[英]AngularJS application: unable to update $index
我正在使用Giphy.com api在AngularJS 1.6中开发应用程序。
有一个Plunker 这里 。
我迭代了来自https://api.giphy.com/v1/gifs/trending?api_key=myApyKey
的一系列“giphys”,并将它们显示在Bootstrap 4卡中。
有一个视图单giphy功能 。 在控制器中我有:
// Create controller for the "giphyApp" module
app.controller("giphyCtrl", ["$scope", "$http", "$filter", "$timeout", function($scope, $http, $filter, $timeout) {
var url = "https://api.giphy.com/v1/gifs/trending?api_key=PTZrBlrq8h2KUsRMeBuExZ5nHyn7dzS0&limit=120&rating=G";
$scope.giphyList = [];
$scope.search = "";
$scope.filterList = function() {
var oldList = $scope.giphyList || [];
$scope.giphyList = $filter('filter')($scope.giphys, $scope.search);
if (oldList.length != 0) {
$scope.pageNum = 1;
$scope.startAt = 0;
};
$scope.itemsCount = $scope.giphyList.length;
$scope.pageMax = Math.ceil($scope.itemsCount / $scope.perPage);
};
$http.get(url)
.then(function(data) {
// giphy arary
$scope.giphys = data.data.data;
$scope.filterList();
console.log($scope.giphys);
// Paginate
$scope.pageNum = 1;
$scope.perPage = 24;
$scope.startAt = 0;
$scope.filterList();
$scope.currentPage = function(index) {
$("html, body").animate({
scrollTop: 0
}, 500);
$timeout( function(){
$scope.pageNum = index + 1;
$scope.startAt = index * $scope.perPage;
},0);
};
$scope.prevPage = function() {
if ($scope.pageNum > 1) {
$scope.pageNum = $scope.pageNum - 1;
$scope.startAt = ($scope.pageNum - 1) * $scope.perPage;
}
};
$scope.nextPage = function() {
if ($scope.pageNum < $scope.pageMax) {
$scope.pageNum = $scope.pageNum + 1;
$scope.startAt = ($scope.pageNum - 1) * $scope.perPage;
}
};
$scope.selectedIndex = null;
$scope.selectedGiphy = null;
$scope.fetchSinglegGiphy = function(giphy, index) {
console.log(index);
$scope.selectedIndex = index;
$scope.selectedGiphy = giphy;
}
});
}]);
网格
<div class="row grid" ng-if="giphyList.length > 0">
<div data-ng-repeat="giphy in giphyList | limitTo : perPage : startAt"
class="col-xs-12 col-sm-6 col-lg-4 col-xl-3 d-flex mb-4">
<div class="giphy d-flex flex-column w-100">
<div class="thumbnail pb-2 text-center" data-toggle="modal"
data-target="#giphyModal"
ng-click="fetchSinglegGiphy(giphy, $index)">
<img ng-src="{{giphy.images.downsized.url}}" class="img-fluid">
</div>
<div class="text mt-auto">
<p class="m-0 meta">{{giphy.import_datetime | dateParse | date : "MMMM dd y" }}</p>
<p class="rating m-0">
<i class="fa fa-star" aria-hidden="true"></i> {{giphy.rating | capitalize}}
</p>
<ul class="list-unstyled mb-0 text-center">
<li ng-if="giphy.username != ''" class="text-muted">{{giphy.type | capitalize}} file uploaded by
<br><strong>{{giphy.username | capitalize }}</strong>
</li>
<li ng-if="giphy.username == ''" class="text-muted">{{giphy.type | capitalize}} file uploaded by
<br> <strong>Unknown</strong>
</li>
<li class="h6">{{giphy.title | titlecase }}</li>
</ul>
</div>
</div>
</div>
</div>
<div class="modal fade" id="giphyModal">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h4 class="modal-title h-3">{{selectedGiphy.title | titlecase }}</h4>
<button type="button" class="close" data-dismiss="modal">
<span>×</span>
</button>
</div>
<div class="modal-body">
<div class="row">
<div class="col-12">
<div class="image image text-center">
<img ng-src="{{selectedGiphy.images.original.url}}"
alt="{{selectedGiphy.title }}" class="img-fluid">
</div>
</div>
</div>
</div>
<div class="modal-footer justify-content-between">
<div class="text-muted">Image ID: {{selectedGiphy.id}}</div>
<div class="btn-group btn-group-sm">
<button type="button" class="btn btn-success" data-dismiss="modal">
<i class="fa fa-times-circle"></i> Close
</button>
</div>
</div>
</div>
</div>
</div>
这部分应用程序运行正常。
我本来希望能够轻松地将下一个和之前的giphy添加到上面的模式中:
<div class="controls text-center">
<a href="#" ng-click="fetchSinglegGiphy(giphy, $index = $index - 1)" class="left">
<i class="fa fa-chevron-left"></i>
</a>
<a href="#" ng-click="fetchSinglegGiphy(giphy, $index = $index + 1)" class="right">
<i class="fa fa-chevron-right"></i>
</a>
</div>
