hi friends ,
please follow the code below,
function Person(firstName,lastName,age){
alert(" Person constructor called ");
if(arguments.length > 0){
this.init(firstName,lastName,age);
}
}
Person.prototype.toString = function(){
return "-> FIRST-NAME "+this.firstName+
"\n LAST-NAME "+this.lastName;
}
Person.prototype.init = function(fName,lName,age){
alert("INIT-METHOD OF PERSON-PROTOTYPE ");
this.firstName = fName;
this.lastName = lName;
this.age = age;
}
function Employee(firstName,lastName,age,employeeId){
alert(" Employee constructor called ");
if(arguments.length > 0){
this.init(firstName,lastName,age,employeeId);
}
}
Employee.prototype.init =
function(firstName,lastName,age,employeeId){
alert("INIT-METHOD OF EMPLOYEE-PROTOTYPE ");
if(arguments.length > 0){
this.init(firstName,lastName,age);
this.empId = employeeId;
}
}
Employee.prototype = new Person();
Employee.prototype.toString = function(){
return "<*> FIRST-NAME "+this.firstName+
"\n LAST-NAME "+this.lastName+
"\n AGE "+this.age+
"\n EMP-ID "+this.empId;
}
Manager.prototype = new Employee();
function Manager(firstName,lastName,age,id,deptName){
alert(" Manager constructor called ");
if(arguments.length > 0){
this.init(firstName,lastName,age,id);
this.deptName = deptName;
}
}
Manager.prototype.toString = function(){
return "(*) FIRST-NAME "+this.firstName+
"\n(*) LAST-NAME
"+this.lastName+
"\n(*) AGE "+this.age+
"\n(*) EMP-ID "+this.empId
"\n(*) DAPARTMENT-NAME
"+this.deptName;
}
function fn37(){
var manager = new Manager("Hemesh","Kataria",
45,"INST3434","Instrumentation");
alert(manager);
}
fn37();
now what i am expecting is that my Manager should call internally
init() of Employee and than the init() method of Employee calls init()
method of Person,
But whats happening is init() of Person is getting called,
and the alert show the "id" property as "undefined",
please tell me were i am going wrong
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