# Forms

**Form Validation:**

When it comes to form validation, Vuetify has a multitude of integrations and baked in functionality. Want to use a 3rd party validation plugin? Out of the box you can use [Vee-validate](https://github.com/baianat/Vee-validate) and [vuelidate](https://github.com/vuelidate/vuelidate).

The  `v-form` component makes it easy to add validation to form inputs. All input components have a `rules` prop which takes an array of functions. These functions allow you to specify conditions in which the field is *valid* or *invalid*. Whenever the value of an input is changed, each function in the array will receive the new value. If a function returns false or a string, validation has failed.

```markup
<template>
  <v-form v-model="valid">
    <v-container>
      <v-row>
        <v-col
          cols="12"
          md="4"
        >
          <v-text-field
            v-model="firstname"
            :rules="nameRules"
            :counter="10"
            label="First name"
            required
          ></v-text-field>
        </v-col>
        <v-col
          cols="12"
          md="4"
        >
          <v-text-field
            v-model="lastname"
            :rules="nameRules"
            :counter="10"
            label="Last name"
            required
          ></v-text-field>
        </v-col>
        <v-col
          cols="12"
          md="4"
        >
          <v-text-field
            v-model="email"
            :rules="emailRules"
            label="E-mail"
            required
          ></v-text-field>
        </v-col>
      </v-row>
    </v-container>
  </v-form>
</template>
```

**Stepper:**

The `v-stepper` component displays progress through numbered steps.

```markup
<template>
  <v-stepper v-model="e1">
    <v-stepper-header>
      <v-stepper-step :complete="e1 > 1" step="1">Name of step 1</v-stepper-step>
      <v-divider></v-divider>
      <v-stepper-step :complete="e1 > 2" step="2">Name of step 2</v-stepper-step>
      <v-divider></v-divider>
      <v-stepper-step step="3">Name of step 3</v-stepper-step>
    </v-stepper-header>
    <v-stepper-items>
      <v-stepper-content step="1">
        <v-card
          class="mb-12"
          color="grey lighten-1"
          height="200px"
        ></v-card>
        <v-btn
          color="primary"
          @click="e1 = 2"
        >
          Continue
        </v-btn>
        <v-btn text>Cancel</v-btn>
      </v-stepper-content>
      <v-stepper-content step="2">
        <v-card
          class="mb-12"
          color="grey lighten-1"
          height="200px"
        ></v-card>
        <v-btn
          color="primary"
          @click="e1 = 3"
        >
          Continue
        </v-btn>
        <v-btn text>Cancel</v-btn>
      </v-stepper-content>
      <v-stepper-content step="3">
        <v-card
          class="mb-12"
          color="grey lighten-1"
          height="200px"
        ></v-card>
        <v-btn
          color="primary"
          @click="e1 = 1"
        >
          Continue
        </v-btn>
        <v-btn text>Cancel</v-btn>
      </v-stepper-content>
    </v-stepper-items>
  </v-stepper>
</template>
```


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