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

If you are using an Input box, you must set the "multiple" property with its value as "true". For example,

<script>
    $(document).ready(function () {

        var arr = [{ id: 100, text: 'Lorem Ipsum 1' },
            { id: 200, text: 'Lorem Ipsum 2'}];

        $('#inputID').select2({
            data: arr,
            width: 200,
            multiple: true
        });
    });
</script>

Answer 2

I did like this-

$("#drpServices").select2().val("0").trigger("change");

Answer 3

I think you need the initSelection function

$("#programid").select2({
  placeholder: "Select a Program",
  allowClear: true,
  minimumInputLength: 3,
  ajax: {
    url: "ajax.php",
    dataType: 'json',
    quietMillis: 200,
    data: function (term, page) {
      return {
        term: term, //search term
        flag: 'selectprogram',
        page: page // page number
      };
    },
    results: function (data) {
      return {results: data};
    }
  },
  initSelection: function (element, callback) {
    var id = $(element).val();
    if (id !== "") {
      $.ajax("ajax.php/get_where", {
        data: {programid: id},
        dataType: "json"
      }).done(function (data) {
        $.each(data, function (i, value) {
          callback({"text": value.text, "id": value.id});
        });
        ;
      });
    }
  },
  dropdownCssClass: "bigdrop",
  escapeMarkup: function (m) { return m; }
});

Answer 4

In select2 < version4 there is the option initSelection() for remote data loading, through which it is possible to set initial value for the input as in edit mode.

$("#e6").select2({
    placeholder: "Search for a repository",
    minimumInputLength: 1,
    ajax: { 
        // instead of writing the function to execute the request we use Select2's convenient helper
        url: "https://api.github.com/search/repositories",
        dataType: 'json',
        quietMillis: 250,
        data: function (term, page) {
            return {
                q: term, // search term
            };
        },
        results: function (data, page) {
            // 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
            return { results: data.items };
        },
        cache: true
    },
    initSelection: function(element, callback) {
        // the input tag has a value attribute preloaded that points to a preselected repository's id
        // this function resolves that id attribute to an object that select2 can render
        // using its formatResult renderer - that way the repository name is shown preselected
        var id = $(element).val();
        if (id !== "") {
            $.ajax("https://api.github.com/repositories/" + id, {
                dataType: "json"
            }).done(function(data) { callback(data); });
        }
    },
    formatResult: repoFormatResult, // omitted for brevity, see the source of this page
    formatSelection: repoFormatSelection,  // omitted for brevity, see the source of this page
    dropdownCssClass: "bigdrop", // apply css that makes the dropdown taller
    escapeMarkup: function (m) { return m; } // we do not want to escape markup since we are displaying html in results
});

Source Documentation : Select2 - 3.5.3

Answer 5

you can use this code :

$("#programid").val(["number:2", "number:3"]).trigger("change");

where 2 in "number:2" and 3 in "number:3" are id field in object array

Answer 6

For multiple values something like this:

$("#HouseIds").select2("val", @Newtonsoft.Json.JsonConvert.SerializeObject(Model.HouseIds));

which will translate to something like this

$("#HouseIds").select2("val", [35293,49525]);