Calling C# Method from Javascript

Question

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Dear Friends,

I have used a dropdownlist box in page but onSelectedIndexChanges is not working in IE10.
So I have a placed button and calling the button click same function via javascript.
But I have from problem. Kindly check the below code.

XML

Javascript 
<script type="text/javascript">
        function funcall()
        {
            <%= Page.ClientScript.GetPostBackEventReference(Button1, String.Empty) %>;
        }
</script>

Code:
<asp:DropDownList runat="server" ID="cmb_category" Name="cmb_category" AutoPostBack="true"
OnChange="funcall();">
<asp:ListItem Value="A" Text="A"></asp:ListItem>
<asp:ListItem Value="B" Text="B"></asp:ListItem>
<asp:ListItem Value="C" Text="C"></asp:ListItem>
</asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

Code Behind:

protected void Button1_Click(object sender, EventArgs e)
    {
        if (cmb_category.SelectedValue != "")
        {
\\code
}
}

But I am facing problem as __dopostback is undefined.

Posted 1-Oct-13 23:04pm

Arunprasath Natarajan

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Comments

shiva2000 5-Oct-15 2:08am

asd

4 solutions

Solution 1

http://forums.asp.net/t/1414875.aspx[^]

http://stackoverflow.com/questions/18441194/how-to-call-a-c-sharp-function-from-javascript[^]

http://social.msdn.microsoft.com/Forums/en-US/f8ed3120-c81c-4d37-9d3e-a30837a7955b/call-c-method-with-javascript[^]

http://www.daniweb.com/web-development/aspnet/threads/31065/calling-c-function-through-javascript-in-asp.net[^]

lots of links available just from googling..................:)

Posted 1-Oct-13 23:13pm

Dholakiya Ankit

Comments

Arunprasath Natarajan 2-Oct-13 5:19am

I will be coming to Code Project after google only. But Thanks let me weather it will help me or not.

Dholakiya Ankit 2-Oct-13 5:25am

Yes check this out

Solution 2

visit here...

Call a C# Method From JavaScript Hosted in a WebBrowser[^]

or

Call C# Method From JavaScript[^]

Posted 1-Oct-13 23:22pm

Rakesh Meel

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**tanweer** · Accepted Answer · 2013-10-01T23:56:00

Solution 3

Hi,
If you have jQuery on your page then it is so simple

JavaScript

function funcall()
       {
           var id= '<%= Button1.ClientID%>;
           $('#'+id).click();
       }

Posted 1-Oct-13 23:56pm

tanweer

Comments

Ammar4556257 3-Oct-13 3:20am

tanweer bhai, This code is working fine but if I put a label on aspx page and in code behind changed the label text. I found that the debugger hits on code behind but when the page re-renders the new text is not assigned to the label.

tanweer 3-Oct-13 3:26am

Ok, will you show your code here so that i can check what is going wrong there.

**Azee** · Accepted Answer · 2013-10-02T02:30:00

Hey there,

first remove AutoPostBack="true" property of the DropDownList.

then, you can use the code suggest by tanweer in solution 3, or you can also try this:

JavaScript

function funcall()
        {
            document.getElementById('<%= Button1.ClientID%>').click();
        }

Hope it helps.

Azee

Calling C# Method from Javascript

4 solutions

Solution 3

Solution 4

Solution 1

Solution 2

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