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forms-validation

Forms and validation

Last reviewed May 28, 2026 Content v20260528
Track mode
client_angularjs
Means
In-browser AngularJS 1.x
Reading
~1 min
Level
intermediate

This lesson

This lesson teaches Forms and validation: the concepts, APIs, and habits you need before advancing in AngularJS.

Forms are where UX and validation meet—controlled inputs are the React default for predictable state.

You will apply Forms and validation in contexts like: Long-lived intranet apps, government portals, and codebases not yet moved to Angular, React, or Vue.

Write JavaScript for AngularJS 1.8, click Run—register modules/controllers, then mountApp(moduleName, templateHtml) in #ng-app; printOutput feeds the terminal.

When you can explain the previous lesson's ideas without copying starter code.

ng-required, ng-pattern, and form.$invalid gate submits in template-driven legacy forms.

Important interview questions and answers

  1. Q: Why does this matter?
    A: ng-required, ng-pattern, and form.$invalid gate submits in template-driven legacy forms.

Self-check

  1. Summarize Forms and validation in one sentence.
  2. What would you try next in the playground?

Challenge

Forms and validation hands-on

  1. Edit the default code.
  2. Click Run in browser.
  3. Confirm preview or terminal output.

Done when: preview or terminal matches the lesson goal.

Challenge

Invalid email submit

  1. Submit empty email—terminal shows valid:false.
  2. Enter a valid email and submit again.

Done when: terminal shows valid:false then valid:true.

Interview prep

How block invalid submit?

Use ng-disabled="form.$invalid" or check form.$valid inside ng-submit handler.

Interview tip Lesson completion confidence

Can you explain this lesson in 30 seconds without reading notes?

Not saved yet.

Playground

Runs in your browser in a sandboxed frame. Backend runners appear when this track’s profile allows them.

Check yourself

Multiple choice — immediate feedback.

Discussion

Past discussion is visible to everyone. Only logged-in users can post comments and replies.

Starter discussion topics

  • ng-invalid class?
  • Custom validator?

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