keyvaldropdowneditor.js

KeyValDropdownEditor.prototype.prepare = function () {
  Handsontable.editors.BaseEditor.prototype.prepare.apply(this, arguments) // call parent method

  var source = this.cellProperties.source
  var options

  Handsontable.Dom.empty(this.select)

  if (typeof source === 'function') {
    options = source(this.row, this.col, this.prop)
  } else {
    options = source
  }

  // If options is a promise, wait for it to resolve before continuing
  options.forEach(function (option) {
    var label = option.label || option.value || option
    var value = option.value || option.label || option

    var optionEl = document.createElement('option')
    optionEl.value = value
    Handsontable.Dom.fastInnerHTML(optionEl, label)
    this.select.appendChild(optionEl)
  }, this)
}