角度2想在对象内部定义一个数组，以便我可以推送一些值

Question

I want to define array inside the object I am using dot notation but it is always showing undefined

my HTML code

<mat-checkbox  *ngFor="let q1 of question.checkboxes;" (change)="checkboxSelected(q1,question,$event)"> {{q1.name}} </mat-checkbox>

my ts code

checkboxSelected(selected,obj,event){obj.box.push('somecondition') }

it is showing an error that

ERROR TypeError: Cannot read property 'push' of undefined

Answer 1

Check if property "box" exists inside your object "question".

If it exists, check whether it is initialized properly ie question.box = []