3.4.3: debounce AJAX select elements, avoid server overload - followup #1052

[lkraav]

Followup to #1052

Bug Report

One AJAX request is triggered for every keypress on Users dropdown.

My platform site currently has 15000 users, this is a real query bomb if you type a whole e-mail in there to try to narrow it down.

Expected Behavior

Select element should only trigger query after probably 0.5s has passed after last keystroke.

Steps to Reproduce the Problem

1. Open Network panel

2. Type into Users filter select element

3. Observe network request triggered for each keystroke

[kasparsd]

Is the input field using the select2 input wrapper? I wonder if they provide throttling out of the box for this and we just haven't enabled it.

[lkraav]

Yep, it's Select2. And this is what we did in Sensei Automattic/sensei#2282 super simple.

[oscarssanchez]

Hi there, I can confirm this takes down a site with 30k users. Solution proposed by @lkraav works for me.