August 2024
Intermediate to advanced
186 pages
4h 3m
English
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Input Validation with API Calls
Some input validation must be performed on the server. For example, when validating the setup of a new user that’s identified by their email address, it’s common to verify that the provided email address isn’t already in use by an existing user. This can be done as the user types instead of waiting for the form to be submitted.
The following HTML validates an email address as it’s typed. A GET request is sent to the /email-validate endpoints when a keyup event occurs.
The changed modifier states that a request should only be sent if the value of the input has changed. An example of a keyup event that doesn’t change the value is using the arrow keys to move the cursor within the input.
The delay modifier states ...
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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.