how to implement Google Login API in VueJS?
data-onsuccess="onSignIn" is looking for a global onSignIn function. You need to put onSignIn outside of Vue component.
Another way is using gapi.signin2.render to render sign-in button, then you can use onSignIn inside Vue component:
<template> <div id="google-signin-button"></div></template><script>export default { mounted() { gapi.signin2.render('google-signin-button', { onsuccess: this.onSignIn }) }, methods: { onSignIn (user) { const profile = user.getBasicProfile() } }}</script>For more reference: https://developers.google.com/identity/sign-in/web/build-button
In case somebody needs a plugin to start working right away without too much setup, try this vue-google-signin-button-directive.