Vue computed

var vm = new Vue({
  el: '#example',
  data: {
    message: 'Hello'
  },
  computed: {
    // a computed getter
    reversedMessage: function () {
      // `this` points to the vm instance
      return this.message.split('').reverse().join('')
    }
  }
})

Vue watch props

new Vue({
  el: '#app',
  data: {
    text: 'Hello'
  },
  components: {
    'child' : {
      template: `<p>{{ myprop }}</p>`,
      props: ['myprop'],
      watch: { 
      	myprop: function(newVal, oldVal) { // watch it
          console.log('Prop changed: ', newVal, ' | was: ', oldVal)
        }
      }
    }
  }
});

Source: stackoverflow.com

Vue add watcher

vm.$watch('person.name.firstName', function(newValue, oldValue) {
	alert('First name changed from ' + oldValue + ' to ' + newValue + '!');
});

Source: codingexplained.com

Similar codes

3 votes176 views1 answer
Vue.js force to reload re-render
Javascript Vue
0 vote151 views1 answer
Expect vue test utils compare objects
Javascript Vue
0 vote139 views1 answer
How to securely post form data to api vuejs
Javascript Vue
1 vote150 views1 answer
How to detect props change in vue
Javascript Vue
2 votes138 views2 answers
Vue + change router link active class
Javascript Vue
0 vote146 views2 answers
Vuelidate require if
Javascript Vue
0 vote139 views1 answer
Laravel vue global function
Javascript Vue
2 votes156 views1 answer
Button click redirection to another page vue
Javascript Vue
0 vote143 views1 answer
Vue js data property in component must be a function
Javascript Vue
0 vote144 views1 answer
Vuejs post
Javascript Vue