If you want to encode a query string, use encodeURIComponent. The reason is simple: among a few other chars, it'll encode the forward slash and amersand that encodeURI will not.

encodeURIComponent

What's the use? Say you want to encode a URL and pass it in the query string, this will let you encode all the characters so you get something like this:

encodeURIComponent('http://abc.com/my page.html?name=bob&foo=bar')

to get the result

http%3A%2F%2Fabc.com%2Fmy%20page.html%3Fname%3Dbob%26foo%3Dbar

You can now safely pass that as a query string like so:

http://mysite.com/foo=http%3A%2F%2Fabc.com%2Fmy%20page.html%3Fname%3Dbob%26foo%3Dbar

Notice how both URLs have a query string parameter foo but that's OK because the encoded URL has that encoded. The entire foo parameter is

http%3A%2F%2Fabc.com%2Fmy%20page.html%3Fname%3Dbob%26foo%3Dbar

There is no conflict with the foo=bar in the second, encoded, URL.

encodeURI

Now, if you want to encode a complete URL that you have already, use encodeURI.

encodeURI('http://abc.com/my page.html?name=bob&foo=bar')

Will give you

http://abc.com/my%20page.html?name=bob&foo=bar

Notice how that keeps the URL valid and, in this instance, only encodes the space. If you were to run encodeURIComponent on that, you'd get the mess you see in my first example.

What characters are encoded?

As yabol commented in your first post, this page shows you the Differences between encodeURI, encodeURIComponent, and escape: lower ASCII characters. You notice specifically that encodeURIComponent encodes the following chars that encodeURI does not:

chr     encodeURI(chr)  encodeURIComponent(chr)

 +           +               %2B

 /           /               %2F

 @           @               %40

 #           #               %23

 $           $               %24

 &           &               %26

 ,           ,               %2C

 :           :               %3A

 ;           ;               %3B

 =           =               %3D

 ?           ?               %3F

Your question

You are correct in using encodeURIComponent because you're encoding a URL for a query string. This goes back to my first example. If your query-string URL (the one you're encoding) has a query string, you want that to be part of next, not part of your main URL.

Wrong

http://example.com/?next= + encodeURI('http://abc.com/my page.html?name=bob&foo=bar')

http://example.com/?next=http://abc.com/my%20page.html?name=bob&foo=bar

Your example.com url has two query string parameters: next and foo

Right

http://example.com/?next= + encodeURIComponent('http://abc.com/my page.html?foo=bar')

http://example.com/?next=http%3A%2F%2Fabc.com%2Fmy%20page.html%3Fname%3Dbob%26foo%3Dbar

Your example.com url contains only one query string parameter: next