[Vuejs]-VUEJS using "this" for component referencing

Your foreach was not an arrow function that’s why you can’t call this inside of it. change all of your foreach to access this inside of it.

this.myArray.forEach(item => {
      // Here, you can use `this` already
 });

Use arrow function to maintain your context.

this.myArray.forEach((item, index) => {
   // Do here your stuff, without calling self, just "this"
});

Regards