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dvalidator

v0.0.5

Published

A pure, extendable, very useful validator base Promise and Decorator

Downloads

8

Readme

Dvalidator

English edition

Dvalidator 是一个纯净、可扩展、非常有用的校验工具,它基于 Promise 和 Decorator 实现。

它有以下特性:

  • Compatibility : 同时支持最新版 Decorator 用法和老版用法
  • Asynchronous : 支持传递异步函数
  • Ordered : 根据你定义的顺序,有序校验
  • Small : 小巧,源码不超过 200 行
  • Easy : 使用简单,仅仅只有 2 个 Api

起步

npm install dvalidator --save
npm install @babel/plugin-proposal-decorators --save-dev

配置 babel.config.js

plugins: [
  [
    '@babel/plugin-proposal-decorators',
    {
      // Dvalidator 支持最新的 Decorator 提案(legacy: false)
      // 同样也支持旧版的 (legacy: true),Decorator 可以作用于字面量对象
      // 按照你的喜好设置,推荐使用最新的提案
    }
  ]
];

使用

假设我们有这样一个需求,我们将校验一个 user 对象,昵称和手机号是必选的,并且手机号需要发起一个服务端远程校验。

使用 Dvalidator,我们可以这样写:

// common.js
import dvalidator from 'dvalidator';

const requiredRule = {
  validator: val => val != null && val !== '',
  message: 'required'
};
const required = dvalidator(requiredRule);
const checkPhone = dvalidator(value => fetch(`xxx/${value}`));

// user-signup.js
class User {
  @required('nickname is required')
  nickname = '';
  @checkPhone('phone valid fail')
  @required
  phone = '';
}
const user = new User();

user
  .$validate()
  .then(/* success */)
  .catch(({ errors, fields }) => {
    /* fail */
    alert(errors[0].message);
    // errors 包含每个属性的错误信息,结构一致,嵌套对象会拍平
    // fields 以对象形式获取错误信息,一般用于展示表单中每一栏的错误信息
  });

你可以把校验规则做一下封装,写在单独的文件里,这样业务代码会非常简洁。

Api

dvalidator(rule: string | Function | Rule): Dvalidator

一个类柯里化函数,你可以调用无限次去丰富规则或者覆盖规则。

你需要传递规则进来,规则可以是一个函数(校验方法),字符串(错误信息),对象(包含以上两者的集合)。

例如:

dvalidator({
  validator: val => {
    // 你的校验部分代码
    // 可以返回 Boolean(同步校验) 或者 Promise(异步校验)
  },
  // 校验出错时会返回给你
  message: ''
});

一个校验规则想要返回不同错误信息:

// 传递不同的 message
dvalidator(checkPhone)('msg1');
dvalidator(checkPhone)('msg2');
// 也可以动态返回错误信息
dvalidator(() => {
  return Promise.reject(x ? 'msg1' : 'msg2');
});

$validate(filter?: Function): Promise<ValidateError | void>

把装饰器加入到对象上后,对象就是属于 “可校验对象”,你可以此方法进行数据校验。filter 是一个用来过滤属性的方法,我们可以用它做一些动态校验。

// 返回 Promise
user
  .$validate(fieldKey => {
    // 这里可以定义你的过滤逻辑
    // 如果是嵌套的对象,那么 fieldKey 会做拼接
    // 例如 user: { like: { game: 'lol' } },只想校验 like.game 的时候,你可以这样写
    return /^like\.game/.test(fieldKey);
  })
  .catch(({ errors, fields }) => {
    // xxx
  });

接口声明文件

从这里可以看到更详细的结构信息! index.d.ts

And More

Enjoy it!