Select2: how to set data after init?

Question

I need to set an array of data after initializing select2. So I want to make something like this:

var select = $(\'#select\').select2({});
select.data([
  {id: 1         


        

Answer 1

Here's what I did.

1. Extend select2

    Select2.prototype.setAjax = function (ajaxOptions)
                {
                    // Set the new ajax properties
                    var oAjaxOpts = this.options.get('ajax');
                    if (oAjaxOpts != undefined && oAjaxOpts != null)
                    {
                        for (var sKey in ajaxOptions)
                        {
                            oAjaxOpts[sKey] = ajaxOptions[sKey];
                        }
                    }
                    var DataAdapter = this.options.get('dataAdapter');
                    this.dataAdapter = new DataAdapter(this.$element, this.options);
                }

2. Initialize as usual (for example --- yours could be different)

jHtmlFrag.select2({
            dropdownParent: $(oData.jDiv),
            placeholder: "Select Option",
            allowClear: true,
            minimumInputLength: 2,
            ajax: {
                url: "",
                method: "POST",
                dataType: 'json',
                delay: 250,
                processResults: function (oResults, params)
                {
                    let page = params.page || 1;
                    // console.log(oResults, (params.page * 10));
                    return {
                        results: oResults.data,
                        pagination: {
                            more: (page * 10) < oResults.recordsFiltered
                        }
                    };
                }
            }
        }).val(null).trigger('change');

3. Set Ajax options dynamically when you feel like by calling the new extension func

jCombo.select2('setAjax', {
            url: sUrl,
            data: function (params)
            {
                let query = {
                    search: params.term,
                    type: params._type,
                    page: params.page || 1,
                }
                return query;
            },
        });

Answer 2

Source: https://select2.org/programmatic-control/add-select-clear-items

Add item:

var data = {
    id: 1,
    text: 'Barn owl'
};

var newOption = new Option(data.text, data.id, false, false);
$('#mySelect2').append(newOption).trigger('change');

Clear items:

$('#mySelect2').val(null).trigger('change');

Answer 3

For v4 you'll have to destroy and reconstruct select2 with updated data. Check https://github.com/select2/select2/issues/2830

Answer 4

You can rerender and trigger the select2

render select2

$('.select2').select2({
  placeholder: 'Slect value',
  allowClear: true
});

after need to change the data data

let dataChange = [
  {
    id: 0,
    text: 'enhancement'
  },
  {
    id: 1,
    text: 'bug'
  },
  {
    id: 2,
    text: 'duplicate'
  },
  {
    id: 3,
    text: 'invalid'
  },
  {
    id: 4,
    text: 'wontfix'
  }
];

rerender the select2

$('.select2').select2('destroy');
$('.select2').empty();
$('.select2').select2({
  placeholder: 'Slect value',
  allowClear: true,
  data: dataChange
});

trigger select2

$('.select2').trigger('change');

Hope this is the answer for you :3

Answer 5

In onload:

$.each(data, function(index, value) {
  $('#selectId').append(
    '<option value="' + data[index].id + '">' + data[index].value1 + '</option>'
  );
});

Answer 6

Make an <input type="hidden"> element and bind select2 to that. Using .select2 on a regular select box doesn't let you play with the data, it just mostly gives you the UI and post-selection methods.

Source: Select2 Documentation