【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：

 <ComponentArt:PageView ID="workstationPageView1" runat="server">
                        <h3>
                            <%=Resources.Base.WorkstationName%></h3>
                        <div>
                            <%--value="<%=Resources.Base.Add%>"--%>
                            <asp:TextBox ID="workstationName" runat="server" MaxLength="50" Width="300px" CssClass="required"></asp:TextBox>
                            <input id="byNameOk" type="button" runat="server" value="<%$Resources:Base,Add %>"
                                onclick="byNameCallbackClick()" style=" 80px" />
                            <input type="button" value="<%=Resources.Base.Close%>" onclick="closePopupDialog(true)"
                                style=" 80px" />
                        </div>
                        <br />
                        <div>
                            <ComponentArt:CallBack ID="byNameCallback" runat="server">
                                <Content>
                                     
                                </Content>
                                <ClientEvents>
                                    <CallbackComplete EventHandler="byNameCallback_Complete" />
                                    <CallbackError EventHandler="byNameCallback_Error" />
                                </ClientEvents>
                            </ComponentArt:CallBack>
                        </div>
            <br />
            <div id="msg" class="MessageBottomDivStyle" style="overflow: auto;  95%; height: 150px">
            </div>
            <div>
               <asp:HiddenField ID="hidMessage" runat="server" />
            </div>
            </ComponentArt:PageView>

前端JS代码片段

        function byNameCallback_Complete(sender, args) {
            //var temMsg = $("#hidMessage").val();
           // var tempMessage = document.getElementById("hidMessage").value;
            var temMsg = document.getElementById('<%= hidMessage.ClientID %>').value;
            
            //var tempMessage = $("#<%=hidMessage.ClientID%>").val();
            if (errorMsg == "") {
                if (temMsg == "") {
                    $(msgDiv).toggleClass("successMsg");
                    $(msgDiv).html("<%=Resources.Base.Changessaved%>");
                }
                else {
                    $(msgDiv).toggleClass("failMsg");

                    $(msgDiv).html("<%=Resources.Base.OperationFailed %> " + "<br/>" + temMsg);
                }
            }
            else {
                $(msgDiv).toggleClass("failMsg");

                $(msgDiv).html("<%=Resources.Base.OperationFailed %> " + "<br/>" + errorMsg);

            }
            window.document.getElementById("byNameOk").disabled = false;
        }

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);

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

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。