Calling server side event in asp.net from java scr

问题:

Surely will be marked as duplicate one but after tons of question and example i couldn't solve my problem.
What i want?
Calling server side event handler in asp.net from client side java script it is not going on server side. I checked it by setting breakpoint, the page flicks but server side method is not called.
My click event on code behind is

  protected void btninsert_Click(object sender, EventArgs e)
  {
      // my code
  }

aspx file

   <asp:Button ID="btninsert" runat="server" ValidationGroup="form" CssClass="btn"
      OnClientClick="DoPost()" Text="Save" />

Javascript method is

   function DoPost() {
        function DoPost() {
        var chk = document.getElementById('<%= chkstatus.ClientID %>');
        if (chk.checked)
            __doPostBack('<%= btninsert.ClientID %>', 'OnClick');
        return true;
        //return false;
    } 
    } 

I also tried this __doPostBack('btninsert', 'OnClick'); and __doPostBack('btninsert', ''); and $('btnSubmit').trigger('click'); with no success.

What am i doing wrong?

Edit: If i uses OnClick event then it is going in the server side event irrespective of the if condition in the DoPost method.

回答1:

Ahh it was simple. Thanks to all answers.
Solution:
Use OnClick attribute for server side event and OnClientclick for client event for validation. OnClientClick javascript method will return true and false which decides whether serverside onclick event will fire or not.
Code will be somthing like this

  <script type="text/javascript">
    function DoPost() {
        var chk = document.getElementById('<%= chkstatus.ClientID %>');
        if (chk.checked) {
            var c = confirm("are you sure?");
            if (c == true) {
                return true;
            } else
            { return false; }
        }
        return true;
    } 
</script>

And the Button tag

<asp:Button ID="btninsert" runat="server" ValidationGroup="form" CssClass="btn"
   OnClientClick="return DoPost();" OnClick="btninsert_Click" Text="Save" />

回答2:

<asp:Button ID="btninsert" runat="server" ValidationGroup="form" CssClass="btn" OnClick="btninsert_Click" OnClientClick="DoPost()" Text="Save" />

Add OnClick="btninsert_Click", because without this information, asp.net has no way know which event handler to run for the "Click" event. In case you want to control whether to post back by client side script. You can do something like this:

<asp:Button ID="btninsert" runat="server" ValidationGroup="form" CssClass="btn" OnClick="btninsert_Click" OnClientClick="return DoPost()" Text="Save" />

function DoPost() {
        __doPostBack('<%= btninsert.ClientID %>', 'OnClick');
        return true;
      //return false;
    } 

Note the OnClientClick="return DoPost()"

回答3:

it can work!!

if you call __doPostBack('btninsert', ''), add below to Page_Load

 protected void Page_Load(object sender, EventArgs e)
{
    if ( Request["__EVENTTARGET"] == "btninsert" ) {
        btninsert_Click(sender, e);
    }
}

回答4:

<asp:Button ID="btninsert" runat="server" ValidationGroup="form" CssClass="btn"
      OnClientClick="return DoPost();" Text="Save" />

modify your line like this

回答5:

You can try Ajax, by using Webmethod. I used this in my project and it works fine! You may see the question, solutions and code here: http://www.codeproject.com/Questions/416748/How-to-Call-WebMethod-of-Csharp-from-JQuery

回答6:

Use ASP link button instead of ASP BUTTON. Button control is not called from javascript because it type is submit while link button type is button.

For example i have added two asp control

        <asp:LinkButton ID="lbtest" runat="server" Text="Link Button"></asp:LinkButton>
        <asp:Button runat="server" ID="btnbutton" Text="Button" /> 

and execute the page When we view the source of running page its look like this

        <a id="lbtest" href="javascript:__doPostBack('lbtest','')">Link Button</a>
        <input type="submit" name="btnbutton" value="Button" id="btnbutton" />