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How Add Form validations in Vuejs

Here i am showing the form validation exams. need to follow mainly 4 stepes.


add v-bind:class = "{'is-invalid': validation_sensor}" v-model="sensor" to input field as well need to erorr after the validation add
message </b-form-invalid-feedback>


we need to define the validation_sensor:false by default, as defined in v-bind:class add this in script of your code

step-3: Need to write the If condition to check either it empty or not. If it empty prinit message.

step-4: add this Enter message to payload or send to API or What ever you want.

<template> <!-- Default form contact --> <form> <b-row> <b-col cols="12" xl="12"> <transition name="slide"> <b-card header-tag="header" footer-tag="footer"> <div slot="header"> <strong>Add Sensor</strong> <router-link to="/sensors"> <button type="button" class="btn btn-primary" style="float:right"> Back </button> </router-link> </div> <div> <!-- Default input Sensor--> <label for="defaultFormContactNameEx" class="grey-text">Sensor</label> <input type="text" id="defaultFormContactNameEx" v-bind:class = "{ 'is-invalid' : validation_sensor}" class="form-control" v-model="sensor"> <b-form-invalid-feedback> Please enter Sensor. </b-form-invalid-feedback> <br> <div class="text-center mt-4"> <button class="btn btn-outline-success" type="submit" @click="addModule()">Submit<i class="far fa-paper-plane ml-2"></i></button> </div> </div> </b-card> </transition> </b-col> </b-row> </form> <!-- Default form contact --> </template> <script> import axios from 'axios' import { URL } from '../../endpoints' export default { name: 'forms', data () { return { validation_sensor:false, sensor:'', } }, methods: { addModule() { if (this.sensor=='') { this.validation_sensor=true; } else{ this.validation_sensor=false; } if(this.sensor){ let payload = { sensor:this.sensor, } } else{ mandatory: true; return } axios.defaults.headers = { Authorization: `Bearer ${localStorage.getItem('token')}`, 'Content-Type': 'application/json', }; axios.post( URL ,payload) .then((response) => { this.loading = true; Swal.fire( 'Successful', 'Sensor Added Successfully !', 'success' ); this.$router.push('/sensors'); }).catch((err) => { this.resp_error=err.response.data this.loading = false; Swal.fire({ type: 'error', title: 'Oops...', text: 'Please Add Correct Infomation', }) }).catch(err => { if (err.response.status == 401) { const commit = 'logout' this.$store.dispatch('logout', { commit }) .then(() => this.$router.push('/')) .catch(err => console.log(err)) } console.log(err); }); }, }, } </script>