Ways to incorporate debounce time into an input search field in typescript

Question

Ways to incorporate debounce time into an input search field in typescript

Is there a way to incorporate debounce time into a dynamic search box that filters data in a table? I have explored some solutions online, but my code varies slightly as I do not use throttle or similar functions.

This is my template code:

<input matInput (keyup)="applyFilter($event.target.value)" placeholder="Search element">

And the TypeScript for it is:

applyFilter(filterValue: string) {
    this.tableDataSource.filter = filterValue.trim().toLowerCase();
}

I would like to implement a debounce time so that the search only occurs every 2 seconds, preventing multiple requests with every change.

Thank you in advance.

I attempted to invoke the method from another method using a pipe:

filterData(filterValue: string) {
    this.applyFilter(filterValue).pipe(debounceTime(2000))
}

However, it now displays an error stating pipe does not exist on type void.

javascript angular typescript

Answer 1

Answer №1

Snippet:

<input matInput (input)="searchKeywords.next($event.target.value)" type="text" 
  placeholder="Enter keywords to search">

Search Component:

private searchKeywords = new Subject<string>();

ngOnInit () {
  this.searchKeywords.pipe(
    debounceTime(400), // ignore terms typed within 400ms
    distinctUntilChanged() // only trigger when the term changes
  ).subscribe(keyword => {
    // perform search with the entered keyword
  });
}

Answer 2

Snippet:

<input matInput (input)="searchKeywords.next($event.target.value)" type="text" 
  placeholder="Enter keywords to search">

Search Component:

private searchKeywords = new Subject<string>();

ngOnInit () {
  this.searchKeywords.pipe(
    debounceTime(400), // ignore terms typed within 400ms
    distinctUntilChanged() // only trigger when the term changes
  ).subscribe(keyword => {
    // perform search with the entered keyword
  });
}

Answer 3

Answer №2

Make sure to only use the pipe operator with an Observable, not a string. To do this, you will need to create a Subject in your component. The Subject in RxJS serves as both an Observer and an Observable, meaning it can emit values and listen for changes to those values.

private searchSub$ = new Subject<string>();

applyFilter(filterValue: string) {
    this.searchSub$.next(filterValue)
}

ngOnInit() {
   this.searchSub$.pipe(
     debounceTime(400),
     distinctUntilChanged()
   ).subscribe((filterValue: string) => {
     this.tableDataSource.filter = filterValue.trim().toLowerCase();
   });
}

By calling the applyFilter() method on each key press, the Subject emits the filterValue. In the ngOnInit() function, be sure to subscribe to your Subject so that you can utilize the pipe operator and debounceTime.

Answer 4

Make sure to only use the pipe operator with an Observable, not a string. To do this, you will need to create a Subject in your component. The Subject in RxJS serves as both an Observer and an Observable, meaning it can emit values and listen for changes to those values.

private searchSub$ = new Subject<string>();

applyFilter(filterValue: string) {
    this.searchSub$.next(filterValue)
}

ngOnInit() {
   this.searchSub$.pipe(
     debounceTime(400),
     distinctUntilChanged()
   ).subscribe((filterValue: string) => {
     this.tableDataSource.filter = filterValue.trim().toLowerCase();
   });
}

By calling the applyFilter() method on each key press, the Subject emits the filterValue. In the ngOnInit() function, be sure to subscribe to your Subject so that you can utilize the pipe operator and debounceTime.

Answer 5

Answer №3

You can easily utilize the power of lodash-decorators alongside lodash library.

import { Debounce } from 'lodash-decorators';

class AnyClass {
  constructor() {
    ...
  }

  @Debounce(100)
  filterData(filterValue: string) {
    ...
  }
}

Answer 6

You can easily utilize the power of lodash-decorators alongside lodash library.

import { Debounce } from 'lodash-decorators';

class AnyClass {
  constructor() {
    ...
  }

  @Debounce(100)
  filterData(filterValue: string) {
    ...
  }
}

Ways to incorporate debounce time into an input search field in typescript

Answer №1

Answer №2

Answer №3

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