Uncaught typeerror: Object #<object> has no method 'method'

Question

So here's the object 'playerTurnObj'

function playerTurnObj(set_turn) {
    this.playerTurn=set_turn;
    function setTurn(turnToSet) {
        this.playerTurn=turnToSet;
    }
    function getTurn() {
        return this.playerTurn;
    }
}

and here is what I'm doing with it

var turn = new playerTurnObj();
turn.setTurn(1);

so I try to make the script do the setTurn() method in playerTurnObj() to save a 'turn' in a game I'm making. The problem is, it does not do the turn.setTurn(1); part because I keep getting the error above

what am I doing wrong? I searched, but I could not find an exact answer to my question.

crackmigg · Accepted Answer · 2013-05-18 12:08:13Z

1

This is not the way JavaScript works. Your "constructor" function contains inline functions that are not visible outside of the scope of playerTurnObj. So your variable turn does not have a method setTurn defined, as the error message states correctly. Probably you want something like this:

function playerTurnObj(set_turn) {
    this.playerTurn=set_turn;
}

playerTurnObj.prototype = {
    setTurn: function(turnToSet) {
        this.playerTurn=turnToSet;
    },
    getTurn: function() {
        return this.playerTurn;
    }
};

Now your variable turn has two methods setTurn and getTurn that operate on the instance you created with new.

answered May 18, 2013 at 12:08

crackmigg

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1 Comment

crackmigg Over a year ago

The other suggestions here do work too, there are many ways to achieve this. Usind prototype has the advantage of not filling up memory with each instance.

Darren · Accepted Answer · 2013-05-18 12:10:17Z

1

The setTurn and getTurn functions are private so they return undefined rather than invoking the function. You can do:

function playerTurnObj(set_turn) {
    this.playerTurn=set_turn;
    this.setTurn = setTurn;
    this.getTurn = getTurn;

    function setTurn(turnToSet) {
        this.playerTurn=turnToSet;
    }
    function getTurn() {
        return this.playerTurn;
    }
}

You then have public setTurn and getTurn methods and can invoke them as follows:

var turn = new playerTurnObj();
turn.setTurn(1);

http://jsfiddle.net/Ht688/

answered May 18, 2013 at 12:10

Darren

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Comments

Bimal · Accepted Answer · 2013-05-18 12:10:20Z

0

What I make out of it is you need to return the object this in function playerTurnObj(). So your new code will look something like:

function playerTurnObj(set_turn) {
    this.playerTurn=set_turn;
    function setTurn(turnToSet) {
        this.playerTurn=turnToSet;
    }
    function getTurn() {
        return this.playerTurn;
    }
    return this;
}

answered May 18, 2013 at 12:10

Bimal

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