JavaScript OOP call function from other function

Question

function MyClass(projectName) {
  this.projectName = projectName;
}

MyClass.prototype.createHttpRequestObject = function() {
  /* do something */
}

MyClass.prototype.submit = function(message, script, line) {
  httpRequest = this.createHttpRequestObject();
}

The error 'this.createHttpRequestObject is not a function' goes from line 'httpRequest = this.createHttpRequestObject();'. Why? What I do wrong?

What's the code that calls MyClass.prototype.submit?

Ionuț G. Stan
– Ionuț G. Stan

2009-08-25 09:48:35 +00:00
Commented Aug 25, 2009 at 9:48 — Ionuț G. Stan
– Ionuț G. Stan, Commented Aug 25, 2009 at 9:48

Community · Accepted Answer · 2017-05-23 10:32:53Z

2

The way JavaScript interprets 'this' is different than you expect. It does not link to the 'original' object but to the current context.

See http://www.quirksmode.org/js/this.html for an explanation.

See also: jQuery/JavaScript "this" pointer confusion

edited May 23, 2017 at 10:32

CommunityBot

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answered Aug 25, 2009 at 9:50

Simon Groenewolt

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Comments

RameshVel · Accepted Answer · 2009-08-25 10:00:43Z

1

it should work if you instantiate the MyClass properly.. take a look at the below working code..

function testCall(){
   var ss = new MyClass("sam");
   ss.submit();
}

function MyClass(projectName) {
  this.projectName = projectName;
}

MyClass.prototype.createHttpRequestObject = function() {
    return "something";
}

MyClass.prototype.submit = function(message, script, line) {
  httpRequest = this.createHttpRequestObject();
}

answered Aug 25, 2009 at 10:00

RameshVel

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