I'm trying to create a button in my program that toggles on a number of other things and removes itself once it's clicked. The relevant HTML is as follows:
<div id="app">
<button #click="reveal" v-if="!showlists">Start</button>
<ul v-if="showlists">
<list v-for="name in chosenNames" v-bind:name="name"></list>
</ul>
</div>
In this, the unordered list should be shown once the variable "showlists" is true and the button should be removed once "showlists" is true. My Vue app looks like this:
let app = new Vue({
el: "#app",
data: {
showlists: false,
chosenNames: [
{ text: "name1" },
{ text: "name2" },
{ text: "name3" },
]
},
methods: {
reveal: function() {
showlists = true;
}
}
})
Based on this, the "showlists" variable starts as false, and the program works as intended with the button showing and the list hidden. Once the button is clicked, the function runs and showlists is then set to true (I confirmed this in my troubleshooting efforts). However, once this occurs, the DOM does not dynamically update and instead just remains as it was at the start.
Sorry if this is something really basic, I'm very new to Vue and still trying to learn :)
Any and all help would be appreciated.
You have to use the "this" keyword in your "revel" method before showlists like this.showlists = true; variable in your "Vue" instance.
For example, you can write like as follows
<div id="app">
<button #click="reveal" v-if="!showlists">Start</button>
<ul v-if="showlists">
<list v-for="(name, index) in chosenNames" :name="name" :key="'list-'+index"></list>
</ul>
</div>
And for new "Vue" instance
let app = new Vue({
el: "#app",
data: {
showlists: false,
chosenNames: [
{ text: "name1" },
{ text: "name2" },
{ text: "name3" },
]
},
methods: {
reveal: function() {
this.showlists = true;
}
}
})
I hope that might solve the problem :)
your code has 4 bug:
v-bind is set element's attribute, not innerHTML
showlists need change to this.showlists
showlists = true; is always set to true
list isn't valid html tag, you need li
below is right code:
<div id="app">
<button #click="reveal" v-if="!showlists">Start</button>
<ul v-if="showlists">
<li v-for="name in chosenNames" v-html="name"></li>
</ul>
</div>
<script>
let app = new Vue({
el: "#app",
data: {
showlists: false,
chosenNames: [
{ text: "name1" },
{ text: "name2" },
{ text: "name3" },
]
},
methods: {
reveal: function() {
this.showlists = !this.showlists;
}
}
})
</script>
I've to use two external scripts for the payment gateways.
Right now both are put in the index.html file.
However, I don't want to load these files at the beginning itself.
The payment gateway is needed only in when user open a specific component (using router-view).
Is there anyway to achieve this?
Thanks.
A simple and effective way to solve this, it's by adding your external script into the vue mounted() of your component. I will illustrate you with the Google Recaptcha script:
<template>
.... your HTML
</template>
<script>
export default {
data: () => ({
......data of your component
}),
mounted() {
let recaptchaScript = document.createElement('script')
recaptchaScript.setAttribute('src', 'https://www.google.com/recaptcha/api.js')
document.head.appendChild(recaptchaScript)
},
methods: {
......methods of your component
}
}
</script>
Source: https://medium.com/#lassiuosukainen/how-to-include-a-script-tag-on-a-vue-component-fe10940af9e8
I have downloaded some HTML template that comes with custom js files and jquery. I had to attach those js to my app. and continue with Vue.
Found this plugin, it's a clean way to add external scripts both via CDN and from static files
https://www.npmjs.com/package/vue-plugin-load-script
// local files
// you have to put your scripts into the public folder.
// that way webpack simply copy these files as it is.
Vue.loadScript("/js/jquery-2.2.4.min.js")
// cdn
Vue.loadScript("https://maps.googleapis.com/maps/api/js")
using webpack and vue loader you can do something like this
it waits for the external script to load before creating the component, so globar vars etc are available in the component
components: {
SomeComponent: () => {
return new Promise((resolve, reject) => {
let script = document.createElement('script')
script.onload = () => {
resolve(import(someComponent))
}
script.async = true
script.src = 'https://maps.googleapis.com/maps/api/js?key=APIKEY&libraries=places'
document.head.appendChild(script)
})
}
},
UPDATE: This no longer works in Vue 3. You will receive this error:
VueCompilerError: Tags with side effect ( and ) are ignored in client component templates.
