Tips for resolving the issue of dropdown menus not closing when clicking outside of them

Question

Tips for resolving the issue of dropdown menus not closing when clicking outside of them

I am currently working on an angular 5 project where the homepage consists of several components. One of the components, navbarComponent, includes a dropdown list feature. I want this dropdown list to automatically close when clicked outside of it.

Here is the code snippet:

ngOnInit() {
    this.showMenu = false;
}

toggle() {
    this.showMenu = !this.showMenu;
}

<div *ngIf="isConnect" class=" userStyle dropdown-toggle " (click)="toggle()">
    <ul class="dropdown-menu subMenu" role="menu" *ngIf="showMenu">
        <li (click)="profile()" class="subMenuItem"> PROFILE</li>
        <li (click)="administration()" class="subMenuItem subMenuItem-last">ADMINISTRATION</li>
        <li class="subMenuItem subMenuItem-last"><button class="btn blue-btn" (click)="logout()" ><mat-icon mat-list-icon fontIcon="icon-logout"></mat-icon>LOGOUT</button></li>
    </ul>
</div>

javascript angular typescript

Answer 1

Answer №1

Incorporating this functionality into my project, the first step is to attach a click event listener to the window within the ngOnInit lifecycle hook.

ngOnInit() : void {
  this.windowClickSubscription = Observable
    .fromEvent(window, "click")
    .subscribe(this.handleWindowClick)
}

Whenever a click occurs on the window, the this.handleWindowClick method will be invoked. Let's proceed with implementing this method:

handleWindowClick(res: any) {
  let target: any = res.target;
  let threshold: number = 0;
  while(target && target.className != 'grouped-control' && threshold <= 4) {
    target = target.parentElement;
    threshold++;
  }
  if(target && target.className != 'grouped-control') this.hasOptions = false;
}

This function is designed to search for the parent element of the click target until it reaches the specified element ('grouped-control'). If found, no action is taken; otherwise, the control is closed by toggling the hasOptions flag.

To properly clean up, remember to unbind the event in the ngOnDestroy hook:

ngOnDestroy(): void {
  this.windowClickSubscription && this.windowClickSubscription.unsubscribe();
}

Lastly, don't forget to declare the this.windowClickSubscription property and bind the component reference to the handleWindowClick function in your constructor.

Edit

Add the following line to your constructor to bind the function reference:

constructor() {
  this.handleWindowClick = this.handleWindowClick.bind(this);
}

This step ensures that the function can be used as a callback handler with the correct component reference. Additionally, I am utilizing the *ngIf directive to toggle the visibility of the control based on the value of this.hasOptions.

Answer 2

Incorporating this functionality into my project, the first step is to attach a click event listener to the window within the ngOnInit lifecycle hook.

ngOnInit() : void {
  this.windowClickSubscription = Observable
    .fromEvent(window, "click")
    .subscribe(this.handleWindowClick)
}

Whenever a click occurs on the window, the this.handleWindowClick method will be invoked. Let's proceed with implementing this method:

handleWindowClick(res: any) {
  let target: any = res.target;
  let threshold: number = 0;
  while(target && target.className != 'grouped-control' && threshold <= 4) {
    target = target.parentElement;
    threshold++;
  }
  if(target && target.className != 'grouped-control') this.hasOptions = false;
}

This function is designed to search for the parent element of the click target until it reaches the specified element ('grouped-control'). If found, no action is taken; otherwise, the control is closed by toggling the hasOptions flag.

To properly clean up, remember to unbind the event in the ngOnDestroy hook:

ngOnDestroy(): void {
  this.windowClickSubscription && this.windowClickSubscription.unsubscribe();
}

Lastly, don't forget to declare the this.windowClickSubscription property and bind the component reference to the handleWindowClick function in your constructor.

Edit

Add the following line to your constructor to bind the function reference:

constructor() {
  this.handleWindowClick = this.handleWindowClick.bind(this);
}

This step ensures that the function can be used as a callback handler with the correct component reference. Additionally, I am utilizing the *ngIf directive to toggle the visibility of the control based on the value of this.hasOptions.

Answer 3

Answer №2

When the Dropdown is opened, a class 'open' is added to the element with the class 'dropdown-toggle'. The class is removed when the dropdown is closed. Additionally, clicking outside of the dropdown area will also close it.

