Check if Javascript script exists on page

Question

I have a bookmarklet that I\'ve made and it loads a script from my server onto the users current page. However I have an if check in my script that if a condition is not met the

Answer 1

You can place id attributes on your script tags and use document.getElementById('your-id') to identify whether the script is on the page before adding.

if (!document.getElementById('your-id')) {
    // append your script to the document here, ensure it has its id attribute set to 'your-id'
}