JavaScript dynamic object scope

Question

Is it possible to use created objects in another scope?

var iZ = 0;
var pcs = {};
function Pc(_name, _os) //Constructor 
{            
   this.name = _name; // Pc Name
   this.os = _os;    //Pc Os
   this.ausgabe = function()  
   {
   //Do something
   }; iZ++;
}
//Creating a new object 
document.getElementById("pc_create").addEventListener("click", function()
{   
      pcs['pc' + iZ] = new Pc('Pc '+ iZ , os);
      pcs['pc' + iZ].ausgabe();    
});
//Using object in another scope
document.getElementById("run").addEventListener("click", function()
{
      pcs['pc' + iZ].name = "test"; // Doesnt work 
});

Is there another way to use solve this ?

seeing iZ being incremented and referenced inside of onclick makes me wonder if that is really the issue. — epascarello
– epascarello, Commented Mar 7, 2016 at 14:02

Rajaprabhu Aravindasamy · Accepted Answer · 2016-03-07 14:08:19Z

4

Use,

this.name = _name;

Instead of,

var name = _name;

If you don't assign the name to the current object, then that will become local variable to that constructor. This is applicable for os also.

Also the main error is, whenever you are creating an instance you are updating one variable by increment its count. So if you have created 2 instances, then your 2 objects will be stored like 'pc0' and 'pc1' respectively. But the count iZ will be 2. Now if you access 'pc2' at that time, it will not be fetched, since it was not created. So you could fix it by rewriting your code like below,

 pcs['pc' + (iZ-1)].name = "test";

edited Mar 7, 2016 at 14:08

answered Mar 7, 2016 at 13:58

Rajaprabhu Aravindasamy

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2 Comments

gurvinder372 Over a year ago

Also point out that }); iZ++ is wrong since there is an extra brace there.

Rajaprabhu Aravindasamy Over a year ago

@gurvinder372 That was a typo from OP. Just check his question now. Looks like he corrected it by himself.

shiroxxs · Accepted Answer · 2016-03-07 18:02:22Z

0

This works now:

document.getElementById("run").addEventListener("click", function()
{
      pcs['pc' + iZ].name = "test"; // Now work 
});

edited Mar 7, 2016 at 18:02

answered Mar 7, 2016 at 14:09

shiroxxs

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1 Comment

Rajaprabhu Aravindasamy Over a year ago

If you decrement it, then while creating new instances, the already existing instances will be replaced.

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