Added more flexible support for custom icons via url

[oucil]

• first, in either case "icon" class is applied
• second step, checks for valid URL (uses regex from "jQuery Validation
  Plugin")
• for valid URL an inline style is added using "background-image"
• for class name, previous behaviour is preserved (default)
• P.S. sorry about all the tab/space removals, blame the editor.

[rodneyrehm]

Thank you for your PR. I won't merge this one, though…

In Issue #129 I already stated that I'd prefer an iconHook over something like this. An implementor could then create whatever kind of element and css setup they like (including pulling stuff from icon fonts, or image sprites).

[oucil]

Thanks for considering it :)

Wouldn't this still allow an iconHook since it preserves your default behaviour? Unlike the solution offered in #129 this doesn't add any additional code, it only applies an inline style rather than a class and is completely based on the value supplied.

My reasoning was, I was looking all over your documentation for ways to supply different icons and there isn't anything obvious that didn't involve a lot of work since we have a LOT of icons and unfortunately no use of sprites yet.

I think a lot of users would be in the same position as us, looking for a simple built-in and easily implemented method rather than requiring a lot of extra coding around the edges.

In the end, up to you of course, I just think this makes it more accessible to a larger and potentially less skilled audience.

Cheers!

[rodneyrehm]

You're right, maybe we can merge the two ideas.