问题
Ok i have tons of $http() calls all around the app code,
i'm wondering is there any way / best practice to detect when all $http() around the app have finished ( success/error donesn't matter what they return, just need to know if finished )?
So that i can show a loading gif until they are loading ?
thanks
回答1:
Do it like this:
angular.module('app').factory('httpInterceptor', ['$q', '$rootScope',
function ($q, $rootScope) {
var loadingCount = 0;
return {
request: function (config) {
if(++loadingCount === 1) $rootScope.$broadcast('loading:progress');
return config || $q.when(config);
},
response: function (response) {
if(--loadingCount === 0) $rootScope.$broadcast('loading:finish');
return response || $q.when(response);
},
responseError: function (response) {
if(--loadingCount === 0) $rootScope.$broadcast('loading:finish');
return $q.reject(response);
}
};
}
]).config(['$httpProvider', function ($httpProvider) {
$httpProvider.interceptors.push('httpInterceptor');
}]);
Then use event bound to $rootScope anywhere (preferable to use in directive):
$rootScope.$on('loading:progress', function (){
// show loading gif
});
$rootScope.$on('loading:finish', function (){
// hide loading gif
});
回答2:
It is possible if you execute all requests by $q.all
$scope.request1 = $http.get('request1URL', {cache: false});
$scope.request2 = $http.get('request2URL', {'cache': false});
$scope.loading = true;
$q.all([$scope.request1, $scope.request2]).then(function(values) {
$scope.loading = false;
// Do whatever you want
// values[0], values[1]
});
Using ng-if, you can show and hide loading gif.
In case, if you use different $http call, then have a count or array in the $rootScope and update them whenever $http complete. Based on the count or array.length enable the loading gif.
回答3:
Using answer by @karaxuna, I implement my solution like below. Plunker
<!doctype html>
<html ng-app="ui.bootstrap.demo">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular-animate.js"></script>
<script src="https://angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.14.3.js"></script>
<script>
var app = angular.module('ui.bootstrap.demo', ['ngAnimate', 'ui.bootstrap']);
app.config(['$httpProvider', function ($httpProvider) {
$httpProvider.interceptors.push(function ($q, $rootScope, $templateCache) {
var AjaxLoadingCount = 0;
return {
request: function (config) {
console.log("[config.interceptorService] request config", config);
if (++AjaxLoadingCount === 1)
{
if (!$templateCache.get(config.url)) {
$rootScope.$broadcast('AjaxLoading:Progress');
}
}
return config || $q.when(config);
},
requestError: function (rejection) {
console.log("[config.interceptorService] requestError rejection", rejection);
if(--AjaxLoadingCount === 0) $rootScope.$broadcast('AjaxLoading:Finish');
return $q.reject(rejection);
},
response: function (response) {
console.log("[config.interceptorService] response response", response);
if(--AjaxLoadingCount === 0) $rootScope.$broadcast('AjaxLoading:Finish');
return response || $q.when(response);
},
responseError: function (rejection) {
console.log("[config.interceptorService] responseError rejection", rejection);
if(--AjaxLoadingCount === 0) $rootScope.$broadcast('AjaxLoading:Finish');
return $q.reject(rejection);
}
};
});
}]);
app.factory('ajaxFactory', function ($http) {
var ajaxFactory = {};
ajaxFactory.LoadData = function () {
return $http({
method: "GET",
url: "http://www.w3schools.com/angular/customers.php",
});
};
return ajaxFactory;
});
app.controller('ModalDemoCtrl', function ($scope, ajaxFactory) {
$scope.doAjax = function () {
ajaxFactory.LoadData()
.success(function (data, status, headers, config) {
console.log("Data vai factory\n", JSON.stringify(data));
console.log("Loading finish.");
}).error(function (data, status, headers, config) {
});
};
});
app.directive("ajaxLoadingDirective", function ($uibModal) {
var modalInstance;
return {
restrict: 'EA', //E = element, A = attribute, C = class, M = comment
scope: true,
link: function (scope, elem, attrs) {
console.log("AjaxLoadingDirective.AjaxLoading:Progress");
scope.$on("AjaxLoading:Progress", function () {
modalInstance = $uibModal.open({
animation: true,
templateUrl: 'myModalContent.html'
});
});
return scope.$on("AjaxLoading:Finish", function () {
console.log("AjaxLoadingDirective.AjaxLoading:Finish");
if(modalInstance === undefined) return;
modalInstance.dismiss();
});
}
}
});
</script>
<link href="https://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div ng-controller="ModalDemoCtrl">
<script type="text/ng-template" id="myModalContent.html">
Loading data .......................
</script>
<button type="button" class="btn btn-default" ng-click="doAjax()">Execute Ajax</button>
<div ajax-loading-directive ></div>
</div>
</body>
</html>
来源：https://stackoverflow.com/questions/23361883/angular-js-detect-when-all-http-have-finished