Undefined procedure in code behind

Question

1.00/5 (1 vote)

See more:

I Have two Buttons in my ASP.NET page.

<asp:Button ID="UpLoadFile" runat="server" Text="File Selection" CssClass="FileSelection" OnClientClick="fireFileClick()"/>
<asp:FileUpload ID="UpLoadButton" runat="server" cssclass="FakeButton" OnChange="UpLoadBtn"/>

One is a regular Button and the other is a `FileUpload` Button. That is used in order to gain the ability to change the name of the Button I use.
Of course I have and a `script` in order to fire the `click` event in `FileUpload` Button:

function fireFileClick() {
    var objfile = Object;
    objfile = document.getElementById("");
    objfile.click();
}                       }

That script works just fine, triggers the `FileUpload` Button and gives the ability to select my willing file to upLoad.
Now here comes the time in order to act the `FileUpload` Button and that is made by caching the `OnChange` event. And this action is made it perfect.
As you can see in my previous refer I send this event action to a Public Shared procedure:

Public Shared Sub UpLoadBtn(sender As Object, e As EventArgs)

Here an Error is thrown:

Unhandled exception at line 115, column 119 in http://localhost:50761/Pages/Production.aspx
0x800a1391 - JavaScript runtime error: 'UpLoadBtn' is undefined

In this error I've seeing that

/Pages/Production.aspx

some times is

/Account/UsersHandler.aspx

Which is the last page from where I come to the `Production` page.
But that doesn't matter so much, because even if it is the right one the error throws it.

What I have tried:

I search allot around this issue but I haven't found anything related to this.
May be Unlucky OK.
Is there some one to assist me on this?

Posted 17-Jan-19 6:16am

Lefteris Gkinis

Updated 17-Jan-19 12:45pm

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Vincent Maverick Durano · Answer 1 · 2019-01-17T12:45:00

Solution 1

You can't call your server-side public method in your onchanged event directly as your client(HTML) doesn't know about your public method. One option is to use AJAX with PageMethod to that. Here's an example: https://www.aspsnippets.com/Articles/Calling-ASPNet-AJAX-PageMethods-using-ScriptManager-Example.aspx[^]

Posted 17-Jan-19 12:45pm

Vincent Maverick Durano

Comments

Lefteris Gkinis 17-Jan-19 20:24pm

I've made it as you saw me... like that:

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
</asp:ScriptManager>
<div id="FileBrowserDiv" runat="server"  class="FileBrowserDiv" >
<asp:Button ID="UpLoadFile" runat="server" Text="File Selection" CssClass="FileSelection" OnClientClick="fireFileClick()"/>
<script type="text/javascript">
	    function fireFileClick() {
	      var objfile = Object;
	      objfile = document.getElementById("<%= UpLoadButton.ClientID %>");
objfile.click();
}
</script>
<asp:FileUpload ID="UpLoadButton" runat="server" onchange="runasub()" cssclass="FakeButton" />
<script type="text/javascript">
 	function runasub() {
PageMethods.ControlHasFile.document.getElementById("<%=UpLoadButton.ClientID%>").value;
}
</script>

But this throws me an error:
Unhandled exception at line 159, column 9 in http://localhost:50761/Account/UsersHandler.aspx
0x800a1391 - JavaScript runtime error: 'PageMethods' is undefined

The `ControlHasFile` is the `Public Shared Sub` which is in code behind.
And with this Sub I want to handle the File that I select.

Vincent Maverick Durano 22-Jan-19 1:03am

You need to decorate your server method with the WebMethod attribute.