ModalPopupExtender - 如何仅在满足某些条件时显示? [英] ModalPopupExtender - how to show only when certain conditions are met?

问题描述

我正在使用 ModalPopupExtender.Onclick按钮(这是ModalPopupExtender的TargetControlID)，调用检查某些条件的javascript.我的要求是，只有在某些条件为真时才显示弹出窗口，否则隐藏它.

I am working with ModalPopupExtender. Onclick of button (which is TargetControlID of ModalPopupExtender), calls javascript which checks for some conditions. My requirement is, i want to show popup only if certain condition is true, otherwise hide it.

这是代码.隐藏功能在这里不起作用.即使调用 hide() 也会出现弹出窗口.

Here is the code. Hide function is not working here. Popup appears even if hide() is called.

function ShowAlert()
{
    if (selBtn == "" || selBtn == null)
    {
        alert("Please select scrip/scheme first");
        var modalPopup = $find('<%=ModalPopupExtender2.ClientID %>');
        if (modalPopup != null)
        {
            modalPopup.hide();
        }
        return false;
    }
}

-----------------------------------------------

<table width="100%" border="0" cellpadding="0" cellspacing="0">
   <tr>
     <td valign="top" align="center">
       <asp:Button ID="btnSet" runat="server" Text="Set Alerts" OnClientClick="ShowAlert();" />
       <cc1:ModalPopupExtender ID="ModalPopupExtender2" runat="server" BehaviorID="ModalBehaviour2" TargetControlID="btnSet" PopupControlID="pnlPopupU" DropShadow="false" X="100" Y="200" BackgroundCssClass="Inactive"></cc1:ModalPopupExtender>
     </td>
   </tr>
</table>

推荐答案

在代码后面你可以:

if (true)
{
var script = @"Sys.Application.add_load(function() { $find('behavoirIDModal').show(); });";
ScriptManager.RegisterStartupScript(this, GetType(), "ShowPopup", script, true);
}

并在 aspx 中创建:

and in aspx you make:

   <asp:Panel runat="server" ID="pnlSalvo">
        <asp:Button ID="btnClose" runat="server" Text="Fechar" />
    </asp:Panel>
    <ajaxToolkit:ModalPopupExtender ID="ModalResultado" BehaviorID="acao" runat="server" PopupControlID="pnlSalvo"
        TargetControlID="btnShow"
        CancelControlID="btnClose">
    </ajaxToolkit:ModalPopupExtender>
    <asp:Button ID="btnShow" runat="server" Text="Modal" Visible="true"  />

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