select2/src/js/select2/dropdown/hidePlaceholder.js

Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.

define([

], function () {
  function HidePlaceholder (decorated, $element, options, dataAdapter) {
    this.placeholder = this.normalizePlaceholder(options.get('placeholder'));

    decorated.call(this, $element, options, dataAdapter);
  }

  HidePlaceholder.prototype.append = function (decorated, data) {
    data.results = this.removePlaceholder(data.results);

    decorated.call(this, data);
  };

  HidePlaceholder.prototype.normalizePlaceholder = function (_, placeholder) {
    if (typeof placeholder === 'string') {
      placeholder = {
        id: '',
        text: placeholder
      };
    }

    return placeholder;
  };

  HidePlaceholder.prototype.removePlaceholder = function (_, data) {
    var modifiedData = data.slice(0);

    for (var d = data.length - 1; d >= 0; d--) {
      var item = data[d];

      if (this.placeholder.id === item.id) {
        modifiedData.splice(d, 1);
      }
    }

    return modifiedData;
  };

  return HidePlaceholder;
});