英文:
Validate a form before submit in Vue3 composition api with vuelidate
问题
根据您提供的信息,您在使用Vue.js 3的Composition API和Vuelidate进行表单验证时遇到了问题。您尝试在submitHandler()中调用v$.$validate()时遇到了错误。问题可能在于Vuelidate在Vue.js 3中的使用方式略有不同。
在Vue.js 3中,Vuelidate的使用可能需要略微不同。在Vue.js 3的Composition API中,您可以尝试以下方式来进行表单验证:
首先,确保您已经正确导入了Vuelidate库和所需的验证规则,就像您在代码中所示的那样。
然后,您可以使用withValidation函数来创建一个包装了验证方法的对象。在setup函数中使用withValidation,并将其绑定到表单数据上,如下所示:
import { withValidation } from '@vuelidate/core';
const { $v } = withValidation();
const state = reactive({
  productName: '',
  productPrice: '',
  // 其他表单字段
});
// 在模板中使用 $v 代替 v$
接下来,您可以在模板中使用$v对象来访问表单字段的验证方法,如下所示:
<form @submit="submitHandler">
  <input
    v-model="state.productName"
    :class="{ error: $v.state.productName.$invalid && $v.state.productName.$dirty }"
  >
  <input
    v-model="state.productPrice"
    :class="{ error: $v.state.productPrice.$invalid && $v.state.productPrice.$dirty }"
  >
  <!-- 其他表单字段 -->
  <button type="submit">Submit</button>
</form>
最后,您可以在submitHandler中调用$v.$validate()来执行表单验证,就像这样:
const submitHandler = async () => {
  try {
    const isFormCorrect = await $v.$validate();
    if (!isFormCorrect) {
      // 显示适当的错误消息或处理验证不通过的情况
      console.log('Form validation failed');
      return;
    }
    // 提交表单的逻辑
    console.log('Form submitted');
  } catch (error) {
    console.warn({ error });
  }
};
这种方式应该在Vue.js 3的Composition API中有效,以执行表单验证和处理提交操作。希望这能帮助您解决问题。如果您需要更多的帮助或有其他问题,请随时提问。
英文:
According to documentation example there is the following Vue.js options api way to validate the whole form before submitting it
export default {
  methods: {
    async submitForm () {
      const isFormCorrect = await this.v$.$validate()
      // you can show some extra alert to the user or just leave the each field to show it's `$errors`.
      if (!isFormCorrect) return
      // actually submit form
    }
  }
}
I am using Vue.js 3 with composition api and simply can't make this work in my case.
In my <template> i have a form
<form
  @submit="submitHandler"
>
  <input>
    :error="v$.productName.$invalid && v$.productName.$dirty"
    @input="v$.productName.$touch()"
  </input>
  
  <input>
    :error="v$.productPrice.$invalid && v$.productPrice.$dirty"
    @update:model-value="v$.productPrice.$touch()"
  </input>
  ...
</form>
Under <script setup> tag i have the following
import { useVuelidate } from '@vuelidate/core'
import { required, integer, minValue } from '@vuelidate/validators'
...
const state = reactive({
  productName: '',
  productPrice: '',
  
  ...
})
const rules = {
  productName: { required, $lazy: true },
  productPrice: { required, integer, minValue: minValue(1), $lazy: true },
  
  ...
  $validationGroups: {
    allProductData: [
      'productName',
      'productPrice' ,
      
      ...
    ]
  }
}
const v$ = useVuelidate(rules, state)
...
const submitHandler = async () => {
  try {
    const isFormCorrect = await v$.$validate()
    console.log('Submit Fired')
  } catch (error) {
    console.warn({error})
  }
}
submitHandler() gives me an error saying error: TypeError: v$.$validate is not a function. I tried with and without making it async and got the same error.
I also tried to place the same code directly in the <form> @click event handler and it works perfectly fine.
<form
  @submit="v$.validate()"
>
...
</form>
Am i missing something ? It seems to me like vuelidate2 v$.methodName() only works in the template which is strange because i recall using it exactly as documentation suggests in my Vue.js 2 applications
答案1
得分: 2
useVuelidate返回一个ref,虽然文档不是很清楚,但可以从一个响应式组合中期待到这个结果。
在模板中,ref会自动解包,但在脚本中,应该这样写:
const isFormCorrect = await unref(v$).$validate()
英文:
useVuelidate returns a ref, this is not well-documented but can be expected from a reactive composable.
Refs are automatically unwrapped in a template, in a script it's supposed to be:
const isFormCorrect = await unref(v$).$validate()
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