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Creates a combo box, which initially displays a single item. However, when you select the combo box, it displays a list of items that you can choose an item from. A combo box combines the features of a text box and a list box. You can enter information in the text box portion or select an item from the list box portion of the control.
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| The Style property determines the type of list that the ComboBox control contains. To create a drop-down combo box, which displays a drop-down list and edit box, set the Style property to 0. To create a drop-list box, which displays a drop-down list only, set the Style property to 2. |
To show or hide the list in a combo box, select the control and press ALT+DOWN ARROW.
For information about creating ComboBox controls, see Form Designer and Using Controls.
ComboBox |
Remarks
The following table lists properties commonly set at design time.
| Property | Description |
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Determines the number of columns in the list. |
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Specifies where to store the value that the user chooses from the list. |
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Specifies whether to display mover bars to the left of the items in the list so that a user can rearrange the item order. |
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Specifies whether the user can select more than one item in the list. |
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Specifies the source of the values displayed in the list. |
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Specifies the type of the source of the values displayed in the list. |
The following table lists methods commonly used.
| Method | Description |
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Adds an item to the list when RowSourceType is set to 0. |
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Removes an item from the list when RowSourceType is set to 0. |
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Updates the list if the values in the source specified by RowSource have changed. |
The backslash ("\") is treated as a special character when used in the expression for an item. The following rules apply for this character
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You can disable an item in a list box or combo box by adding a single backslash to the beginning of the expression.
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Any multiple of two backslashes used in the expression is displayed as a single backslash. For example, one or two backslashes used together display as one, and three or four backslashes together display as two. The following example code contains a list box item containing a Universal Naming Convention (UNC) path. The code displays in the list box as
\\MyServer\MyMachine\MyFolder.
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Copy CodeMyForm.List1.AddItem("\\\\MyServer\\MyMachine\\MyFolder") -
If the expression begins with multiple backslashes, the item is not disabled. If you want to disable an item that begins with multiple backslashes, add a backslash and a close bracket (]) to the beginning of the item. For example, the following would disable the UNC path item in the list box.
В Copy CodeMyForm.List1.AddItem("\]\\\MyServer\\MyMachine\\MyFolder") -
To include a separator line use a backslash followed by a hyphen as the item to add to the list box. For example, the following code adds a separator line to a list box.
В Copy CodeMyForm.List1.AddItem("\-")
You can also use an ActiveX control that adds extra characteristics, such as a Checkbox control, to the ListView or TreeView controls.