https://stackoverflow.com/q/62737797/863110

863110.js

const select = $("#pipe_name" + j)
  .select2({
    placeholder: '-- Choose Pipe Name --',
    theme: "bootstrap",
    width: '100%'
  })
  .html('');
  .append('<option value="">-- Choose Pipe Name --</option>');

  $.ajax({
    url: url,
    type: 'GET',
    dataType: 'json',
    success: function(result) {
      for (i = 0; i < result.length; i++) {
        select.append('<option value="' + result[i].code + '">' + result[i].code + '|' + result[i].name + '|' + result[i].unit + '</option>');
      }
    }
  })