Many THanks for this clear explanation, Razzak! David Blocker [EMAIL PROTECTED] 781-784-1919 Fax: 781-784-1860 Cell: 339-206-0261 ----- Original Message ----- From: "A. Razzak Memon" <[EMAIL PROTECTED]> To: "RBASE-L Mailing List" <[EMAIL PROTECTED]> Sent: Wednesday, December 01, 2004 1:01 PM Subject: [RBASE-L] - From the Edge: ComboBox vs. ListBox - What's the Difference?
> Wednesday, December 1, 2004 > > From the Edge: ComboBox vs. ListBox - What's the Difference? > Section: Form Database Controls > Chapter: Running R:BASE Your Way! > Platform: R:BASE 7.x/8.x for Windows > Build: 7.1.78.31123 and higher > > R:BASE 7.x/8.x for Windows offers the following Database > ComboBox and ListBox Controls: > > . DB Lookup ComboBox > . DB User Defined ComboBox > . DB Lookup ListBox > . DB User Defined ListBox > > So, what's the difference? Why would you use one instead of > the other? > > In general, it's all about the available real estate on your > form, as well as the look and feel of your R:BASE 7.x/8.x > applications. > > The ComboBox and ListBox controls have similar behaviors, > and in some cases may be interchangeable. There are times, > however, when one or the other is more appropriate for a > task. The ComboBox control is used to display data in a > drop-down ComboBox. When selected, the ComboBox control > opens, displaying a list of items from which you can > choose. > > Generally, a ComboBox is appropriate when there is a list > of suggested choices, and a ListBox is appropriate when you > want to limit input to what is on the list. The selection > height of the ListBox determines how many list items can > be selected at a time. For a ComboBox, you may also limit > the items by using the Drop-Down Count option. > > A ComboBox contains a text box field, so choices not on > the list can be typed in. The exception is when the > WALKMENU property is set to 'ON'. In that case, the > control will select an item if you type its first letter. > In addition, ComboBoxes save space on a form. Because the > full list is not displayed until the user clicks the down > arrow, a ComboBox can easily fit in a small space where > a ListBox would not fit. An exception is when the AUTODROP > setting is set to ON or AUTODROPDOWN property of the > ComboBox is set to 'TRUE'. In that case, the full list is > displayed, and the ComboBox takes up more room than a > ListBox would. > > The ListBox control displays a list of items from which > the user can select an item. If the total number of items > exceeds the number that can be displayed, a scroll bar is > automatically added to the ListBox control. When the > Multi-Column option is set to true (checked), the ListBox > displays items in multiple columns, separated by vertical > lines (if Show Lines option is checked) and a horizontal > scroll bar appears (if Show Horizontal Scroll Bar is > checked and Scroll Width nnnn is defined). When the > Multi-Column property is set to false (un-checked), the > ListBox displays items in a single column and a vertical > scroll bar appears. > > For complete details, features, supported PROPERTY > commands and tips for improving ComboBox and ListBox > performance, please visit: > > From The Edge: http://www.razzak.com/fte > (Powered by R:WEB Suite) > > Topic: ComboBox vs. ListBox - What's the Difference? > > Enjoy and make sure to have fun! > > Very Best R:egards, > > Razzak. > > --- RBASE-L > ================================================ > TO POST A MESSAGE TO ALL MEMBERS: > Send a plain text email to [EMAIL PROTECTED] > > (Don't use any of these words as your Subject: > INTRO, SUBSCRIBE, UNSUBSCRIBE, SEARCH, > REMOVE, SUSPEND, RESUME, DIGEST, RESEND, HELP) > ================================================ > TO SEE MESSAGE POSTING GUIDELINES: > Send a plain text email to [EMAIL PROTECTED] > In the message SUBJECT, put just one word: INTRO > ================================================ > TO UNSUBSCRIBE: > Send a plain text email to [EMAIL PROTECTED] > In the message SUBJECT, put just one word: UNSUBSCRIBE > ================================================ > TO SEARCH ARCHIVES: > Send a plain text email to [EMAIL PROTECTED] > In the message SUBJECT, put just one word: SEARCH-n > (where n is the number of days). In the message body, > place any > text to search for. > ================================================ >
