What is the best way for me to generate a fresh object?

Question

What is the best way for me to generate a fresh object?

In one of my components, I have implemented a feature where clicking on an image toggles a boolean variable to show or hide a menu. The HTML structure for this functionality is as follows:

<img src="../../assets/image/dropdown.png" class="dropdown-image" (click)="toggleDropDownMenu()">
        <div class="dropdown-content" [hidden]="dropDownMenu">
            <a class="menu-item" (click)="showTerms()">Policy</a>
            <a class="menu-item" (click)="showProfile()">Profile</a>
            <a class="menu-item" (click)="logOut()">Log Out</a>
        </div>

The toggleDropdownMenu() function simply switches the value of the variable:

public toggleDropDownMenu(): void {
    this.dropDownMenu = !this.dropDownMenu;    
  }

This setup allows the user to control the visibility of the menu by clicking on the image. However, I wanted to enhance this functionality by also hiding the menu when the user clicks outside of it. After some research, I discovered the concept of directives and decided to implement it in the following way:

import { Directive, ElementRef, EventEmitter, HostListener } from '@angular/core';

@Directive({
  selector: '[clickOutside]'
})
export class ClickOutsideDirective {

  @HostListener('document:click', ['$event'])
  clickout(event) {
    if(this.eRef.nativeElement.contains(event.target)) {
      console.log("clicked inside");
    } else {
      console.log("clicked outside");
    }
  }

  constructor(private eRef: ElementRef) {
    console.log(" not clicked");
  }
}

This directive successfully detects whether a click event occurred inside or outside the designated element. My goal now is to utilize this directive in my HTML code like this:

<img src="../../assets/image/dropdown.png" class="dropdown-image" (click)="toggleDropDownMenu()" 
(clickOutside)="closeMenu()">
            <div class="dropdown-content" [hidden]="dropDownMenu">
                <a class="menu-item" (click)="showTerms()">Policy</a>
                <a class="menu-item" (click)="showProfile()">Profile</a>
                <a class="menu-item" (click)="logOut()">Log Out</a>
            </div>

Is there a way to achieve this integration between the clickOutside directive and the menu toggling functionality?

Can anyone provide an example or suggest a solution?

angular typescript angular-directive

Answer 1

Answer №1

The concept of 'understanding the parameters of the constructor' may not be clear to you, but if you want to capture click events and determine whether they occur within your component, you can follow these steps:

@Component({
  selector: 'ab-example-component',
  templateUrl: './example-component.html',
  styleUrls: ['./example-component.scss'],
  host: {
    '(document:click)': 'checkClickLocation($event)',
  },    
})

export class ExampleComponent{

  constructor(private elementRef: ElementRef) {
  }

  /**
   * Listens for document click event.
   * Checks if a click occurs outside of this element.
   */
  checkClickLocation(event): void {
    if (!this.elementRef.nativeElement.contains(event.target))
      // Click event is detected outside of this component's boundaries.
  } 

}

In simple terms, we are setting up a listener for document click events at the host level and linking it to a function within the component. Then, we verify if the element reference (provided in the constructor) contains the target of the click event. I hope this explanation clarifies things.

Answer 2

The concept of 'understanding the parameters of the constructor' may not be clear to you, but if you want to capture click events and determine whether they occur within your component, you can follow these steps:

@Component({
  selector: 'ab-example-component',
  templateUrl: './example-component.html',
  styleUrls: ['./example-component.scss'],
  host: {
    '(document:click)': 'checkClickLocation($event)',
  },    
})

export class ExampleComponent{

  constructor(private elementRef: ElementRef) {
  }

  /**
   * Listens for document click event.
   * Checks if a click occurs outside of this element.
   */
  checkClickLocation(event): void {
    if (!this.elementRef.nativeElement.contains(event.target))
      // Click event is detected outside of this component's boundaries.
  } 

}

In simple terms, we are setting up a listener for document click events at the host level and linking it to a function within the component. Then, we verify if the element reference (provided in the constructor) contains the target of the click event. I hope this explanation clarifies things.

Answer 3

Answer №2

Consider implementing @Output EventEmitters

//directive.ts
import { Directive, ElementRef, EventEmitter, Output, HostListener } from '@angular/core';

@Directive({
  selector: '[clickOutside]'
})
export class ClickOutsideDirective {

  @Output() clickInside:EventEmitter<any> = new EventEmitter();
  @Output() clickOutside:EventEmitter<any> = new EventEmitter();

  @HostListener('document:click', ['$event'])
  clickedOutside(event) {
    if(this.eRef.nativeElement.contains(event.target)) {
      console.log("clicked inside");
      this.clickInside.emit(null);
    } else {
      console.log("clicked outside");
      this.clickOutside.emit(null);
    }
  }

  constructor(private eRef: ElementRef) {
    console.log(" not clicked");
  }
}

Next, add the following code snippet in your component:

<img src="../../assets/image/dropdown.png" class="dropdown-image" 
(clickInside)="toggleDropDownMenu()" (clickOutside)="closeMenu()">

Answer 4

Consider implementing @Output EventEmitters

//directive.ts
import { Directive, ElementRef, EventEmitter, Output, HostListener } from '@angular/core';

@Directive({
  selector: '[clickOutside]'
})
export class ClickOutsideDirective {

  @Output() clickInside:EventEmitter<any> = new EventEmitter();
  @Output() clickOutside:EventEmitter<any> = new EventEmitter();

  @HostListener('document:click', ['$event'])
  clickedOutside(event) {
    if(this.eRef.nativeElement.contains(event.target)) {
      console.log("clicked inside");
      this.clickInside.emit(null);
    } else {
      console.log("clicked outside");
      this.clickOutside.emit(null);
    }
  }

  constructor(private eRef: ElementRef) {
    console.log(" not clicked");
  }
}

Next, add the following code snippet in your component:

<img src="../../assets/image/dropdown.png" class="dropdown-image" 
(clickInside)="toggleDropDownMenu()" (clickOutside)="closeMenu()">

What is the best way for me to generate a fresh object?

Answer №1

Answer №2

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