If you are trying to embed external js scripts to the vue.js component template, follow below:
I wanted to add a external JavaScript embed code to my component like this:
<template>
<div>
This is my component
<script src="https://badge.dimensions.ai/badge.js"></script>
</div>
<template>
And Vue showed me this error:
Templates should only be responsible for mapping the state to the UI. Avoid placing tags with side-effects in your templates, such as , as they will not be parsed.
The way I solved it was by adding type="application/javascript" (See this question to learn more about MIME type for js):
<script type="application/javascript" defer src="..."></script>
You may notice the defer attribute. If you want to learn more watch this video by Kyle
This can be simply done like this.
created() {
var scripts = [
"https://cloudfront.net/js/jquery-3.4.1.min.js",
"js/local.js"
];
scripts.forEach(script => {
let tag = document.createElement("script");
tag.setAttribute("src", script);
document.head.appendChild(tag);
});
}
You can use the vue-head package to add scripts, and other tags to the head of your vue component.
Its as simple as:
var myComponent = Vue.extend({
data: function () {
return {
...
}
},
head: {
title: {
inner: 'It will be a pleasure'
},
// Meta tags
meta: [
{ name: 'application-name', content: 'Name of my application' },
{ name: 'description', content: 'A description of the page', id: 'desc' }, // id to replace intead of create element
// ...
// Twitter
{ name: 'twitter:title', content: 'Content Title' },
// with shorthand
{ n: 'twitter:description', c: 'Content description less than 200 characters'},
// ...
// Google+ / Schema.org
{ itemprop: 'name', content: 'Content Title' },
{ itemprop: 'description', content: 'Content Title' },
// ...
// Facebook / Open Graph
{ property: 'fb:app_id', content: '123456789' },
{ property: 'og:title', content: 'Content Title' },
// with shorthand
{ p: 'og:image', c: 'https://example.com/image.jpg' },
// ...
],
// link tags
link: [
{ rel: 'canonical', href: 'http://example.com/#!/contact/', id: 'canonical' },
{ rel: 'author', href: 'author', undo: false }, // undo property - not to remove the element
{ rel: 'icon', href: require('./path/to/icon-16.png'), sizes: '16x16', type: 'image/png' },
// with shorthand
{ r: 'icon', h: 'path/to/icon-32.png', sz: '32x32', t: 'image/png' },
// ...
],
script: [
{ type: 'text/javascript', src: 'cdn/to/script.js', async: true, body: true}, // Insert in body
// with shorthand
{ t: 'application/ld+json', i: '{ "#context": "http://schema.org" }' },
// ...
],
style: [
{ type: 'text/css', inner: 'body { background-color: #000; color: #fff}', undo: false },
// ...
]
}
})
Check out this link for more examples.
With Vue 3, I use mejiamanuel57 answer with an additional check to ensure the script tag hasn't been loaded already.
mounted() {
const scripts = [
"js/script1.js",
"js/script2.js"
];
scripts.forEach(script => {
let tag = document.head.querySelector(`[src="${ script }"`);
if (!tag) {
tag = document.createElement("script");
tag.setAttribute("src", script);
tag.setAttribute("type", 'text/javascript');
document.head.appendChild(tag);
}
});
// ...
You can load the script you need with a promise based solution:
export default {
data () {
return { is_script_loading: false }
},
created () {
// If another component is already loading the script
this.$root.$on('loading_script', e => { this.is_script_loading = true })
},
methods: {
load_script () {
let self = this
return new Promise((resolve, reject) => {
// if script is already loading via another component
if ( self.is_script_loading ){
// Resolve when the other component has loaded the script
this.$root.$on('script_loaded', resolve)
return
}
let script = document.createElement('script')
script.setAttribute('src', 'https://www.google.com/recaptcha/api.js')
script.async = true
this.$root.$emit('loading_script')
script.onload = () => {
/* emit to global event bus to inform other components
* we are already loading the script */
this.$root.$emit('script_loaded')
resolve()
}
document.head.appendChild(script)
})
},
async use_script () {
try {
await this.load_script()
// .. do what you want after script has loaded
} catch (err) { console.log(err) }
}
}
}
Please note that this.$root is a little hacky and you should use a vuex or eventHub solution for the global events instead.
