Ajax code

[70ray]

Let ajax function return all data on not ok
so we can examine the error code if necessary.
Add a function ajaxAlert() to alert with the error message.

[70ray]

Sandbox at: https://www.pgdp.org/~rp31/c.branch/ajax_code

The only place this could have any effect so far as I can tell is the page browser where selecting an invalid project id or non-existent page will give an alert message.

[cpeel]

Returning the full error block to the client makes sense. I'm a little wary of the convention of having the client alert() the error to the user. That means we need to design error messages for the end user, not the client developer.

[cpeel]

Note: we should squash these commits on merge.

[srjfoo]

Bearing in mind that I know absolutely nothing about ajax, and that the code means nothing to me, I tested the page browser with invalid, nonexistent and archived projects, and with a nonexistent page number, comparing TEST with the branch, and didn't see any discrepancies.

[chrismiceli]

Returning the full error block to the client makes sense. I'm a little wary of the convention of having the client alert() the error to the user. That means we need to design error messages for the end user, not the client developer.

I do think the ajaxAlert method is kind of a strange way to handle errors, though it is cheap.

[70ray]

Sandbox updated with latest changes.