I've just started working with the Ionic framework. Until now, I've gotten along okay-ish. My problem is that an array gets nulled at runtime and I can't figure out why. I'm stumped. I think, for this question, it's better to post my code first.
export interface Days
{
name:string;
}
@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage
{
days = [] as Days[];
constructor(public navCtrl: NavController, public alertCtrl: AlertController, public navParams: NavParams)
{
}
presentDayDialog(): void
{
let alert = this.alertCtrl.create({
title: 'Add new day',
message: 'Enter a name for the new day',
inputs: [
{
name: 'day',
placeholder: 'Day'
},
],
buttons: [
{
text: 'Cancel',
handler: () => {
console.log('Cancel clicked');
}
},
{
text: 'Save',
handler: data => {
this.addDays(data.day);
}
}
]
});
alert.present();
}
addDays(rname): void
{
this.days.push({name: rname});
}
itemTapped(Days)
{
this.navCtrl.push(RoutinePage, {
pageName: Days.name
});
console.log("The page name was "+Days.name);
}
}
export interface Routine
{
name:string;
weight: number;
reps: number;
}
@Component({
selector: 'page-routine',
templateUrl: 'routine.html'
})
export class RoutinePage
{
routines = [] as Routine[];
public pageName;
constructor(public navCtrl: NavController, public toastCtrl: ToastController, public alertCtrl: AlertController, public platform: Platform, public storage: Storage, public navParams: NavParams)
{
console.log('PRE CONSTRUCTOR ' + this.routines);
this.pageName = navParams.get("pageName");
this.getRoutines();
console.log('POST CONSTRUCTOR ' + this.routines);
}
//Sets the routines to storage
setRoutines()
{
console.log('ROUTINES ARRAY before setRoutine() '+ this.routines );
this.storage.set(this.pageName, this.routines );
console.log('ROUTINES ARRAY after setRoutine() '+ this.routines );
}
//Gets the routines from storage, this gets executed at the construction of this page so it isn't empty at the start
getRoutines()
{
console.log('ROUTINES ARRAY before getRoutine() '+ this.routines );
this.routines = [{name: 'Jogger', weight: 0, reps: 0}];
this.storage.get(this.pageName).then((data) => {
this.routines = data;
});
console.log('ROUTINES ARRAY after getRoutine() '+ this.routines );
}
//Adds a new routine and saves it to storage
addRoutine(rname): void
{
console.log('ROUTINES ARRAY before addRoutine() '+ this.routines );
this.routines.push({name: rname, weight: 0, reps: 0});
console.log('ROUTINES ARRAY after addRoutine() ' + this.routines);
this.setRoutines();
}
//Presents the dialog for adding a new routine on FAB-button-press, calls addRoutine function
presentRoutineDialog(): void
{
let alert = this.alertCtrl.create({
title: 'Add new routine',
message: 'Enter a name for the new routine',
inputs: [
{
name: 'routine',
placeholder: 'Routine'
},
],
buttons: [
{
text: 'Cancel',
handler: () => {
console.log('Cancel clicked');
}
},
{
text: 'Save',
handler: data => {
console.log('ROUTINES ARRAY AFTER SAVE BUTTON PRESS:' +this.routines);
this.addRoutine(data.routine);
}
}
]
});
console.log('ARRAY BEFORE ALERT: ' + this.routines);
alert.present();
console.log('ARRAY AFTER ALERT: ' + this.routines);
}
}
So, this is how I imagine this should work. I add items (Days) to a list on the "first" page. When I click on that item, I open a second page and pass the name of the "Day", which then becomes the name of the second page. I also use this name for the key-name to store this array in the storage. So every page has it's own storage from which the page is filled with info at construction.
THE PROBLEM: The routines-Array inexplicably gets nulled at runtime, except if the name of the day of first page which I click on is empty. This propably has something to do with my hacky-feeling storage system, but I can't imagine what is the culprit, exactly. These are the console logs, which I found kinda interesting:
The page name was Upper Body home.ts:63:4
PRE CONSTRUCTOR routine.ts:28:4
ROUTINES ARRAY before getRoutine() routine.ts:46:4
ROUTINES ARRAY after getRoutine() [object Object] routine.ts:51:4
POST CONSTRUCTOR [object Object] routine.ts:32:4
ARRAY BEFORE ALERT: null routine.ts:91:4
ARRAY AFTER ALERT: null routine.ts:93:4
ROUTINES ARRAY AFTER SAVE BUTTON PRESS:null routine.ts:85:12
ROUTINES ARRAY before addRoutine() null
So, immediately after the constructor is "finished", the array is suddenly null. Why is that? What am I not seeing? I'm honestly at the end of my wits here and I was hoping someone could help.
