如何在鼠标悬停时显示 angular material 下拉菜单？

Question

现在点击汉堡菜单我得到下拉列表而不是我需要它鼠标悬停在汉堡菜单这里是堆栈闪电战link。

Answer 1

为垫子按钮添加一个引用变量，用于在 mouseover 事件上触发 click。

<button mat-icon-button
        #matBtn
        (mouseover)="matBtn._elementRef.nativeElement.click()"
        [matMenuTriggerFor]="menu"
>

注意：我真的不喜欢像这样访问对象的 "private" 属性，我的这个解决方案更像是一种解决方法，如果找不到其他解决方案，请使用它。

Answer 2

app.component.html:

<mat-toolbar color="primary" >
  <span class="fill-remaining-space">
    <button #clickMe mat-icon-button [matMenuTriggerFor]="menu" (mouseenter)="clickOnHover()">
      <mat-icon>menu</mat-icon>
    </button>
    <mat-menu #menu="matMenu" [overlapTrigger]="false">
      <button mat-menu-item>
        <mat-icon>home</mat-icon>
        <span>Home</span>
      </button>
      <button mat-menu-item>
        <mat-icon>people_outline</mat-icon>
        <span>Connecting</span>
      </button>
      <button mat-menu-item>
        <mat-icon>videocam</mat-icon>
        <span>Let's talk</span>
      </button>
      <button mat-menu-item>
        <mat-icon>exit_to_app</mat-icon>
        <span>Logout</span>
      </button>
    </mat-menu>
  </span>
  <span class="fill-remaining-space">Application Title</span>
</mat-toolbar>

app.component.ts:

import { Component, ViewChild } from '@angular/core';


@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  @ViewChild('clickMe') clickMe: any;

  clickOnHover() {
    this.clickMe._elementRef.nativeElement.click();
  }

}

Answer 3

您可以使用 matMenuTrigger 指令

执行此操作

<button mat-icon-button [matMenuTriggerFor]="menu" 
    #menuTrigger="matMenuTrigger" (mouseenter)="menuTrigger.openMenu()">

要隐藏菜单，请为菜单添加 mouseleave 事件。

将所有菜单项捆绑在 span 或 div 标签中。然后附加 (mouseleave) 事件给它

<mat-menu #menu="matMenu" [overlapTrigger]="false">
    <span (mouseleave)="menuTrigger.closeMenu()">
      <button mat-menu-item>
        <mat-icon>home</mat-icon>
        <span>Home</span>
        ........
       <mat-icon>exit_to_app</mat-icon>
       <span>Logout</span>
     </button>
    </span>
</mat-menu>

分叉 DEMO

Answer 4

希望对您有所帮助

使用（鼠标输入）功能 Angular-hover-stackblitz

Answer 5

MatMenuTrigger

This directive is intended to be used in conjunction with an mat-menu tag. It is responsible for toggling the display of the provided menu instance.

<button #r="matMenuTrigger" mat-icon-button [matMenuTriggerFor]="menu" >
      <mat-icon (mouseover)="open(r)"  >menu</mat-icon>
</button>

示例：https://stackblitz.com/edit/example-angular-material-toolbar-menu-wrut3v

Answer 6

覆盖 mouseover 事件并创建 #menuTrigger 引用变量。这将解决您的问题。

  <button mat-icon-button [matMenuTriggerFor]="menu" #menuTrigger="matMenuTrigger" 
  (mouseover)="menuTrigger.openMenu()" >

我已经更新了你的stackblitz

Answer 7

我知道我参加派对已经很晚了，但是 none 以上内容确实对我有用。我最终写了一个指令，所以为我解决了这个问题。

HoverDropDownDirective

import { NgModule } from '@angular/core';
import { Directive, Input, ElementRef, OnInit } from '@angular/core';
import { MatMenuTrigger, _MatMenu } from '@angular/material';

@Directive({
    selector: '[hoverDropDown]'
})
export class HoverDropDownDirective implements OnInit {
    isInHoverBlock = false;

    constructor(private el: ElementRef) {}

    @Input() hoverTrigger: MatMenuTrigger;
    @Input() menu: any;

    ngOnInit() {
        this.el.nativeElement.addEventListener('mouseenter', () => {
            this.setHoverState(true);
            this.hoverTrigger.openMenu();

            const openMenu = document.querySelector(`.mat-menu-after.${this.menu._elementRef.nativeElement.className}`);
            if (!openMenu) {
                this.hoverTrigger.closeMenu();
                return;
            }
            openMenu.addEventListener('mouseenter', () => {
                this.setHoverState(true);
            });
            openMenu.addEventListener('mouseleave', () => {
                this.setHoverState(false);
            });
        });
        this.el.nativeElement.addEventListener('mouseleave', () => {
            this.setHoverState(false);
        });
    }

    private setHoverState(isInBlock: boolean) {
        this.isInHoverBlock = isInBlock;
        if (!isInBlock) {
            this.checkHover();
        }
    }

    private checkHover() {
        setTimeout(() => {
            if (!this.isInHoverBlock && this.hoverTrigger.menuOpen) {
                this.hoverTrigger.closeMenu();
            }
        }, 50);
    }
}

@NgModule({
    declarations: [
        HoverDropDownDirective
    ],
    exports: [
        HoverDropDownDirective
    ]
})
export class HoverDropDownDirectiveModule {}

app.module

import { HoverDropDownDirectiveModule } from '../../directives/hover-drop-down.directive';

imports: [
    HoverDropDownDirectiveModule
]

HTML

<div *ngFor="let category of categories">
    <button #menuTrigger="matMenuTrigger"
            mat-button
            [matMenuTriggerFor]="children"
            (click)="navigateMain(category.Category)"

            hoverDropDown
            [menu]="children"
            [hoverTrigger]="menuTrigger">
             {{category.Category.Description}}
    </button>
    <mat-menu #children="matMenu" hasBackdrop="false">
        <button mat-menu-item *ngFor="let sub of category.SubCategories" (click)="navigateSubCategory(sub)">{{sub.Description}}</button>
    </mat-menu>
</div>

2个注意事项：

主按钮中的 3 个属性（"hoverDropDown"、“[menu]”和“[hoverTrigger]”）
hasBackdrop="false" 垫菜单中的属性

hasBackdrop="false" 属性记录在 Angular Material 上。希望这对你有用...

如何在鼠标悬停时显示 angular material 下拉菜单？

How to show the angular material drop down on mouse over?

angular-material

angular

angular7