How can I call a JavaScript function in a callback of another function?

Question

This is my code:

function User(){
   this.nickname='nickname';
} 
User.prototype.save=function(){
   dosomething();
};
User.prototype.add=function(){
   navigator.geolocation.getCurrentPosition(function(positon){
        this.save();
   });
};

but this.save() is wrong, I want to call save() in another callback. I find this isn't pointing to the User, how can I call save() correctly?

stackoverflow.com/questions/2148451/… try this tread to understand context of this. It was really helpful. — Anil Namde
– Anil Namde, Commented Dec 7, 2013 at 20:01

Bill Criswell · Accepted Answer · 2013-12-07 19:47:58Z

5

this inside getCurrentLocation probably isn't what you think it is. Try:

User.prototype.add=function(){
  var self = this;
   navigator.geolocation.getCurrentPosition(function(positon){
        self.save();
   });
};

answered Dec 7, 2013 at 19:47

Bill Criswell

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2 Comments

Bill Criswell Over a year ago

I shouldn't feel like this is an accomplishment @p.s.w.g. ... but I'm interpreting it as one.

Givi Over a year ago

self is keyword in javascript and refers to window object.

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