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

var $option = $("<option selected></option>").val('1').text("Pick me");

$('#select_id').append($option).trigger('change');

Try this append then select. Doesn't duplicate the option upon AJAX call.

Answer 2

To dynamically set the "selected" value of a Select2 component:

$('#inputID').select2('data', {id: 100, a_key: 'Lorem Ipsum'});

Where the second parameter is an object with expected values.

UPDATE:

This does work, just wanted to note that in the new select2, "a_key" is "text" in a standard select2 object. so: {id: 100, text: 'Lorem Ipsum'}

Example:

$('#all_contacts').select2('data', {id: '123', text: 'res_data.primary_email'});

Thanks to @NoobishPro

Answer 3

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:

$('#sel')
    .empty() //empty select
    .append($("<option/>") //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() {
  $('#sel')
    .empty() //empty select
    .append($("<option/>") //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 = "<div class='select2-result-repository clearfix'>" +
    "<div class='select2-result-repository__avatar'><img src='" + repo.owner.avatar_url + "' /></div>" +
    "<div class='select2-result-repository__meta'>" +
    "<div class='select2-result-repository__title'>" + repo.full_name + "</div>";

  if (repo.description) {
    markup += "<div class='select2-result-repository__description'>" + repo.description + "</div>";
  }

  markup += "<div class='select2-result-repository__statistics'>" +
    "<div class='select2-result-repository__forks'><i class='fa fa-flash'></i> " + repo.forks_count + " Forks</div>" +
    "<div class='select2-result-repository__stargazers'><i class='fa fa-star'></i> " + repo.stargazers_count + " Stars</div>" +
    "<div class='select2-result-repository__watchers'><i class='fa fa-eye'></i> " + repo.watchers_count + " Watchers</div>" +
    "</div>" +
    "</div></div>";

  return markup;
}

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

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.2-rc.1/css/select2.min.css">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.2-rc.1/js/select2.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://select2.org/assets/a7be624d756ba99faa354e455aed250d.css">

<select id="sel" multiple="multiple" class="col-xs-5">
</select>

<button id="btn">Set Default</button>

Answer 4

Nice and easy:

document.getElementById("select2-id_city-container").innerHTML = "Your Text Here";

And you change id_city to your select's id.

Edit: After Glen's comment I realize I should explain why and how it worked for me:

I had made select2 working really nice for my form. The only thing I couldn't make work was to show the current selected value when editing. It was searching a third party API, saving new and editing old records. After a while I realized I didn't need to set the value correctly, only the label inside field, because if the user doesn't change the field, nothing happens. After searching and looking to a lot of people having trouble with it, I decided make it with pure Javascript. It worked and I posted to maybe help someone. I also suggest to set a timer for it.

Answer 5

    $("#select_location_id").val(value);
    $("#select_location_id").select2().trigger('change');

I solved my problem with this simple code. Where #select_location_id is an ID of select box and value is value of an option listed in select2 box.

Answer 6

if you are getting your values from ajax, before calling

$("#select_location_id").val(value);
$("#select_location_id").select2().trigger('change');

confirm that the ajax call has completed, using the jquery function when

$.when(ajax1(), ajax2(), ajax3(), ajax4()).done(function(a1, a2, a3, a4){
      // the code here will be executed when all four ajax requests resolve.
      // a1, a2, a3 and a4 are lists of length 3 containing the response text,
      // status, and jqXHR object for each of the four ajax calls respectively.
    }); 

as described here [Wait until all jQuery Ajax requests are done?