trigger keyup event with a timeout in angular

Question

trigger keyup event with a timeout in angular

I have a text box with a keyup event assigned to it for a search function. However, I want the search function to happen after a delay instead of triggering on every key press.

Here is the HTML code:

<input type="text" [(ngModel)]="searchedKPI" (keyup)="searchConfigTree()">

And here is the TypeScript code:

list = list.filter(item => item.label.toLocaleLowerCase().includes(this.searchedKPI.toLocaleLowerCase())).slice();

Right now, when searching for the string "text," the event triggers 4 times. I only want it to trigger once for the "text" string:

https://i.sstatic.net/lRflt.jpg

Any solutions?

javascript angular typescript

Answer 1

Answer №1

Welcome to the Discover the Observable's universe. Embrace the power of Observables to achieve your desired outcomes. Simply obtain a reference to your input within the component and implement the following code snippet. By using debounceTime, you can ensure that the event is triggered only after at least 1 second has passed since the previous trigger, preventing unnecessary firing during fast typing.

Observable.fromEvent(yourInput, 'keyup').debounceTime(1000).subscribe(value => /* */)

Within the subscribe method, you have the freedom to tailor your logic according to your requirements. The value parameter represents the current value of the input field.

Answer 2

Welcome to the Discover the Observable's universe. Embrace the power of Observables to achieve your desired outcomes. Simply obtain a reference to your input within the component and implement the following code snippet. By using debounceTime, you can ensure that the event is triggered only after at least 1 second has passed since the previous trigger, preventing unnecessary firing during fast typing.

Observable.fromEvent(yourInput, 'keyup').debounceTime(1000).subscribe(value => /* */)

Within the subscribe method, you have the freedom to tailor your logic according to your requirements. The value parameter represents the current value of the input field.

Answer 3

Answer №2

Preview template.html

<input type="text" [(ngModel)]="searchedKPI" (keyup)="searchConfigTree()" #something>

component.ts (make sure to implement the AfterViewInit)

     data: any;
     @ViewChild("something") something:ElementRef; 

     ngAfterViewInit(): void {
                this.data = fromEvent(this.something.nativeElement, 'keyup');
                this.data.pipe(debounceTime(1200)).subscribe(c => 
                {
                          filteredList = filteredList.filter(item => item.label.toLocaleLowerCase().includes(this.searchedKPI.toLocaleLowerCase())).slice();
                }
                );
              }

Answer 4

Preview template.html

<input type="text" [(ngModel)]="searchedKPI" (keyup)="searchConfigTree()" #something>

component.ts (make sure to implement the AfterViewInit)

     data: any;
     @ViewChild("something") something:ElementRef; 

     ngAfterViewInit(): void {
                this.data = fromEvent(this.something.nativeElement, 'keyup');
                this.data.pipe(debounceTime(1200)).subscribe(c => 
                {
                          filteredList = filteredList.filter(item => item.label.toLocaleLowerCase().includes(this.searchedKPI.toLocaleLowerCase())).slice();
                }
                );
              }

Answer 5

Answer №3

This approach has proven effective for me

Check out Template.html

<input type="text" placeholder="Filter..." class="form-control" [(ngModel)]="filter" (input)="searchChange($event.target.value, true)">
<button class="btn btn-primary" type="button" (click)="searchChange(filter, false)"><i class="fa fa-search"></i></button>

Comonent.ts

  filter= '';
  private timer: any;

  searchChange(filter: string, to = false) {
    filter = filter.toLowerCase();

    if (to) {
      clearTimeout(this.timer);

      this.timer = setTimeout(() => {
        this.valuesFilter = this.allValues.filter(f => f.field.toLowerCase().includes(filter));
      }, 400);
    } else {
      this.valuesFilter = this.allValues.filter(f => f.field.toLowerCase().includes(filter));
    }
  }

Answer 6

This approach has proven effective for me

Check out Template.html

<input type="text" placeholder="Filter..." class="form-control" [(ngModel)]="filter" (input)="searchChange($event.target.value, true)">
<button class="btn btn-primary" type="button" (click)="searchChange(filter, false)"><i class="fa fa-search"></i></button>

Comonent.ts

  filter= '';
  private timer: any;

  searchChange(filter: string, to = false) {
    filter = filter.toLowerCase();

    if (to) {
      clearTimeout(this.timer);

      this.timer = setTimeout(() => {
        this.valuesFilter = this.allValues.filter(f => f.field.toLowerCase().includes(filter));
      }, 400);
    } else {
      this.valuesFilter = this.allValues.filter(f => f.field.toLowerCase().includes(filter));
    }
  }

Answer 7

Answer №4

Is it possible to utilize a timeout function for this?

(keyup)="keyupFunc()" --> html
keyup() {
       setTimeout((your function code), desired_delay_time);
   } --> ts

Answer 8

Is it possible to utilize a timeout function for this?

(keyup)="keyupFunc()" --> html
keyup() {
       setTimeout((your function code), desired_delay_time);
   } --> ts

trigger keyup event with a timeout in angular

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

What is the best way to ensure that an HTML5 audio element buffers an entire song?

What is the best approach for managing errors between Node.js and Angular 2?

What is the method to retrieve the image's value after dropping it onto the droppable area?

Using a curly brace in a React variable declaration

Error: karma cannot locate the templateUrl for Angular component

Transferring information from a service to a parent component, and subsequently passing it to a child component

Guide on Updating the ColModel Dynamically in JAVASCRIPT/HTML using clearGridData, setGridParam, and reloadGrid Functions

Displaying a Modal with a Click Action

customizing highcharts title within a popup window

Error encountered: Unspecified "from" address in the provided or default options

xhr.send(params) allows for sending multiple parameters in one request

What is the reason that Jest is not able to spy on the function?

Ways to retrieve a variable from a separate PHP script without relying on include()

How can dat.GUI convert values to degrees within the control panel in Three.js?

"Utilizing AJAX for real-time search to target the final

Creating a conditional statement to display an alert in ReactJS based on a specific response from the console

Secure an input field for exclusive attention. React

Generating Multilayered PDF files with JavaScript in NodeJS

The AjaxPoller object is not defined and causing a TypeError

Utilizing Vue.js for the selection of multiple elements