vuejs2 - Vue component data not updating from props -


i'm building spa scroll navigation being populated menu items based on section components.

in home.vue i'm importing scrollnav , sections this:

<template>     <div class="front-page">         <scroll-nav v-if="scrollnavshown" @select="changesection" :active-section="activeitem" :items="sections"></scroll-nav>         <fp-sections @loaded="buildnav" :active="activeitem"></fp-sections>     </div> </template>  <script>     import scrollnav '.././components/scrollnav.vue'     import fpsections './fpsections.vue'      export default {         data() {             return {                 scrollnavshown: true,                 activeitem: 'sectionone',                 scrollposition: 0,                 sections: []             }         },         methods: {             buildnav(sections) {                 this.sections = sections;                 console.log(this.sections)             },             changesection(e) {                 this.activeitem = e             },         },         components: {             scrollnav,             fpsections         }     }     </script>

this.sections empty, since i'm populating array data individual sections in fpsections.vue:

<template>     <div class="fp-sections">         <keep-alive>             <transition                 @enter="enter"                 @leave="leave"                 :css="false"                 >                 <component :is="activesection"></component>             </transition>         </keep-alive>     </div> </template>  <script>     import sectionone './sections/sectionone.vue'     import sectiontwo './sections/sectiontwo.vue'     import sectionthree './sections/sectionthree.vue'      export default {         components: {             sectionone,             sectiontwo,             sectionthree         },         props: {             active: string         },         data() {             return {                 activesection: this.active,                 sections: []             }         },         mounted() {             this.buildnav();         },         methods: {             buildnav() {                 let _components = this.$options.components;                 for(let prop in _components) {                     if(!_components[prop].hasownproperty('data')) continue;                     this.sections.push({                         title: _components[prop].data().title,                         name: _components[prop].data().name                     })                 }                 this.$emit('loaded', this.sections)             },             enter(el) {                 twm.to(el, .2, {                     autoalpha : 1                 })             },             leave(el, done) {                 twm.to(el, .2, {                     autoalpha : 0                 })             }         }     } </script>

the buildnav method loops through individual components' data , pushes scoped this.sections array emitted home.vue

back in home.vue this.sections populated data emitted fpsections.vue , passed prop.

when inspect vue devtools props passed down correctly data not update.

what missing here? data should react props when updated in parent right?

:active="activeitem"

this calld "dynamic prop" not dynamic data. set in once "oninit". reactivity can 

computed:{    activesection(){ return this.active;} }

or

watch: {     active(){     //do     } }

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