使用vuelidate验证嵌套对象时,在vuetify中显示错误消息

时间:2018-07-01 14:59:34

标签: validation vuejs2 vuetify.js vuelidate

我正在使用vuelidate来验证表单输入并使用vuetifyjs显示错误消息。我设法进行了基本的对象验证,并能够显示错误消息。

但是,当我验证集合时,我在显示错误消息时遇到问题。

问题

示例数据结构:

contact: {
  websites: [
    {
      url: 'http://www.something.com',
      label: 'Website',
    }
  ]
}

验证示例:

validations: {
  websites: {
    $each: {
      url: {
        url,
      }
    }
  },
}

示例模板:

<template v-for="(website, index) in websites">
        <v-layout row :key="`website${index}`">
          <v-flex xs12 sm9 class="pr-3">
            <v-text-field
                    label="Website"
                    :value="website.url"
                    @input="$v.websites.$touch()"
                    @blur="$v.websites.$touch()"
                    :error-messages="websiteErrors"
            ></v-text-field>
          </v-flex>
        </v-layout>
</template>

计算错误消息示例:

websiteErrors() {
        console.log('websites',this.$v.websites) // contains $each
        const errors = []
        if (!this.$v.websites.$dirty) {
          return errors
        }
        // Issue is that all of them show must be valid, even if they are valid. 
        // Validation is basically broken.
        // I also tried this.$v.websites.$each.url
        !this.$v.websites.url && errors.push('Must be valid url')
        return errors
      },

示例方法(更新,也尝试了带有传递索引的方法):

websiteErrors(index) {
        console.log('this.$v.entity.websites', this.$v.entity.websites.$each.$iter, this.$v.entity.websites.$each.$iter[index], this.$v.entity.websites.minLength, this.$v.entity.websites.$each.$iter[index].url)
        const errors = []
        if (!this.$v.entity.websites.$dirty) {
          return errors
        }

        !this.$v.entity.websites.$each.$iter[index].url && errors.push('Must be valid url')
        return errors
      },

但是,当我这样做时,它始终是真实的,因此永远不会显示错误。

期望

我希望有一个与vuelidate sub-collection validation中所示的示例相同的示例,不同之处在于,不是循环进入我想以编程方式生成消息的模板。

参考

由vuelidate提供的示例:

import { required, minLength } from 'vuelidate/lib/validators'

export default {
  data() {
    return {
      people: [
        {
          name: 'John'
        },
        {
          name: ''
        }
      ]
    }
  },
  validations: {
    people: {
      required,
      minLength: minLength(3),
      $each: {
        name: {
          required,
          minLength: minLength(2)
        }
      }
    }
  }
}

<div>
  <div v-for="(v, index) in $v.people.$each.$iter">
    <div class="form-group" :class="{ 'form-group--error': v.$error }">
      <label class="form__label">Name for {{ index }}</label>
      <input class="form__input" v-model.trim="v.name.$model"/>
    </div>
    <div class="error" v-if="!v.name.required">Name is required.</div>
    <div class="error" v-if="!v.name.minLength">Name must have at least {{ v.name.$params.minLength.min }} letters.</div>
  </div>
  <div>
    <button class="button" @click="people.push({name: ''})">Add</button>
    <button class="button" @click="people.pop()">Remove</button>
  </div>
  <div class="form-group" :class="{ 'form-group--error': $v.people.$error }"></div>
  <div class="error" v-if="!$v.people.minLength">List must have at least {{ $v.people.$params.minLength.min }} elements.</div>
  <div class="error" v-else-if="!$v.people.required">List must not be empty.</div>
  <div class="error" v-else-if="$v.people.$error">List is invalid.</div>
  <button class="button" @click="$v.people.$touch">$touch</button>
  <button class="button" @click="$v.people.$reset">$reset</button>
  <tree-view :data="$v.people" :options="{rootObjectKey: '$v.people', maxDepth: 2}"></tree-view>
</div>

1 个答案:

答案 0 :(得分:2)

错误之处

  1. 共享的计算属性,这会导致所有兄弟姐妹共享同一错误消息的问题。 (通过内联编写解决)
  2. 由于未以“反应方式”更新阵列而未触发反应性(在这种情况下,请务必注意Change Detection Caveats而不是更新索引:我复制阵列,替换项目,然后设置整个数组。)
  3. 使用错误的vuelidate $each.$iter位置:将其从计算的错误消息移至v-for

解决方案

这是解决方法(固定1和3):

<template v-for="(v, index) in $v.websites.$each.$iter">
  <v-layout row :key="`website${index}`">
    <v-flex xs12 sm9 class="pr-3">
      <v-text-field
                    label="Website"
                    :value="v.$model.url"
                    @input="$v.websites.$touch()"
                    @blur="$v.websites.$touch()"
                    :error-messages="v.$dirty && !v.required ? ['This field is required'] : !v.url ? ['Must be a valid url'] : []"
      />
    </v-flex>
  </v-layout>
</template>

这是我现在的更新方法(修复2):

  updateWebsite(index, $event) {
    const websites = [...this.websites];
    websites[index] = $event;
    this.updateVuex(`websites`, websites)
    this.$v.websites.$touch()
  },

最初是这样的:

  updateWebsite(index, $event) {
    this.updateVuex(`websites[${index}]`, $event)
    this.$v.websites.$touch()
  },

替代

还有另一种选择,在这种情况下将website包装在组件内部。这样,您可以保留计算出的错误消息,因为它不会被共享。