Forms, Inputs, and the FormData API

Description:
Intercept form submission events, configure HTML5 declarative constraints, evaluate ValidityState flags, wire accessible ARIA feedback, and extract structured payloads using the FormData API.

Chapters:
00:00 Intro
00:13 Intercepting Form Submissions
00:30 Form Submission and Extraction Pipeline
00:48 Form Submit vs Button Click
01:08 Declarative HTML5 Constraints
01:29 Programmatic Constraint Evaluation
01:50 Custom Validation with setCustomValidity
02:11 Accessible Error Feedback
02:29 Extracting Payloads with FormData
02:52 Trap: JSON.stringify(formData)
03:13 Client vs Server Validation
03:35 Trap: Missing Names and Disabled Fields
03:55 Trap: Named Property Shadowing
04:15 The WHATWG Form Submission Algorithm
04:38 Form Validation Suppression & Control
05:00 Core Takeaways
05:35 Practice: FormData Serialization
05:55 Practice: Clearing Custom Validity
06:16 Next Lesson