Getting global Javascript variable in another Javascript file

Question

Lets say I have a variable:

<script type="text/javascript">
    var myVariable = "something";
</script>

After this js global variable declaration I have another javascript:

<script type="text/javascript" src="myScriptFile.js"></script>

In this file I need to use the value of my global myVariable variable. I know that I can do it by setting this value in some HTML, then using DOM or jQuery or something else get this value in the file, but I want to avoid creating those kind of hidden fields in my HTML. Is there any better way to do this?

You can set the variable on the `window` object instead from any external file: `window.myVariable = "something";`, then you just need to make sure it gets set before you use it in `myScriptFile.js` — CodingIntrigue, Aug 28 '13 at 08:22
@RGraham It's already added to the window object. No need to set it explicitly. — Johan, Aug 28 '13 at 08:23

score 5 · Accepted Answer · answered Aug 28 '13 at 08:25

5

Make it global;

script1.js

 var foobar = "O HAI";

script2.js

  alert(foobar);

answered Aug 28 '13 at 08:25

Tushar Gupta - curioustushar

58,085
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score 2 · Answer 2 · answered Aug 28 '13 at 08:30

2

Anything that you will put in window in any place (even in functions) will be visible in global scope. So

<script type="text/javascript">
    window.myVariable = "something";
</script>

And myVariable will be visible anywhere

answered Aug 28 '13 at 08:30

redexp

4,765
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score 1 · Answer 3 · answered Aug 28 '13 at 08:30

1

I use global variables with

jQuery.data(document.body, "varAgrup", { var1: value1, var2: value2 });

I get var value with

jQuery.data(document.body, "varAgrup").var1;

answered Aug 28 '13 at 08:30

Víctor Dueñas Robles

393
1
9

the best solution I would say :) – Amir Oct 26 '15 at 22:46

score 0 · Answer 4 · answered Aug 28 '13 at 08:24

0

You can use the global variable in the myScriptFile.js file if it was defined before the script which will use it on the same page.

answered Aug 28 '13 at 08:24

Alexandr Mihalciuc

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Getting global Javascript variable in another Javascript file

4 Answers4