PRM –beginRequest事件

PRM –beginRequest事件
•参数类型:BeginRequestEventArgs
–request属性:用于获得WebRequest对象(用于请求的信息)
–postBackElement:触发异步刷新的DOM元素
•常用操作:
–读取请求信息
–改变请求方式(替换Executor)
–显示更新提示


强制显示UpdateProgress
aspx
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    
<ContentTemplate>
        
<%= DateTime.Now %><br />
        
<asp:Button ID="Button1" runat="server" Text="Button1" OnClick="Button_OnClick" />
    
</ContentTemplate>
    
<Triggers>
        
<asp:AsyncPostBackTrigger ControlID="Button2" />
    
</Triggers>
</asp:UpdatePanel>

<asp:UpdateProgress ID="UpdateProgress1" runat="server" DisplayAfter="0" DynamicLayout="false"
    AssociatedUpdatePanelID
="UpdatePanel1">
    
<ProgressTemplate>
        
<span style="color:Red">Loading</span>
    
</ProgressTemplate>
</asp:UpdateProgress>

<hr />
<asp:Button ID="Button2" runat="server" Text="Button2" OnClick="Button_OnClick" />


<script language="javascript" type="text/javascript">
    Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(
        function(sender, e)
        {
            
if (e.get_postBackElement().id != "<%= this.Button2.ClientID %>")
            {
                
return;
            }
            
            var updateProgress 
= $get("<%= this.UpdateProgress1.ClientID %>");
            var dynamicLayout 
= <%= this.UpdateProgress1.DynamicLayout.ToString().ToLower() %>;
            
            
if (dynamicLayout)
            {
                updateProgress.style.display 
= "block";
            }
            
else
            {
                updateProgress.style.visibility 
= "visible";
            }
        });
</script>

</asp:Content>
cs
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    
protected void Button_OnClick(object sender, EventArgs e)
    {
        Thread.Sleep(
2000);
    }
原文地址:https://www.cnblogs.com/timy/p/1169840.html