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Editorial Team
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Asked: 2026-05-28T08:25:50+00:00

I am trying to create an add to ‘favourites’button. When the user clicks this

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I am trying to create an add to ‘favourites’button. When the user clicks this button the image has to be changed ( in js). After that I would like to do a postback the asp.net page? how can I make this work? sofar i got:

aspx

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function () {

            function ChangeFavStar() {
                if ($("#btnAddToFavs").attr('src') == 'starempty.jpg') {
                    $("#btnAddToFavs").attr('src') = 'staradded.jpg';
                }
                else {
                    $("#btnAddToFavs").attr('src') = 'starempty.jpg';
                }
                return true;
            }

        });

    </script>
    <style type="text/css">
        #btnAddToFavs {
            height: 79px;
            width: 121px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:ImageButton ID=btnAddToFavs runat=server 
            OnClientClick="ChangeFavStar();" ImageUrl="~/starempty.jpg"
             Height="74px" Width="109px"  />

    </div>
    </form>
</body>
</html>

cs behindcode

 protected void btnAddToFavs_Click(object sender, ImageClickEventArgs e)
        {
            //do stuff
        }
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1 Answer

  1. Editorial Team

    You may invoke JavaScript function but changes on button wont be persisted because of postback. You have to change ImageUrl property via C# code.

     <script type="text/javascript">
      function ChangeFavStar() {
         if ($("#btnAddToFavs").attr('src') == 'starempty.jpg') {
              $("#btnAddToFavs").attr('src') = 'staradded.jpg';
          }
          else {
              $("#btnAddToFavs").attr('src') = 'starempty.jpg';
          }
      }
    </script>

    Markup:

    <form id="form1" runat="server">
    <div>
    <asp:ImageButton ID="btnAddToFavs" runat=server 
            OnClientClick="ChangeFavStar();" ImageUrl="~/starempty.jpg"
             Height="74px" Width="109px"  />
    </div>
</form>
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