Question

I know PHP, server-side scripts, run first and output the html to the browser, then javascript is executed. However, I am trying to get a feel for how the javascript is executed and can’t quite figure it out.

Is Javascript executed top-down and is consistent with this top-down execution? I am dynamically creating javascript in PHP which is triggered by events in my webpage’s original javascript.

Will created JS execute exactly where I put it or will it fire before? after?

Thanks

Answer 1

JavaScript is executed by the clients browser and is parsed in conjunction with the HTML and CSS, whichever comes first.

Is Javascript executed top-down and is consistent with this top-down execution?

Yes

Will created JS execute exactly where I put it or will it fire before? after?

JavaScript inserted into the DOM will be parsed/executed immediately.