HOWTO: How To Read the Selected Items in a SELECT Control
ID: Q159757
|
1.00 1.10 2.00
WINDOWS
kbprg kbhowto
The information in this article applies to:
-
Microsoft Visual Basic, Scripting Edition, versions 1.1, 2.0
SUMMARY
This article demonstrates how to read what items are selected in a SELECT
control on a Web page using Visual Basic Script. Many reference documents
indicate that a SELECT control has a VALUE property. However, this is not
true. The SELECT control does not have a VALUE property, but the items in
the OPTIONS collection of the SELECT control do.
If you are not familiar with the SELECT control, it is similar to the
ListBox control in Visual Basic.
MORE INFORMATION
In order to read what item(s) are selected in a SELECT control, you must
loop through the elements, and then check if the current element is
selected. If it is selected, then you can perform an action.
Use a text editor, such as Notepad.exe, to copy the following sample HTML
code into an HTML file:
********* BEGIN Page1.HTM *******************
<HTML>
<SCRIPT LANGUAGE="VBSCRIPT">
Sub ShowVals
Dim SelStr
For i = 0 to Form1.myselect.length - 1
If Form1.myselect.options(i).selected = 1 Then
selstr = selstr & Form1.myselect.options(i).value & chr(10)
End If
Next
MsgBox SelStr,,"Selected Item(s)"
End Sub
</SCRIPT>
<BODY>
<FORM NAME="Form1">
<SELECT MULTIPLE NAME="MySelect">
<OPTION VALUE="10">Option 1 (10)
<OPTION VALUE="20">Option 2 (20)
<OPTION VALUE="30">Option 3 (30)
</SELECT>
<INPUT TYPE=BUTTON onClick="ShowVals()" VALUE="Show Value(s)">
</FORM>
</BODY>
</HTML>
********* BEGIN End.HTM *******************
Program Flow
- The onClick event of the button on the page calls the ShowVals
subroutine.
- The ShowVals subroutine creates a variable to hold the selected items
(SelStr).
- The "Form1.myselect.length" variable represents the number of items in
the list. The For loop uses this value to determine how many iterations
it needs in the loop.
- In each iteration of the loop the program checks to see if the current
item is selected.
- If the current item is selected, then its value is concatenated onto the
string described in step 2. "Chr(10)" is also added to the string, and
it evaluates to a carriage-return character for cosmetic purposes.
- A message box displays the string.
REFERENCES
For more information, please see the MSDN Web Workshop:
http://msdn.microsoft.com/workshop/default.asp
Additional query words:
1.00 kbdsi
Keywords : PrgCtrlsStd PrgObjMdlIE PrgSyntaxVBScript
Version : WINDOWS:1.1,2.0
Platform : WINDOWS
Issue type : kbhowto