beforeValidate

fires before the control value is validated

beforeValidate: (value: object) => boolean | void;

Parameters:

• value: object - the value to be validated

Returns:

Return false to cancel the default action of the event; otherwise, true.

Example

form.getItem("avatar").events.on("beforeValidate", value => {
    console.log("beforeValidate", value);
    return value.src; // if there is a path to the image, validation will be passed
});