我创建了一个小功能,让用户可以搜索电影。这会从tmdb.org发出JSON请求,返回标题,日期和网址海报等内容。
控制器:
angular.module('movieSeat')
.factory('moviesearchFactory', ['$http', '$q', '$rootScope', function ($http, $q, $rootScope) {
var factory = {};
function httpPromise(url) {
var deferred = $q.defer();
$http({
method: 'JSONP',
url: url
})
.success(function (data) {
deferred.resolve(data.results);
})
.error(function () {
deferred.reject();
});
return deferred.promise;
}
factory.getMovies = function (searchquery) {
return httpPromise('http://api.themoviedb.org/3/' + 'search/movie?api_key=a8f7039633f2065942cd8a28d7cadad4' + '&query=' + encodeURIComponent(searchquery) + '&callback=JSON_CALLBACK')
}
return factory;
}]);
工厂:
angular.module('movieSeat')
.controller('moviesearchCtrl', ['$scope', 'moviesearchFactory', function ($scope, moviesearchFactory) {
$scope.createList = function (searchquery) {
$scope.loading = true;
moviesearchFactory.getMovies(searchquery)
.then(function (response) {
$scope.movies = response;
})
.finally(function () {
$scope.loading = false;
});
}
}]);
模板:
<div ng-controller="moviesearchCtrl" id="movieSearch">
<div class="spinner" ng-show="loading">Loading</div>
<input ng-model="searchquery" ng-change="createList(searchquery)" ng-model-options="{ debounce: 500 }" />
{{ search }}
<ul>
<li ng-if="movie.poster_path" ng-repeat="movie in movies | orderBy:'-release_date'">
<span class="title">{{ movie.title }}</span>
<span class="release_date">{{ movie.release_date }}</span>
<img ng-src="https://image.tmdb.org/t/p/w300_and_h450_bestv2/{{ movie.poster_path }}" class="poster"/>
</li>
</ul>
</div>
此功能的问题是spinner类只等待请求的数据。但是加载一些JSON并不需要很长时间,它会在浏览器中从api下载图像需要一段时间。
这导致两件事。在浏览器中渲染图像之前,首先移除微调器,因为图像都是异步加载的,因此会产生瀑布效果。
解决此问题的最简单方法是延迟控制器中的.then
呼叫,直到为用户下载图像,然后进入.finally
呼叫。
但我无法找到创造类似内容的方法。有什么提示吗?
答案 0 :(得分:1)
试试这个让我知道:
我们的想法是使用一个指令来发出一个渲染完成的事件:
dashboard.directive('onFinishRender', function ($timeout) {
return {
restrict: 'A',
link: function (scope, element, attr) {
if (scope.$last === true) {
$timeout(function () {
scope.$emit(attr.onFinishRender);
});
}
}
}
});
在控制器中保持等待图像加载的事件监听器:
$scope.$on('dataLoaded', function(ngRepeatFinishedEvent) {
// your code to check whether images has loaded
var promises = [];
var imageList = $('#my_tenants img');
for(var i = 0; i < imageList.length; i++) {
promises.push(imageList[i].on('load', function() {}););
}
$q.all(promises).then(function(){
// all images finished loading now
$scope.loading = false;
});
});
并在html方面:
<div id = "my_tenants">
<div ng-repeat="tenant in tenants" on-finish-render="dataLoaded">
// more divs
</div>
</div>