triggerValidation

Triggers the validation of a field or of the whole form on demand.

It does run the validations of the field until one of it fails, we maintain one error per field. If validating the form it continues with the next field.

Demo

Coming soon...

Usage

Along with `setValue`

vue

<template>
    <form>
        <input type="text" v-bind="register('name')" />
        <input type="email" v-bind="register('email',{
            pattern: {
                value: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i,
                message: 'Email field is not a valid regex'
            }
        })" />
        <button type="submit">Submit</button>
    </form>
</template>
<script setup lang="ts" >
import { watch } from 'vue'
import { useFormHandler } from 'vue-form-handler'

const { register, setValue, values, triggerValidation } = useFormHandler()

watch(
    () => values.name,
    (curr: string|null) => {
        await setValue('email', curr
            ? `${curr.toLowerCase().trim()}@mail.com`
            : 'Set a name first')
        triggerValidation('email')
    }
)
</script>

Just calling triggerValidation after a value is set ensures the validations are fired, remember to use await on setValue if you're expecting to intercept the value change so that it does trigger the validation when it should.

To validate the form on demand without submitting it

vue

<template>
    <form>
        <input type="email" v-bind="register('email', {
            required: true,
            pattern: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i
        })" />
        <p v-show="formState.errors.email">
            {{ formState.errors.email }}
        </p>
        <input type="number" v-bind="register('age', {
            required: true,
            min: 18,
            max: 50
        })" />
        <p v-show="formState.errors.age">
            {{ formState.errors.age }}
        </p>
        <textarea v-bind="register('description', {
            required: true,
            minLength: 15,
            maxLength: 300,
        })" />
        <p v-show="formState.errors.description">
            {{ formState.errors.description }}
        </p>
    </form>
    <button @click="() => triggerValidation()"></button>
</template>
<script setup lang="ts" >
import { useFormHandler } from 'vue-form-handler';

const { register, formState, triggerValidation } = useFormHandler();
</script>

All the fields get validated when triggering the validation without specifying any fieldName.

Type Declarations

export type TriggerValidation = (
    name?: string
) => Promise<void>

triggerValidation #

Demo #

Usage #

Along with setValue #

To validate the form on demand without submitting it #

Type Declarations #