data

It is used only for combo field.
Combo values.

Example

...
items: [{
  type: 'combo',
  label: 'Country',
  name: 'country',
  data: [
    {index: 0, country: 'USA'},
    {index: 1, country: 'Canada'}
  ],
  displayKey: 'country',
  valueKey: 'index',
  value: 0,
  events: [{
    change: function(field, value){
      
    }
  }]
},{
...

Example: Server data

...
items: [{
  type: 'combo',
  label: 'Country',
  name: 'country',
  data: {
    proxy: {
      url: 'countries.json'
    }
  },
  displayKey: 'country',
  valueKey: 'index',
  value: 0,
  events: [{
    change: function(field, value){
      
    }
  }]
},{
...

countries.json
{
  "data": [
    {"index": 0, "country": "Canada"},
    {"index": 1, "country": "Finland"},
    {"index": 2, "country": "France"},
    {"index": 3, "country": "Japan"},
    {"index": 4, "country": "UK"},
    {"index": 5, "country": "USA"}
  ]
}

Default

undefined