How to call a javascript method from aspx.cs

Question

I want to call a method hello() in javascript from aspx.cs ( c# ) when a listbox1 item is selected.Using this code to do it but not working

protected void ListBox1_TextChanged(object sender, EventArgs e)
    {
        ClientManager.RegisterStartupScript(this, GetType(), "whatiskey","hello();", true); 
    }

    function hello() {
alert("hiiiii");
 var arr = ["<%=myvalue %>"];


            }

try : Page.ClientScript.RegisterStartupScript( GetType(), "whatiskey", "hello();", true); — Zaki
– Zaki, Commented Jan 20, 2016 at 9:44
@Zaki not working , does the key parameter has to do something with it as I have no key defined at javascript its just a method — phpnet
– phpnet, Commented Jan 20, 2016 at 9:49
try ClientManager.RegisterStartupScript(this, GetType(), "whatiskey","javascript:hello();", true); and also put an alert on the first line of the method. And also check console for any error — Satyaki Chatterjee
– Satyaki Chatterjee, Commented Jan 20, 2016 at 9:53

denisv · Accepted Answer · 2016-01-20 10:06:50Z

2

Setting "AutoPostBack" property of ListBox to "true" and using Page.ClientScript.RegisterStartupScript(GetType(), "whatiskey", "hello();", true); worked for me

answered Jan 20, 2016 at 10:06

denisv

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4 Comments

phpnet Over a year ago

Sorry for marking it unanswered , the page is being refreshed but the method is not being called

denisv Over a year ago

@phpnet Can you provide "hello" method declaration, please? Where is it declared?

denisv Over a year ago

@phpnet Javascript is enabled in browser? That still works fine for me

phpnet Over a year ago

Yes it is , thank you for your reply I think there is some other problem at my side

Gaurav Kalele · Accepted Answer · 2016-01-20 10:54:16Z

1

use

Response.Write("<script>hello();</script>");

EDIT

if all you wanna do is call a javascript on selection of an item, you can use onchange attribute as follows -

<asp:ListBox onchange="hello();" ID="ListBox1" runat="server">
        <asp:ListItem>1</asp:ListItem>
        <asp:ListItem>2</asp:ListItem>

    </asp:ListBox>
    <script>
        function hello() {
            alert("hello");
        }
    </script>

edited Jan 20, 2016 at 10:54

answered Jan 20, 2016 at 9:54

Gaurav Kalele

1398 bronze badges

1 Comment

Gaurav Kalele Over a year ago

have you set EnableAutoPostBack property of ListBox to true ?

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