June 2023
Intermediate to advanced
250 pages
4h 40m
English
Content preview from Svelte with Test-Driven Development
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5
Validating Form Data
Now that our system is accepting new birthdays, we need to validate the data coming in. In this chapter, we’ll see how we can test-drive the SvelteKit fail function to return useful information to the user so that they can correct any errors.
Figure 5.1 shows what is displayed to the user after the server has deemed their date of birth invalid. Notice how the invalid form data is maintained so that the user has a chance to correct it:
Figure 5.1 – A validation error is shown when entering an invalid date
This chapter covers the following key topics:
- Adding a Playwright test for validating form errors
- Displaying SvelteKit ...
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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.