min

Minimal value.
It is used only for number and date field.

Example

...
buttons: [{
  type: 'number',
  min: 0
},{
...

Example

...
buttons: [{
  type: 'sale',
  name: 'sale',
  max: new Date(), //today
  min: new Date(2017, 1, 1)
},{
...

Default

undefined