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              <form id="app" @submit="checkForm" action="/something" method="post" novalidate="true">
  <p v-if="errors.length">
    <b>Please correct the following error(s):</b>
      <li v-for="error in errors">{{ error }}</li>

    Given a budget of 100 dollars, indicate how much
    you would spend on the following features for the
    next generation Star Destroyer:

    <input type="number" name="weapons" v-model.number="weapons"> Weapons <br/>
    <input type="number" name="shields" v-model.number="shields"> Shields <br/>
    <input type="number" name="coffee" v-model.number="coffee"> Coffee <br/>
    <input type="number" name="ac" v-model.number="ac"> Air Conditioning <br/>
    <input type="number" name="mousedroids" v-model.number="mousedroids"> Mouse Droids <br/>

    Current Total: {{total}}

    <input type="submit" value="Submit">  


              input {
  margin-left: 10px;
  width: 50px;

input[type=submit] {
  width: 100px;
              const app = new Vue({
     total:function() {
       //must parse cuz Vue turns empty value to string
       return Number(this.weapons)+
    checkForm:function(e) {
      this.errors = [];
      if(this.total != 100) this.errors.push("Total must be 100!");
      if(!this.errors.length) return true;
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