我点击此链接 https://developers.google.com/identity/sign-in/web/sign-in 在基于 Angular 的网站上获取 Google Signin。
我看到了一些奇怪的行为。登录按钮有时会显示，但并非总是显示。当我刷新页面时，只有五分之一的刷新会出现该按钮。
我在 Chrome 和 Safari 中尝试过，两者都有相同的行为。
代码：
index.html
<script src="https://apis.google.com/js/platform.js" async defer></script>
<meta name="google-signin-client_id" content="my_client_id">
登录.html
<div class="g-signin2" data-onsuccess="onSignIn"></div>
登录.js
angular.module('app').controller('LoginCtrl', function($scope) {
window.onSignIn = function(googleUser) {
// Get some info
}
});
我的猜测是，platform.js 脚本等待 DOM-ready 事件，然后使用“g-signin2”类查找您的 div。不过，在 Angularjs 中，事情有点不同。它有时起作用的原因是，有时你的 div 已由 Angular 渲染，有时在 Dom-ready 事件之前尚未渲染。 有 documentation 介绍如何使用您自己的 javascript 获得相同的结果。 我做了一个遵循您的路由的示例。
<!doctype html>
<html lang="en" ng-app="app">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div ng-view></div>
<script src="https://apis.google.com/js/platform.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.6/angular.min.js"></script>
<script src="https://code.angularjs.org/1.4.6/angular-route.min.js"></script>
<script>
angular.module('app',['ngRoute'])
.config(['$routeProvider',function($routeProvider){
$routeProvider
.when('/log-in', {
template: '<button ng-click="logInCtrl.onLogInButtonClick()">Log In</button>',
controller: 'LogInController',
controllerAs: 'logInCtrl'
}).otherwise({
redirectTo:'/log-in'
});
}])
.controller('LogInController',function(){
var self = this; //to be able to reference to it in a callback, you could use $scope instead
gapi.load('auth2', function() {//load in the auth2 api's, without it gapi.auth2 will be undefined
gapi.auth2.init(
{
client_id: 'CLIENT_ID.apps.googleusercontent.com'
}
);
var GoogleAuth = gapi.auth2.getAuthInstance();//get's a GoogleAuth instance with your client-id, needs to be called after gapi.auth2.init
self.onLogInButtonClick=function(){//add a function to the controller so ng-click can bind to it
GoogleAuth.signIn().then(function(response){//request to sign in
console.log(response);
});
};
});
});
</script>
</body>
</html>或作为指令：
<!doctype html>
<html lang="en" ng-app="app" ng-controller="MainController">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<google-sign-in-button on-sign-in="onSignIn(response)" g-client-id="CLIENTID.apps.googleusercontent.com"></google-sign-in-button>
<script src="https://apis.google.com/js/platform.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.6/angular.min.js"></script>
<script>
angular.module('app',[])
.controller('MainController',['$scope', function ($scope) {
$scope.onSignIn=function(response){
console.log(response);
}
}])
.directive('googleSignInButton',function(){
return {
scope:{
gClientId:'@',
callback: '&onSignIn'
},
template: '<button ng-click="onSignInButtonClick()">Sign in</button>',
controller: ['$scope','$attrs',function($scope, $attrs){
gapi.load('auth2', function() {//load in the auth2 api's, without it gapi.auth2 will be undefined
gapi.auth2.init(
{
client_id: $attrs.gClientId
}
);
var GoogleAuth = gapi.auth2.getAuthInstance();//get's a GoogleAuth instance with your client-id, needs to be called after gapi.auth2.init
$scope.onSignInButtonClick=function(){//add a function to the controller so ng-click can bind to it
GoogleAuth.signIn().then(function(response){//request to sign in
$scope.callback({response:response});
});
};
});
}]
};
});
</script>
</body>
</html>写完前面的例子后，我发现了一种更好、更简单的方法来实现它。使用此代码，您可以像平常一样继承相同的按钮。
<!doctype html>
<html lang="en" ng-app="app" ng-controller="MainController">
<head>
<meta charset="UTF-8">
<title>Document</title>
<meta name="google-signin-client_id" content="CLIENTID.apps.googleusercontent.com">
</head>
<body>
<google-sign-in-button button-id="uniqueid" options="options"></google-sign-in-button>
<script src="https://apis.google.com/js/platform.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.6/angular.min.js"></script>
<script>
angular.module('app', [])
.controller('MainController', ['$scope',
function($scope) {
//for more options visit https://developers.google.com/identity/sign-in/web/reference#gapisignin2renderwzxhzdk114idwzxhzdk115_wzxhzdk116optionswzxhzdk117
$scope.options = {
'onsuccess': function(response) {
console.log(response);
}
}
}
])
.directive('googleSignInButton', function() {
return {
scope: {
buttonId: '@',
options: '&'
},
template: '<div></div>',
link: function(scope, element, attrs) {
var div = element.find('div')[0];
div.id = attrs.buttonId;
gapi.signin2.render(div.id, scope.options()); //render a google button, first argument is an id, second options
}
};
});
</script>
</body>
</html>我找到了另一种方法来稍微简单地解决问题。
@sniel 的解释很完美，但我会让你知道更简单的解决方案。
您可以使用下面的示例代码，与使用 $watch 非常相似 https://developers.google.com/identity/sign-in/web/build-button
<!-- html part -->
<div id="signInButton"></div>
//gapi is Asynchronously loaded so you need to watch
$scope.$watch('gapi', function(newValue,oldVale){
if(newValue !== oldVale){
if(gapi){
gapi.signin2.render('signInButton',
{
'onsuccess': $scope.onSuccess,
'onfailure': $scope.onFailure,
'scope':'https://www.googleapis.com/auth/plus.login'
}
);
}
}
});
我遇到的问题是订单。 google 脚本在 DOM 元素准备好之前加载并执行。如果我在文档准备好后强制加载谷歌脚本文件，它就解决了我的问题。