How to set selected value of jquery select2?

Question

This belong to codes prior to select2 version 4

I have a simple code of select2 that get data from ajax

Answer 1

Also as I tried, when use ajax in select2, the programmatic control methods for set new values in select2 does not work for me! Now I write these code for resolve the problem:

$('#sel')
    .empty() //empty select
    .append($("") //add option tag in select
        .val("20") //set value for option to post it
        .text("nabi")) //set a text for show in select
    .val("20") //select option of select2
    .trigger("change"); //apply to select2

You can test complete sample code in here link: https://jsfiddle.net/NabiKAZ/2g1qq26v/32/
In this sample code there is a ajax select2 and you can set new value with a button.

$("#btn").click(function() {
  $('#sel')
    .empty() //empty select
    .append($("") //add option tag in select
      .val("20") //set value for option to post it
      .text("nabi")) //set a text for show in select
    .val("20") //select option of select2
    .trigger("change"); //apply to select2
});

$("#sel").select2({
  ajax: {
    url: "https://api.github.com/search/repositories",
    dataType: 'json',
    delay: 250,
    data: function(params) {
      return {
        q: params.term, // search term
        page: params.page
      };
    },
    processResults: function(data, params) {
      // parse the results into the format expected by Select2
      // since we are using custom formatting functions we do not need to
      // alter the remote JSON data, except to indicate that infinite
      // scrolling can be used
      params.page = params.page || 1;

      return {
        results: data.items,
        pagination: {
          more: (params.page * 30) < data.total_count
        }
      };
    },
    cache: true
  },
  escapeMarkup: function(markup) {
    return markup;
  }, // let our custom formatter work
  minimumInputLength: 1,
  templateResult: formatRepo, // omitted for brevity, see the source of this page
  templateSelection: formatRepoSelection // omitted for brevity, see the source of this page
});

function formatRepo(repo) {
  if (repo.loading) return repo.text;

  var markup = "
" +
    "
" +
    "
" +
    "
" + repo.full_name + "
";

  if (repo.description) {
    markup += "
" + repo.description + "
";
  }

  markup += "
" +
    "
 " + repo.forks_count + " Forks
" +
    "
 " + repo.stargazers_count + " Stars
" +
    "
 " + repo.watchers_count + " Watchers
" +
    "
" +
    "
";

  return markup;
}

function formatRepoSelection(repo) {
  return repo.full_name || repo.text;
}

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