You would make the above into a component and use it wherever needed, it will only load the script when used.
NOTE: This is a Vue 2.x based solution. Vue 3 has stopped supporting $on.
Are you using one of the Webpack starter templates for vue (https://github.com/vuejs-templates/webpack)? It already comes set up with vue-loader (https://github.com/vuejs/vue-loader). If you're not using a starter template, you have to set up webpack and vue-loader.
You can then import your scripts to the relevant (single file) components. Before that, you have toexport from your scripts what you want to import to your components.
ES6 import:
- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import
- http://exploringjs.com/es6/ch_modules.html
~Edit~
You can import from these wrappers:
- https://github.com/matfish2/vue-stripe
- https://github.com/khoanguyen96/vue-paypal-checkout
The top answer of create tag in mounted is good, but it has some problems: If you change your link multiple times, it will repeat create tag over and over.
So I created a script to resolve this, and you can delete the tag if you want.
It's very simple, but can save your time to create it by yourself.
// PROJECT/src/assets/external.js
function head_script(src) {
if(document.querySelector("script[src='" + src + "']")){ return; }
let script = document.createElement('script');
script.setAttribute('src', src);
script.setAttribute('type', 'text/javascript');
document.head.appendChild(script)
}
function body_script(src) {
if(document.querySelector("script[src='" + src + "']")){ return; }
let script = document.createElement('script');
script.setAttribute('src', src);
script.setAttribute('type', 'text/javascript');
document.body.appendChild(script)
}
function del_script(src) {
let el = document.querySelector("script[src='" + src + "']");
if(el){ el.remove(); }
}
function head_link(href) {
if(document.querySelector("link[href='" + href + "']")){ return; }
let link = document.createElement('link');
link.setAttribute('href', href);
link.setAttribute('rel', "stylesheet");
link.setAttribute('type', "text/css");
document.head.appendChild(link)
}
function body_link(href) {
if(document.querySelector("link[href='" + href + "']")){ return; }
let link = document.createElement('link');
link.setAttribute('href', href);
link.setAttribute('rel', "stylesheet");
link.setAttribute('type', "text/css");
document.body.appendChild(link)
}
function del_link(href) {
let el = document.querySelector("link[href='" + href + "']");
if(el){ el.remove(); }
}
export {
head_script,
body_script,
del_script,
head_link,
body_link,
del_link,
}
And you can use it like this:
// PROJECT/src/views/xxxxxxxxx.vue
......
<script>
import * as external from '#/assets/external.js'
export default {
name: "xxxxxxxxx",
mounted(){
external.head_script('/assets/script1.js');
external.body_script('/assets/script2.js');
external.head_link('/assets/style1.css');
external.body_link('/assets/style2.css');
},
destroyed(){
external.del_script('/assets/script1.js');
external.del_script('/assets/script2.js');
external.del_link('/assets/style1.css');
external.del_link('/assets/style2.css');
},
}
</script>
......
Simplest solution is to add the script in the index.html file of your vue-project
index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>vue-webpack</title>
</head>
<body>
<div id="app"></div>
<!-- start Mixpanel --><script type="text/javascript">(function(c,a){if(!a.__SV){var b=window;try{var d,m,j,k=b.location,f=k.hash;d=function(a,b){return(m=a.match(RegExp(b+"=([^&]*)")))?m[1]:null};f&&d(f,"state")&&(j=JSON.parse(decodeURIComponent(d(f,"state"))),"mpeditor"===j.action&&(b.sessionStorage.setItem("_mpcehash",f),history.replaceState(j.desiredHash||"",c.title,k.pathname+k.search)))}catch(n){}var l,h;window.mixpanel=a;a._i=[];a.init=function(b,d,g){function c(b,i){var a=i.split(".");2==a.length&&(b=b[a[0]],i=a[1]);b[i]=function(){b.push([i].concat(Array.prototype.slice.call(arguments,
0)))}}var e=a;"undefined"!==typeof g?e=a[g]=[]:g="mixpanel";e.people=e.people||[];e.toString=function(b){var a="mixpanel";"mixpanel"!==g&&(a+="."+g);b||(a+=" (stub)");return a};e.people.toString=function(){return e.toString(1)+".people (stub)"};l="disable time_event track track_pageview track_links track_forms track_with_groups add_group set_group remove_group register register_once alias unregister identify name_tag set_config reset opt_in_tracking opt_out_tracking has_opted_in_tracking has_opted_out_tracking clear_opt_in_out_tracking people.set people.set_once people.unset people.increment people.append people.union people.track_charge people.clear_charges people.delete_user people.remove".split(" ");
for(h=0;h<l.length;h++)c(e,l[h]);var f="set set_once union unset remove delete".split(" ");e.get_group=function(){function a(c){b[c]=function(){call2_args=arguments;call2=[c].concat(Array.prototype.slice.call(call2_args,0));e.push([d,call2])}}for(var b={},d=["get_group"].concat(Array.prototype.slice.call(arguments,0)),c=0;c<f.length;c++)a(f[c]);return b};a._i.push([b,d,g])};a.__SV=1.2;b=c.createElement("script");b.type="text/javascript";b.async=!0;b.src="undefined"!==typeof MIXPANEL_CUSTOM_LIB_URL?
