Vue.js - Making helper functions globally available to single-file components
Solution 1
inside any component without having to first import them and then prepend this to the function name
What you described is mixin.
Vue.mixin({
methods: {
capitalizeFirstLetter: str => str.charAt(0).toUpperCase() + str.slice(1);
}
})
This is a global mixin. with this ALL your components will have a capitalizeFirstLetter
method, so you can call this.capitalizeFirstLetter(...)
from component methods or you can call it directly as capitalizeFirstLetter(...)
in component template.
Working example: http://codepen.io/CodinCat/pen/LWRVGQ?editors=1010
See the documentation here: https://vuejs.org/v2/guide/mixins.html
Solution 2
Otherwise, you could try to make your helpers function a plugin:
import Vue from 'vue'
import helpers from './helpers'
const plugin = {
install () {
Vue.helpers = helpers
Vue.prototype.$helpers = helpers
}
}
Vue.use(plugin)
In your helper.js
export your functions, this way:
const capFirstLetter = (val) => val.charAt(0).toUpperCase() + val.slice(1);
const img2xUrl = (val) => `${val.replace(/(\.[\w\d_-]+)$/i, '@2x$1')} 2x`;
export default { capFirstLetter, img2xUrl };
or
export default {
capFirstLetter(val) {
return val.charAt(0).toUpperCase() + val.slice(1);
},
img2xUrl(val) {
return `${val.replace(/(\.[\w\d_-]+)$/i, '@2x$1')} 2x`;
},
};
You should then be able to use them anywhere in your components using:
this.$helpers.capitalizeFirstLetter()
or anywhere in your application using:
Vue.helpers.capitalizeFirstLetter()
You can learn more about this in the documentation: https://vuejs.org/v2/guide/plugins.html
Solution 3
Create a new mixin:
"src/mixins/generalMixin.js"
Vue.mixin({
methods: {
capitalizeFirstLetter(str) {
return str.charAt(0).toUpperCase() + str.slice(1);
}
}
})
Then import it into your main.js like:
import '@/mixins/generalMixin'
From now on you will be able to use the function like this.capitalizeFirstLetter(str)
within your component script or without this
in a template. i.e.:
<template>
<div>{{ capitalizeFirstLetter('hello') }}</div>
</template>
You have to use this
because you mixed a method into the main Vue instance. If there are ways of removing this
it will probably involve something unconventional, this at least is a documented way of sharing functions which will be easy to understand for any future Vue devs to your project.
Solution 4
Using Webpack v4
Create a separate file for readability (just dropped mine in plugins folder). Reproduced from @CodinCat and @digout responses.
//resources/js/plugins/mixin.js
import Vue from 'vue';
Vue.mixin({
methods: {
capitalizeFirstLetter: str => str.charAt(0).toUpperCase() + str.slice(1),
sampleFunction() {
alert('Global Functions');
},
}
});
Then, import in your main.js or app.js file.
//app.js
import mixin from './plugins/mixin';
USAGE:
Call this.sampleFunction()
or this.capitalizeFirstLetter()
.
Solution 5
Use a global filter if it only concerns how data is formatted when rendered. This is the first example in the docs:
{{ message | capitalize }}
Vue.filter('capitalize', function (value) {
if (!value) return ''
value = value.toString()
return value.charAt(0).toUpperCase() + value.slice(1)
})
Ege Ersoz
Updated on October 20, 2021Comments
-
Ege Ersoz over 2 years
I have a Vue 2 project that has many (50+) single-file components. I use Vue-Router for routing and Vuex for state.
There is a file, called helpers.js, that contains a bunch of general-purpose functions, such as capitalizing the first letter of a string. This file looks like this:
export default { capitalizeFirstLetter(str) { return str.charAt(0).toUpperCase() + str.slice(1); } }
My main.js file initializes the app:
import Vue from 'vue' import VueResource from "vue-resource" import store from "./store" import Router from "./router" import App from "./components/App.vue" Vue.use(VueResource) const app = new Vue({ router: Router, store, template: '<app></app>', components: { App }, }).$mount('#app')
My App.vue file contains the template:
<template> <navbar></navbar> <div class="container"> <router-view></router-view> </div> </template> <script> export default { data() { return { // stuff } } } </script>
I then have a bunch of single-file components, which Vue-Router handles navigating to inside the
<router-view>
tag in the App.vue template.Now let's say that I need to use the
capitalizeFirstLetter()
function inside a component that is defined in SomeComponent.vue. In order to do this, I first need to import it:<template>Some Component</template> <script> import {capitalizeFirstLetter} from '../helpers.js' export default { data() { return { myString = "test" } }, created() { var newString = this.capitalizeFirstLetter(this.myString) } } </script>
This becomes a problem quickly because I end up importing the function into many different components, if not all of them. This seems repetitive and also makes the project harder to maintain. For example if I want to rename helpers.js, or the functions inside it, I then need to go into every single component that imports it and modify the import statement.
Long story short: how do I make the functions inside helpers.js globally available so that I can call them inside any component without having to first import them and then prepend
this
to the function name? I basically want to be able to do this:<script> export default { data() { return { myString = "test" } }, created() { var newString = capitalizeFirstLetter(this.myString) } } </script>
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Alexis.Rolland over 5 yearsIt would be nice to have more details in this answer like how do you store the mixin function in its own dedicated file and how do you import it in main.js?
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Marcelo Rodovalho about 5 yearsHow can I use
capitalizeFirstLetter
from aconst vm = new Vue()
instance? Becausevm.capitalizeFirstLetter
doesn't works. -
Daniel F almost 5 yearsWill all components be referencing the
capitalizeFirstLetter
function in the mixin or will they have their own copy of it? I'm looking for a place to store a function which should be accessible to every component, but otherwise be unrelated to them (fetch data from a server to store in a vuex storage) -
bArraxas over 4 yearsThanks ! It works well in components but not in "store.js". I have a mixin who customise the "console.log" : "log: str => console.log('%c ' + str + ' ', 'background:#aaa; color:#fff; padding: 5px; border-radius: 5px')". How can I use it in store.js please ?
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falselight over 4 yearsWho don't understand how to call: need added Vue.mixin in your main.js, not .vue file ;)
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Rifqi over 3 yearsHey, I tried your method but why I can't seem to access Vue.helpers ? this.$helpers is accessible. I need to access from outside component. Anyone can help me would be appreciated. Thanks