【发布时间】：2019-11-27 08:11:18
【问题描述】：
我正在使用 Giphy.com api 在 AngularJS 1.6 中开发一个应用程序。
有一个Plunker HERE。
我遍历来自https://api.giphy.com/v1/gifs/trending?api_key=myApyKey 的“giphys”数组并将它们显示到 Bootstrap 4 卡片中。
有一个查看单个 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>
模态
<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>
应用程序的这部分工作正常。
我曾期望能够轻松地将 下一个和上一个 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，但模式中的所有文本都消失了。
问题：
- 这种方法有什么问题？
- 您认为可行的替代方案吗？
【问题讨论】：
-
你可以尝试用 $index - 1 代替 $index = $index - 1 吗？
-
@Giovanni 我做到了。结果是一样的。
-
$index 是由 ng-repeat 创建/管理的，你不应该尝试编辑它。
-
也许您可以将索引保存在本地存储或其他东西中？
-
您的第二个代码块是否在
ng-repeat之外？你不能在它之外使用$index。
标签： javascript angularjs bootstrap-4