How to get a separate form_id for each of the taxonomy/term/%term exposed form?

Question

I'm trying to combine in a smart way Contextual filters Has taxonomy term ID with Remember the last selection feature of exposed form filters in a view.

Context

• A taxonomy vocabulary called destinations (countries & regions)
• A view of content tagged with destinations terms : Contextual filters : Content: Has taxonomy term ID (with depth)
• Exposed filters such as travel duration, price...
• Important point, Remember the last selection is ticked for all the filters
• Ajax enabled, and the whole thing displayed as a content pane

The issue

Let's say I visit taxonomy/term/spain and filter the view by price < 700$, then go to taxonomy/term/india e.g, the view will be already filtered by price < 700$, and may return empty result, which is an unwanted behaviour.

This is because across all the taxonomy/term/% paths, the exposed form form_id remains the same views_exposed_form.

How could I get a separate form_id for each of the taxonomy/term/% exposed form, so that the last selection would be kept for each term ?

Or setup my view in order to get the expected features ?

Answer 1

Without patching the module you can't...but the View object is always available in the form state, so you can use that to check where you are. e.g.

function MYMODULE_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'views_exposed_form') {
    $view = $form_state['view'];
    if ($view->name == 'foo' && $view->current_display == 'bar') {
      // ...
    }
  }
}