What specific portion of the code will be transformed into a virtual DOM?

As a newcomer to the virtual DOM concept, I have been pondering how it functions over the past few days.

Let's envision that I have integrated a simple template engine like twig into my project, and I am utilizing vue.js as my chosen javascript framework. With this setup, I could construct the following page:

<div id="app">
    <p>Some text</p>
    <ul>
        <li v-for="item in items">{{ item }}</li>
    </ul>
    <component><component/>
</div>

<template id="component">
      <div class="center-xs">
          <div class="row">
               <div class="col-xs-12">
                   Some text
               </div>
          </div>
      </div>
</template>

<script>
   Vue.component('component', {
       template: '#component'
   });
   var app = new Vue({
        el: '#app',
        data: {
            items: ['item1', 'item2']
        }
    });
</script>

Now, let's reflect on which part of this code represents the Virtual DOM:

  • a. Nothing
  • b. Everything within #app
  • c. Items and component
  • d. Only component

Please enlighten me on your reasoning behind your choice. Feel free to share any resources, thoughts, or official documentation you may find helpful!

Thank you in advance!

Answer №1

In the realm of web development, it's vital to understand that the code residing within the <div id=app> - such as <p> and <ul> tags - isn't considered DOM straight away. It actually starts off as HTML markup which is then interpreted by the browser, ultimately transforming it into the Document Object Model (DOM). When Vue comes into play, any existing html code in the #app element becomes part of its template and thus seamlessly integrates with the Virtual DOM. However, elements like the <p> tag may be overlooked if they aren't engaged with any Vue operations.

If you've installed the Vue Devtools extension on your browser, you can witness a representation of the Virtual DOM in the components view. The top-level element, marked as <ROOT>, signifies your #app div while any other components are clearly visible. On the flip side, elements like <p> or <ul><li> won't show up in this view.

To maintain best practices, it's advisable to keep all html markup and component tags out of your root element. Simply employ <div id='app'></div> and let Vue take the lead in rendering all other elements exclusively via the Virtual DOM. This streamlined approach can be effortlessly achieved through the use of the `render` function.

new Vue({
  el: '#app',
  components: {
   TopLevelComponent
  },
  render: function(createElement) {
    return createElement(TopLevelComponent);
  }
})

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