JQuery Select2 - How to select all options

Question

I\'m using jQuery select2 multi select dropdown. I need to select all options in a dropdown from code. Basically there is a Select All checkbox on which this functionality h

Answer 1

$('.select2').select2({
  placeholder: 'Press CTRL+A for selecr or unselect all options'
});

$('.select2[multiple]').siblings('.select2-container').append('');

$(document).on('click', '.select-all', function (e) {
  selectAllSelect2($(this).siblings('.selection').find('.select2-search__field'));
});

$(document).on("keyup", ".select2-search__field", function (e) {
  var eventObj = window.event ? event : e;
  if (eventObj.keyCode === 65 && eventObj.ctrlKey)
     selectAllSelect2($(this));
});
        
        
function selectAllSelect2(that) {

  var selectAll = true;
  var existUnselected = false;
  var id = that.parents("span[class*='select2-container']").siblings('select[multiple]').attr('id');
  var item = $("#" + id);

  item.find("option").each(function (k, v) {
      if (!$(v).prop('selected')) {
          existUnselected = true;
          return false;
      }
  });

  selectAll = existUnselected ? selectAll : !selectAll;

  item.find("option").prop('selected', selectAll).trigger('change');
}

.select2-container {
  width: 90% !important;
}

.select2-container .select-all {
		position: absolute;
		top: 6px;
		right: 4px;
		width: 20px;
		height: 20px;
		margin: auto;
		display: block;
		background: url('data:image/svg+xml;utf8;base64,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') no-repeat center;
		background-size: contain;
		cursor: pointer;
		z-index: 999999;
	}

Option 1
Option 2
Option 3
Option 4