MIXPANEL_CUSTOM_LIB_URL:"file:"===c.location.protocol&&"//cdn.mxpnl.com/libs/mixpanel-2-latest.min.js".match(/^\/\//)?"https://cdn.mxpnl.com/libs/mixpanel-2-latest.min.js":"//cdn.mxpnl.com/libs/mixpanel-2-latest.min.js";d=c.getElementsByTagName("script")[0];d.parentNode.insertBefore(b,d)}})(document,window.mixpanel||[]);
mixpanel.init("xyz");
</script><!-- end Mixpanel -->
<script src="/dist/build.js"></script>
</body>
</html>
The answer from mejiamanuel57 is great, but I want to add a couple of tips that work in my case (I spent some hours on them). First, I needed to use the "window" scope. Also, if you need to access any Vue element inside the "onload" function, you need a new variable for the "this" instance.
<script>
import { mapActions } from "vuex";
export default {
name: "Payment",
methods: {
...mapActions(["aVueAction"])
},
created() {
let paywayScript = document.createElement("script");
let self = this;
paywayScript.onload = () => {
// call to Vuex action.
self.aVueAction();
// call to script function
window.payway.aScriptFunction();
};
// paywayScript.async = true;
paywayScript.setAttribute(
"src",
"https://api.payway.com.au/rest/v1/payway.js"
);
document.body.appendChild(paywayScript);
}
};
</script>
I worked with this on Vue 2.6. Here there is an explanation about how the trick "let self = this;" works in Javascript:
What does 'var that = this;' mean in JavaScript?
A fast and easy way that i found to do it is like this:
<template>
<div>Some HTML</div>
<component
src="https://unpkg.com/flowbite#1.5.3/dist/flowbite.js"
:is="'script'"
></component>
</template>
mounted() {
if (document.getElementById('myScript')) { return }
let src = 'your script source'
let script = document.createElement('script')
script.setAttribute('src', src)
script.setAttribute('type', 'text/javascript')
script.setAttribute('id', 'myScript')
document.head.appendChild(script)
}
beforeDestroy() {
let el = document.getElementById('myScript')
if (el) { el.remove() }
}
To keep clean components you can use mixins.
On your component import external mixin file.
Profile.vue
import externalJs from '#client/mixins/externalJs';
export default{
mounted(){
this.externalJsFiles();
}
}
externalJs.js
import('#JSassets/js/file-upload.js').then(mod => {
// your JS elements
})
babelrc (I include this, if any get stuck on import)
{
"presets":["#babel/preset-env"],
"plugins":[
[
"module-resolver", {
"root": ["./"],
alias : {
"#client": "./client",
"#JSassets": "./server/public",
}
}
]
}
If you're using Vue 3 and the Composition API (I highly recommend), and you're using <script> tags a lot, you can write a "composable" function for this:
import { onMounted } from "vue";
export const useScript = (src, async = false, defer = false) => {
onMounted(() => {
// check if script already exists
if (document.querySelector(`head script[src="${src}"`)) return;
// add tag to head
const tag = document.createElement("script");
tag.setAttribute("src", src);
if (async) tag.setAttribute("async", "");
if (defer) tag.setAttribute("defer", "");
tag.setAttribute("type", "text/javascript");
document.head.append(tag);
});
};
OR, if you are using VueUse (I also highly recommend), you can use their existing useScriptTag function.
