Question

我们已经使用CascadingDropDown来填充下拉列表。发生回发时，将自动触发下拉菜单的客户端更改事件。这是Firefox 65的特定行为。在chrome中，仅当用户从下拉菜单中手动选择值时，才会触发此事件。

有人可以帮助我解决此问题吗？

这是代码。

protected void btn1_Click(object sender, EventArgs e)
{
   cdlCountries.SelectedValue = "2";
   cdlStates.SelectedValue = "4";
}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CS.aspx.cs" Inherits="CS" EnableEventValidation="false" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <title></title>
    <style type="text/css">
        body
        {
            font-family: Arial;
            font-size: 10pt;
        }
    </style>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#<%=ddlCities.ClientID%>").change(function () {
                alert("");
            });
        });

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </cc1:ToolkitScriptManager>
        
    <table>
        <tr>
            <td style="width: 80px">
                Country:
            </td>
            <td>
                <asp:DropDownList ID="ddlCountries" runat="server" Width="150">
                </asp:DropDownList>
                <cc1:CascadingDropDown ID="cdlCountries" TargetControlID="ddlCountries" PromptText="Select Country"
                    PromptValue="" ServicePath="ServiceCS.asmx" ServiceMethod="GetCountries" runat="server"
                    Category="CountryId" LoadingText="Loading..." EnableAtLoading="false" />
                <asp:Button ID ="btn1" runat="server" OnClick="btn1_Click" Text="Submit" />
            </td>
        </tr>
        <tr>
            <td>
                State:
            </td>
            <td>
                <asp:DropDownList ID="ddlStates" runat="server" Width="150">
                </asp:DropDownList>
                <cc1:CascadingDropDown ID="cdlStates" TargetControlID="ddlStates" PromptText="Select State"
                    PromptValue="" ServicePath="ServiceCS.asmx" ServiceMethod="GetStates" runat="server"
                    Category="StateId" ParentControlID="ddlCountries" LoadingText="Loading..." EnableAtLoading="false"/>
            </td>
        </tr>
        <tr>
            <td>
                City:
            </td>
            <td>
                <asp:DropDownList ID="ddlCities" runat="server" Width="150">
                </asp:DropDownList>
                <cc1:CascadingDropDown ID="cdlCities" TargetControlID="ddlCities" PromptText="Select City"
                    ServicePath="ServiceCS.asmx" ServiceMethod="GetCities" runat="server"
                    Category="CityId" ParentControlID="ddlStates" />
            </td>
        </tr>
    </table>
    </form>
</body>
</html>

在Firefox中打开它>>单击“提交”按钮>>它调用不应更改的城市更改事件。

CascadingDropDown在加载时触发更改事件

0 个答案: