call asp.net c# function from javascript problem. page not give error but c# function "testc()" and "testd()" not working. what is problem?

Question

1.00/5 (1 vote)

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XML

<script type="text/javascript">
             var myVar = setInterval(function () { myTimer() }, 1)
 function myTimer() {

 if (document.getElementById("Player").PlayState.toString() == "2")

{   <%testc();%>  }

else

{  <%testd();%> }

}
</script>


CODE BEHIND

public void testc()
 {
Label38.Text = "work"
}

 public void testd()
 {
Label38.Text = "not work";
 }

Posted 14-Oct-14 0:52am

alienqueen

Updated 14-Oct-14 0:55am

v3

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Comments

VC.J 14-Oct-14 6:56am

why do you need to call testc() from code behind there are better way to do that

VC.J 14-Oct-14 6:57am

Like this document.getElementById(Label38).innerText= 'work';

alienqueen 14-Oct-14 18:17pm

i can write Label38.text value. this is not important for me.

important thing is calling c# function from javascript. this function not working.

and my answer: because i use Label38 for testing. this c# function work or not. but i see it is not working. i could not solve it

4 solutions

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ZurdoDev · Answer 1 · 2014-10-14T01:28:00

You can't call it that way because the C# executes on the server and then disconnects with the client and the JavaScript then runs on the client.

Just do as the comment suggest, use JavaScript or the jQuery library to change the textbox.

In jQuery it is very easy:

JavaScript

$("#Label38").val("whatever you want");

And if your real code is as simple as you have shown here then use one function and pass in a variable instead of 2 functions that do almost the same thing.

VC.J · Answer 2 · 2014-10-14T18:08:00

in code behind use this

C#

[WebMethod]
       public static void testc()
       {
           var abc = 1212;
       }

add script manager

XML

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
    </asp:ScriptManager>

Set EbablePageMethods to true

add an Anchor tag

<a href="javascript:testWebMethods();">More >>></a>

function testWebMethods() {
       PageMethods.testc(onSucess);
             function onSucess(result) {
                 alert('hi' );
             }

}

this is an example to call webmethod

alienqueen · Answer 3 · 2014-10-14T22:54:00

Solution 4

my visual studio doesn't see when i write "PageMetods"

Posted 14-Oct-14 22:54pm

alienqueen

Mathew Soji · Answer 4 · 2014-10-14T01:32:00

Solution 2

Hi ,

I am not sure what is your requirement , try the below options.

Add reference to System.Web.Service assembly and define the code behind methods as Public methods , then attached Web Methods attribute to expose it.

C#

using System.Web.Services;

namespace WebApplication1
{
    public partial class WebForm1 : System.Web.UI.Page
    {


        [WebMethod]
        public void testc()
        {
            Label38.Text = "work";
        }

        [WebMethod]
        public void testd()
        {
            Label38.Text = "not work";
        }
    }
}

HTML code

XML

<head runat="server">
    <title></title>

    <script type="text/javascript">
        var myVar = setInterval(function () { myTimer() }, 1)
        function myTimer() {

           <%testc();%>

}
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label ID="Label38" runat="server" >Apple</asp:Label>
    </div>
    </form>
</body>
</html>

If you are satisfied with the reply please accept and close the question.

Posted 14-Oct-14 1:32am

Mathew Soji

Updated 14-Oct-14 1:33am

v2

Comments

VC.J 14-Oct-14 8:09am

Mathew in web methods how can we access page controls as you have use Label inside webmethod.

please see the link
http://forums.asp.net/t/1531113.aspx?How+to+get+page+controls+in+WebMethod+ASP+Net+2+0

Mathew Soji 14-Oct-14 9:55am

Please try the above code , It works .
Don't know your system environment , I am using VS2013 targeting .Net 4.5.

alienqueen 14-Oct-14 18:31pm

[WebMethod] not work. I use ASP.net 4.0. i use VS2013

If someone give me webmethod sample with files, i will try this. because web methods not work

VC.J 14-Oct-14 10:10am

ok, I have VS2010, but what my concern is webmethod has to be static and in static function how we are going to use controls(label button).

alienqueen 14-Oct-14 18:43pm

thanks a lot for all answers but not working. any idea?

VC.J 15-Oct-14 0:03am

I am giving you a sample how to use web method

alienqueen 15-Oct-14 4:55am

my visual studio doesn't see "PageMetods" when i write. if you have sample file about using "pagemethod" and "webmetods" i will try in my VS 2013 for testing. my e-mail is s_zkn@msn.com. send to me please