Inside the function() in angular 2, the value of 'this' is not defined

I've integrated a UIkit confirmation modal into my app. However, I'm encountering an issue when trying to click the <button> for confirmation. The this inside the function is showing up as undefined. Here's the snippet of code in question...

declare var UIkit:any;

deleteData(dataArr): void {

    UIkit.modal.confirm('Are you sure you want to delete this?', function() {
      console.log(dataArr);
      console.log(this);
      //use service here...
      UIkit.modal.alert('Confirmed!');  
    });
}

While attempting to use a service for an HTTP request within that function, I am facing difficulties with the this reference. Just to provide some context, I am working with Angular 2.x.

Answer №1

Utilize an arrow function...

declare var UIkit:any;

deleteData(dataArr): void {

  UIkit.modal.confirm('Are you certain you wish to delete this?', () => {

    console.log(this);
    // [...]
  });
}

Take a look at MDN: Arrow functions for more information on the topic.

An arrow function does not establish its own this context, therefore this retains its original meaning from the surrounding context.

Answer №2

'this' is not being passed to the function scope, consider:

declare var UIkit:any;

deleteData(dataArr): void {
var that = this;
UIkit.modal.confirm('Are you sure you want to delete this?', function(){
  console.log(dataArr);
  console.log(that);
  //implement service logic here...
  UIkit.modal.alert('Confirmed!');  
});
}

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