title: What is the best way to use v-model without using it in the main app.js file?
body: <p>I was wondering i have this code inside my blade file:</p>
  <pre><code>&lt;input type=&quot;text&quot; class=&quot;form-control&quot; :model=&quot;productname&quot; id=&quot;name&quot; name=&quot;name&quot; aria-describedby=&quot;emailHelp&quot; placeholder=&quot;Title&quot; value=&quot;{{ old('name') }}&quot; required&gt;
  </code></pre>
  <p>and i want to create an 2 way data binding, so when user submitted 3 or more character to get an green background of this input field, but when they are less to get a red background.
  I tried to do this with vue-component, but it seems for whatever reason the vue-component does not have access to the main <code>#app</code> id which is assign to the main app blade template in order all vue code to have access to the html code and change it. I have created an vue-component called Upload inside ressources/assests/js/components/Upload.js, but when i write this code:</p>
  <pre><code>&lt;template&gt;
  &lt;/template&gt;
  
  &lt;script&gt;
      export default {
          data() {
              return {
                  productname: '',
              };
          },
          mounted() {
              console.log('Upload component', this.message);
          }
      }
  &lt;/script&gt;
  </code></pre>
  <p>and added of course to app.js like that <code>Vue.component('upload-component', require('./components/Upload.vue'));</code>
  and run - <code>npm run dev</code> to compile the code i am getting this error:</p>
  <blockquote>
  <p>[Vue warn]: Property or method &quot;productname&quot; is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: <a href="https://v2.vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties" rel="nofollow noreferrer">https://v2.vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties</a>.</p>
  </blockquote>
  <p>Whatever when i write this code inside the main app.js file (resources/assests/js/app.js):</p>
  <pre><code>const app = new Vue({
      el: '#app',
      data() {
              return {
                  productname: '',
              };
          },
  });
  </code></pre>
  <p>everything is working fine and i dont get any errors, but i dont want that, as imagine for my website/app i have to have for example 100 v-models and i dont want to put them all inside the main app.js file. <strong>Is there other way to do this?</strong></p>
  <ul>
  <li><p>Can i still somehow make it work inside the vue component, so the component can see the v-model and not giving me this error?</p>
  </li>
  <li><p>If not, can i make it work and use vue inside the blade file something like that?</p>
   
       new Vue({
       el: '#form',
       data: {
           productname: ''
       }
   });
   
  </li>
  </ul>
  <p>but this code its not working. Thanks!</p>