September 2005
Intermediate to advanced
576 pages
14h 23m
English
Content preview from Programming Visual Basic 2005Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Summary Validator
You have great control over how validation errors are reported. For example, rather than putting error messages alongside the control, you can summarize all the validation failures with a ValidationSummary
control. This control can place a summary of the errors in a bulleted list, a simple list, or a paragraph that appears on the web page or in a pop-up message box.
Add a ValidationSummary control at the bottom of the page (after the table). There are a few properties to set in the design view. Set the id to valSum (that becomes the ID of the validation summary control). Next set the DisplayMode by clicking on the Display Mode property. Notice that the various valid display modes are displayed in a drop-down list, as shown in Figure 9-8.
Interestingly, if you choose to set these attributes by hand, in Source Mode, IntelliSense helps you with the valid Display Modes as well, as shown in Figure 9-9. You can leave the default, BulletList, for now.
In addition to choosing among a BulletList, List, or SingleParagraph format for displaying the list of errors, you must decide on whether to show a summary at the bottom of the page and/or a pop-up message box. You configure this using the ShowMessageBox and ShowSummary properties, as shown in Figure 9-10.
Set ShowMessageBox to True and ShowSummary to False for now.
The HeaderText property holds the header that will be displayed if there are errors to report. Set it to The following errors were found:.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.