If the URL contains this do that in Javascript

Question

I want to display a certain message on a certain page.

Suppose the name of the page I want to display something on is called "foo_page.html",

How can I do this using javascript?

Answer 1

The following will show an alert box if the url is something like http://example.com/foo_page.html :

if(location.pathname=="/foo_page.html") alert('hey!');

Answer 2

You can do it like this:

if(document.URL.indexOf("foo_page.html") >= 0){ 
...show your message
}