v-bind Directive in Vue.js

The v-bind directive is a Vuejs directive used to bind one or more attributes, or a component prop to an element. If that attribute is bound to our data defined in Vuejs instance then dynamic changes can be observed as data changes. First, we will create a div element with id as app, and let's apply the v-bind directive to an element. Further, we can use a button to execute a function when a click even occurs which will inverse the value of data.

Syntax:

v-bind:attribute="expression";

Since developers use this attribute too often, Vuejs provides a shorthand for this attribute as follows:

:attribute="expression";

Things we can do with v-bind:

• Multiple classes can be passed.
• Classes can be passed as arrays.
• Supports variables to be assigned as a condition for classes and props.
• Supports variable as arrays also.
• It can be used in child components also.
• Inline styles can also be assigned using v-bind.
  

Parameters: This directive accepts expression which will be deciding which attribute value to use. 
Example: This example uses Vuejs to toggle the classes of an element with v-bind. Further, we will use CSS to apply a different color to each class so that we can see them changing.

Output: