
             ctrl.parentNode != null &&
             ctrl.parentNode != ctrl) {
        return IsInVisibleContainer(ctrl.parentNode);
    }
    return true;
}
function IsValidationGroupMatch(control, validationGroup) {
    if ((typeof (validationGroup) == "undefined") || (validationGroup == null)) {
        return true;
    }
    var controlGroup = "";
    if (typeof (control.validationGroup) == "string") {
        controlGroup = control.validationGroup;
    }
    return (controlGroup == validationGroup);
}
function ValidatorOnLoad() {
    if (typeof (Page_Validators) == "undefined")
        return;
    var i, val;
    for (i = 0; i < Page_Validators.length; i++) {
        val = Page_Validators[i];
        if (typeof (val.evaluationfunction) == "string") {
            eval("val.evaluationfunction = " + val.evaluationfunction + ";");
        }
        if (typeof (val.isvalid) == "string") {
            if (val.isvalid == "False") {
                val.isvalid = false;
                Page_IsValid = false;
            }
            else {
                val.isvalid = true;
            }
        } else {
            val.isvalid = true;
        }
        if (typeof (val.enabled) == "string") {
            val.enabled = (val.enabled != "False");
        }
        if (typeof (val.controltovalidate) == "string") {
            ValidatorHookupControlID(val.controltovalidate, val);
        }
        if (typeof (val.controlhookup) == "string") {
            ValidatorHookupControlID(val.controlhookup, val);
        }
    }
    Page_ValidationActive = true;
}
function ValidatorConvert(op, dataType, val) {
    function GetFullYear(year) {
        var twoDigitCutoffYear = val.cutoffyear % 100;
        var cutoffYearCentury = val.cutoffyear - twoDigitCutoffYear;
        return ((year > twoDigitCutoffYear) ? (cutoffYearCentury - 100 + year) : (cutoffYearCentury + year));
    }
    var num, cleanInput, m, exp;
    if (dataType == "Integer") {
        exp = /^\s*[-\+]?\d+\s*$/;
        if (op.match(exp) == null)
            return null;
        num = parseInt(op, 10);
        return (isNaN(num) ? null : num);
    }
    else if (dataType == "Double") {
        exp = new RegExp("^\\s*([-\\+])?(\\d*)\\" + val.decimalchar + "?(\\d*)\\s*$");
        m = op.match(exp);
        if (m == null)
            return null;
        if (m[2].length == 0 && m[3].length == 0)
            return null;
        cleanInput = (m[1] != null ? m[1] : "") + (m[2].length > 0 ? m[2] : "0") + (m[3].length > 0 ? "." + m[3] : "");
        num = parseFloat(cleanInput);
        return (isNaN(num) ? null : num);
    }
    else if (dataType == "Currency") {
        var hasDigits = (val.digits > 0);
        var beginGroupSize, subsequentGroupSize;
        var groupSizeNum = parseInt(val.groupsize, 10);
        if (!isNaN(groupSizeNum) && groupSizeNum > 0) {
            beginGroupSize = "{1," + groupSizeNum + "}";
            subsequentGroupSize = "{" + groupSizeNum + "}";
        }
        else {
            beginGroupSize = subsequentGroupSize = "+";
        }
        exp = new RegExp("^\\s*([-\\+])?((\\d" + beginGroupSize + "(\\" + val.groupchar + "\\d" + subsequentGroupSize + ")+)|\\d*)"
                        + (hasDigits ? "\\" + val.decimalchar + "?(\\d{0," + val.digits + "})" : "")
                        + "\\s*$");
        m = op.match(exp);
        if (m == null)
            return null;
        if (m[2].length == 0 && hasDigits && m[5].length == 0)
            return null;
        cleanInput = (m[1] != null ? m[1] : "") + m[2].replace(new RegExp("(\\" + val.groupchar + ")", "g"), "") + ((hasDigits && m[5].length > 0) ? "." + m[5] : "");
        num = parseFloat(cleanInput);
        return (isNaN(num) ? null : num);
    }
    else if (dataType == "Date") {
        var yearFirstExp = new RegExp("^\\s*((\\d{4})|(\\d{2}))([-/]|\\. ?)(\\d{1,2})\\4(\\d{1,2})\\.?\\s*$");
        m = op.match(yearFirstExp);
        var day, month, year;
        if (m != null && (m[2].length == 4 || val.dateorder == "ymd")) {
            day = m[6];
            month = m[5];
            year = (m[2].length == 4) ? m[2] : GetFullYear(parseInt(m[3], 10))
        }
        else {
            if (val.dateorder == "ymd") {
                return null;
            }
            var yearLastExp = new RegExp("^\\s*(\\d{1,2})([-/]|\\. ?)(\\d{1,2})(?:\\s|\\2)((\\d{4})|(\\d{2}))(?:\\s\u0433\\.)?\\s*$");
            m = op.match(yearLastExp);
            if (m == null) {
                return null;
            }
            if (val.dateorder == "mdy") {
                day = m[3];
                month = m[1];
            }
            else {
                day = m[1];
                month = m[3];
            }
            year = (m[5].length == 4) ? m[5] : GetFullYear(parseInt(m[6], 10))
        }
        month -= 1;
        var date = new Date(year, month, day);
        if (year < 100) {
            date.setFullYear(year);
        }
        return (typeof (date) == "object" && year == date.getFullYear() && month == date.getMonth() && day == date.getDate()) ? date.valueOf() : null;
    }
    else {
        return op.toString();
    }
}
function ValidatorCompare(operand1, operand2, operator, val) {
    var dataType = val.type;
    var op1, op2;
    if ((op1 = ValidatorConvert(operand1, dataType, val)) == null)
        return false;
    if (operator == "DataTypeCheck")
        return true;
    if ((op2 = ValidatorConvert(operand2, dataType, val)) == null)
        return true;
    switch (operator) {
        case "NotEqual":
            return (op1 != op2);
        case "GreaterThan":
            return (op1 > op2);
        case "GreaterThanEqual":
            return (op1 >= op2);
        case "LessThan":
            return (op1 < op2);
        case "LessThanEqual":
            return (op1 <= op2);
        default:
            return (op1 == op2);
    }
}
function CompareValidatorEvaluateIsValid(val) {
