How to use Facebook SDK with Nuxt.js?

Question

You can see my code.

npm install vue init nuxt/koa my-project (koa@2)

pages

 |- login.vue

<script>
export default {
  name: 'login',
  method: {
    login () {
      let vm = this
      FB.login(function (response) {
        vm.statusChangeCallback(response)
      }, {scope: 'publish_actions'})
    }
  },
  mounted () {
    console.log('mounted')
    let vm = this
    window.fbAsyncInit = () => {
      FB.init({
        appId: 'my-facebook-app-id',
        cookie: true,
        xfbml: true,
        version: 'v2.8'
      })
      FB.getLoginStatus(function (response) {
        vm.statusChangeCallback(response)
      })
    }

    (function(d, s, id){
      var js, fjs = d.getElementsByTagName(s)[0];
      if (d.getElementById(id)) {return;}
      js = d.createElement(s); js.id = id;
      js.src = "//connect.facebook.net/en_US/sdk.js";
      fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));
  }
}
</script>

but,

sdk.js:96 Uncaught TypeError: vm.statusChangeCallback is not a function

When using the Nuxt project (nuxt/koa), what is the best way to use the Facebook SDK?

Answer 1

I running into the same problem this day. Here is my solution with nuxt.js

First create a plugin plugins/fb-sdk.js

const vue_fb = {}
vue_fb.install = function install(Vue, options) {
    (function(d, s, id){
        var js, fjs = d.getElementsByTagName(s)[0]
        if (d.getElementById(id)) {return}
        js = d.createElement(s)
        js.id = id
        js.src = "//connect.facebook.net/en_US/sdk.js"
        fjs.parentNode.insertBefore(js, fjs)
        console.log('setting fb sdk')
    }(document, 'script', 'facebook-jssdk'))

    window.fbAsyncInit = function onSDKInit() {
        FB.init(options)
        FB.AppEvents.logPageView()
        Vue.FB = FB
        window.dispatchEvent(new Event('fb-sdk-ready'))
    }
    Vue.FB = undefined
}

import Vue from 'vue'

Vue.use(vue_fb, {
    appId: 'your-app-id',
    autoLogAppEvents: true,
    xfbml: true,
    version: 'v2.9'
})

We can use Vue.FB to invoke methods in FB SDK and listen to the fb-sdk-ready event in any component like this:

export default{
    data: function () {
        return {isFBReady: false}
    },
    mounted: function () {
        this.isFBReady = Vue.FB != undefined
        window.addEventListener('fb-sdk-ready', this.onFBReady)
    },
    beforeDestroy: function () {
        window.removeEventListener('fb-sdk-ready', this.onFBReady)
    },
    methods: {
        onFBReady: function () {
          this.isFBReady = true
        }
    }
}

Answer 2

I used combined inject to insert the plugin in the context (thus making it accessible in the store):

In plugins/fb-sdk.js:

const vue_fb = {}
vue_fb.install = function install(Vue, options) {
    (function(d, s, id){
        var js, fjs = d.getElementsByTagName(s)[0]
        if (d.getElementById(id)) {return}
        js = d.createElement(s)
        js.id = id
        js.src = "//connect.facebook.net/en_US/sdk.js"
        fjs.parentNode.insertBefore(js, fjs)
        console.log('setting fb sdk')
    }(document, 'script', 'facebook-jssdk'))

    window.fbAsyncInit = function onSDKInit() {
        FB.init(options)
        FB.AppEvents.logPageView()
        Vue.FB = FB
        window.dispatchEvent(new Event('fb-sdk-ready'))
        vue_fb.sdk = FB // do not forget this line
    }
    Vue.FB = undefined
}

import Vue from 'vue'

Vue.use(vue_fb, {
    appId: 'your-app-id',
    autoLogAppEvents: true,
    xfbml: true,
    version: 'v2.9'
})
// and this line
export default ({ app }, inject) => {
inject('fb', vue_fb)
}

Making it accessible through this.$fb

Answer 3

A plugin is a good way to inject some feature related logic into Vue instance but, I don't think your Vue instance has to have Facebook login logic all the time. I'd rather go with a login-with-facebook-button component like the following fashion;

<template>
  <v-btn v-if="facebookSdkReady" color="primary" dark type="button" @click="login">
    <v-layout mr-2>
      <v-icon name="brands/facebook"/>
    </v-layout>Login with Facebook
  </v-btn>
</template>

<script>
export default {
  name: 'LoginWithFacebook',

  data() {
    return {
      facebookSdkReady: false
    }
  },

  mounted() {
    const installFacebookSdkScript = (d, s, id) => {
      if (d.getElementById(id)) {
        this.facebookSdkReady = true
        return
      }
      let fjs = d.getElementsByTagName(s)[0]
      let js = d.createElement(s)
      js.id = id
      js.src = 'https://connect.facebook.net/en_US/sdk.js'
      fjs.parentNode.insertBefore(js, fjs)
    }
    installFacebookSdkScript(document, 'script', 'facebook-jssdk')

    window.fbAsyncInit = () => {
      FB.init({
        appId: '16653216336xxxxx',
        cookie: true,
        xfbml: true,
        version: 'v3.2'
      })

      FB.AppEvents.logPageView()
      this.facebookSdkReady = true
    }
  },

  methods: {
    // just a sample code copied from my code base.
    // here, you can replace this with your own.
    async login() {
      const url = await this.$store.dispatch('auth/fetchSocialLoginUrl', {
        provider: 'facebook'
      })

      window.location.href = url
    }
  }
}
</script>

Answer 4

Here's a solution which worked for me

First create a javascript file and include it in your static/js folder:

static/js/fb-sdk.js

include the script below in your fb-sdk.js file:

window.fbAsyncInit = function () {
  FB.init({
    appId: '<insert your app id>',
    autoLogAppEvents: true,
    xfbml: true,
    version: 'v2.10'
  })
  FB.AppEvents.logPageView()
};

(function (d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0]
  if (d.getElementById(id)) { return }
  js = d.createElement(s); js.id = id
  js.src = 'https://connect.facebook.net/en_US/sdk.js'
  fjs.parentNode.insertBefore(js, fjs)
}(document, 'script', 'facebook-jssdk'))

Finally in your nuxt.config.js, include the script at the header section:

module.exports = {
  head: {
    title: 'myTitle',
    meta: [
      { charset: 'utf-8' }
    ],
    script: [
     { src: '/js/fb-sdk.js' }
    ]
  }
}

You can now use window.FB to execute methods available in FB SDK in your components.