is text input element

一、作用

二、判定是否为文本输入元素

function isTextInputElement(elem: ?HTMLElement): boolean {
  const nodeName = elem && elem.nodeName && elem.nodeName.toLowerCase();

  if (nodeName === 'input') {
    return !!supportedInputTypes[(elem as any as HTMLInputElement).type];
  }

  if (nodeName === 'textarea') {
    return true;
  }

  return false;
}

三、常量

1. 支持的输入类型

/**
 * @see http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#input-type-attr-summary
 */
const supportedInputTypes: { [key: string]: true | undefined } = {
  color: true,
  date: true,
  datetime: true,
  'datetime-local': true,
  email: true,
  month: true,
  number: true,
  password: true,
  range: true,
  search: true,
  tel: true,
  text: true,
  time: true,
  url: true,
  week: true,
};