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fires after a control or its checkbox is shown

afterShow: (value: {[id: string]: boolean | string}, id?: string) => void;


  • value: object - the current value of the control. The object contains a set of key:value pairs where the key is the id of a checkbox and the value is the value/state of the checkbox
  • id?: string - optional, the ID of a checkbox of the control


form.getItem("CheckboxGroup").events.on("afterShow", function(value, id) {
console.log("afterShow", value, id);

Related sample: Form. Hide/Show control

Change log:

The id parameter was added in v8.0