How to get dynamic content for CustomEditView RestfulTable

[Nhac Tat Nguyen]

Hi, I have a CustomEditView for my restful table, that is a single select field. But the content is dynamically getting use ajax. See my code:

var editFieldView = AJS.RestfulTable.CustomEditView.extend({
  render: function (self) {
    var select = $("<select name='field' class='select'></select>");

    $.getJSON(url) // Get list of options use ajax here doesn't work
    .done(function (data) {
      $.each(data, function () { // This each run after return statement
        var option = "<option value='" + this.fieldId + "'>" + this.fieldName + "</option>";
        select.append(option);
      });
    });

    select.val(self.value);
    return select;
  }
});

It might be problem with async because its return element before data received. 

So how can I do my job in this case? Thanks