Drag/drop in fix window/area

[dawe484]

Hi, I'm developing my first web game and I have small problem.

Uncaught TypeError: this.constrainBackground is not a function .... on line 50

I dont know what I'm doing wrong. Any ideas? Thx

(This is about that the user can drag/drop background image only from left to right in the window (fix size window).

 

[ivan.popelyshev]

How to see "this" from inner function:

//old style
var self = this;
function foo() {
   self.bar();
}

//new style
var foo = () => {
   this.bar();
}

[dawe484]

thanks for advice, now it's working