How to add external JS scripts to VueJS Components?
Mia Lopez 
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.
017 Answers
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', ') document.head.appendChild(recaptchaScript) }, methods: { ......methods of your component } }
</script>Source:
7I 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
// 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("")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 = '
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=""></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 = [ "", "js/local.js" ]; scripts.forEach(script => { let tag = document.createElement("script"); tag.setAttribute("src", script); 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', ') 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 ()? It already comes set up with 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:
-
-
~Edit~
You can import from these wrappers:
-
-
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: ' }, // ... ], // link tags link: [ { rel: 'canonical', href: ' 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": "" }' }, // ... ], style: [ { type: 'text/css', inner: 'body { background-color: #000; color: #fff}', undo: false }, // ... ] }
})Check out this link for more examples.
0The 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>
......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", "" ); 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?
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></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&&"//".match(/^\/\//)?"":"//";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>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); } }); // ...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", } } ]
}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() }
}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.
4well, 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: ' cdnPath: ' } },
<!-- ... --> 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 = // ""; //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
<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>
