角度$範圍變量未在回調中設置

Question

我無法弄清楚爲什麼範圍變量沒有被分配。

<script src="https://js.paystack.co/v1/inline.js"></script> 
<button type="button" ng-click="checkout()">Checkout</button> 
<div ng-show='txref'> 
    <h2>Payment successful!</h2> Transaction reference: {{txref}} 
</div> 

JS

//this function triggers when the button above is clicked. Everything else except assigning the reference to $scope.txref 
$scope.checkout = function() { 
    var handler = PaystackPop.setup({ 
    key: 'pk_test_1c828c1b8d9a98232c90d7aa6c418953c8150096', 
    email: 'customer@email.com', 
    amount: 10000 * 100, 
    ref: Math.floor((Math.random() * 100000) + 1), 
    callback: function(response){ 
     console.log(response.reference) //works 
     alert(response.reference) //works 
     $scope.txref = response.reference; //doesn't work until you click the button again 
    }, 
    onClose: function(){ 
     alert('window closed'); 
     } 
    }); 
    handler.openIframe(); 
} 

回調一切正常，除了分配參考$ scope.txref。它拒絕工作，但是當你再次點擊按鈕時，一切都是正常的。我不知道什麼是錯的。

Answer 1

添加$scope.$apply()更新摘要。這應該可以解決您的問題。同時啓動對範圍變量：

$scope.checkout = function() { 
    $scope.txref = ''; 
    var handler = PaystackPop.setup({ 
    key: 'pk_test_1c828c1b8d9a98232c90d7aa6c418953c8150096', 
    email: 'customer@email.com', 
    amount: 10000 * 100, 
    ref: Math.floor((Math.random() * 100000) + 1), 
    callback: function(response){ 
     console.log(response.reference) //works 
     alert(response.reference) //works 
     $scope.txref = response.reference; 
     $scope.$apply(); // <---- This should do the work for you 
    }, 
    onClose: function(){ 
     alert('window closed'); 
     } 
    }); 
    handler.openIframe(); 
} 

Answer 2

嘗試$timeout來包裝你的變量賦值例如，通知角有關的變化：

callback: function(response){ 
    console.log(response.reference) //works 
    alert(response.reference) //works 
    $timeout(function() { 
     $scope.txref = response.reference; //doesn't work until you click the button again 
    }); 
}, 

，不要忘記注入$超時到您的控制器，與$注入的方式相同