【原创】ComponentArt Callback

问题：服务端赋值给服务器控件 hidenfiled

AddWorkStation.aspx.cs 代码片段：

if (allWorkstations.Count >= licenseType.MaximumWorkstations)
{
　　　hidMessage.Value = "Lite Edition only allows you to add " + licenseType.MaximumWorkstations.ToString() + " workstaions in system!";
}

前端HTML代码片段：

 1  <ComponentArt:PageView ID="workstationPageView1" runat="server">
 2                         <h3>
 3                             <%=Resources.Base.WorkstationName%></h3>
 4                         <div>
 5                             <%--value="<%=Resources.Base.Add%>"--%>
 6                             <asp:TextBox ID="workstationName" runat="server" MaxLength="50" Width="300px" CssClass="required"></asp:TextBox>
 7                             <input id="byNameOk" type="button" runat="server" value="<%$Resources:Base,Add %>"
 8                                 onclick="byNameCallbackClick()" style=" 80px" />
 9                             <input type="button" value="<%=Resources.Base.Close%>" onclick="closePopupDialog(true)"
10                                 style=" 80px" />
11                         </div>
12                         <br />
13                         <div>
14                             <ComponentArt:CallBack ID="byNameCallback" runat="server">
15                                 <Content>
16                                      
17                                 </Content>
18                                 <ClientEvents>
19                                     <CallbackComplete EventHandler="byNameCallback_Complete" />
20                                     <CallbackError EventHandler="byNameCallback_Error" />
21                                 </ClientEvents>
22                             </ComponentArt:CallBack>
23                         </div>
24             <br />
25             <div id="msg" class="MessageBottomDivStyle" style="overflow: auto;  95%; height: 150px">
26             </div>
27             <div>
28                <asp:HiddenField ID="hidMessage" runat="server" />
29             </div>
30             </ComponentArt:PageView>

前端JS代码片段

View Code

 1         function byNameCallback_Complete(sender, args) {
 2             //var temMsg = $("#hidMessage").val();
 3            // var tempMessage = document.getElementById("hidMessage").value;
 4             var temMsg = document.getElementById('<%= hidMessage.ClientID %>').value;
 5             
 6             //var tempMessage = $("#<%=hidMessage.ClientID%>").val();
 7             if (errorMsg == "") {
 8                 if (temMsg == "") {
 9                     $(msgDiv).toggleClass("successMsg");
10                     $(msgDiv).html("<%=Resources.Base.Changessaved%>");
11                 }
12                 else {
13                     $(msgDiv).toggleClass("failMsg");
14 
15                     $(msgDiv).html("<%=Resources.Base.OperationFailed %> " + "<br/>" + temMsg);
16                 }
17             }
18             else {
19                 $(msgDiv).toggleClass("failMsg");
20 
21                 $(msgDiv).html("<%=Resources.Base.OperationFailed %> " + "<br/>" + errorMsg);
22 
23             }
24             window.document.getElementById("byNameOk").disabled = false;
25         }

前台 temMsg 取不到值

解决：

在后台AddWorkStation.aspx.cs 代码片段加入 hidMessage.RenderControl(e.Output);

View Code

1  if (allWorkstations.Count >= licenseType.MaximumWorkstations)
2                 {
3                     hidMessage.Value = "Lite Edition only allows you to add " + licenseType.MaximumWorkstations.ToString() + " workstaions in system!";
4                     hidMessage.RenderControl(e.Output);
5                 }

原因：由于使用了ComponentArt的Callback 控件，前台页面没有刷新，也就没有从后台取得数据，所以需要使用 hidMessage.RenderControl(e.Output) 将值发回给页面。