    var value = ValidatorGetValue(val.controltovalidate);
    if (ValidatorTrim(value).length == 0)
        return true;
    var compareTo = "";
    if ((typeof (val.controltocompare) != "string") ||
        (typeof (document.getElementById(val.controltocompare)) == "undefined") ||
        (null == document.getElementById(val.controltocompare))) {
        if (typeof (val.valuetocompare) == "string") {
            compareTo = val.valuetocompare;
        }
    }
    else {
        compareTo = ValidatorGetValue(val.controltocompare);
    }
    var operator = "Equal";
    if (typeof (val.operator) == "string") {
        operator = val.operator;
    }
    return ValidatorCompare(value, compareTo, operator, val);
}
function CustomValidatorEvaluateIsValid(val) {
    var value = "";
    if (typeof (val.controltovalidate) == "string") {
        value = ValidatorGetValue(val.controltovalidate);
        if ((ValidatorTrim(value).length == 0) &&
            ((typeof (val.validateemptytext) != "string") || (val.validateemptytext != "true"))) {
            return true;
        }
    }
    var args = { Value: value, IsValid: true };
    if (typeof (val.clientvalidationfunction) == "string") {
        eval(val.clientvalidationfunction + "(val, args) ;");
    }
    return args.IsValid;
}
function RegularExpressionValidatorEvaluateIsValid(val) {
    var value = ValidatorGetValue(val.controltovalidate);
    if (ValidatorTrim(value).length == 0)
        return true;
    var rx = new RegExp(val.validationexpression);
    var matches = rx.exec(value);
    return (matches != null && value == matches[0]);
}
function ValidatorTrim(s) {
    var m = s.match(/^\s*(\S+(\s+\S+)*)\s*$/);
    return (m == null) ? "" : m[1];
}
function RequiredFieldValidatorEvaluateIsValid(val) {
    return (ValidatorTrim(ValidatorGetValue(val.controltovalidate)) != ValidatorTrim(val.initialvalue))
}
function RangeValidatorEvaluateIsValid(val) {
    var value = ValidatorGetValue(val.controltovalidate);
    if (ValidatorTrim(value).length == 0)
        return true;
    return (ValidatorCompare(value, val.minimumvalue, "GreaterThanEqual", val) &&
            ValidatorCompare(value, val.maximumvalue, "LessThanEqual", val));
}
function ValidationSummaryOnSubmit(validationGroup) {
    if (typeof (Page_ValidationSummaries) == "undefined")
        return;
    var summary, sums, s;
    for (sums = 0; sums < Page_ValidationSummaries.length; sums++) {
        summary = Page_ValidationSummaries[sums];
        summary.style.display = "none";
        if (!Page_IsValid && IsValidationGroupMatch(summary, validationGroup)) {
            var i;
            if (summary.showsummary != "False") {
                summary.style.display = "";
                if (typeof (summary.displaymode) != "string") {
                    summary.displaymode = "BulletList";
                }
                switch (summary.displaymode) {
                    case "List":
                        headerSep = "<br>";
                        first = "";
                        pre = "";
                        post = "<br>";
                        end = "";
                        break;
                    case "BulletList":
                    default:
                        headerSep = "";
                        first = "<ul>";
                        pre = "<li>";
                        post = "</li>";
                        end = "</ul>";
                        break;
                    case "SingleParagraph":
                        headerSep = " ";
                        first = "";
                        pre = "";
                        post = " ";
                        end = "<br>";
                        break;
                }
                s = "";
                if (typeof (summary.headertext) == "string") {
                    s += summary.headertext + headerSep;
                }
                s += first;
                for (i = 0; i < Page_Validators.length; i++) {
                    if (!Page_Validators[i].isvalid && typeof (Page_Validators[i].errormessage) == "string") {
                        s += pre + Page_Validators[i].errormessage + post;
                    }
                }
                s += end;
                summary.innerHTML = s;
                window.scrollTo(0, 0);
            }
            if (summary.showmessagebox == "True") {
                s = "";
                if (typeof (summary.headertext) == "string") {
                    s += summary.headertext + "\r\n";
                }
                var lastValIndex = Page_Validators.length - 1;
                for (i = 0; i <= lastValIndex; i++) {
                    if (!Page_Validators[i].isvalid && typeof (Page_Validators[i].errormessage) == "string") {
                        switch (summary.displaymode) {
                            case "List":
                                s += Page_Validators[i].errormessage;
                                if (i < lastValIndex) {
                                    s += "\r\n";
                                }
                                break;
                            case "BulletList":
                            default:
                                s += "- " + Page_Validators[i].errormessage;
                                if (i < lastValIndex) {
                                    s += "\r\n";
                                }
                                break;
                            case "SingleParagraph":
                                s += Page_Validators[i].errormessage + " ";
                                break;
                        }
                    }
                }
                s += "- Wilt u de informatie compleet?"
                if (confirm(s)) {
                    window.location.href = "/storeCreateProfile.aspx";
                }
            }
        }
    }
}

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