[Vue] Props Validations

最新推荐文章于 2024-02-09 15:54:02 发布

转载最新推荐文章于 2024-02-09 15:54:02 发布 · 184 阅读

文章标签：

#javascript #ViewUI

本文介绍Vue.js中如何为组件定义属性及其验证方式，包括基本类型检查、默认值设定及自定义验证函数等高级特性。

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Components can specify requirements for its props, such as the types you’ve already seen. If a requirement isn’t met, Vue will warn you in the browser’s JavaScript console. This is especially useful when developing a component that’s intended to be used by others.

Vue.component('my-component', {
  props: {
    // Basic type check (`null` matches any type)
    propA: Number,
    // Multiple possible types
    propB: [String, Number],
    // Required string
    propC: {
      type: String,
      required: true
    },
    // Number with a default value
    propD: {
      type: Number,
      default: 100
    },
    // Object with a default value
    propE: {
      type: Object,
      // Object or array defaults must be returned from
      // a factory function
      default: function () {
        return { message: 'hello' }
      }
    },
    // Custom validator function
    propF: {
      validator: function (value) {
        // The value must match one of these strings
        return ['success', 'warning', 'danger'].indexOf(value) !== -1
      }
    }
  }
})