Javascript validation error in asp.net

Question

I am getting a javascript validation error on my "Customer Search" page, when I click my "Search" button.

<asp:Button id="btnCustomerSearch" runat="server" onclientclick="return ValidateCustomer(1);" 
                                    Text="Continue" OnClick="btnCustomerSearch_Click" />

The error message is:

Microsoft JScript runtime error: 'ValidateCustomer' is undefined

however, in my ValidationFunctions.js, the ValidateCustomer function does exist.
How come the aspx cannot see that function (and how can I fix the issue) ?

Update:
The above issues are being caused as a result of the js file includes not being accurately referenced. However, I have an Alert messagebox in my code behind as indicated in this post and the alert message box don't appear as well. So this maybe a machine related issue.

How would I determine if the issue is machine related?

are you properly referencing your ValidationFunctions.js file? — Alex
– Alex, Commented Aug 14, 2012 at 14:52
Could you post that function here? Also, are you sure that this JS is linked at the page? — Andre Calil
– Andre Calil, Commented Aug 14, 2012 at 14:52
Are you sure you are referencing the script file correctly? Can you actually look at the source and navigate to it? — Icarus
– Icarus, Commented Aug 14, 2012 at 14:53
Can you also post the ValidateCustomer function? And also where it's referenced in your ASPX file? — David Hoerster
– David Hoerster, Commented Aug 14, 2012 at 14:55
This is a master page application. So I can see the <script type="text/javascript" src="Scripts/ValidationFunctions.js"></script> on the .Master file — DNR
– DNR, Commented Aug 14, 2012 at 14:56

Icarus · Accepted Answer · 2012-08-14 15:18:41Z

2

This is a master page application. So I can see the <script type="text/javascript" src="Scripts/ValidationFunctions.js"></script> on the .Master file

That might be a problem if the page you are on is in a subdirectory different from where the MasterPage is on.

One alternative I prefer is to add the external javascript files inside the ScriptManager if I am using one:

<asp:ScriptManager ID="SM1" runat="server">
  <Scripts>
    <asp:ScriptReference Path="~/js/ValidationScript.js" />
  </Scripts>
</asp:ScriptManager>

This guarantees that the script reference is always resolved to the proper path because the ScriptManager is a service-side control and uses ResolveClientUrl to resolve the path ~/js/ValidationScript.js.

If this is not an option or does not apply, I would reference the external JS files from the master page as so:

<head runat="server" id="page_header">
  <script type="text/javascript" src='<%=ResolveClientUrl("~/js/Validation.js")%>'  />
</head>

This guarantees that js directory is always resolved correctly regardless of where the page or the control is located.

answered Aug 14, 2012 at 15:18

Icarus

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2 Comments

DNR Over a year ago

wierd reaction.... when I include your script on the master page <script type="text/javascript" src='<%=ResolveClientUrl("~/js/Validation.js")%>' /> the application's start page does not load at all.... just keeps attempting to load but the start page never appears. When I change it back to my original script <script type="text/javascript" src="Scripts/ValidationFunctions.js"></script> the start page loads fine

Icarus Over a year ago

@DotNetRookie very strange. I just tested in my PC and definitely works fine.

<head runat="server">     <script type="text/javascript" src='<%=ResolveClientUrl("~/Scripts/jquery-1.4.1.js") %>' ></script> </head>

. The script path resolves properly. Without ResolveClientUrl returns the incorrect path when the page is not in the same directory as the MasterPage.

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