[Feature request] add previousSuggestion to formatResult function

[abriginets]

Hello. Would you please add third parameter previousSuggestion to formatResult function? It would be very usefull to build child suggestions depending on previous suggestion value. Thanks.

[tkirda]

What do you mean by previousSuggestion?

[abriginets]

@tkirda I dare say that formatResult runs some loop to iterate over the suggestions array. If I'm right then there should be an ability to call for an element which was iterated before current.

[tkirda]

As a third parameter it passes suggestion index. So you can lookup previous suggestion in suggestions array. Suggestions are stored in suggestions array on autocomplete instance.

I don't see usefulness of it, but if you need it you can access previous suggestion by looking up by index.

[abriginets]

Excuse me for my silliness, but how could I access suggestions inside of formatResult? I could not access anythis by using $(this), this or suggestions. Much thanks in advance.

[tkirda]

It is little bit ugly but should work:

let instance;

$('#input').autocomplete({
  formatResult: (suggestion, value, i) => {
     console.log('previous', instance.suggestions[i-1]);
     return suggestion.value;
  }
});

// Assign to variable which can be accessed inside formatResult
instance = $('#input').autocomplete();