我有几个UpdatePanel的ASP.NET Web窗体,我想有只触发这些UpdatePanel的更新中的一个定时器。然后,我想要一个单独的UpdatePanel在一个DropDownList的OnSelectedIndexChanged事件更新。在code我将更新定时器触发面板就好了,但是当我更改索引,下拉触发面板会等到下一个计时器周期进行更新。怎样才可以有下拉触发面板会立即更新?低于code。
C#:
公共部分类WebForm2:System.Web.UI.Page{ 保护无效的Page_Load(对象发件人,EventArgs的发送) { } 保护无效Timer1_Tick(对象发件人,EventArgs的发送) { Label1.Text =UpdatePanel1刷新在:+ DateTime.Now.ToLongTimeString(); } 保护无效dropDown_indexChange(对象发件人,EventArgs的发送) { Label2.Text =UpdatePanel2刷新在:+ DateTime.Now.ToLongTimeString(); //UpdatePanel2.Update(); - 没有帮助 }}ASP:
<表ID =form1的=服务器>< DIV> < ASP:的ScriptManager ID =ScriptManager1=服务器>< / ASP:ScriptManager的> < BR /> < ASP:的UpdatePanel ID =UpdatePanel1=服务器的UpdateMode =条件> <&的ContentTemplate GT; < ASP:标签ID =Label1的=服务器文本=没有更新>< / ASP:标签> < ASP:定时器ID =定时器=服务器间隔=3000ontick =Timer1_Tick>< / ASP:定时器> < /&的ContentTemplate GT; <&触发器GT; < ASP:AsyncPostBackTrigger控件ID =定时器事件名称=嘀/> < /触发器> < / ASP:的UpdatePanel> < BR /> < ASP:的UpdatePanel ID =UpdatePanel2=服务器的UpdateMode =条件> <&的ContentTemplate GT; < ASP:标签ID =Label2的=服务器文本=还没有更新>< / ASP:标签> < /&的ContentTemplate GT; <&触发器GT; < ASP:AsyncPostBackTrigger控件ID =DropDownList1事件名称=的SelectedIndexChanged/> < /触发器> < / ASP:的UpdatePanel> < BR /> < BR /> < ASP:DropDownList的OnSelectedIndexChanged =dropDown_indexChangeID =DropDownList1=服务器> < ASP:列表项>这< / ASP:ListItem的> < ASP:ListItem的>这< / ASP:ListItem的> < ASP:列表项>在其它< / ASP:ListItem的> < / ASP:DropDownList的>< / DIV>< /表及GT;解决方案
移动你的DropDownList成一个UpdatePanel并设置 .AutoPostBack = TRUE 就可以了。
I have an ASP.NET web form with several UpdatePanels and I would like to have a timer that triggers only one of these UpdatePanels to update. I then want a separate UpdatePanel to update on the OnSelectedIndexChanged event of a DropDownList. The code I have will update the timer-triggered panel just fine, but when I change the index, the drop down-triggered panel will wait until the next timer tick to update. How can I have the drop down-triggered panel update instantaneously? Code below.
C#:
public partial class WebForm2 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Timer1_Tick(object sender, EventArgs e) { Label1.Text = "UpdatePanel1 refreshed at: " + DateTime.Now.ToLongTimeString(); } protected void dropDown_indexChange(object sender, EventArgs e) { Label2.Text = "UpdatePanel2 refreshed at: " + DateTime.Now.ToLongTimeString(); //UpdatePanel2.Update(); -- Didn't help } }ASP:
<form id="form1" runat="server"> <div> <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> <br /> <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:Label ID="Label1" runat="server" Text="not updated yet"></asp:Label> <asp:Timer ID="Timer1" runat="server" Interval="3000" ontick="Timer1_Tick"></asp:Timer> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" /> </Triggers> </asp:UpdatePanel> <br /> <asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:Label ID="Label2" runat="server" Text="also not updated yet"></asp:Label> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="DropDownList1" EventName="SelectedIndexChanged" /> </Triggers> </asp:UpdatePanel> <br /> <br /> <asp:DropDownList OnSelectedIndexChanged="dropDown_indexChange" ID="DropDownList1" runat="server"> <asp:ListItem>This</asp:ListItem> <asp:ListItem>That</asp:ListItem> <asp:ListItem>The Other</asp:ListItem> </asp:DropDownList> </div> </form>解决方案
Move your DropDownList into an UpdatePanel and set .AutoPostBack = true on it.
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