accessing JS object's member or method, from within the same object

Question

i have the following script, in which i am trying to create a config object for an application :

  var myConfig = {
  localDBAllowed: function () {
      return window.openDatabase;
  },
  MessageBox: function (message, title) {
      if (navigator.notification) {
          navigator.notification.alert(message, null, title, 'OK');
      } else {
          alert(message);
      }
  },
  initializeDb: function(){
      if (localDBAllowed) {
          messageBox('local db allowed', '');
      } else {
          messageBox('local db not allowed', '');
      }
  }
  };
  myConfig .initializeDb();

the error i get is that localDBAllowed not defined.. from the line : if (localDBAllowed) {

my question is how to access an object's member / method from within the sane object. i tried using this keyword with no success as below:

 if (this.localDBAllowed) {
            messageBox('local db allowed', '');

When I make the change you tried (changing the condition to this.localDBAllowed) the code works and the condition is executed. Are you perhaps now getting a different error? — oliakaoil
– oliakaoil, Commented Jul 30, 2014 at 15:57
Also note that Javascript is case-sensitive, so your calls to messageBox(...) should be this.MessageBox(...) — sherb
– sherb, Commented Jul 30, 2014 at 15:59

Ian Wang · Accepted Answer · 2014-07-30 15:57:57Z

1

this.localDBAllowed

will not return any values, try

this.localDBAllowed()

should do the trick

answered Jul 30, 2014 at 15:57

Ian Wang

3422 silver badges13 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Ian Wang Over a year ago

you need to execute the function, or this.localDBAllowed will always be true, because you're just testing a function.

pattmorter · Accepted Answer · 2014-07-30 15:58:09Z

0

This worked for me. (Pun intended)

var myConfig = {
  localDBAllowed: function () {
      return window.openDatabase;
  },
  messageBox: function (message, title) {
      if (navigator.notification) {
          navigator.notification.alert(message, null, title, 'OK');
      } else {
          alert(message);
      }
  },
  initializeDb: function (){
      if (this.localDBAllowed) {
          this.messageBox('local db allowed', '');
      } else {
          this.messageBox('local db not allowed', '');
      }
  }
};

myConfig .initializeDb();

All I did was add the this identifier to the areas where functions or variables were called within the object.

answered Jul 30, 2014 at 15:58

pattmorter

9899 silver badges21 bronze badges

Collectives™ on Stack Overflow

accessing JS object's member or method, from within the same object

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related