[Autocomplete] Add a way to require a minimum char number to before send ajax request

[nfacciolo]

[daFish]

Hey @weaverryan, what would be the best place to implement such an option?

[weaverryan]

Good question - because I'd love to see a PR for this.

It looks like TomSelect has a shouldLoad() option for this - https://tom-select.js.org/docs/

We use shouldLoad... sort of right now - just to hide the "No results" message when you are NOT using Ajax. We could allow a new option to be passed into the Stimulus controller - e.g. minCharacters - that, when set, we would use to have a proper shouldLoad function.

To do this, you'd need a few pieces - you can use noResultsFoundText as a guide:

A) Add the option to the form type -

ux/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php

Line 93 in 7a2eda6

'no_more_results_text' => 'No more results',

B) Transform that option into the data- attribute used for Stimulus values - e.g.

ux/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php

Lines 70 to 72 in 7a2eda6

	if ($options['max_results']) {
	$values['max-results'] = $options['max_results'];
	}

C) In the Stimulus controller, add the new value -

ux/src/Autocomplete/assets/src/controller.ts

Line 9 in 7a2eda6

noResultsFoundText: String,

(and the fake property below to make TypeScript happy).
D) Use that value down below inside the Stimulus controller

Cheers!