displayKey

Index of data to display in combo input and list.
It is used only for combo column type if data is array of objects.

Example: Local Data

{
  index: 'country',
  title: 'Country',
  type: 'combo',
  displayKey: 'country',
  data: [
    {country: "USA", id: 1},
    {country: "Canada", id: 2},
    {country: "England", id: 3}
  ]
}

Example: Server Data

{
  index: 'country',
  title: 'Country',
  type: 'combo',
  displayKey: 'country',
  data: {
    proxy: {
      url: 'countries.php',
      method: 'POST'
    }
  }
}
...
countries.php
{"data": [{"country": "USA", "id": 1},{"country": "Canada", id: 2},{"country": "England", id: 3}]}

Returned data from server must be valid JSON, in other case it will not be rendered

Default

Only for column combo type.

undefined