问题
I am building up an mobile application using Ionic Framework and Cordova Sqlite. I am displaying the data from the sqlite database in an ionic list. Each of the ionic list item has a button to delete the corresponding item from the database. On the click of the button, the data gets deleted from the database, but it continues to appear in the ionic list, until I go back to some other view and come back to it. I need to refresh the view immediately and remove that item from the list also. Also, all my SQL codes are in controller, so I also need to reload the controller, it seems.
app.js
.state('app.cart', {
url: '/cart',
views: {
'menuContent': {
cache: false,
templateUrl: 'templates/cart.html',
controller: 'NFController'
}
}
})
controller.js
.controller('NFController', ['$scope', '$cordovaSQLite','$cordovaToast','$state','$stateParams', function($scope, $cordovaSQLite, $cordovaToast, $state,$stateParams) {
$scope.listItems= [];
$cordovaSQLite.execute(db, 'SELECT * FROM cart ORDER BY id DESC')
.then(
function(res) {
$scope.cartTotal=0;
$scope.crtPP=0;
if (res.rows.length > 0) {
for (var i=0; i<res.rows.length; i++) {
**$scope.crtPP=res.rows.item(i).productPrice*res.rows.item(i).productQuantity;
$scope.cartTotal=$scope.cartTotal+$scope.crtPP;
$scope.CProductName=res.rows.item(i).productName;
$scope.listItems.push(res.rows.item(i));**
}
}
else{
$scope.status = "No Products in the Cart";
}
},
function(error) {
$scope.statusMessage = "Error on loading: " + error.message;
}
);
$scope.remove = function(id) {
$cordovaSQLite.execute(db, 'DELETE from cart WHERE id=?', [id])
.then(function(res) {
//$state.go($state.current, {}, {reload: true});
var current = $state.current;
var params = angular.copy($stateParams);
$state.transitionTo(current, params, { reload: true, inherit: true, notify: true });
$cordovaToast.show('Removed from Cart','short','bottom');
}, function(error) {
console.log(error.message);
})
}
}])
remove() is called on the button click.
Updated Code :
.controller('NFController', ['$scope', '$cordovaSQLite','$cordovaToast', function($scope, $cordovaSQLite, $cordovaToast) {
$scope.listItems= [];
$cordovaSQLite.execute(db, 'SELECT * FROM cart ORDER BY id DESC')
.then(
function(res) {
$scope.cartTotal=0;
$scope.crtPP=0;
if (res.rows.length > 0) {
for (var i=0; i<res.rows.length; i++) {
$scope.listItems.push(res.rows.item(i));
}
cartTotal(); //cartTotal() called initially when the controller loads
console.log("Cart Total : " + $scope.cartTotal);
}
else{
console.log("####console######## NO results found #######"+"Table record #: ");
}
},
function(error) {
}
);
$scope.remove = function(id) {
$cordovaSQLite.execute(db, 'DELETE from cart WHERE id=?', [id])
.then(function(res) {
var index=$scope.listItems.indexOf(id)
$scope.listItems.splice(index,1);
cartTotal(); //CartTotal() called second time
$cordovaToast.show('Removed from Cart','short','bottom');
}, function(error) {
console.log(error.message);
})
console.log(id);
}
function cartTotal()
{
angular.forEach($scope.listItems, function(item, key) {
$scope.crtPP = item.productPrice * item.productQuantity;
$scope.cartTotal += $scope.crtPP;
console.log($scope.cartTotal);
});
}
}])
回答1:
When you execute the delete in your
$scope.remove = function(id) {
...
}
you don't need to the reload of the view. You can easily remove all this:
var current = $state.current;
var params = angular.copy($stateParams);
$state.transitionTo(current, params, { reload: true, inherit: true, notify: true });
you array of items $scope.listItems= []; should be bound to the view so you simply have to remove the item from the array or reload it and your view will update automatically.
$scope.remove = function(id) {
$cordovaSQLite.execute(db, 'DELETE from cart WHERE id=?', [id])
.then(function(res) {
$scope.listItems = <find the id in the list and remove it>;
$cordovaToast.show('Removed from Cart','short','bottom');
}, function(error) {
console.log(error.message);
})
}
instead of passing the id only to your $scope.remove method you can pass the whole item and use it to find the element in the array so it can be removed:
$scope.remove = function(item) {
$cordovaSQLite.execute(db, 'DELETE from cart WHERE id=?', [item.id])
.then(function(res) {
var index = $scope.listItems.indexOf(item);
$scope.listItems.splice(index, 1);
$cordovaToast.show('Removed from Cart','short','bottom');
}, function(error) {
console.log(error.message);
})
}
and your HTML:
<a class="btn" ng-click="remove(item)">Delete</a>
UPDATE:
Regarding the question in your comments, I would calculate the total using the array $scope.listItems.
I guess you have defined a property in your scope:
$scope.cartTotal = 0;
I would add a function:
function calculateCartTotal()
{
angular.forEach($scope.listItems, function(item, key) {
$scope.cartTotal += item.amount;
});
}
PS: item.amount or whatever your value is.
and recalculate after the splice:
$scope.remove = function(item) {
$cordovaSQLite.execute(db, 'DELETE from cart WHERE id=?', [item.id])
.then(function(res) {
var index = $scope.listItems.indexOf(item);
$scope.listItems.splice(index, 1);
calculateCartTotal();
$cordovaToast.show('Removed from Cart','short','bottom');
}, function(error) {
console.log(error.message);
})
}
If you cannot do that cause you don't have a value item.amount (or similar) you can always re-execute the query in that function and feed $scope.cartTotal.
UPDATE:
function cartTotal()
{
$scope.cartTotal = 0;
angular.forEach($scope.listItems, function(item, key) {
$scope.crtPP = item.productPrice * item.productQuantity;
$scope.cartTotal += $scope.crtPP;
console.log($scope.cartTotal);
});
}
来源：https://stackoverflow.com/questions/32883253/reload-view-and-controller-in-ionic-framework