CODEWITHSUNDEEP
angulartypescriptionic-frameworkionic2ionic3
Han Che
Han Che

Reputation: 8519

ionic 2 - item slider - slide to trigger function

I have ionic-item-sliding directives with 3 buttons. 2 (A and B) Appear when I slide left and 1 (button C) on the right.

I want to implement the behavior that the function under button C is triggered when I really drag the item to the far right.

The docs on ionic2 hompage give this code snippet as example

ondrag(event, item) {
  let percent = event.getSlidingPercent();
  if (percent > 0) {
    // positive
    console.log('right side');
  } else {
    // negative
    console.log('left side');
  }
  if (Math.abs(percent) > 1) {
        this.navCtrl.push(NextPage,{param:item},{ animate: true, direction: 'forward' })
  }
}

using it on

<ion-item-sliding *ngFor="let item of items "(ionDrag)="ondrag($event, item)"></ion-item-sliding>

I've getting the behaviour that when I swipe too far, it will call and push the page multiple times (i guess as many events as i'm throwing)

Any suggestions on how to implement this correctly?

Thanks!

Upvotes: 1

Views: 3674

Answers (1)

sebaferreras
sebaferreras

Reputation: 44659

You could add a flag to be sure the push() method is executed only once.

import { Component } from "@angular/core";
import { NavController } from 'ionic-angular/index';
import { Page1 } from 'page1.ts';

@Component({
     templateUrl:"home.html"
})
export class HomePage {

  private alreadyPushed: boolean;

  private items: Array<any>;

  private selectedItem: any;

  constructor(private navCtrl: NavController) {
    this.items = [
      'City of Amsterdam',
      'City of Bogota',
      'City of Buenos Aires',
      'City of Dhaka'
    ];
  }

  ionViewDidEnter() {
    // Initialize the flag
    this.alreadyPushed = false;

    if(this.selectedItem) {
      // Reset the selected item
      this.selectedItem._setOpenAmount(0);
    }

  }

  ondrag(event, item) {
    let percent = event.getSlidingPercent();
    if (percent > 1 && !this.alreadyPushed) {

      // Store the event to reset it later
      this.selectedItem = event;

      // Set the flag to true
      this.alreadyPushed = true;

      // Push the new page
      this.navCtrl.push(Page1, { param : item });
    }
  }
}

Also please notice that you should use percent > 1 instead of Math.abs(percent) > 1 so you only push the page when sliding to the right.

Upvotes: 5

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