Vue3: How to get error messages with Bootstrap and VeeValidate 4? - forms

Question

I want to use vue3 together with bootstrap 4/5 with veevalidate 4.
<template>
<Form as="form" #submit.prevent="onFormSubmit" class="needs-validation" :class="{ 'was-validated': wasValidated }">
<div class="form-group">
<label for="firstNameId">First Name *</label>
<Field name="firstname" as="input" id="firstNameId" type="text" rules="required|firstname" class="form-control" placeholder="First Name" v-model="firstName" aria-describedby="input-true input-false input-help" aria-invalid="true" />
<ErrorMessage as="div" name="firstname" v-slot="{ message }">
{{ message }}
<div class="invalid-feedback">
{{ message }}
</div>
</ErrorMessage>
<div class="valid-feedback">Good!</div>
</div>
<Form>
</template>
<script>
import { Field, Form, ErrorMessage, defineRule } from 'vee-validate';
defineRule('required', value => {
if (!value || !value.length) {
return 'This field is required.';
}
return true;
});
defineRule("firstname", (value) => {
if (!/^[a-zA-Z0-9( ),'.:/-]+$/i.test(value)) {
return "Please use only letters, numbers and the following special characters: ( ),'.:/-";
}
return true;
});
export default {
components: {
Form,
Field,
ErrorMessage
},
data () {
return {
firstName: "",
wasValidated: false,
},
methods: {
onFormSubmit(values) {
alert(JSON.stringify(values, null, 2));
console.log("Submitted");
console.log(values);
var forms = document.getElementsByClassName('needs-validation');
// Loop over them and prevent submission
var validation = Array.prototype.filter.call(forms, function(form) {
form.addEventListener('submit', function(event) {
if (form.checkValidity() === false) {
event.preventDefault();
event.stopPropagation();
}
this.wasValidated = true;
}, false);
});
},
},
};
</script>
The problem is that I can't activate the div with the class invalid-feedback or valid-feedback.
I could add the class was-validated to the <form>-tag, but I get feedback first after the second click on the submit button.

Answer 1

<template>
<Form as="form"
#submit="onFormSubmit"
class="needs-validation"
:validation-schema="schema"
v-slot="{ errors }"
>
<div class="form-group">
<label for="firstNameId">First Name *</label>
<Field
name="firstName"
type="text"
placeholder="First Name"
v-model="firstName"
aria-describedby="input-true input-false input-help"
aria-invalid="true"
v-slot="{ meta, field }"
>
<input
v-bind="field"
name="firstName"
type="text"
class="form-control"
:class="{
'is-valid': meta.valid && meta.touched,
'is-invalid': !meta.valid && meta.touched,
}"
/>
</Field>
<ErrorMessage as="div" name="firstname" v-slot="{ message }" class="invalid-feedback">
{{ message }}
</ErrorMessage>
<Form>
</template>
<script setup>
import { markRaw } from 'vue';
import { Field, Form, ErrorMessage} from 'vee-validate';
import * as yup from 'yup';
</script>
<script>
export default {
components: {
Form,
Field,
ErrorMessage
},
data () {
return {
schema: markRaw(yup.object().shape({
firstName: yup.string().min(0).max(20).label('First Name'),
})),
};
},
methods: {
onFormSubmit(values) {
console.log(JSON.stringify(values, null, 2));
},
},
};
</script>