如何在组合框中选择项目时显示隐藏的文本框

Question

我有一个包含5个不同选项的组合框，＆＃34;一个玩家＆＃34;，＆＃34;两个玩家＆＃34;，＆＃34;三个玩家＆＃34;我的要求是当用户从组合框中选择某些东西时，它们的等效文本框应该变得可见，即如果＆＃34;一个玩家＆＃34;选中后，应出现一个文本框，以便用户输入值。两个和三个相同。请建议。

Answer 1

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
    If ComboBox1.Text.Trim.Contains("Player 1") = True Then
        TextBox1.Visible = True
        TextBox2.Visible = False
        TextBox3.Visible = False
    ElseIf ComboBox1.Text.Trim.Contains("Player 2") = True Then
        TextBox1.Visible = True
        TextBox2.Visible = True
        TextBox3.Visible = False
    ElseIf ComboBox1.Text.Trim.Contains("Player 3") = True Then
        TextBox1.Visible = True
        TextBox2.Visible = True
        TextBox3.Visible = True
    End If
End Sub

Answer 2

只需将jquery（https://api.jquery.com/change/）中可用的.change（）函数与css可见性（visibility：hidden / visible; check http://www.w3schools.com/cssref/pr_class_visibility.asp）

组合在一起

$( "#myComboBox" ).change(function() {
  //do what you have to do here
});

Answer 3

尝试这样的事情：

Sub cbC(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
    Select Case ComboBox1.SelectedIndex
        Case 0
            TextBox1.Visible = False
            TextBox2.Visible = False
        Case 1
            TextBox1.Visible = True
            TextBox2.Visible = False
        Case 2
            TextBox1.Visible = True
            TextBox2.Visible = True
    End Select
End Sub

或者根据更适合您需求的内容：

Sub cbC(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
    TextBox1.Visible = (ComboBox1.SelectedIndex = 0)
    TextBox1.Visible = (ComboBox1.SelectedIndex = 1)
End Sub

Answer 4

TextBox1.Visible = (ComboBox1.SelectedIndex = 0)完美无缺。

您还必须确保在文本框和标签的“属性”下将“可见”设置为“False”。否则，在运行应用程序时，文本框最初将可见。