WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for ‘jquery’. Please add a ScriptResourceMapping named jquery(case-sensitive)

I’m building a web application using Visual Studio 2012.
I’m attempting to add word count into my textbox.
However after adding the the javascript codes and the html codes. I receive the error as stated above.

Here is my javascript codeds

Code :

function validateLimit(obj, divID, maxchar) {

objDiv = get_object(divID);

if (this.id) obj = this;

var remaningChar = maxchar - trimEnter(obj.value).length;

if (objDiv.id) {
    objDiv.innerHTML = remaningChar + " characters left";
if (remaningChar <= 0) {
    obj.value = obj.value.substring(maxchar, 0);
    if (objDiv.id) {
        objDiv.innerHTML = "0 characters left";
    return false;
{ return true; }

function get_object(id) {
var object = null;
if (document.layers) {
    object = document.layers[id];
} else if (document.all) {
    object = document.all[id];
} else if (document.getElementById) {
    object = document.getElementById(id);
return object;

function trimEnter(dataStr) {
return dataStr.replace(/(rn|r|n)/g, "");

Server codes in master page

<script type="text/javascript" src="js/JScript.js" ></script>

ASPX codes, ( Html codes )

<th style="width: 595px; height: 135px;">Official Report :</th>
<td colspan="4" style="height: 135px">
  <asp:TextBox ID="tbofficial" runat="server" Height="121px" TextMode="MultiLine" Width="878px" MaxLength="500"   ToolTip="Summary:(500 characters)" onkeyup="return validateLimit(this, 'lblMsg1', 500)" ></asp:TextBox>
  <div id="lblMsg1">500 characters left</div>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
        ControlToValidate="tbofficial" Display="Dynamic" 
  <br />
  <asp:Label ID="lblmsg" runat="server"></asp:Label>
  <br />
  <br />
        <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" />
  <asp:Button ID="btnClear" runat="server" Text="Clear" OnClick="btnClear_Click" />


Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

You need a web.config key to enable the pre 4.5 validation mode.

More Info on ValidationSettings:UnobtrusiveValidationMode:

Specifies how ASP.NET globally enables the built-in validator controls
to use unobtrusive JavaScript for client-side validation logic.

Type: UnobtrusiveValidationMode

Default value: None

Remarks: If this key value is set to “None” [default], the ASP.NET
application will use the pre-4.5 behavior (JavaScript inline in
the pages) for client-side validation logic. If this key value is set
to “WebForms”, ASP.NET uses HTML5 data-attributes and late bound
JavaScript from an added script reference
for client-side validation


      <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />

Method 2

Rather than disabling a new feature, I opted to follow the instructions of the error. In my global.asax.cs I added:

protected void Application_Start(object sender, EventArgs e)
    string JQueryVer = "1.7.1";
    ScriptManager.ScriptResourceMapping.AddDefinition("jquery", new ScriptResourceDefinition
        Path = "~/Scripts/jquery-" + JQueryVer + ".min.js",
        DebugPath = "~/Scripts/jquery-" + JQueryVer + ".js",
        CdnPath = "http://ajax.aspnetcdn.com/ajax/jQuery/jquery-" + JQueryVer + ".min.js",
        CdnDebugPath = "http://ajax.aspnetcdn.com/ajax/jQuery/jquery-" + JQueryVer + ".js",
        CdnSupportsSecureConnection = true,
        LoadSuccessExpression = "window.jQuery"

This comes from an msdn blog post which highlights some of the advantages of script resource mappings. Of particular interest to me was centralized control over the delivery of the script files based on “debug=true”, EnableCDN, etc.

