From https://gist.github.com/silasrm

new_gist_file.js

$("#elemento").select2({
	placeholder: "Busque aqui",
	minimumInputLength: 3,
	ajax: {
		url: "url/aqui",
		dataType: 'json',
		data: function (term, page) { // page is the one-based page number tracked by Select2
			return {
				q: term, //search term
				limit: 10, // page size
			};
		},
		results: function (data, page) {
			return {results: data};
		}
	},
	formatResult: entradaFormatResult,
	formatSelection: entradaFormatSelection,
});

function entradaFormatResult(item)
{
	var markup = '<strong>'+item.campo1+'</strong>';
	markup += ' - ' + item.campo2;
	markup += ' - ' + item.campo3;
	markup += '<br />';
	markup += 'Categoria: ' + item.campo4 + ' &raquo; ' + item.campo5;
	markup += ', Fabricante: ' + item.campo6;

	return markup;
};

function entradaFormatSelection(item)
{
	var markup = item.campo1;
	markup += ' - ' + item.campo2;
	markup += ' - ' + item.campo3;

	return markup;
};