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TypeScript DOM Manipulation

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TypeScript DOM Manipulation

What is DOM in TypeScript?

TypeScript provides type definitions for DOM APIs, allowing safe interaction with HTML elements.

Selecting Elements

TypeScriptRead-only
1
const el = document.getElementById('app');

Type Assertion

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1
const input = document.getElementById('name') as HTMLInputElement;
input.value = 'Hello';

querySelector

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1
const btn = document.querySelector('button') as HTMLButtonElement;

Event Handling

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1
btn.addEventListener('click', (e: MouseEvent) => {
  console.log('Clicked');
});

Null Safety

TypeScriptRead-only
1
const el = document.getElementById('app');
if (el) {
  el.textContent = 'Hello';
}

Working with Forms

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1
const form = document.querySelector('form') as HTMLFormElement;
form.addEventListener('submit', (e) => {
  e.preventDefault();
});

Best Practices

  • Use type assertions for elements
  • Handle null values properly
  • Use correct event types
  • Avoid unsafe DOM access

Common Mistakes

  • Ignoring null checks
  • Incorrect type casting
  • Using any for elements
  • Not specifying event types

Conclusion

TypeScript DOM support ensures safer and more reliable interaction with web page elements.

Try it yourself

const el = document.getElementById('app') as HTMLElement;

Test Your Knowledge

Q1
of 3

DOM used for?

A
Styling
B
HTML manipulation
C
Routing
D
API
Q2
of 3

Type assertion syntax?

A
as
B
is
C
:
D
=
Q3
of 3

Event type?

A
MouseEvent
B
String
C
Number
D
Array

Frequently Asked Questions

What is DOM?

Document Object Model.

Why type assertion?

To specify element type.

How to handle null?

Check before use.

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ts declaration files

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ts events

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