An issue in ASP.net user control not triggering a specific javascript function

I am currently working on an asp.net web application where I have implemented a repeater that calls a registered user control. Within this user control, there is a button that is supposed to trigger a Javascript function to make an Ajax call for server-side actions. However, the button does not seem to be calling the Javascript method and upon inspecting the source code, I noticed that the Javascript function is being repeated for every item in the repeater. How can I prevent this repetition, especially since I need to access server items within the function? Additionally, why is the function not being called as expected?

Thank you!

sercontrol.ascx 

<div id="divBtnEvent" runat="server"> 
   <input type="button" id="btnAddEvent" class="ok-green" onclick="saveEvent();" /> 
</div> 

<script type="text/javascript"> 
    function saveEvent() 
    { 
           var eventText = document.getElementById('<%=txtEventDescription.ClientID%>').value; 
           // make ajax call 
     } 

Answer №1

Issue 1: While examining the source code, I noticed that the JavaScript function is duplicated for every item in the repeater component.

Resolution: To address this issue, place your JavaScript function on the page where the user control is being utilized. Additionally, ensure that the references to your JavaScript files are included on the main page and not within the user control itself.

Problem 2: Attempting to retrieve the control's value as <%=txtEventDescription.ClientID%>, which may be located within a user control.

Solution: Review the page source code to identify the actual client ID of the control.

If you continue to experience difficulties with calling the JavaScript function, consider checking Firefox's Error Console for further insight.

We hope this guidance proves helpful in resolving your issues.

Answer №2

Someone mentioned that

after checking the code in detail, it seems like the JavaScript function is duplicated for each item in the repeater

To fix this issue, try organizing your JavaScript like this:

<head runat="server">
//place your JS here
</head>

I believe this could be causing the problem

Answer №3

To ensure proper functionality, replace the saveEvent function definition from the user control onto the page where the control is being used. It appears that this function relies on the textbox ID from that specific page. If you include a JavaScript block within the user control's markup, it will be included when the control is rendered. To prevent this, consider registering the JavaScript from the server code and checking if it has already been registered. Additionally, only the last function definition is taken into account as each new control instance renders, potentially redefining the previous one.

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