CODEWITHSUNDEEP
javascript
zloctb
zloctb

Reputation: 11184

Call the parent's method?

Call the parent method.How to implement?

 function Ch() {
        this.year = function (n) {
            return n
        }
    }

    function Pant() {
        this.name = 'Kelli';
        this.year = function (n) {
            return 5 + n
        }
    }

//extends

 Pant.prototype = new Ch();
    Pant.prototype.constructor = Pant;
    pant = new Pant();
    alert(pant.name); //Kelli
    alert(pant.year(5)) //10

How to сall the parent method 

this.year = function (n) {
            return 5 + n
        }

in object?Thank you all for your help

Upvotes: 1

Views: 130

Answers (4)

bfavaretto
bfavaretto

Reputation: 71918

First of all, assuming Ch is for "child", and Pant for "parent", you are doing it backwards, which is extremely confusing. When you say

Pant.prototype = new Ch();

You're making Pant inherit from Ch. I'm assuming that's really what you mean, and that you want to call the method that returns n, instead of the one that returns n + 5. So you can do this:

function Ch() {
    this.year = function (n) {
        return n;
    }
}

function Pant() {
    this.name = 'Kelli';
    this.year = function (n) {
        return 5 + n;
    }
}

Pant.prototype = new Ch();
Pant.prototype.constructor = Pant;
pant = new Pant();
alert(pant.name); //Kelli
alert(pant.year(5)) //10

// Is the below what you need?
alert(Pant.prototype.year(5)); // 5

http://jsfiddle.net/JNn5K/

Upvotes: 1

Bergi
Bergi

Reputation: 664650

Adapting this answer to your code:

function Ch() {
    this.year = function(n) {
        return n;
    }
}

function Pant() {
    Ch.call(this); // make this Pant also a Ch instance
    this.name = 'Kelli';
    var oldyear = this.year;
    this.year = function (n) {
        return 5 + oldyear(n);
    };
}
// Let Pant inherit from Ch
Pant.prototype = Object.create(Ch.prototype, {constructor:{value:Pant}});

var pant = new Pant();
alert(pant.name); // Kelli
alert(pant.year(5)) // 10

Upvotes: 1

Joshua Dwire
Joshua Dwire

Reputation: 5443

Here is how Google's Closure Library implements inheritance:

goog.inherits = function(childCtor, parentCtor) {
  function tempCtor() {};
  tempCtor.prototype = parentCtor.prototype;
  childCtor.superClass_ = parentCtor.prototype;
  childCtor.prototype = new tempCtor();
  childCtor.prototype.constructor = childCtor;
};

Your code would then become something like:

function Ch() {}
Ch.prototype.year = 
function (n) {
   return n
}

function Pant() {}
goog.inherits(Pant,Ch);
Pant.prototype.name = 'Kelli';
Pant.prototype.year = function (n) {
   return 5 + Pant.superClass_.year.call(this, n);//Call the parent class
}

pant = new Pant();
alert(pant.name); //Kelli
alert(pant.year(5)) //10

You could of course rename the goog.inherits function if you wanted.

Upvotes: 1

Anoop
Anoop

Reputation: 23208

You can call overridden supper class(Parent) methods using __proto__ but it is not supported by IE

alert(pant.__proto__.year(5)) //5

Upvotes: 1

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