Unexpected identifier when using registerstartupscript

Question

I am fairly new to js and am having trouble when trying to call a js function from my codebehind.

C#:

protected void GridView3_OnSelectedIndexChanged(object sender, EventArgs e)
        {
            tbListOfCountries.Text = GridView3.SelectedRow.Cells[1].Text;
            Page.ClientScript.RegisterStartupScript(this.GetType(), "test", "test()", true);   
        }

JavaScript:

 function test() {
       alert("test");     
    }

And the Unexpected Identifier error:

//<![CDATA[
test()Sys.Application.add_init(function() {
    $create(Sys.Extended.UI.TabPanel, {"headerTab":$get("__tab_TabContainer1_TabPanel1"),"ownerID":"TabContainer1","wasLoadedOnce":true}, null, {"owner":"TabContainer1"}, $get("TabContainer1_TabPanel1"));
});

Any insights?

Possible duplicate of How to call javascript function from code-behind — PaulF
– PaulF, Commented Sep 14, 2017 at 15:47

DiskJunky · Accepted Answer · 2017-09-14 15:50:35Z

3

It looks like your script test() isn't syntactically correct. Try replacing with test();

answered Sep 14, 2017 at 15:50

DiskJunky

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3 Comments

TestNInja Over a year ago

I have tried that as well, but then I get the ReferenceError:test is not defined

DiskJunky Over a year ago

Well, you do actually need a method called test() in one of your script resources or in a <script> block in order for it to work. E.g., if you replace test(); with alert('boo!'); it should run

Learning Over a year ago

Excellent pick ';` missing

Hugo Yates · Accepted Answer · 2017-09-14 16:05:15Z

1

If you're running this in an UpdatePanel you may encounter some issues (especially on PostBack). I find this version works best:

Control sender = MyUpdatePanel;
string javaScript = "alert('Hello');"; 
ScriptManager.RegisterStartupScript(sender, sender.GetType(), Guid.NewGuid().ToString(), javaScript, true);

You'll need a ScriptManager tag on the page:

<asp:ScriptManager ID="MyScriptManager" runat="server" />

answered Sep 14, 2017 at 16:05

Hugo Yates

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2 Comments

TestNInja Over a year ago

I've tried your example and it works for the alert, however, when I try to set string javascript to the name of my function, it is no longer firing. Am i missing something?

Hugo Yates Over a year ago

Your function maybe out of context, is it at the top of the page or at the bottom? And is it nested in an UpdatePanel? Press F12 on your browser and see the Console for javascript errors this will give you a better indication of that's gone wrong.

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