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

0 vote346 views1 answer
Adding jquery to vuepress
Javascript Vue
0 vote329 views1 answer
Re init data vue js
Javascript Vue
0 vote332 views1 answer
Vue js app component
Javascript Vue
1 vote344 views1 answer
Vue dynamic route push with params
Javascript Vue
1 vote330 views1 answer
Biding multiple class vuejs
Javascript Vue
0 vote342 views1 answer
How to include a toasted property in vue
Javascript Vue
1 vote358 views1 answer
Live vue js port number
Javascript Vue
31 votes451 views5 answers
Inline style vue
Javascript Vue
2 votes334 views2 answers
Access data out of Axios .then vue.js
Javascript Vue
10 votes407 views2 answers
Vuejs does props factory function have access to vue instance
Javascript Vue