Below is the code I used to achieve this functionality:

<div class="drop-menu">
    <a class="dropdown-toggle" title="Filter" (click)="openDropdown()">
       <span class="fa fa-arrow"></span>
    </a>
    <ul class="dropdown-menu subMenu" role="menu" *ngIf="showMenu">
       <li (click)="profile()" class="subMenuItem"> PROFILE</li>
       <li (click)="administration()" class="subMenuItem subMenuItem-last">ADMINISTRATION</li>
       <li class="subMenuItem subMenuItem-last"><button class="btn blue-btn" (click)="logout()" ><mat-icon mat-list-icon fontIcon="icon-logout"></mat-icon>LOGOUT</button></li>
    </ul>
</div>

Snippet from component.ts file:

constructor(private renderer: Renderer2) { }
ngOnInit() {
  const selectDOM = document.getElementsByClassName('dropdown-toggle')[0];
  this.renderer.listen('document', 'click', (evt) => {
    const eventPath = evt.path;
    const hasClass = _.where(eventPath, { className: 'drop-menu' });
    if (hasClass.length <= 0) {
      this.renderer.removeClass(selectDOM, 'open');
    }
  });
}

openDropdown() {
  const selectDOM = document.getElementsByClassName('dropdown-toggle')[0];
  if (selectDOM.classList.contains('open')) {
    this.renderer.removeClass(selectDOM, 'open');
  } else {
    this.renderer.addClass(selectDOM, 'open');
  }
}

Answer 4

When the Dropdown is opened, a class 'open' is added to the element with the class 'dropdown-toggle'. The class is removed when the dropdown is closed. Additionally, clicking outside of the dropdown area will also close it.

Below is the code I used to achieve this functionality:

<div class="drop-menu">
    <a class="dropdown-toggle" title="Filter" (click)="openDropdown()">
       <span class="fa fa-arrow"></span>
    </a>
    <ul class="dropdown-menu subMenu" role="menu" *ngIf="showMenu">
       <li (click)="profile()" class="subMenuItem"> PROFILE</li>
       <li (click)="administration()" class="subMenuItem subMenuItem-last">ADMINISTRATION</li>
       <li class="subMenuItem subMenuItem-last"><button class="btn blue-btn" (click)="logout()" ><mat-icon mat-list-icon fontIcon="icon-logout"></mat-icon>LOGOUT</button></li>
    </ul>
</div>

Snippet from component.ts file:

constructor(private renderer: Renderer2) { }
ngOnInit() {
  const selectDOM = document.getElementsByClassName('dropdown-toggle')[0];
  this.renderer.listen('document', 'click', (evt) => {
    const eventPath = evt.path;
    const hasClass = _.where(eventPath, { className: 'drop-menu' });
    if (hasClass.length <= 0) {
      this.renderer.removeClass(selectDOM, 'open');
    }
  });
}

openDropdown() {
  const selectDOM = document.getElementsByClassName('dropdown-toggle')[0];
  if (selectDOM.classList.contains('open')) {
    this.renderer.removeClass(selectDOM, 'open');
  } else {
    this.renderer.addClass(selectDOM, 'open');
  }
}

Answer 5

Answer №3

Include a TemplateRef-Id in your navigation menu:

<ul #menuRef class="dropdown-menu subMenu" role="menu" *ngIf="showMenu">

                ....
</ul>

Retrieve the TemplateRef within your code:

@ViewChild('menuRef') menuRef: TemplateRef<any>;

Next, set up a global click event listener at the document level:

@HostListener('document:click', ['$event'])
hideMenu(event) {
  if (!this.menuRef.nativeElement.Contains(event.target) {
    if (this.showMenu) {
       this.showMenu = false;
    }
  }
}

If the click occurs outside of the dropdown area, hide the menu by setting showMenu=false.

Consider utilizing a component for your dropdown instead. Check out ng-select, which handles these functionalities automatically.

Answer 6

Include a TemplateRef-Id in your navigation menu:

<ul #menuRef class="dropdown-menu subMenu" role="menu" *ngIf="showMenu">

                ....
</ul>

Retrieve the TemplateRef within your code:

@ViewChild('menuRef') menuRef: TemplateRef<any>;

Next, set up a global click event listener at the document level:

@HostListener('document:click', ['$event'])
hideMenu(event) {
  if (!this.menuRef.nativeElement.Contains(event.target) {
    if (this.showMenu) {
       this.showMenu = false;
    }
  }
}

If the click occurs outside of the dropdown area, hide the menu by setting showMenu=false.

Consider utilizing a component for your dropdown instead. Check out ng-select, which handles these functionalities automatically.

Tips for resolving the issue of dropdown menus not closing when clicking outside of them

Answer №1

Answer №2

Answer №3

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