令我惊讶的是,这不起作用。 当我单击任何一个控件时,GIF文件保持不变,并且模式中的所有文本都会消失。
问题:
当我单击任何一个控件时,GIF文件保持不变
检查giphy
等于你的期望:
$scope.fetchSinglegGiphy = function(giphy, index) {
$scope.selectedIndex = index;
$scope.selectedGiphy = giphy;
if ( giphy != $scope.giphyList[index] ) {
$scope.selectedGiphy = $scope.giphyList[index];
};
};
更新selectedGiphy
,如果不是。
你不仅可以在ng-repeat块之外使用$ index,而且还可以在该块之外使用giphy,而不是定义它。
我假设您在控制器中定义了$ scope.giphyList。 所以你要做的就是发送索引。
$scope.selectedIndex = null;
$scope.selectedGiphy = null;
$scope.fetchSinglegGiphy = function(index) {
$scope.selectedIndex = index;
$scope.selectedGiphy = $scope.giphyList[index];
}
<div class="controls text-center">
<a href="#" ng-click="fetchSinglegGiphy(selectedIndex-1)" class="left">
<i class="fa fa-chevron-left"></i>
</a>
<a href="#" ng-click="fetchSinglegGiphy(selectedIndex+1)" class="right">
<i class="fa fa-chevron-right"></i>
</a>
</div>
干杯,我希望这会有所帮助
的index.html
<div class="modal fade" id="giphyModal">
<div class="modal-dialog">
<div class="modal-content">
<div class="controls text-center">
<a href="#" ng-click="fetchSinglegGiphyModal('prev')" class="left"><i class="fa fa-chevron-left"></i></a>
<a href="#" ng-click="fetchSinglegGiphyModal('next')" class="right"><i class="fa fa-chevron-right"></i></a>
</div>
<div class="modal-header">
<h4 class="modal-title h-3">
{{ selectedGiphy.title | capitalize }}
</h4>
<button type="button" class="close" data-dismiss="modal">
<span>×</span>
</button>
</div>
<div class="modal-body">
<div class="row">
<div class="col-12">
<div class="image image text-center">
<img ng-src="{{ selectedGiphy.images.original.url }}" alt="{{ selectedGiphy.title }}" class="img-fluid" image-on-load ng-hide="modalImageLoading" />
<div class="spinner-border" ng-if="modalImageLoading"></div>
</div>
</div>
</div>
</div>
<div class="modal-footer justify-content-between">
<div class="text-muted">
Image ID: {{ selectedGiphy.id }}
</div>
<div class="btn-group btn-group-sm">
<button type="button" class="btn btn-success" data-dismiss="modal">
<i class="fa fa-times-circle"></i> Close
</button>
</div>
</div>
</div>
</div>
</div>
改进:
<a href="#" ng-click="fetchSinglegGiphyModal('prev')" class="left"><i class="fa fa-chevron-left"></i></a>
<a href="#" ng-click="fetchSinglegGiphyModal('next')" class="right"><i class="fa fa-chevron-right"></i></a>
fetchSinglegGiphyModal
根据作用于我们在函数中传递的参数prev
或next
值的条件处理前一个和下一个Giphy 。
我还添加了以下代码来介绍带有引导程序的加载程序,以指示GIF图像正在后台加载。
<div class="image image text-center">
<img ng-src="{{ selectedGiphy.images.original.url }}" alt="{{ selectedGiphy.title }}" class="img-fluid" image-on-load ng-hide="modalImageLoading" />
<div class="spinner-border" ng-if="modalImageLoading"></div>
</div>
app.js
$scope.modalImageLoading = false;
$scope.fetchSinglegGiphy = function (giphy, index) {
$scope.selectedIndex = index;
$scope.selectedGiphy = giphy;
$scope.modalImageLoading = true;
};
$scope.fetchSinglegGiphyModal = function (dir) {
let selectedGiphy = null;
if (dir === "prev") $scope.selectedIndex -= 1; // To load previous
else if (dir === "next") $scope.selectedIndex += 1; // To load next
selectedGiphy = $scope.giphyList[$scope.selectedIndex];
if (selectedGiphy) {
$scope.selectedGiphy = selectedGiphy;
$scope.modalImageLoading = true;
}
};
$scope.fetchSinglegGiphyModal
作用于我们在参数中传递的条件并显示相应的Giphy数据。
我已经实现了一个自定义指令来显示图像元素并在下载图像时隐藏加载器。 这是指令代码:
app.directive('imageOnLoad', function () {
return {
restrict: 'A',
controller: 'giphyCtrl',
link: function (scope, element, attrs) {
element.bind('load', function () {
scope.$apply(function () {
scope.modalImageLoading = false;
});
});
}
}
});
这是修改后的plunker 代码 。
希望能帮助到你!
如果你将giphy移动到模态,你也应该发送$ index(就像你真的那样),所以在模态中你知道你的索引是谁,而不管$ index。
<div class="controls text-center">
<a href="#" ng-click="fetchSinglegGiphy(giphy, selectedIndex - 1)" class="left"><i class="fa fa-chevron-left"></i></a>
<a href="#" ng-click="fetchSinglegGiphy(giphy, selectedIndex + 1)" class="right"><i class="fa fa-chevron-right"></i></a>
</div>
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