The issue of unattainable properties in Angular2 FullCalendar callbacks

I am working on an angular2 application with a Full Calendar component. I am trying to show a dialog when a full calendar event is clicked using the eventClick callback. Below is the relevant code snippet:

export class ScheduleComponent implements OnInit{

events: CalendarEvent[];
display: boolean;
tables: SelectItem[];
selectedTable: string;

ngOnInit(){
    this.display = false;
    this.scheduleService.GetAllEvents().subscribe((data: CalendarEvent[]) => 
            { 
                this.events = data;
                var calendar: JQuery = $("#calendar");
                (<any>calendar).fullCalendar({
                    eventClick: function(event) {
                        this.display = true;
                        return false;
                    }
                });
            });
}

}

This is a simplified version but includes all necessary details.

The issue I am facing is that the line this.display = true within the eventClick callback does not recognize the display property.

Does anyone have insight into why this is happening and how it can be resolved?

Thank you,

Answer №1

Once I posted a question, I managed to find a solution on my own.

If anyone else is struggling with this issue, the key is to utilize the 'fat arrow' notation.

Instead of the previous code:

eventClick: function(event) {
                        this.display = true;
                        return false;
                    }

I made use of:

eventClick: (event) => {
                        this.display = true;
                        return false;
                    },

I'm not entirely sure how this works since it was trial and error for me. If anyone can explain why it works, I would be eager to learn more about it.

Answer №2

The issue you encountered was related to scope. During runtime, the value of 'this' changes and as a result, the display becomes inaccessible.

Utilizing lexical scoping is a solution to this problem, which is demonstrated in the code above.

Another approach is to bind the method's context to 'this' so it runs within that specific context.

You can achieve this by utilizing the JavaScript bind method.

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