How do I access a variable in HTML document form external JavaScript file
Question
If I have a variable in the <script> tags of an HTML document; lets call it example .
How can I access example in my JavaScript file?
<!DOCTYPE html> <head> <link rel="stylesheet" type="text/css" href="css/example.css"> <link rel="icon" href="https://www.example.com/icon.png"> <title>Exsample</title> </head> <body> <script> var example = "example" </script> </body>
2 answers
solution1
4 ACCPTED 2018-04-06 17:47:12
Scripts loaded with <script> elements ( type=module aside) all share the same JS environment.
A variable created in the global scope by one will be available in all the others.
The only other proviso is that you can't access a variable before you create it.
<script> var example = 1; </script> <script> console.log(example); </script>
There is no difference between scripts where the script is loaded via src and those with the script provided inline.
solution2
1 2018-04-06 17:42:12
You should be able to access it through window.example . If example is declared in a function, you won't be able to access it. Your external script must also appear after the variable declaration (or you can use the defer option on the script):
console.log(window.example);
<script>var example = 'example';</script>
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