Oops! There was an unexpected error: TypeError - It seems that the property 'title' cannot be read because it is undefined

HTML document example

<ion-header>
  <ion-toolbar color="danger">
    <ion-buttons>
      <button ion-button navPop icon-only>
        <ion-icon ios="ios-arrow-back" md="md-arrow-back"></ion-icon>
      </button>
    </ion-buttons>
      <ion-title text-wrap>Volunteer Selection</ion-title>
  </ion-toolbar>
</ion-header>

<ion-content>
    <h1>{{volunteer.title}}</h1><br/>
</ion-content>

TypeScript file example

import { Component } from '@angular/core';
import { NavController, NavParams } from 'ionic-angular';


@Component({
  selector: 'page-volunteer-vote-detail',
  templateUrl: 'volunteer-vote-detail.html',
})

export class VolunteerVoteDetailPage {
  volunteer:any;

  constructor(public navCtrl: NavController, public navParams: NavParams) {
    this.volunteer = navParams.get('volunteer');
  }

}

In previous pages, I have used 

this.volunteer = navParams.get('volunteer');
to retrieve data, but in this page, I am encountering an error

Error:

ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'title' of undefined TypeError: Cannot read property 'title' of undefined at Object.eval [as updateRenderer] (VM3975 VolunteerVoteDetailPage.ngfactory.js:64) at Object.debugUpdateRenderer [as updateRenderer] (VM3846 vendor.js:14729) at checkAndUpdateView (VM3846 vendor.js:13865) at callViewAction (VM3846 vendor.js:14210) at execComponentViewsAction (VM3846 vendor.js:14142) at checkAndUpdateView (VM3846 vendor.js:13866) at callWithDebugContext (VM3846 vendor.js:15092) at Object.debugCheckAndUpdateView [as checkAndUpdateView] (VM3846 vendor.js:14629) at ViewRef_.detectChanges (VM3846 vendor.js:11652) at Tab.NavControllerBase.viewAttachToDOM (VM3846 vendor.js:49817) at Object.eval [as updateRenderer] (VM3975 VolunteerVoteDetailPage.ngfactory.js:64) at Object.debugUpdateRenderer [as updateRenderer] (VM3846 vendor.js:14729) at checkAndUpdateView (VM3846 vendor.js:13865) at callViewAction (VM3846 vendor.js:14210) at execComponentViewsAction (VM3846 vendor.js:14142) at checkAndUpdateView (VM3846 vendor.js:13866) at callWithDebugContext (VM3846 vendor.js:15092) at Object.debugCheckAndUpdateView [as checkAndUpdateView] (VM3846 vendor.js:14629) at ViewRef.detectChanges (VM3846 vendor.js:11652) at Tab.NavControllerBase._viewAttachToDOM (VM3846 vendor.js:49817) at c (VM3844 polyfills.js:3) at Object.reject (VM3844 polyfills.js:3) at Tab.NavControllerBase._fireError (VM3846 vendor.js:49580) at Tab.NavControllerBase._failed (VM3846 vendor.js:49573) at VM3846 vendor.js:49620 at t.invoke (VM3844 polyfills.js:3) at Object.onInvoke (VM3846 vendor.js:4979) at t.invoke (VM3844 polyfills.js:3) at r.run (VM3844 polyfills.js:3) at VM3844 polyfills.js:3

Edit:

https://i.sstatic.net/BbwrQ.png

UPDATE:

TypeScript file update

goToVolunteerVoteDetail(volunteerItem:any) {
    this.navCtrl.push(VolunteerVoteDetailPage,{
      volunteer:volunteerItem
    });
  }

HTML document update

(click)="goToVolunteerVoteDetail(volunteer)"
javascriptangulartypescriptionic-frameworkionic3

Answer №1

The volunteer variable is currently undefined due to an error in this line of code:

this.volunteer = navParams.get('volunteer');

It appears that you are not passing a parameter named volunteer. This is why navParams remains empty. I recommend revisiting the page from which you are navigating and utilizing navcontroller in the following manner:

this.navCtrl.push(VolunteerVoteDetailPage, {
      volunteer: "yourDATA"
    });

Answer №2

According to feedback:

Have you checked the output of console.log(this.volunteer)..?

I am able to access my data

Given that the data is successfully accessed when using console.log, it appears to be an issue with the data not being available when Angular attempts to render the view. To prevent this error, you can utilize the elvis operator, like so:

<h1>{{volunteer?.title}}</h1><br/>

By doing this, Angular will refrain from trying to access the title property if volunteer is undefined.

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