Exploring the capabilities of Angular functions through JavaScript and jQuery

As a coding novice, I'm unsure which language this is. The component.ts file I have contains a function that I need to access outside of ngOnInit(). I tried using this.openDialog(), but it came up as undefined.

I attempted defining the function in JavaScript by creating an object of the component and calling the function:

constructor(public dialog: MatDialog, private datePipe: DatePipe) {

  }
ngOnInit(){
var testVar = new testComponent(dia, date);
//dia, date are respective constructor params
}

However, I know this isn't the proper way to do it. Moving onto the Component.ts code:

export class test implements OnInit{
openDialog(){
//this is mat angular dialog
}
ngOnInit(){

 document.addEventListener('DOMContentLoaded', function () {

// trying to call the above openDialog here. 
});
}

}

I am struggling to call the dialog inside document.addEventListener(). Unfortunately, converting document.addEventListener() is not an option at this time.

Edit 1 Providing more context with additional code:

document.addEventListener('DOMContentLoaded', function () {
      var events = []

      var calendarEl = document.getElementById('calendar');

      var calendar = new Calendar(calendarEl, {
        eventLimit: true, // for all non-TimeGrid views
        views: {
          dayGridMonth: {
            eventLimit: 5 // adjust to 6 only for timeGridWeek/timeGridDay
          }
        },
        themeSystem: 'bootstrap',
        businessHours: {
          daysOfWeek: [1, 2, 3, 4, 5],
          startTime: '00:00',
          endTime: '24:00',
        },
        header: {
          left: 'prev,next',
          center: 'title',
          right: 'dayGridMonth,listView,timeGridWeek,timeGridDay'
        },
        plugins: [dayGridPlugin, interactionPlugin, listPlugin, bootstrapPlugin, timeGrigPlugin],
        eventOverlap: false,
        displayEventTime: false,
        eventClick: function (info) {
          this.curEvnt = info;
          console.log(this.curEvnt)
          this.openDialog(info.event);   //ERROR

        }
      });
    calendar.render();
});

While openDialog is defined and can be called during onInit, implementing the above code results in the error message "this.openDialog is not a function". Any suggestions or guidance would be greatly appreciated.

Answer №1

Utilize the Lifecycle Hooks feature in Angular to enhance your components and directives. Once a component/directive is created by calling its constructor, Angular executes the lifecycle hook methods in a specific order at key moments:

ngOnChanges()
ngOnInit()
ngDoCheck()
ngAfterContentInit()
ngAfterContentChecked()
ngAfterViewInit()
ngAfterViewChecked()
ngOnDestroy()

For more information, refer to the official Angular documentation on : Lifecycle Hooks

class MyComponent implements AfterContentInit {
    openDialog(){
        // Implement your custom logic for dialog functionality here
    }

    ngAfterContentInit() {
        this.openDialog()
    }
}

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