Ionic Framework持有点击事件

Question

是否可以在TypeScript中为"hold click"事件分配按钮？

喜欢:

<button ion-button icon-only color="royal" (click)="addNote()" (holdclick)="removeNote()">

Answer 1

您可以使用该press事件(手势文档中的更多信息):

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

@Component({
  templateUrl: 'template.html'
})
export class BasicPage {

  public press: number = 0;

  constructor() {}

  pressEvent(e) {
    this.press++
  }

}

在视图中:

  <ion-card (press)="pressEvent($event)">
    <ion-item>
      Pressed: {{press}} times
    </ion-item>
  </ion-card>

如果这还不够(可能在您的场景中需要更长的新闻事件),您可以通过创建自定义指令来创建自己的手势事件.更多信息可以在roblouie的这篇精彩文章中找到.这篇文章使用了旧版本的Ionic,但主要思想仍然是相同的(几乎所有的代码应该像它一样工作):

import {Directive, ElementRef, Input, OnInit, OnDestroy} from '@angular/core';
import {Gesture} from 'ionic-angular';

@Directive({
  selector: '[longPress]'
})
export class PressDirective implements OnInit, OnDestroy {
  el: HTMLElement;
  pressGesture: Gesture;

  constructor(el: ElementRef) {
    this.el = el.nativeElement;
  }

  ngOnInit() {
    this.pressGesture = new Gesture(this.el, {
      recognizers: [
        [Hammer.Press, {time: 6000}] // Should be pressed for 6 seconds
      ]
    });
    this.pressGesture.listen();
    this.pressGesture.on('press', e => {
      // Here you could also emit a value and subscribe to it
      // in the component that hosts the element with the directive
      console.log('pressed!!');
    });
  }

  ngOnDestroy() {
    this.pressGesture.destroy();
  }
}

然后在你的html元素中使用它:

<button longPress>...<button>