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beforeShow

fires before a control or its checkbox is shown

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

Parameters:

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

Returns:

Return false to prevent a control or its checkbox from being shown; otherwise, true.

Example

form.getItem("CheckboxGroup").events.on("beforeShow", function(value, id) {
    console.log("beforeShow", value, id);
    return true;
});

Related sample: Form. Hide/Show control

Change log:

The id parameter was added in v8.0