Two-way binding

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 Two-way binding: the concepts, APIs, and habits you need before advancing in AngularJS.

Without Two-way binding, you will struggle to read or extend AngularJS codebases and playground exercises.

You will apply Two-way binding 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-model synchronizes input controls with scope properties; combined with validation directives for forms.

Important interview questions and answers

Q: Why does this matter?
A: ng-model synchronizes input controls with scope properties; combined with validation directives for forms.

Self-check

Summarize Two-way binding in one sentence.
What would you try next in the playground?

Challenge

Two-way binding hands-on

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

Done when: preview or terminal matches the lesson goal.

Tip: Prefer one-way data flow in new patches; use ng-model where legacy forms require two-way sync.

Interview prep

What does ng-model do?: Syncs form control value with scope property and participates in validation state on the form controller.

Playground

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

Discussion

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

Starter discussion topics

ng-model flow?
When avoid two-way?

No discussion yet. Be the first to ask a question.