How to use Select2 with JSON via Ajax request?

Here you have an example

$("#profiles-thread").select2({    minimumInputLength: 2,    tags: [],    ajax: {        url: URL,        dataType: 'json',        type: "GET",        quietMillis: 50,        data: function (term) {            return {                term: term            };        },        results: function (data) {            return {                results: $.map(data, function (item) {                    return {                        text: item.completeName,                        slug: item.slug,                        id: item.id                    }                })            };        }    }});

It's quite easy

for select2 v4.0.0 slightly different

$(".itemSearch").select2({    tags: true,    multiple: true,    tokenSeparators: [',', ' '],    minimumInputLength: 2,    minimumResultsForSearch: 10,    ajax: {        url: URL,        dataType: "json",        type: "GET",        data: function (params) {            var queryParameters = {                term: params.term            }            return queryParameters;        },        processResults: function (data) {            return {                results: $.map(data, function (item) {                    return {                        text: item.tag_value,                        id: item.tag_id                    }                })            };        }    }});

In Version 4.0.2 slightly different Just in processResults and in result :

    processResults: function (data) {        return {            results: $.map(data.items, function (item) {                return {                    text: item.tag_value,                    id: item.tag_id                }            })        };    }

You must add data.items in result. items is Json name :

{  "items": [    {"id": 1,"name": "Tetris","full_name": "s9xie/hed"},    {"id": 2,"name": "Tetrisf","full_name": "s9xie/hed"}  ]}