Got javascript runtime error: myfunction is not defined

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In my code-behind code,

C#

Page.ClientScript.RegisterStartupScript(
     GetType(),
     "Javascript",
     "javascript:myFunction();",
     true);
//// --------- Below is the JavaScript function in .aspx
function myFunction() {
   debugger;
}

Got Uncaught reference error (or JavaScript runtime error): myFunction is undefined. How can this be debugged? Thanks.

What I have tried:

Got JavaScript Runtime error: "xxx" is not defined

Posted 1-Jul-16 3:02am

s yu

Updated 1-Jul-16 19:25pm

Patrice T

v4

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Comments

Karthik_Mahalingam 1-Jul-16 9:14am

tested your code, it works perfect, the problem is placing the code in right place.
you will have to provide more information or relevant code for understanding the issue.

ZurdoDev 1-Jul-16 9:20am

Is xxx the exact error? If not, give the exact error. If it is, then somewhere you are calling something called xxx and it does not exist.

s yu 1-Jul-16 9:28am

Here xxx = myFunction

ZurdoDev 1-Jul-16 9:30am

You need to be very clear. Post EXACT errors. Wherever you are calling it from does not see it. I don't think you need "javascript:myFunction()", you can just do "myFunction();" but I don't know if that would make much difference.

s yu 1-Jul-16 9:33am

Tested w/ and w/ javascript: before myFunction. The error message is identical.

ZurdoDev 1-Jul-16 9:34am

Where are you calling it from? You need to post that too.

Karthik_Mahalingam 1-Jul-16 9:35am

post the entire code.

s yu 1-Jul-16 9:55am

In my project,
1) Click btn_Query to call a client javascript first.
2) In the javascript, it calls the code-behind event
document.getElementById('<%=btnQuery.ClientID%>').click();
3) In the code-behind: btnQuery_Click(object sender, EventArgs e), there is the code: Page.ClientScript.RegisterStartupScript()
I guess that it may not allow me to run javascript again.

ZurdoDev 1-Jul-16 10:19am

I suggest you not try to keep going back and forth between JS and C#. Why can't you call all your JS from JS?

Karthik_Mahalingam 1-Jul-16 12:05pm

are you using update panel?

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JayantaChatterjee · Answer 1 · 2016-07-01T19:25:00

JavaScript is executed top to bottom approach. that's why you need to first define the function and then call the function.
In you case the ClientScript.RegisterStartupScript Register the Script on the startup(when the document is loaded), your myFunction is defined at bottom of the page,that's means your myFunction still not been executed by the browser..
You can change the RegisterStartupScript to RegisterClientScriptBlock after the the myFunction is defined...