November 2011
Intermediate to advanced
384 pages
13h 23m
English
Content preview from HTML5: Your visual blueprint™ for designing rich web pages and applications
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REQUIRE A VALUE IN AN INPUT FIELD
You can use the new required input attribute to force the user to supply a value in any input field. Supported web browsers will pop up a simple message saying that the field is required if the user attempts to submit a blank value:
<input ... required>
The required attribute, when applied to an input element, activates the require-input feature in the user’s web browser, if supported.
One unfortunate problem with the require-input feature is that if multiple fields are required and missing a value, only the first one will receive the pop-up notification error. The user will need to correct the first problem and submit the form again before being notified of the second error.
To sidestep this issue, simply ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.