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JavaScript JavaScript Basics (Retired) Introducing JavaScript Where Does JavaScript Go?

Posted by Jennifer Wong
Jennifer Wong
1,622 Points

Both script alert run before the html renders the h1 tags. Is this because of Chrome?

This is my code:

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <link rel="stylesheet" href="css/main.css"> <title>JavaScript Basics</title> <script> alert("Alert2"); </script> </head> <body> <div class="container"> <h1>Where to place your JavaScript code.</h1> </div> <script src="script.js"></script> </body> </html>

I get both alerts before the page renders the H1 tags, why is this happening?

3 Answers

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

It's not just Chrome. Most modern browsers now wait until the script finishes before rendering the page. This is a change in the common behavior in the last few years.

Jennifer Wong
Jennifer Wong
1,622 Points

Makes sense, thanks!

Lawrence Wachira
Lawrence Wachira
593 Points

Firefox seems to follow the correct page sequence. Probably just how chrome handles scripts.

Jaspal Singh
Jaspal Singh
13,525 Points
Jaspal Singh
Jaspal Singh
13,525 Points

Your Writing the script in the head of the file, you need to delete or copy that and write it into your javascript file(script.js) which you have already placed before the body tag so that it can be executed after the HTML code.

Thanks

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

I see, you're talking about the other script in the head. But it makes no difference where you put it, all the scripts will run before the page is rendered to the screen.

Jaspal Singh
Jaspal Singh
13,525 Points
Jaspal Singh
Jaspal Singh
13,525 Points

hi Wong you need to write your javascript code after the html code so that browser can read your html code first and run the javascript after that, for this put your script in other file and attach it to the end tag of body.

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

I'm not sure what you mean by "attach it to the end tag of body", but the code shown above has the script tags in the proper place.