VueJS.vue

<!-- main.js -->

import Vue       from "vue";
import VueRouter from "vue-router";
import App       from "./App";

Vue.use(VueRouter);

new Vue({
    el        : "#app",
    template  : "<App/>",
    components: { App }
});

<!-- Login.vue -->

<template>
    <div class="ui middle aligned center aligned grid">
        <div class="column">
            <h2 class="ui teal header">
                Login
            </h2>

            <form class="ui large form login" v-on:submit.prevent="onSubmit">
                <div class="ui stacked segment">
                    <div class="field">
                        <div class="ui left icon input">
                            <i class="cloud icon"></i>
                            <input type="text" name="hostname" placeholder="Hostname" value="">
                        </div>
                    </div>

                    <div class="field">
                        <div class="ui left icon input">
                            <i class="user icon"></i>
                            <input type="text" name="username" placeholder="Username" value="">
                        </div>
                    </div>

                    <div class="field">
                        <div class="ui left icon input">
                            <i class="lock icon"></i>
                            <input type="password" name="password" placeholder="Password" value="">
                        </div>
                    </div>

                    <div class="ui fluid large teal submit button">Login</div>
                </div>
            </form>
        </div>
    </div>
</template>

<script>
    export default {
        name: "login",
        
        mounted: function() {
            this.$nextTick(function() {     
                jQuery(this.$el).find("form").form({
                    fields: {
                        hostname: {
                            identifier: "hostname",
                            rules     : [{
                                type  : "empty",
                                prompt: "Please enter the instance hostname"
                            }]
                        },

                        username: {
                            identifier: "username",
                            rules     : [{
                                type  : "empty",
                                prompt: "Please enter your username"
                            }]
                        },

                        password: {
                            identifier: "password",
                            rules     : [{
                                type  : "empty",
                                prompt: "Please enter your password"
                            }]
                        }
                    }
                });
            });
        },

        methods: {
            onSubmit: function(e) {
                alert("ok");
            }
        }
    };
</script>