beforeUploadFile

fires before file upload begins

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

Parameters:

• value: object - the current value of the control

Returns:

Return false to cancel file uploading; otherwise, true.

Example

form.getItem("avatar").events.on("beforeUploadFile", (value) => {
    console.log("beforeUploadFile", value);
    return true;
});