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Vue.js | Mixins

Vue.js Mixins


Hello folks! Welcome back to a new section of our tutorial on Vue.js. In this tutorial post, we will be studying about Vue.js Mixins.

Mixins are fundamentally to be made use of with components. They share reusable code among components. When a component uses mixin, all options of mixin becomes a part of the component options.

Example

Following below is a simple example -

<html>
   <head>
      <title>VueJs Instance</title>
      <script type = "text/javascript" src = "js/vue.js"></script>
   </head>
   <body>
      <div id = "databinding"></div>
      <script type = "text/javascript">
         var vm = new Vue({
            el: '#databinding',
            data: {
            },
            methods : {
            },
         });
         var myMixin = {
            created: function () {
               this.startmixin()
            },
            methods: {
               startmixin: function () {
                  alert("Welcome  to mixin example");
               }
            }
         };
         var Component = Vue.extend({
            mixins: [myMixin]
         })
         var component = new Component();
      </script>
   </body>
</html>

Output

Mixin


When a mixin and a component is made up of overlapping options, they are merged as shown in the following example.

<html>
   <head>
      <title>VueJs Instance</title>
      <script type = "text/javascript" src = "js/vue.js"></script>
   </head>
   <body>
      <div id = "databinding"></div>
      <script type = "text/javascript">
         var mixin = {
            created: function () {
               console.log('mixin called')
            }
         }
         new Vue({
            mixins: [mixin],
            created: function () {
               console.log('component called')
            }
         });
      </script>
   </body>
</html>

Now the mixin and the vue instance has the same method created. This is the output we see in the console

mixin_overlapping

If we happen to have same function name in methods, then the main vue instance will take priority.

Example

<html>
   <head>
      <title>VueJs Instance</title>
      <script type = "text/javascript" src = "js/vue.js"></script>
   </head>
   <body>
      <div id = "databinding"></div>
      <script type = "text/javascript">
         var mixin = {
            methods: {
               hellworld: function () {
                  console.log('In HelloWorld');
               },
               samemethod: function () {
                  console.log('Mixin:Same Method');
               }
            }
         };
         var vm = new Vue({
            mixins: [mixin],
            methods: {
               start: function () {
                  console.log('start method');
               },
               samemethod: function () {
                  console.log('Main: same method');
               }
            }
         });
         vm.hellworld();
         vm.start();
         vm.samemethod();
      </script>
   </body>
</html>

We will see mixin has a method property in which helloworld and samemethod function are defined. Comparably, vue instance has a methods property in which two methods are defined start and samemethod.

Each of the following methods are called.

vm.hellworld(); // In HelloWorld
vm.start(); // start method
vm.samemethod(); // Main: same method

As seen, we have called helloworld, start, and samemethod function. samemethod is also present in mixin, nevertheless, priority will be given to the main instance, as seen in the following console.

mixin_as_method


Alright guys! This is where we are going to be rounding up for this tutorial. In our next tutorial, we will be discussing about Vue.js Render Function.

Feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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Thanks for reading and bye for now.

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