我发现了很多解决方案,但没有一个在我的方案中不起作用。 我已经创建了一个测试项目来演示我的概念。updatepanel和javascript include文件
基本上,有承载用户控件的页面...
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<uc1:WebUserControl1 ID="WebUserControl11" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
<br />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</div>
</form>
WebUserControl1具有下拉列表和另外两个webusercontrols(基于下拉列表元素的选择要被显示)的内部更新面板如下。隐藏文件WebUserControl1是
<%@ Register Src="WebUserControl2.ascx" TagName="WebUserControl2" TagPrefix="uc2" %>
<%@ Register Src="WebUserControl3.ascx" TagName="WebUserControl3" TagPrefix="uc3" %>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="DropDownList1" runat="server"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"
AutoPostBack="True">
</asp:DropDownList>
<asp:Panel ID="pnlCreditCard" Visible="false" runat="server">
<uc2:WebUserControl2 ID="WebUserControl21" runat="server" />
</asp:Panel>
<asp:Panel ID="pnlGiftCard" Visible="false" runat="server">
<uc3:WebUserControl3 ID="WebUserControl31" runat="server" />
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
代码.....
public enum PaymentMethod
{
CreditCard = 0,
GiftCard
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
BindPaymentMethods(Enum.GetValues(typeof(PaymentMethod)));
}
private void BindPaymentMethods(Array paymentMethods)
{
DropDownList1.DataSource = paymentMethods;
DropDownList1.DataBind();
if (paymentMethods.Length > 0)
{
DropDownList1.SelectedIndex = 0;
UpdateCreditOrGiftCardPanelVisibility();
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
UpdateCreditOrGiftCardPanelVisibility();
}
private void UpdateCreditOrGiftCardPanelVisibility()
{
if(DropDownList1.SelectedValue == Enum.GetName(typeof(PaymentMethod),PaymentMethod.CreditCard))
{
pnlGiftCard.Visible = false;
pnlCreditCard.Visible = true;
}
else if (DropDownList1.SelectedValue == Enum.GetName(typeof(PaymentMethod), PaymentMethod.GiftCard))
{
pnlCreditCard.Visible = false;
pnlGiftCard.Visible = true;
}
}
现在,问题就在这里开始...有一个外部JavaScript文件[JScript1.js](内嵌资源),这基本上是用来显示一个警告框。
<script language="javascript" type="text/javascript">
window.onload = function() {
alert('creditcard form');
}
WebUserControl2.ascx.cs代码背后,是当我改变下拉列表的值没有显示
protected void Page_Load(object sender, EventArgs e)
{
ScriptManager.RegisterClientScriptInclude(this.Page, this.Page.GetType().BaseType, "JScript1", Page.ClientScript.GetWebResourceUrl(this.Page.GetType().BaseType, "WebApplication1.JScript1.js"));
}
警报窗口。即使脚本也被注册了三次(看看firebug) 由于原始JS文件太大,需要使用ScriptInclude而不是ScriptBlock。
可以通过电子邮件的测试程序....
由于提前