在Angular 4选项卡中选择选项卡时，如何调用函数？

Question

anyone knows how can I call a function when Tab 1 is selected ? md-on-select is no more working

<md-tab-group>
  <md-tab label="Tab 1">Content 1</md-tab>
  <md-tab label="Tab 2">Content 2</md-tab>
</md-tab-group>

Answer 1

template html:

 <md-tab-group (selectChange)='onSelectChange($event)'>
  <md-tab label="Tab 1">Content 1</md-tab>
  <md-tab label="Tab 2">Content 2</md-tab>
</md-tab-group>

component.ts

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


@Component({
  selector: 'tabs-overview-example',
  templateUrl: 'tabs-overview-example.html',
})
export class TabsOverviewExample {
  onSelectChange(event) {
    if(event.index== 0){
      console.log('Tab1 is selected!');
    }else{
      console.log('Tab1 is not selected!')
    }
  }
}

Answer 2

You need to use the selectChange event:

<md-tab-group (selectChange)="onTabSelectChange($event)">
  <md-tab label="Tab 1">Content 1</md-tab>
  <md-tab label="Tab 2">Content 2</md-tab>
</md-tab-group>

And in your component:

onTabSelectChange(tabChange: MdTabChangeEvent) {
 // do whatever you need to do here
}

You can review the docs for Material Tabs for more details on MdTabChangeEvent

Answer 3

You can do:

<md-tab-group #tabgroup (focusChange)="changeTab(tabgroup)">
  <md-tab label="Tab 1">Content 1</md-tab>
  <md-tab label="Tab 2">Content 2</md-tab>
</md-tab-group>

in ts file :

public changeTab(tabgroup) {
    let pid = tabgroup._currentLabelWrapper.id;     
    let activeTab =$("#"+pid).text().trim();
    console.dir("Active tab: " + activeTab);
}

This way you can have any number of tabs and instantly you can get which tab have been currently selected.