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I'm new to vue and have been trying to include a google sign in button into my webpage. However, there is an error that states that "gapi is undefined" in my mounted(). How do i fix this? I've also tried initializing gapi but I don't know where to put that. 

<template>
     <div id = "signin"><div class="g-signin2">Sign in with LFA Email</div></div>
</div>

</template>
<script src=".js" async defer></script>
<script>
import UserDataService from "../services/UserDataService";
export default {
    data(){
        return {
            emailAddress:"",
            signedIn:false
        };
    },
     methods:{
        onSignIn(user){
            const profile = user.getBasicProfile()
            this.emailAddress =profile.getEmail()
            console.log(this.emailAddress)
            if(this.emailAddress.indexOf("@students")>-1){
                UserDataService.create(this.emailAddress)
                this.signedIn = true


            }
            else{
                alert("Please sign in with an LFA Email Account")
                var auth2 = gapi.auth2.getAuthInstance();
                auth2.signOut().then(function () {
                  console.log('User signed out.');
                });
                this.signedIn=false
            }

        }
      },
      mounted() {
          gapi.signin2.render('signin', {
               'scope': 'profile email',
               'width': 240,
               'height': 50,
               'longtitle': true,
               'theme': 'dark',
               'onsuccess': this.onSuccess,
          })

      }
}


</script>
<style>
@import '../../public/stylesheet.css';

</style>

I'm new to vue and have been trying to include a google sign in button into my webpage. However, there is an error that states that "gapi is undefined" in my mounted(). How do i fix this? I've also tried initializing gapi but I don't know where to put that. 

<template>
     <div id = "signin"><div class="g-signin2">Sign in with LFA Email</div></div>
</div>

</template>
<script src="https://apis.google./js/platform.js" async defer></script>
<script>
import UserDataService from "../services/UserDataService";
export default {
    data(){
        return {
            emailAddress:"",
            signedIn:false
        };
    },
     methods:{
        onSignIn(user){
            const profile = user.getBasicProfile()
            this.emailAddress =profile.getEmail()
            console.log(this.emailAddress)
            if(this.emailAddress.indexOf("@students")>-1){
                UserDataService.create(this.emailAddress)
                this.signedIn = true


            }
            else{
                alert("Please sign in with an LFA Email Account")
                var auth2 = gapi.auth2.getAuthInstance();
                auth2.signOut().then(function () {
                  console.log('User signed out.');
                });
                this.signedIn=false
            }

        }
      },
      mounted() {
          gapi.signin2.render('signin', {
               'scope': 'profile email',
               'width': 240,
               'height': 50,
               'longtitle': true,
               'theme': 'dark',
               'onsuccess': this.onSuccess,
          })

      }
}


</script>
<style>
@import '../../public/stylesheet.css';

</style>
  • javascript
  • html
  • vue.js
  • vuejs2
  • frontend
Share Improve this question asked Apr 8, 2020 at 12:36 Michael Xing '23Michael Xing '23 772 silver badges5 bronze badges 1
  • In my index.html I also have the client id. This is the tutorial I'm trying to follow. developers.google./identity/sign-in/web/build-button – Michael Xing '23 Commented Apr 8, 2020 at 12:38
Add a ment  | 

2 Answers 2

Reset to default 4

You can't put this tag <script src="https://apis.google./js/platform.js"></script> in Single File Component.

Put this tag in your public/index.html:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title>t-vue</title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but t-vue doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <script src="https://apis.google./js/platform.js"></script>
    <!-- built files will be auto injected -->
  </body>
</html>

Besides that, you need also to remove the attributes async and defer. Because when you call the gapi variable in mounted the script didn't download yet.

The correct script is: <script src="https://apis.google./js/platform.js"></script>

PS: I create a minimal example that works for me, try this in your puter:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="https://cdn.jsdelivr/npm/vue/dist/vue.js"></script>
  </head>
  <body>
    <div id="app">
      <button @click="test">Click Here</button>
    </div>
    <script src="https://apis.google./js/platform.js"></script>
    <script>
      let app = new Vue({
        el: '#app',
        methods: {
          test() {
            console.log('method', gapi);
          },
        },
        mounted() {
          console.log('mounted', gapi);
        },
      });
    </script>
  </body>
</html>

Not sure if you still need help with this, but I had to explicitly assign the gapi variable I see in all these examples to window.gapi by doing this at the beginning of the Mounted() method:

let gapi = window.gapi

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