javascript - CSS 过渡仅在第一次应用时有效

Question

作为我正在创建的 AngularJS 应用程序的一部分，我有一个记录列表，分为 3 个部分: 当前选定记录之前的记录列表、当前选定记录以及当前选定记录之后的记录列表。记录列表和当前选定的记录都是从所有记录的单个父列表创建的(记录在所有记录列表中的顺序不会改变)。所以基本的 HTML 结构如下所示:

<div class="card list" ng-repeat="timeRecord in recordsBeforeCurrent">
    ....
</div>
<div class="card" ng-class="active" id="currentRecordCard">
    ....
    <h2 ng-class="activeTimer" id="currentRecordTimer"></h2>
    ....
</div>
<div class="card list" ng-repeat="timeRecord in recordsAfterCurrent">
    ....
</div>

每当当前选择的记录发生变化时，我希望能够将 css 转换应用到 currentRecordCard 元素和 currentRecordTimer 元素。我使用以下 css 执行此操作:

#currentRecordCard {
    margin-top: 20px;
    margin-bottom: 20px;
    transition: margin 1s ease;
}

#currentRecordCard.active {
    margin-top: 40px;
    margin-bottom: 40px;
}

#currentRecordTimer {
    font-size: 20px;
    position: absolute;
    left: 0;
    margin-left: 16px;
    transition: all 0.5s ease;
}

#currentRecordTimer.activeTimer {
    font-size: 30px;
    left: 50%;
    margin-left: -57px;
}

每次用户单击 recordsBeforeCurrent 或 recordsAfterCurrent 列表中的记录时，都会调用函数 resumeRecord()目前看起来像这样:

$scope.resumeRecord = function(record){
    $scope.active = "";
    $scope.activeTimer = "";


    *** 
        currentRecord = null;
        lists of before and after records are cleared;
        currentRecord is set whichever record was just clicked;
        lists of before and after records are recalculated;
    ***

    $scope.active = "active";
    $scope.activeTimer = "activeTimer";
}

目前，第一次更改 currentRecord 时，转换工作正常，但之后每次更改 currentRecord 时，都没有转换，并且 .active 和 .activeTimer 类属性始终处于事件状态，所以我不太确定问题出在哪里......

干杯

Answer 1

这样做。在 Plunkr 中测试.

<div class="card list"
     ng-class="currentRecord === $index ? 'active' : ''"
     ng-click="toggleRecord($index)"
     ng-repeat="timeRecord in records">
     <h2></h2>
</div>

JavaScript

$scope.toggleRecord = function($index) {
    $scope.currentRecord = $index;
}

CSS

.card {
    margin-top: 20px;
    margin-bottom: 20px;
    transition: margin 1s ease;
}

.card.active {
    margin-top: 40px;
    margin-bottom: 40px;
}

.card h2 {
    font-size: 20px;
    position: absolute;
    left: 0;
    margin-left: 16px;
    transition: all 0.5s ease;
}

.card.active h2 {
    font-size: 30px;
    left: 50%;
    margin-left: -57px;
}