Angular 2 How to “watch” for tab changes

问题

I have:

<md-tab-group color="primary">
  <md-tab label="Проэкты">
    <h1>Some tab content</h1>
  </md-tab>
  <md-tab label="Обучалка">
    <h1>Some more tab content</h1>
    <p>...</p>
  </md-tab>
</md-tab-group>

I need to catch an event when a specific tab is clicked and call this function inside my component:

onLinkClick() {
  this.router.navigate(['contacts']); 
}

回答1:

You could use the (selectedTabChange) event. Check Material2#tabs.

Template:

<mat-tab-group color="primary" (selectedTabChange)="onLinkClick($event)">
  ...
</mat-tab-group>

Component:

import { MatTabChangeEvent } from '@angular/material';

// ...

onLinkClick(event: MatTabChangeEvent) {
  console.log('event => ', event);
  console.log('index => ', event.index);
  console.log('tab => ', event.tab);

  this.router.navigate(['contacts']); 
}

回答2:

You need to publish the event as an @Output from you md-tab component. Something like:

import { EventEmitter, Output, Input, Component } from '@angular/core';

@Component({
    selector: 'tab',
    template: `
        <button (click)="clicked()">{{ name }}</button>
    `,
    styles: [`
    `]
})
export class TabComponent {
    @Input() name = 'replaceme';
    @Output() tabClicked = new EventEmitter<null>();

    clicked() {
        this.tabClicked.emit();
    }
}

Then you consume that event in the md-tab-group, something like this:

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

@Component({
    selector: 'tab-group',
    template: `
        <!--<tab *ngFor="let tab of tabs" [name]="tab"></tab>-->
        <tab *ngFor="let tab of tabs" [name]="tab" (tabClicked)="tabChanged(tab)"></tab>
        <div>
        {{ selectedTab }}
        </div>
    `,
    styles: [`
    `]
})
export class TabGroupComponent {
    private tabs = ['foo', 'bar'];
    private selectedTab = this.tabs[0];

    onInit() {
        this.selectedTab = this.tabs[0];
    }

    tabChanged(tab) {
        this.selectedTab = tab;
    }
}

Heres a working plunker that demonstrates the concept

回答3:

You can use ngKeypress ( Angular Documentation here) into any HTML tag. For example:

<anyHtmlTag ng-keypress="yourFunction($event)">  

yourFunction(evt){
   if(evt.code === "Tab"){
      //Do your stuff
   }
}

来源：https://stackoverflow.com/questions/42059151/angular-2-how-to-watch-for-tab-changes

标签

angular

angular-material2