GitHub Issue 778: Track selection loading state on DataRegion so we can disable buttons and prevent another click

[cnathe]

Rationale

#778 No result when trying to select 100,000 rows when a filter is applied

Two things going on here:

1. for some reason on nightly, the selectAll post is responding with what looks like JSON but is being parsed as HTML so it is hitting a JS error when trying to get / use the "count" from the response
2. the user doesn't know that something is happening after they click on the "Select All / 100,000 Rows" button, as there is no loading spinner or disabled button in the case where the call takes some time

This PR addresses both. 1 by using jsonData to post to the selectAll API. 2 by disabling the selection buttons after click and using a loading spinner in the "Selected X of Y" text.

Related Pull Requests

• Issue 53997: Establish a maximum size for query selections #7107

Changes

• Track selection loading state on DataRegion so we can disable buttons and prevent another click
• DataRegion selectAll to use jsonData for Ajax request instead of params