我需要有关视觉基本代码的帮助才能在下拉列表中显示项目 [英] I need help on visual basic code to display items on a drop down list

问题描述

您好，我正在尝试设计一个演示航空公司预订Web应用程序.请我有两个分别名为1和2的dropdownlist控件.两个dropdownlist都从数据库连接到数据源.如果dropdownlist1上有一个项目，我希望这样做如果选中它，它将仅显示数据库中dropdownlist2上的相关项目.让我说一下是否dropdownlist1包含离开城市的航班列表.我想当我单击列表中的一个项目时，它仅显示与该城市相关的所有飞行路线路线，我单击dropdownlist2.
我想要与此网站上的控件类似的东西 http://www. acn.aero/cgi-bin/airkiosk/I7/181002i?AJ=2&LANG=EN [

Hello please i am trying to design a demo airline reservation web application.please i have two dropdownlist controls named one and two respectively.Both drop downlist are connected to a data source from a databse.I want that if an item on dropdownlist1 is selected it will display only the related items on dropdownlist2 from the database.Let me say if dropdownlist1 contain a list of flight departing a city.I want when i click on an item in the list it displays all the flight route relating to only that route i click on dropdownlist2.
i want something similar to the control on this website http://www.acn.aero/cgi-bin/airkiosk/I7/181002i?AJ=2&LANG=EN[^]
the Leaving from drop list and the going to drop list
I really appreciate the efforts of anyone that can help me out i am a novice at visual basics

推荐答案

Private Sub dropdownlist1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles dropdownlist1.SelectedIndexChanged
                If Not Dropdownlist2() Then
                    Exit Sub
                End If

End Sub

当dropdownlist1选择索引更改时，绑定dropdownlist2
在dropdownlist2中，您可以添加dropdownlist1的过滤器，以便仅获取与dropdownlist1相关的项目.

Bind dropdownlist2 when dropdownlist1 selected index change
in dropdownlist2 you can add filter of dropdownlist1 so you get only those item which is related to dropdownlist1.

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