How to use classes in javascript

Question

Hi i am continue getting undefined error in alert when i am trying to access my class veriable from out side of class, i have made a main class and then use prototype to add some object into my class which i want to access from anywhere by creating new class please help me

    function initShell(){
    XMLLoader.prototype.loadXML('xml/scq.xml', initShell.prototype.loadData);
    alert(this.currentQue);
}

initShell.prototype.loadData = function(xmlRef){
    this.currentQue = 0;
    this.pageList = xmlRef.getElementsByTagName("mission");
}

var p1 = new initShell;

alert(p1.currentQue);

Answer 1

Try like this

Edit :

Working demo

// Define a class like this
function initShell(currentQue, pageList){

   // Add object properties like this
   this.currentQue= currentQue;
   this.pageList= pageList;
}

// Add methods like this.  All initShell objects will be able to invoke this
initShell.prototype.speak = function(){
    alert("Value of currentQue is : " + this.currentQue);
};

// Instantiate new objects with 'new'
var initShellObj = new initShell("A", "B");

// Invoke methods like this
initShellObj.speak();