How to set and get the value of a global variable ?

Question

I am trying to set and get the value of a global variables. Here is the jsfiddle

HTML

<input type="button" value="setValue" onClick="setValue()">
<input type="button" value="getValue" onClick="getValue()">

JS

//setting global variable
var theValues = '';

function setValue() {
    theValues = "test";
    alert(theValues);
}

function getValue() {
    alert(theValues);
}

But it is not throwing an error and not working

What error? try window.theValue when calling global vars – Alexandru Severin Jan 18 '15 at 17:45 — Alexandru Severin, Jan 18 '15 at 17:45

score 3 · Accepted Answer · answered Jan 18 '15 at 17:49

You have to change your jsFiddle setting to allow your code to truly be in the global namespace. Right now, your code is in an onload handler and is thus not global and so the event handlers specified in your HTML are not found and thus never called.

In the upper left of your jsFiddle, change the drop-down that says "onLoad" to be "No wrap - in head". Then, your jsFiddle will work as it does here:http://jsfiddle.net/r8fsh3ek/2/.

score 0 · Answer 2 · answered Jan 18 '15 at 18:24

0

You can do like this also

<input type="button" value="setValue" onClick="setValue()">
<input type="button" value="getValue" onClick="getValue()">

Your javascript code :-

var theValue= '';
 function setValue() {
   theValues = "test";
    alert(theValues);
     return theValues;
}

function getValue() {
    theValues = setValue();
    alert(theValues);
  }

answered Jan 18 '15 at 18:24

Saurabh

101
1
8

What did you change and why? Why should returning the value make `setValue` work? And calling `setValue` inside `getValue` doesn't seem to make a lot of sense. – Felix Kling Jan 18 '15 at 18:29
I have just given another way to set the variable. – Saurabh Jan 18 '15 at 18:36
What's the other way? – Felix Kling Jan 18 '15 at 18:37
Things I have changed in the above code. – Saurabh Jan 18 '15 at 18:39
How does `return theValues;` set the variable? Either way, if you read the accepted the answer, you will see what the actual problem was. There was nothing wrong with the way the OP set the variables. – Felix Kling Jan 18 '15 at 20:13

How to set and get the value of a global variable ?

2 Answers2