Method 3

There are at least three ways to disable the use of unobtrusive JavaScript for client-side validation:

  1. Add the following to the web.config file:
        <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
  2. Set the value of the System.Web.UI.ValidationSettings.UnobtrusiveValidationMode static property to System.Web.UI.UnobtrusiveValidationMode.None
  3. Set the value of the System.Web.UI.Page.UnobtrusiveValidationMode instance property to System.Web.UI.UnobtrusiveValidationMode.None

To disable the functionality on a per page basis, I prefer to set the Page.UnobtrusiveValidationMode property using the page directive:

<%@ Page Language="C#" UnobtrusiveValidationMode="None" %>

Method 4

Unobtrusive validation is enabled by default in new version of ASP.NET. Unobtrusive validation aims to decrease the page size by replacing the inline JavaScript for performing validation with a small JavaScript library that uses jQuery.

You can either disable it by editing web.config to include the following:

  <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />

Or better yet properly configure it by modifying the Application_Start method in global.asax:

void Application_Start(object sender, EventArgs e) 
        new ScriptResourceDefinition
            Path = "/~Scripts/jquery-2.1.1.min.js"

Page 399 of Beginning ASP.NET 4.5.1 in C# and VB provides a discussion on the benefit of unobtrusive validation and a walkthrough for configuring it.

For those looking for RouteConfig. It is added automatically when you make a new project in visual studio to the App_Code folder. The contents look something like this:

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Routing;
using Microsoft.AspNet.FriendlyUrls;

namespace @default
    public static class RouteConfig
        public static void RegisterRoutes(RouteCollection routes)
            var settings = new FriendlyUrlSettings();
            settings.AutoRedirectMode = RedirectMode.Permanent;

Method 5

to add a little more to the answer from b_levitt…
on global.asax:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.SessionState;
using System.Web.UI;

namespace LoginPage
    public class Global : System.Web.HttpApplication
        protected void Application_Start(object sender, EventArgs e)
            string JQueryVer = "1.11.3";
            ScriptManager.ScriptResourceMapping.AddDefinition("jquery", new ScriptResourceDefinition
                Path = "~/js/jquery-" + JQueryVer + ".min.js",
                DebugPath = "~/js/jquery-" + JQueryVer + ".js",
                CdnPath = "http://ajax.aspnetcdn.com/ajax/jQuery/jquery-" + JQueryVer + ".min.js",
                CdnDebugPath = "http://ajax.aspnetcdn.com/ajax/jQuery/jquery-" + JQueryVer + ".js",
                CdnSupportsSecureConnection = true,
                LoadSuccessExpression = "window.jQuery"

on your default.aspx

   <form id="UserSectionForm" runat="server">
     <asp:ScriptManager ID="ScriptManager" runat="server">
               <asp:ScriptReference Name="jquery" />
     <%--rest of your markup goes here--%>         

Method 6

I believe I have encountered the same quandary. I started encountering the problem when I changed to:

<httpRuntime targetFramework="4.5"/>

Which gives the error message you describe above.


  <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />

Solves the issue, but then it makes your validation controls/scripts throw Javascript runtime errors.
If you change to:

<httpRuntime targetFramework="4.0"/>

You should be OK, but you’ll have to make sure the rest of your code does/ behaves as desired. You might also have to forgo some new features only available in 4.5 onward.

P.S. It is highly recommended that you read the following before implementing this solution. Especially, if you use Async functionality:


UPDATE April 2017:
After some some experimentation and testing I have come up with a combination that works:

<add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
<httpRuntime targetFramework="4.5.1" />


jQuery version 1.11.3

Method 7

The problem occurred due to the Control validator. Just Add the J Query reference to your web page as follows and then add the Validation Settings in your web.config file to overcome the problem. I too faced the same problem and the below gave the solution to my problem.


Code to be added in web page

Step2 :

Code to be added in Web.config file

It will resolve your problem.

Method 8

It has 3 solutions that other guys told upper…
but when try Application_Start solution, My other jQuery library like Pickup_Date_and_Time doesn’t work…
so I test second way and it’s answered:
1- set the Target FrameWork to Pre 4.5
2- Use ” UnobtrusiveValidationMode=”None” ” in your page header =>

<%@ Page Title="" Language="C#" 
    UnobtrusiveValidationMode="None" %>

it works for me and doesn’t disrupt my other jQuery function.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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