What is the best way to employ document.addEventListener in TypeScript?

I am currently learning Ionic v2 and I am using document.addEventListener, but I am encountering errors as shown below:

> [11:10:21]  ionic-app-scripts 0.0.47
[11:10:21]  build dev started ...
[11:10:21]  clean started ...
[11:10:21]  clean finished in less than 1 ms
[11:10:21]  copy started ...
[11:10:21]  transpile started ...
[11:10:31]  typescript: C:/Users/skeintech/Anguler2/sample/src/pages/sample/sample.ts, line: 25
            ';' expected.

      L25:  [11:10:31]  typescript: C:/Users/skeintech/Anguler2/sample/src/pages/sample/sample.ts, line: 25 document
.addEventListener('deviceready', onDeviceReady, false);

            Parameter declaration expected.
... (remaining error messages)

Here is my TypeScript code:

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

import { NavController } from 'ionic-angular';

import { Device } from 'ionic-native';

@Component({
  selector: 'page-sample',
  templateUrl: 'sample.html'
})
export class SamplePage {

  constructor(public navCtrl: NavController) {


  }

document.addEventListener('deviceready', onDeviceReady, false);
... (function definitions)

}

How can I properly format the document.addEventListener function in TypeScript for this scenario? Any help would be appreciated.

angularjstypescriptionic2hybrid-mobile-app

Answer №1

import { Directive, ElementRef, Input, Renderer, HostListener } from '@angular/core';
@Directive({
             selector: '[imageDirective]',
             host: { '(load)': 'handleLoad()' }
          })
export class ImageDirective {
    constructor(private _el: ElementRef, private renderer: Renderer) {
        setTimeout(()=>{
           this.renderer.setElementStyle(this._el.nativeElement, 'display', 'none');
        })
    }
    handleLoad(){
        setTimeout(()=>{
            this.renderer.setElementStyle(this._el.nativeElement, 'display', 'block');
            this._el.nativeElement.nextElementSibling.outerHTML = '';
        },10)
    }
}

You can utilize Angular2 HostListener to manage events.

Thank you for reading. I hope this information proves useful to you.

Answer №2

Using Angular and Ionic, you can simplify your code by importing components like Component, OnInit, ViewChild, Platform, Nav, and NavController.

@Component({
    template: `<ion-nav #myNav [root]="_rootPage"></ion-nav>
    `})

export class MyApp implements OnInit {
    @ViewChild('myNav') nav: NavController
    public _rootPage: any;
    
    constructor(private _platform: Platform) {
    }

    ngOnInit() {
        this._platform.ready().then(() => {
            StatusBar.styleDefault();
        });
    }
}

If you're facing any issues, consider using the ionic "platform" class to resolve them. This solution could be beneficial for you. Thank you!

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