Executing Javascript and C# functions through a single click

I need to call a method in Javascript and a method in C# when a button is clicked.

First, I want to call the C# method called 'Find_Direction' on click, which takes two inputs. Then, I want to call the Javascript method named calcRoute.

I attempted to do this, but it was unsuccessful:

<asp:Button id="Button1" UseSubmitBehavior="False" value="GetDirections" onclick="calcRoute" OnClientClick="Find_Direction" runat="server"/>

The following error occurred:

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1061: 'ASP.findroute_aspx' does not contain a definition for 'calcRoute' and no extension method 'calcRoute' accepting a first argument of type 'ASP.findroute_aspx' could be found (are you missing a using directive or an assembly reference?)
javascriptasp.netbutton

Answer №1

You have specified a Javascript function name in the onClick event. Instead, use a C# function name here.

Here is the C# code:

protected void Find_Direction(object sender, EventArgs e)
{
  // do your work

  // Register your Javascript function

  Page.ClientScript.RegisterStartupScript(this.GetType(), "script", "<script>calcRoute();</script>");
}

Your markup:

<asp:Button id="Button1" value="GetDirections" onclick="Find_Direction" runat="server"/>

Case 2: Calling the Javascript function before the server-side function

Javascript function:

function calcRoute() {
  
    alert('test')
    return true;
 }

Your markup:

<asp:Button id="Button1" value="GetDirections" onclick="Find_Direction" OnClientClick="return Find_Direction()" runat="server"/>

By doing this, you can call the Javascript function before the server-side one. Just ensure that you are returning true from the Javascript function to call your server-side function.

I hope this helps you solve your issue. :)

Answer №2

To ensure proper functionality, it is essential to have an event handler titled calcRoute in your code-behind file (either the aspx.cs or aspx.vb file).

If you prefer JavaScript execution to occur first, utilize OnClientClick to reference a JS function and OnClick to reference a C#/VB method (event handler) within your code.

If you want JavaScript to be executed after your C# code, manage the click event on the backend and then transmit the JavaScript back to the browser by initiating a startup script. This action may result in a full post-back, unless an update panel is being used. Inside your event handler, employ Page.RegisterStartupScript to send a JavaScript command back to the browser. In such instances, refrain from using OnClientClick altogether.

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