You can use vue-loader and code your components in their own files (Single file components). This will allow you to include scripts and css on a component basis.
well, this is my practice in qiokian (a live2d anime figure vuejs component):
(below is from the file src/qiokian.vue)
<script>
export default {
data() {
return {
live2d_path:
'https://cdn.jsdelivr.net/gh/knowscount/live2d-widget#latest/',
cdnPath: 'https://cdn.jsdelivr.net/gh/fghrsh/live2d_api/',
}
},
<!-- ... -->
loadAssets() {
// load waifu.css live2d.min.js waifu-tips.js
if (screen.width >= 768) {
Promise.all([
this.loadExternalResource(
this.live2d_path + 'waifu.css',
'css'
),
<!-- ... -->
loadExternalResource(url, type) {
// note: live2d_path parameter should be an absolute path
// const live2d_path =
// "https://cdn.jsdelivr.net/gh/knowscount/live2d-widget#latest/";
//const live2d_path = "/live2d-widget/";
return new Promise((resolve, reject) => {
let tag
if (type === 'css') {
tag = document.createElement('link')
tag.rel = 'stylesheet'
tag.href = url
} else if (type === 'js') {
tag = document.createElement('script')
tag.src = url
}
if (tag) {
tag.onload = () => resolve(url)
tag.onerror = () => reject(url)
document.head.appendChild(tag)
}
})
},
},
}
There is a vue component for this usecase
https://github.com/TheDynomike/vue-script-component#usage
<template>
<div>
<VueScriptComponent script='<script type="text/javascript"> alert("Peekaboo!"); </script>'/>
<div>
</template>
<script>
import VueScriptComponent from 'vue-script-component'
export default {
...
components: {
...
VueScriptComponent
}
...
}
</script>
If you are attempting to utilize a variable that is defined within a JavaScript file that is being loaded asynchronously and you receive an 'undefined' error, it is likely because the script has not yet finished loading. To resolve this issue, you can utilize the onload function to ensure that the script has completed loading before attempting to access the variable. As an example:
const script = document.createElement(...) // set attribute and so on...
script.onload = () => {
// do something with some variables/functions/logic from the loaded script
}
You can use the head property in vue to return a custom script
export default {
head: {
script: [{
src: 'https://cdn.polygraph.net/pg.js',
type: 'text/javascript'
}]
}
}
I have a very specific need that cannot realy be solved with standard data-binding.
I've got a leaflet map that I want to bind with a vue view-model.
I succeeded to display geojson features kinda bounds to my view, but I'm struggling at displaying a popup bound with vue.js
The main question is : "How to open a popup (possibly multiple popups at the same time) and bind it to a view property "
For now I've come to a working solution, but this is aweful :
map.html
<div id="view-wrapper">
<div id="map-container"></div>
<div v-for="statement in statements" id="map-statement-popup-template-${statement.id}" style="display: none">
<map-statement-popup v-bind:statement="statement"></map-statement-popup>
</div>
</div>
<!-- base template for statement map popup -->
<script type="text/template" id="map-statement-popup-template">
{{ statement.name }}
</script>
map.js
$(document).ready(function() {
var map = new L.Map('map-container');
map.setView(new L.LatLng(GLOBALS.MAP.STARTCOORDINATES.lng, GLOBALS.MAP.STARTCOORDINATES.lat), GLOBALS.MAP.STARTZOOM);
var osm = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png');
osm.addTo(map);
//Initialize map dynamic layers
var mapLayers = {};
//View-model data-bindings
var vm = new Vue({
el: '#view-wrapper',
data: {
statements: []
},
methods: {
getStatements: function() {
return $.get('api/statements');
},
updateStatements: function() {
var that = this;
return that.getStatements().then(
function(res) {
that.statements = res.data;
}
);
},
refreshStatements: function() {
mapLayers.statements.layer.clearLayers();
if(this.statements && this.statements.length){
var geoJsonStatements = geoJsonFromStatements(this.statements);
mapLayers.statements.layer.addData(geoJsonStatements);
}
},
handleStatementFeature: function(feature, layer) {
var popupTemplateEl = $('#map-statement-popup-template-' + feature.properties.statement.id);
layer.bindPopup(popupTemplateEl.html());
var statementIndex = _.findIndex(this.statements, {statement:{id: feature.properties.statement.id}});
