检测AutoCompleteExtender选择事件

Question

捕获AutoCompleteExtender select事件的最佳方法是什么,因为控件没有此事件？

这是我正在谈论的样本.我有两个带有链接AutoCompleteExtender控件的texbox(Location1TextBox,Location2TextBox).这部分效果很好.现在问题是当用户从任何AutoCompleteExtender中选择时我需要捕获此事件并尝试计算location1和location2之间的距离.结果应自动填充到DistanceTextBox.有什么好的sugesstions？我只是希望它不会以文本框的onchange事件结束......

    <asp:UpdatePanel ID="UpdatePanel2" runat="server">
        <ContentTemplate>
            <asp:Label ID="TitleLabel" runat="server" Text='<% $resources:AppResource,LocationStart %>'
                CssClass="OneColumnLabel"></asp:Label>:<br />
            <asp:TextBox ID="Location1TextBox" runat="server" CssClass="TwoColumnMiddleLongText"
                ValidationGroup="Edit" AutoPostBack="true"></asp:TextBox>*
            <asp:RequiredFieldValidator ID="TitleRequiredFieldValidator" runat="server" ControlToValidate="Location1TextBox"
                Display="None" ErrorMessage='<% $resources:AppResource,LocationRequired %>' ValidationGroup="Edit"></asp:RequiredFieldValidator>
            <ajaxToolkit:AutoCompleteExtender runat="server" ID="AutoCompleteExtender1" TargetControlID="Location1TextBox"
                ServiceMethod="GetCompletionList" ServicePath="TravelOrder.aspx" MinimumPrefixLength="1"
                CompletionInterval="300" UseContextKey="True">
            </ajaxToolkit:AutoCompleteExtender>
            <asp:Label ID="Label7" runat="server" Text='<% $resources:AppResource,LocationArrival %>'
                CssClass="OneColumnLabel"></asp:Label>:<br />
            <asp:TextBox ID="Location2TextBox" runat="server" CssClass="TwoColumnMiddleLongText"
                ValidationGroup="Edit"></asp:TextBox>*
            <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="Location2TextBox"
                Display="None" ErrorMessage='<% $resources:AppResource,LocationRequired %>' ValidationGroup="Edit"></asp:RequiredFieldValidator>
            <ajaxToolkit:AutoCompleteExtender runat="server" ID="AutoCompleteExtender2" TargetControlID="Location2TextBox"
                ServiceMethod="GetCompletionList" ServicePath="TravelOrder.aspx" MinimumPrefixLength="1"
                CompletionInterval="300" UseContextKey="True">
            </ajaxToolkit:AutoCompleteExtender>
            <asp:Label ID="Label8" runat="server" Text='<% $resources:AppResource,Distance %>'
                CssClass="OneColumnLabel"></asp:Label>:<br />
            <asp:TextBox ID="DistanceTextBox" runat="server" CssClass="OneColumnText" ValidationGroup="Edit"></asp:TextBox>*
            <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="DistanceTextBox"
                Display="None" ErrorMessage='<% $resources:AppResource,DistanceRequired %>' ValidationGroup="Edit"></asp:RequiredFieldValidator>
        </ContentTemplate>
    </asp:UpdatePanel>

Answer 1

您可以AutoPostBack="true"从目标文本框中删除,订阅TextChanged事件并使用下面的函数作为itemSelected extender的客户端事件的处理程序OnClientItemSelected="autoCompleteEx_ItemSelected":

<script type="text/javascript">
     function autoCompleteEx_ItemSelected(sender, args) {
          __doPostBack(sender.get_element().name, "");
     }
</script>