Angular 中的开放层

Question

I have a click function on an OpenLayers map

testvar: string
map = new Map()


ngOnInit(): void {

this.map.on('click', function(event) {
   console.log(this.testvar)
})

}

But this is not available within the scope of the click function.

Any ideas how to do this/

Answer 1

this is because you declare your function using the function keyword. If you declare you function as an arrow function, it will work:

this.map.on('click', event => {
   console.log(this.testvar)
})

Take a look at this article for more detail about arrow function vs function: https://www.freecodecamp.org/news/when-and-why-you-should-use-es6-arrow-functions-and-when-you-shouldnt-3d851d7f0b26/

or this one: https://dmitripavlutin.com/differences-between-arrow-and-regular-functions/