select2-bootstrap4-theme/docs/script.js at b9b12e4686ef16dd2cda34e1a92ca2bcc3991e5e · ttskch/select2-bootstrap4-theme · GitHub

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$(function () {
  $('select:not(.custom-select)').each(function () {
    $(this).select2({
      theme: 'bootstrap4',
      width: $(this).data('width') ? $(this).data('width') : $(this).hasClass('w-100') ? '100%' : 'style',
      closeOnSelect: !$(this).attr('multiple')
    })
  })
})

$(document).on('click', '.toggle-validation-js', function (e) {
  e.preventDefault()
  $this = $(this)

  $this.closest('.form-group').toggleClass('was-validated')

  $selectElement = $this.closest('.form-group').find('select')
  $selectElement
    .toggleClass($this.data('validationClass'))
})