i did what u said, i swapped the calls, the call of init() went into
recursive mode,
Than i did Person.prototype.init.call(this, firstName, lastName, age)
in my init() of Manager.prototype,
it worked fine.
But than one question, why i call init() of Person in the above way,
rather than straight call of function like this
Person.prototype.init(firstName, lastName, age);
this also worked fine an gave me the expected result.
On Nov 3, 7:59 pm, Jake Verbaten <rayn...@gmail.com> wrote:
> 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();
>
> Here you are overwriting `Employee.prototype` after writing the init
> method. You will need to swap these two segments.
>
> Even then it won't work as you expect because `this.init ===
> Employee.prototype.init` and thus infinite recursion
>
> You need a `Person.prototype.init.call(this, firstName, lastName, age)`
>
>
>
>
>
>
>
> On Thu, Nov 3, 2011 at 2:49 PM, Rahul <rahulshivsha...@gmail.com> wrote:
> > 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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