iPhone Web App – Stop body scrolling

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After reviewing several solutions, I began to create a custom solution:

bouncefix.js

http://jaridmargolin.github.io/bouncefix.js/

Usage:

bouncefix.add(el)

Apply fix so that the given element no longer causes a full body elastic bounce when scrolling at its extremes.

bouncefix.remove(el)

Remove all listeners/observers responsible for fixing the full body elastic bounce.

Why?

Scrollfix was a good start, however I noticed several problems:

  1. It only worked when there was scrollable content. If you had an
    empty page, the bounce effect on the body would occur.
  2. The API did not expose a method to remove the listeners. My app will
    have multiple pages, and it didn’t feel right to keep all of the
    listeners attached as the user moved around the app.

How?

It uses a similar approach to that of scrollfix. The problem occurs when you are at one of the scrolling extremes. On touchstart, we look to see if we are at the top extreme or bottom extreme, adding 1px if we are at the top, and removing 1px if we are at the bottom.

Unfortunately, this trick only works if we are able to set the scrollTop value. If the content is not yet scrollable, for example, you only have 1 list item, the whole body will again scroll. Bouncefix.js will take care of all of this behind the scenes by using event delegation and checking the scrollHeight against the offsetHeight anytime touchstart is triggered. In the case that there is no scrollable content, all scrolling on the container is blocked with e.preventDefault();

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