How to call function in code-behind c# with javascript?

Question

How to call function in code-behind in c# with javascript?

I have this code behind :

protected void btn_Click(object sender, EventArgs e)
{
    if (btn != null && btn.Checked)
    {
        Response.Redirect(string.Format("get.aspx?a={0}&b={1}", 
                                         a.SelectedValue, b.SelectedValue));
    }
}

And I have a Checkbox :

<asp:CheckBox ID="btn" runat="server" Checked="false" />

I am tryong to call that function btn_Click in javascript :

var btn = document.getElementById("btn");

if (btn.checked) {
    '<% = btn_Click() %>'
}

But not worked!!! Why? Thanks.

this might help you http://stackoverflow.com/questions/3713/call-asp-net-function-from-javascript — Avinash patil, Mar 25 '14 at 13:41
try this document.getElementById('<%=btn.ClientID %>') and see if that works.Also alert(btn) and see if its not returning null. Also you need to do postback to call server side btn_click event. — rach, Mar 25 '14 at 13:43

score 1 · Accepted Answer · answered Mar 25 '14 at 13:43

1

You can do a proper ajax approach explained here -> http://www.techillumination.in/2013/07/an-aspnet-way-to-call-server-side.html

answered Mar 25 '14 at 13:43

TBAR

448
2
10

score 0 · Answer 2 · answered Mar 25 '14 at 12:37

0

you can do it like this using Jquery, This is not tested

var button = $("#btn");
$(button).trigger("click");

answered Mar 25 '14 at 12:37

Amarnath R Shenoy

5,121
8
24
32

Not worked: `var btn = $("#btn"); if (btn.checked) { $(btnV).trigger("btn_Click()"); }` – Hamamelis Mar 25 '14 at 12:50
did u added jquery library it is jquery and is supposed to work – Amarnath R Shenoy Mar 25 '14 at 12:52
in my aspx page: `` and the `btn_Click` not called ... – Hamamelis Mar 25 '14 at 12:54

How to call function in code-behind c# with javascript?

2 Answers2