Question

我有一个动态构建的表单，具体取决于使用Ajax的用户选择（内置于带有UpdatePanel的.NET Ajax）。

如何在回发发生时插入“标准”ajax加载图标（可能将其附加到鼠标指针），然后在回发完成后将其删除？

如果有帮助，我确实安装了AjaxToolKit。

Answer 1

使用工具包的updateprogress：希望这会对你有所帮助

<asp:updatepanel id="ResultsUpdatePanel" runat="server">    
<contenttemplate>

<div style="text-align:center;">
    <asp:updateprogress id="UpdateProgress1" runat="server" associatedupdatepanelid="ResultsUpdatePanel" dynamiclayout="true">
                        <progresstemplate>

                           <img src="support/images/loading.gif">

                        </progresstemplate>
                    </asp:updateprogress>

                    </div>

 //your control code
</contenttemplate>
</asp:updatepanel>

Answer 2

使用以下代码......

 <html xmlns="http://www.w3.org/1999/xhtml">
 <head runat="server">
     <title></title>
 </head>
 <body>
    <form id="form1" runat="server">
     <div>
         <asp:ScriptManager ID="ScriptManager1" runat="server">
          </asp:ScriptManager>
    <asp:UpdateProgress ID="updProgress"
    AssociatedUpdatePanelID="UpdatePanel1"
    runat="server">
        <ProgressTemplate>            
        <img alt="progress" src="images/progress.gif"/>
           Processing...            
        </ProgressTemplate>
    </asp:UpdateProgress>

    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:Label ID="lblText" runat="server" Text=""></asp:Label>
            <br />
            <asp:Button ID="btnInvoke" runat="server" Text="Click" 
                onclick="btnInvoke_Click" />
        </ContentTemplate>
    </asp:UpdatePanel>         
      </div>
   </form>
  </body>
</html>


protected void btnInvoke_Click(object sender, EventArgs e)
{
    System.Threading.Thread.Sleep(3000);
    lblText.Text = "Processing completed";
}

Answer 3

这里我发现了一些JavaScript来自己制作更新过程，你也可以把它放在页面的任何地方，它可以在页面中的任何更新面板上工作。

<script type="text/javascript">
             // Get the instance of PageRequestManager.
             var prm = Sys.WebForms.PageRequestManager.getInstance();
             // Add initializeRequest and endRequest
             prm.add_initializeRequest(prm_InitializeRequest);
             prm.add_endRequest(prm_EndRequest);

             // Called when async postback begins
             function prm_InitializeRequest(sender, args) {
                 // get the divImage and set it to visible
                 var panelProg = $get('divImage');                
                 panelProg.style.display = '';
                 // reset label text
                 var lbl = $get('<%= this.lblText.ClientID %>');
                 lbl.innerHTML = '';

                 // Disable button that caused a postback
                 $get(args._postBackElement.id).disabled = true;
             }

             // Called when async postback ends
             function prm_EndRequest(sender, args) {
                 // get the divImage and hide it again
                     $('divImage').hide();                
                  // Enable button that caused a postback
                 $get(sender._postBackSettings.sourceElement.id).disabled = false;
             }
         </script>

Answer 4

<asp:UpdateProgress ID="updateProgress" runat="server">
            <ProgressTemplate>
                <div class="loading-panel">
                    <div class="loading-container">
                        <img src="<%= this.ResolveUrl("~/images/gears.gif")%>" />
                    </div>
                </div>
            </ProgressTemplate>
        </asp:UpdateProgress>
        <style>
            .loading-panel {
                background: rgba(0, 0, 0, 0.2) none repeat scroll 0 0;
                position: relative;
                width: 100%;
            }

            .loading-container {
                background: rgba(49, 133, 156, 0.4) none repeat scroll 0 0;
                color: #fff;
                font-size: 90px;
                height: 100%;
                left: 0;
                padding-top: 15%;
                position: fixed;
                text-align: center;
                top: 0;
                width: 100%;
                z-index: 999999;
            }
        </style>

从http://loading.io/

加载图片

带有UpdatePanel回发的ajax“加载”图标

4 个答案: