在组合框项目的帮助下显示/隐藏另一个组合框 [英] show/hide another combobox, with the help of combobox items

问题描述

我有一个小问题，我正在创建一个简单的搜索应用程序，它有一个文本框、一些组合框、单选按钮和一个搜索按钮.单选按钮名称视频"、音频"、图片"等.when radiobutton of video is selected, a combobox is appear having options "YouTube", "Metacafe" etc我希望当我单击视频组合框中的Metecafe"项目时，会出现另一个组合框，其中包含娱乐"、操作方法"、+18"等(视频搜索类别)等项目.所以如何在组合框项目的帮助下显示/隐藏其他 COBOBOX"希望你明白我的问题.屏幕截图我不知道这是否可能，因为我是 VB 初学者我的英语不是很好，所以请看下面的代码:)

I have a little problem that i'm creating a simple search application which have a TEXT box and some combo boxes and radio buttons and a search button. radio button names "Videos", "Audios", "Pics" etc.. when radiobutton of video is selected, a combobox is appear having options "YouTube", "Metacafe" etc I want that when i click "Metecafe" item in combobox of video, an other combo box appear having items Like "Entertainment", "How To", "+18" etc(categories of video search). so "HOW TO SHOW/HIDE AN OTHER COBOBOX WITH THE HELP OF A COMBOBOX ITEM" hope you have understood my problem. screen shoot i don't know it is possible or not becux i'm beginner in VB my English is not so good so please see below code:)

if combobox1.SelectedItem = "PAKISTAN" Then
    combobox2.Visible = True
End if

if combobox1.SelectedItem = "INDIA" Then
    combobox3.visible = true
    combobox2.visible = false
 End if

显然这段代码是错误的，这是我想要做的一个例子提前谢谢大家..

Obviously this code is wrong, this is a example that what i want to do Thanks to all in advance..

注意:我试过这个代码，但它不起作用..

NOTE: i have try this codes but its not working..

if ComboBox1.Items(ComboBox1.SelectedIndex).ToString() = "PAKISTAN" Then

    ComboBox2.Visible = True

End if

抱歉拼写和语法错误:(

sorry for spell and grammatical mistakes:(

推荐答案

尝试使用 SelectedItem 这样的属性

Try using the SelectedItem Property like this

Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
    If ComboBox1.SelectedItem.ToString = "PAKISTAN" Then
        ComboBox2.Visible = True
    End If
End Sub

由于您要检查多个国家/地区，您可以使用 选择案例 这样的声明

Since you are wanting to check for multiple country's you can use a Select Case Statement like this

Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged

    Select Case ComboBox1.SelectedItem.ToString
        Case "PAKISTAN"
            ComboBox2.Visible = True
            ComboBox3.Visible = False
        Case "INDIA"
            ComboBox3.Visible = True
            ComboBox2.Visible = False
        Case Else
            ComboBox2.Visible = False
            ComboBox3.Visible = False
    End Select
End Sub

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