Question

192

Changing global variable value inside function

rated 0 times [ 195] [ 3] / answers: 1 / hits: 26005 / 11 Years ago, mon, october 7, 2013, 12:00:00

Here is my simple scenario. I have a variable defined inside the ready() function which assigns the first value.

I also have a function outside ready(). What I want to do is to use the changed variable inside my new function.

Here is my JavaScript code:

var myFunction = function() {

    // I wanna change Vp value here and wanna 

    // use this function with the new value        

    Vp = new value;



    myFunction2 (); 

};



$(document).ready(function () {



    var Vp = first value asign;

    $('#btnAddCustomer').click(myFunction);



    var myFunction2 = function() {

        // I will use Vp variable here with new value

    };

});

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denzelc

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2 Years ago

answered 11 Years ago tayaw · Accepted Answer

Discard the var statement. It assigned the value to a new local variable, instead of the global variable.

Here:

var Vp = first assigned value

var myFunction2;



var myFunction = function() {

    // I wanna change Vp value here and wanna use this function with the new value        



    Vp =  new value

    myFunction2(); 



    };



$(document).ready(function () {



    Vp = first value asign;



    $('#btnAddCustomer').click(myFunction);



    myFunction2 = function() {



    alert(Vp)



    };



});

Fiddle: http://jsfiddle.net/XGGvv/10/

NOW THAT WORKS.

A nice reading on JS variable scopes: http://coding.smashingmagazine.com/2009/08/01/what-you-need-to-know-about-javascript-scope/