How to listen for 'props' changes

Question

In the VueJs 2.0 docs I can't find any hooks that would listen on props changes.

Does VueJs have such hooks like onPropsUpdated() or similar?

Update

As @wostex suggested, I tried to watch my property but nothing changed. Then I realized that I've got a special case:

<template>     <child :my-prop="myProp"></child> </template>  <script>    export default {       props: ['myProp']    } </script> 

I am passing myProp that the parent component receives to the child component. Then the watch: {myProp: ...} is not working.

Answer 1

You can watch props to execute some code upon props changes:

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)          }        }      }    }  });

<script src="https://unpkg.com/vue/dist/vue.js"></script>    <div id="app">    <child :myprop="text"></child>    <button @click="text = 'Another text'">Change text</button>  </div>