Question

I used the link to attach the js file but the aspx cant read functions from it.

Answer 1

From within your *.aspx file you should write:

<script src="/script-location/your-script.js"></script>

or

<script src="http://www.yousite.com/script-location/your-script.js"></script>

You can then use functions from within it:

<script>
    mySpecialFunction();
</script>

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