if(feature.geometry.type === 'LineString') {
this.statements[statementIndex].layer = {
id: L.stamp(layer)
};
}
},
openStatementPopup: function(statement) {
if(statement.layer) {
var featureLayer = mapLayers.statements.layer.getLayer(statement.layer.id);
featureLayer.openPopup();
}
}
},
created: function() {
var that = this;
//Set dynamic map layers
var statementsLayer = L.geoJson(null, {
onEachFeature: this.handleStatementFeature
});
mapLayers.statements = {
layer: statementsLayer
};
map.addLayer(mapLayers.statements.layer);
this.updateStatements().then(this.refreshStatements);
this.$watch('statements', this.refreshStatements);
},
components: {
'map-statement-popup': {
template: '#map-statement-popup-template',
props: {
statement: null
}
}
}
});
function geoJsonFromStatementsLocations(statements){
var geoJson = {
type: "FeatureCollection",
features: _.map(statements, function(statement) {
return {
type: "Feature",
geometry: {
type: "LineString",
coordinates: statement.coordinates
},
properties: {
statement: statement
}
};
});
};
return geoJson;
}
});
This seems pretty aweful to me, because I have to loop over statements with a v-for, render a div for my custom element for every statement, hide it, then use it in the popup, grabbing it with a dynamic id technique.
I would like to do something like this :
map.html
<div id="view-wrapper">
<div id="map-container"></div>
</div>
<!-- base template for statement map popup -->
<script type="text/template" id="map-statement-popup-template">
{{ statement.name }}
</script>
map.js
$(document).ready(function() {
[...]
//View-model data-bindings
var vm = new Vue({
el: '#view-wrapper',
data: {
statements: []
},
methods: {
handleStatementFeature: function(feature, layer) {
var popupTemplateEl = $('<map-statement-popup />');
var scope = { statement: feature.properties.statement };
var compiledElement = this.COMPILE?(popupTemplateEl[0], scope);
layer.bindPopup(compiledElement);
}
},
components: {
'map-statement-popup': {
template: '#map-statement-popup-template',
props: {
statement: null
}
}
}
});
function geoJsonFromStatementsLocations(statements){
var geoJson = {
type: "FeatureCollection",
features: _.map(statements, function(statement) {
return {
type: "Feature",
geometry: {
type: "LineString",
coordinates: statement.coordinates
},
properties: {
statement: statement
}
};
});
};
return geoJson;
}
});
... but I couldn't find a function to "COMPILE?" based on a defined scope. Basically I want to :
Create a custom element instance
Pass it a scope
Compile it
EDIT : Actually, I could find $compile function. But it's often used to compile appended child to html. I don't want to append it THEN compile it. I'd like to compile it then let leaflet append it for me.
Would this work for you? Instead of using a component, you create a new element to be passed to bindPopup, and you new Vue on that element, with your data set appropriately.
new Vue({
el: 'body',
data: {
popups: [1, 2, 3],
message: "I'm Dad",
statements: []
},
methods: {
handleFeature: function(id) {
const newDiv = document.createElement('div');
const theStatement = {
name: 'Some name for ' + id
};
newDiv.innerHTML = document.getElementById('map-statement-popup-template').innerHTML;
new Vue({
el: newDiv,
data: {
statement: theStatement
},
parent: this
});
// Mock call to layer.bindPopup
const layerEl = document.getElementById(id);
this.bindPopup(layerEl, newDiv);
},
bindPopup: function(layerEl, el) {
layerEl.appendChild(el);
}
}
});
<script src="//cdnjs.cloudflare.com/ajax/libs/vue/1.0.26/vue.min.js"></script>
<div class="leaflet-zone">
<div v-for="popup in [1,2,3]">
<button #click="handleFeature('p-' + popup)">Bind</button>
<div id="p-{{popup}}"></div>
</div>
</div>
<template id="map-statement-popup-template">
{{ statement.name }} {{$parent.message}}
</template>
I think you could do the same thing with $compile, but $compile is poorly (really un-) documented and intended for internal use. It is useful for bringing a new DOM element under control of the current Vue in the current scope, but you had a new scope as well as a new DOM element, and as you noted, that binding is exactly what Vue is intended to do.
You can establish a parent chain by specifying the parent option as I have updated my snippet to do.