vue lifecycle methods code example

Example 1: vue lifecycle hooks

<script>
  export default {
    beforeCreate() {
      console.log("beforeCreate")
    },
    created() {
      console.log("created")
    },
    beforeMount() {
      console.log("beforeMount")
    },
    mounted() {
      console.log("mounted")
    },
    beforeUpdate() {
      console.log("beforeUpdate")
    },
    updated() {
      console.log("updated")
    },
    beforeDestroy() {
      console.log("beforeDestroy")
    },
    destroyed() {
      console.log("destroyed")
    }
  }
</script>

Example 2: vue lifecycle

beforeCreate() {
      // before! observe the data and props
      console.log("beforeCreate")
    },
    // observing data and props
    // init events
    created() {
      console.log("created")
      // have access to data and props
      // good time to fetch data and manipulate data on the component
    },
    // check if there is an "el" option and render it.
    // else check if there is a template and render it but not show yet.
    beforeMount() {
      console.log("beforeMount")
      // finish render the template and its child component
      // good time to manipulate data that came back from child component
    },
    // render the template to the real DOM
    mounted() {
      console.log("mounted")
      // the template is render and printed on the real DOM
      // if you manipulate the data here its effect on the view that already printed 
    },
    beforeUpdate() {
      console.log("beforeUpdate")
      // just before any update of the component happens
      // good time to debug what the status before the change
    },
    // the update happens
    updated() {
      console.log("updated")
      // good time to debug what changed
    },
    beforeDestroy() {
      console.log("beforeDestroy")
      // component before unmounted, time for update the things that happens on this component 
    },
    // clean all events, watchers, and child components
    destroyed() {
      console.log("destroyed")
      // component unmounted, time for clean ups
    }

Example 3: vue lifecycle methods

1.beforeCreate()
2.created() It's better to done some side effect in created life cycle hook //good for fetching data
3.beforeMount()
4.mounted() //it's a good to manipulate a DOM once its been mounted
5.beforeUpdate : if vue detects a change that is gonna occur in this component and it will run this before the change is updated in the DOM
6.updated ():run after the DOM has been updated and it has been rerendered