"Fix" relative links in Ajax responses

[mrclay]

I'm grabbing entity/river listings via Ajax views, and this works well except I have to rewrite any relative links (notably pagination links) in the response because they're relative to the Ajax request, not the user's location.href.

Strawman solution: If XHR and an HTTP Referrer is available, use referrer for base of pagination rewrites.

[Srokap]

I think I was fixing this issue by using base_url parameter and condition that you describe. I think we could just change the default behavior with this ticket, but still allow to override base url.

Everything on the PHP side (contrary to what label suggests)

[mrclay]

I see:

if (elgg_is_xhr()) {
    $options['base_url'] = $_SERVER['HTTP_REFERER'];
}

I guess the question is whether core pagination should just do this automatically (if base_url isn't already set).

I removed the "Javascript" label.

[Srokap]

I have no problem with doing such change to default behavior and I think it's dev-friendly after all.

[mrclay]

PR #6263