Javascript Closures, Callbacks, This and That
- by nazbot
I am having some trouble getting a callback function to work. Here is my code:
SomeObject.prototype.refreshData = function()
{
var read_obj = new SomeAjaxCall("read_some_data", { }, this.readSuccess, this.readFail);
}
SomeObject.prototype.readSuccess = function(response)
{
this.data = response;
this.someList = [];
for (var i = 0; i < this.data.length; i++)
{
var systemData = this.data[i];
var system = new SomeSystem(systemData);
this.someList.push(system);
}
this.refreshList();
}
Basically SomeAjaxCall is making an ajax request for data. If it works we use the callback 'this.readSuccess' and if it fails 'this.readFail'.
I have figured out that 'this' in the SomeObject.readSuccess is the global this (aka the window object) because my callbacks are being called as functions and not member methods. My understanding is that I need to use closures to keep the 'this' around, however, I have not been able to get this to work.
If someone is able show me what I should be doing I would appreciate it greatly. I am still wrapping my head around how closures work and specifically how they would work in this situation.
Thanks!
