javascript - How to prevent angular material mat-menu from closing?

Javascript - How to prevent angular material mat-menu from closing?

To prevent an Angular Material mat-menu from closing when a menu item is clicked or when the user clicks outside the menu, you can use the [closeMenu]="false" attribute on the mat-menu element. This attribute ensures that the menu will not automatically close when certain actions occur. Here's how you can implement this:

Example: Preventing Angular Material mat-menu from Closing

Assuming you have an Angular component using mat-menu, here's a basic setup:

  1. HTML Template:

    <button mat-button [matMenuTriggerFor]="menu">Menu</button> <mat-menu #menu="matMenu" [closeMenu]="false"> <button mat-menu-item (click)="handleMenuItemClick($event)">Item 1</button> <button mat-menu-item (click)="handleMenuItemClick($event)">Item 2</button> <button mat-menu-item (click)="handleMenuItemClick($event)">Item 3</button> </mat-menu>

  2. Component TypeScript:

    In your component TypeScript file, define the handleMenuItemClick function to handle menu item clicks. You can prevent the menu from closing by stopping the event propagation:

    import { Component } from '@angular/core'; import { MatMenuTrigger } from '@angular/material/menu'; @Component({ selector: 'app-menu-example', templateUrl: './menu-example.component.html', styleUrls: ['./menu-example.component.css'] }) export class MenuExampleComponent { handleMenuItemClick(event: Event): void { // Handle menu item click action console.log('Menu item clicked', event); // Prevent the menu from closing event.stopPropagation(); } }

Explanation:

  • HTML Template:

    • [closeMenu]="false" on the <mat-menu> element prevents the menu from closing when clicking outside or when clicking on a menu item.

  • Component TypeScript:

    • handleMenuItemClick(event: Event) is the function called when a menu item (<button mat-menu-item>) is clicked.
    • event.stopPropagation() prevents the click event from propagating further, which stops Angular Material from closing the menu.

Notes:

  • Ensure that you import MatMenuModule and MatButtonModule in your Angular module (app.module.ts or respective feature module) where you're using mat-menu.
  • Use [closeMenu]="false" selectively, as preventing the menu from closing can affect user experience, especially on mobile or touch devices.
  • Make sure to handle the menu closing explicitly if needed, as preventing closure might affect accessibility and usability.

This approach allows you to control the behavior of Angular Material mat-menu and prevent it from closing when certain conditions are met, giving you more flexibility in how users interact with menus in your Angular application.

Examples

  1. Angular Material mat-menu prevent close on click outside

    • Description: Stop Angular Material mat-menu from closing when clicking outside of it.
    • Code Implementation: Use hasBackdrop property set to false on mat-menu.
    <mat-menu #menu="matMenu" [hasBackdrop]="false"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button>

  2. Angular Material mat-menu disable auto-close

    • Description: Disable automatic closing of Angular Material mat-menu on click outside.
    • Code Implementation: Set autoClose attribute to 'false' on mat-menu.
    <mat-menu #menu="matMenu" [autoClose]="'false'"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button>

  3. Angular Material mat-menu prevent close on scroll

    • Description: Prevent Angular Material mat-menu from closing when scrolling the page.
    • Code Implementation: Use closeOnScroll attribute set to false on mat-menu.
    <mat-menu #menu="matMenu" [closeOnScroll]="false"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button>

  4. Angular Material mat-menu prevent close on button click

    • Description: Keep Angular Material mat-menu open even when clicking an item inside it.
    • Code Implementation: Add stopPropagation() to the click event handler of menu items.
    <mat-menu #menu="matMenu"> <button mat-menu-item (click)="$event.stopPropagation()">Item 1</button> <button mat-menu-item (click)="$event.stopPropagation()">Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button>

  5. Angular Material mat-menu prevent close programmatically

    • Description: Programmatically control when Angular Material mat-menu should close.
    • Code Implementation: Use opened property and manage it with a boolean in component logic.
    <mat-menu #menu="matMenu"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button (click)="menu.open()">Open Menu</button> 
    import { MatMenuTrigger } from '@angular/material/menu'; @ViewChild('menu') menu!: MatMenuTrigger; closeMenu() { this.menu.closeMenu(); }

  6. Angular Material mat-menu prevent close on mouseleave

    • Description: Prevent Angular Material mat-menu from closing when mouse leaves it.
    • Code Implementation: Use mat-menu attributes like menuGapOverlapTrigger and manage mouse events.
    <mat-menu #menu="matMenu" menuGapOverlapTrigger="false"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button>

  7. Angular Material mat-menu prevent close on outside click

    • Description: Ensure Angular Material mat-menu does not close on clicking outside of it.
    • Code Implementation: Handle menuClosed event and prevent default behavior.
    <mat-menu #menu="matMenu" (closed)="onMenuClosed($event)"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button> 
    onMenuClosed(event: MouseEvent) { event.preventDefault(); }

  8. Angular Material mat-menu keep open on click

    • Description: Keep Angular Material mat-menu open even after clicking an item inside it.
    • Code Implementation: Use menuClosed event and set a flag to manage menu state.
    <mat-menu #menu="matMenu" (closed)="onMenuClosed($event)"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button> 
    menuClosed = false; onMenuClosed(event: MouseEvent) { this.menuClosed = true; }

  9. Angular Material mat-menu prevent close on overlay click

    • Description: Prevent Angular Material mat-menu from closing when clicking on its overlay.
    • Code Implementation: Use disableClose attribute set to true on mat-menu.
    <mat-menu #menu="matMenu" [disableClose]="true"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button>

  10. Angular Material mat-menu prevent close on mouseout

    • Description: Avoid Angular Material mat-menu from closing when mouse moves out of it.
    • Code Implementation: Manage mouseenter and mouseleave events for controlling menu state.
    <mat-menu #menu="matMenu" (mouseenter)="onMouseEnter()" (mouseleave)="onMouseLeave()"> <button mat-menu-item>Item 1</button> <button mat-menu-item>Item 2</button> </mat-menu> <button mat-button [matMenuTriggerFor]="menu">Menu</button> 
    menuOpen = false; onMouseEnter() { this.menuOpen = true; } onMouseLeave() { this.menuOpen = false; }

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