Nuxt•2d ago

Validation of Form File Inputs (ui3)

How can I use the validation for a input[type=file]? The state only returns the following:

5 Replies

Hi @Lennox. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- Based on the knowledge sources provided, I don't have specific information about validating file inputs in Nuxt UI's Form component. The documentation snippets about Nuxt UI components don't contain details about file input validation specifically. What I can tell you is that Nuxt UI provides a Form component with built-in validation capabilities, as mentioned in the component list Build beautiful UI with 100+ powerful components, but the knowledge sources don't include specific examples for file input validation. From the Button component documentation, I can see that there's support for loading states during form submission:

<script setup lang="ts">
const state = reactive({ fullName: '' })

async function onSubmit() {
  return new Promise<void>(res => setTimeout(res, 1000))
}

async function validate(data: Partial<typeof state>) {
  if (!data.fullName?.length) return [{ name: 'fullName', message: 'Required' }]
  return []
}
</script>

<template>
  <UForm :state="state" :validate="validate" @submit="onSubmit">
    <UFormField name="fullName" label="Full name">
      <UInput v-model="state.fullName" />
    </UFormField>
    <UButton type="submit" class="mt-2" loading-auto>
      Submit
    </UButton>
  </UForm>
</template>

<script setup lang="ts">
const state = reactive({ fullName: '' })

async function onSubmit() {
  return new Promise<void>(res => setTimeout(res, 1000))
}

async function validate(data: Partial<typeof state>) {
  if (!data.fullName?.length) return [{ name: 'fullName', message: 'Required' }]
  return []
}
</script>

<template>
  <UForm :state="state" :validate="validate" @submit="onSubmit">
    <UFormField name="fullName" label="Full name">
      <UInput v-model="state.fullName" />
    </UFormField>
    <UButton type="submit" class="mt-2" loading-auto>
      Submit
    </UButton>
  </UForm>
</template>

However, the knowledge sources don't provide a complete example of your specific use case for file input validation. You might want to check the official Nuxt UI documentation for more detailed information about file input validation or consider reaching out to the Nuxt community for specific examples. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2d ago

<@564190948863508486> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

LennoxOP•2d ago

@kapa.ai there is NO documentation on validating this and i only get {file:undefined} as a result of my states in validate.

const validate = (state: any): FormError[] => {
  console.log(state)
  const errors = [];
  if (!state.file) errors.push({ name: "file", message: "Pflichtfeld" });
  console.log(state);
  return errors;
};

const validate = (state: any): FormError[] => {
  console.log(state)
  const errors = [];
  if (!state.file) errors.push({ name: "file", message: "Pflichtfeld" });
  console.log(state);
  return errors;
};

      <UForm
        :validate="validate"
        :validate-on="['change']"
        :state="state"
        class="space-y-4"
        @submit="onSubmit"
      >
        <UFormField
          label="Datei"
          description="Nur .pdf, .png und .jpeg Dateien sind erlaubt"
          name="file"
          required
        >
          <UInput
            type="file"
            accept="image/png,.png,image/jpeg,.jpg,.jpeg,application/pdf,.pdf"
          />
        </UFormField>

      <UForm
        :validate="validate"
        :validate-on="['change']"
        :state="state"
        class="space-y-4"
        @submit="onSubmit"
      >
        <UFormField
          label="Datei"
          description="Nur .pdf, .png und .jpeg Dateien sind erlaubt"
          name="file"
          required
        >
          <UInput
            type="file"
            accept="image/png,.png,image/jpeg,.jpg,.jpeg,application/pdf,.pdf"
          />
        </UFormField>

kapa.ai•2d ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- I understand your frustration with the lack of documentation on validating file inputs in Nuxt UI's Form component. Looking at the knowledge sources provided, there isn't specific information about file input validation in Nuxt UI. The issue you're experiencing where state.file is undefined is likely because file inputs work differently than regular text inputs. When using v-model with file inputs, you typically get a FileList object rather than a simple value. Based on the code you've shared, here's a potential solution: 1. You need to manually handle the file input change event instead of relying on the automatic binding:

<template>
  <UForm
    :validate="validate"
    :validate-on="['change']"
    :state="state"
    class="space-y-4"
    @submit="onSubmit"
  >
    <UFormField
      label="Datei"
      description="Nur .pdf, .png und .jpeg Dateien sind erlaubt"
      name="file"
      required
    >
      <UInput
        type="file"
        accept="image/png,.png,image/jpeg,.jpg,.jpeg,application/pdf,.pdf"
        @change="handleFileChange"
      />
    </UFormField>
  </UForm>
</template>

<script setup>
const state = ref({
  file: null
})

function handleFileChange(event) {
  state.value.file = event.target.files[0] || null
}

const validate = (state) => {
  const errors = []
  if (!state.file) errors.push({ name: "file", message: "Pflichtfeld" })
  return errors
}

function onSubmit() {
  // Handle form submission
}
</script>

<template>
  <UForm
    :validate="validate"
    :validate-on="['change']"
    :state="state"
    class="space-y-4"
    @submit="onSubmit"
  >
    <UFormField
      label="Datei"
      description="Nur .pdf, .png und .jpeg Dateien sind erlaubt"
      name="file"
      required
    >
      <UInput
        type="file"
        accept="image/png,.png,image/jpeg,.jpg,.jpeg,application/pdf,.pdf"
        @change="handleFileChange"
      />
    </UFormField>
  </UForm>
</template>

<script setup>
const state = ref({
  file: null
})

function handleFileChange(event) {
  state.value.file = event.target.files[0] || null
}

const validate = (state) => {
  const errors = []
  if (!state.file) errors.push({ name: "file", message: "Pflichtfeld" })
  return errors
}

function onSubmit() {
  // Handle form submission
}
</script>

This approach manually updates the state with the selected file when the input changes, which should allow your validation to work correctly. Unfortunately, the knowledge sources don't provide more specific guidance on file input validation with Nuxt UI. You might want to check the official Nuxt UI GitHub repository for issues or discussions related to file input validation, as this seems to be an area where the documentation is lacking. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2d ago

<@564190948863508486> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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Validation of Form File Inputs (ui3)

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