Fix issue #2: antd Select cannot work when using Cron component

src/components/CustomSelect.tsx

@@ -1,4 +1,4 @@
-import React, { useMemo, useCallback, useEffect, useRef } from 'react'
+import React, { useMemo, useCallback, useRef } from 'react'
 import Select from 'antd/lib/select'
 
 import { CustomSelectProps, Clicks } from '../types'
@@ -24,14 +24,6 @@ export default function CustomSelect(props: CustomSelectProps) {
  ...otherProps
  } = props
 
- useEffect(() => {
- Array.from(
- document.getElementsByClassName('ant-select-selection-search-input')
- ).forEach((element: Element) => {
- element.setAttribute('readonly', 'readonly')
- })
- }, [])
-
  const stringValue = useMemo(() => {
  if (value && Array.isArray(value)) {
  return value.map((value: number) => value.toString())
@@ -255,7 +247,9 @@ export default function CustomSelect(props: CustomSelectProps) {
 
  return (
  <Select
- mode='tags'
+ // Use 'multiple' instead of 'tags‘ mode
+ // cf: Issue #2
+ mode='multiple'
  allowClear={!readOnly}
  virtual={false}
  open={readOnly ? false : undefined}