What is the best way to access a variable in one file and then utilize it in multiple other files?

Question

What is the best way to access a variable in one file and then utilize it in multiple other files?

My question may seem straightforward, but I'm having trouble finding the right solution.

Within my index.html file, I have the following content:

<html>
<head>
<script src="scalar.js"></script>
</head>
<body>
</body>
<script>
function myFunction() {
  for (i = 0; i < data.length; i++) {
    data[i] *= 5
  }
alert(data)
}
</script>
</head>

In the same directory, there's a file named scalar.js with the line:

var data = [10, 20, 30, 40];

The issue I'm facing is that the array defined in scalar.js is not being utilized in index.html. I've tried including

<script src="scalar.js"></script>

within the body of the HTML file, but it doesn't work.

I would greatly appreciate any assistance! (I prefer to keep the data variable defined in scalar.js rather than setting it in the index file).

UPDATE: Take a look at the code on https://github.com/amosallaei19/NEURepo

javascript variables scope reference

Answer 1

Answer №1

Within the <script> block, you are making a reference to the data property within the window global object (since there is no data variable defined in your function).

It's important to note that the let statement does not generate properties on the window object; the declared data variable can only be accessed within the scalar.js file. Properties on the window object are only created using var.

To resolve this issue, adjust the line from:

let data = [10, 20, 30, 40];

to:

var data = [10, 20, 30, 40];

Answer 2

Within the <script> block, you are making a reference to the data property within the window global object (since there is no data variable defined in your function).

It's important to note that the let statement does not generate properties on the window object; the declared data variable can only be accessed within the scalar.js file. Properties on the window object are only created using var.

To resolve this issue, adjust the line from:

let data = [10, 20, 30, 40];

to:

var data = [10, 20, 30, 40];

Answer 3

Answer №2

After implementing your code and creating a new file which I included in my index.html, everything seems to be working fine for me. However, I did make some slight modifications to your original code.

<html>
<head>
<script src="scalar.js"></script>
</head>
<body>
</body>
<script>
//let data = [10, 20, 30, 40];
myFunction();
function myFunction() {
  for (i = 0; i < data.length; i++) {
    data[i] *= 5;
    console.log(data);
  }
}
</script>
</html>

The output displayed is as follows:

test.html:13 (4) [50, 20, 30, 40]
test.html:13 (4) [50, 100, 30, 40]
test.html:13 (4) [50, 100, 150, 40]
test.html:13 (4) [50, 100, 150, 200]

Answer 4

After implementing your code and creating a new file which I included in my index.html, everything seems to be working fine for me. However, I did make some slight modifications to your original code.

<html>
<head>
<script src="scalar.js"></script>
</head>
<body>
</body>
<script>
//let data = [10, 20, 30, 40];
myFunction();
function myFunction() {
  for (i = 0; i < data.length; i++) {
    data[i] *= 5;
    console.log(data);
  }
}
</script>
</html>

The output displayed is as follows:

test.html:13 (4) [50, 20, 30, 40]
test.html:13 (4) [50, 100, 30, 40]
test.html:13 (4) [50, 100, 150, 40]
test.html:13 (4) [50, 100, 150, 200]

Answer 5

Answer №3

When working with scalar.js, one way to store data is by adding it to the window object. This allows you to easily access the data from within your HTML code.

window.numbers = [50, 60, 70, 80]

Answer 6

When working with scalar.js, one way to store data is by adding it to the window object. This allows you to easily access the data from within your HTML code.

window.numbers = [50, 60, 70, 80]

What is the best way to access a variable in one file and then utilize it in multiple other files?

Answer №1

Answer №2

Answer №3

Similar questions

.js script not being rendered within the ng-view

Switching the background image of a div when hovering over a particular list item

In Vue 3, what causes the dynamic class value to change along with the ref value when using a function with the ref property for binding?

update-post-thumbnail wp-ajax return false

Is it possible for two node scripts running on the same machine to interfere with each other's execution

Can 2D canvas elements make use of CSS shaders?

Explore the XML format within a JavaScript string

Leverage MongoDB output within a JavaScript script

React form input values fail to refresh upon submission

Percy snap shot test cannot be executed in Testcafe due to the error message: npm ERR! The script 'test:percy' is

Exploring the intricacies of Implementing Chromecast Networks, with a curious nod towards potentially mirroring it with

Learn how to toggle the display of a div using jQuery, just like the functionality on the popular website

Trimming text from the start and inserting ellipsis in a multi-line passage

JavaScript issue: Shallow copy does not reflect updates in nested JSON object

Next.js App encounters a missing API route (The requested page is not found)

PHP Form encountering error due to JSON decoding following an AJAX request

The styling of Material UI (MUI) buttons is not displaying correctly

adding labels to d3 elements without nesting

Avoid the need to refresh the HTML content every time there is a change in the Angular $

Determining the type of index to use for an interface