如何使用带有 ng-animate 的 ng-repeat 对按顺序排序的列表进行动画处理? [英] How can I animate sorting a list with orderBy using ng-repeat with ng-animate?

问题描述

我正在使用 ng-repeat 和 orderBy 过滤器渲染一个对象列表，如下所示:

我尝试对列表排序的更改进行 ng-animate 的尝试已被证明令人沮丧，不值得分享.我在这里看过Yearofmoo示例应用.

不幸的是，这个演示并不是我想要实现的.在 orderBy 定义更改后，当将给定列表项放置在新订单中时，我需要为给定列表项的 X 位置设置动画.我试图通过 css 转换和绝对定位来实现这一点，但是 ng-repeat 似乎重新创建了 orderBy 上的列表项，这使得动画成为一个真正的挑战.

1. 这可以用 ng-repeat | 实现吗?orderBy(有或没有ng-animate)?
2. 您能建议一种方法或提供一个示例吗?

解决方案

所以，即使@Alex Osborn 已经在评论中展示了一种方法来做你想做的事情，这里是我的尝试:

angular.module('StackApp', []).controller('MainCtrl', function($scope) {'使用严格';$scope.reverse = '假';$scope.myList = [{编号:0，文本:'HTML5 样板'}, {编号:1，文字:'AngularJS'}, {编号:2，文字:'业力'}, {编号:3，文字:'你好'}, {编号:4，文字:'世界'}, {编号:5，文字:'如何'}, {编号:6，文字:'是'}, {编号:7，发短信给你'}, {编号:8，文本: '?'}, {编号:9，文字:'我'}, {编号:10，文字:'写'}, {编号:11，文字:'更多'}, {编号:12，文字:'到'}, {编号:13，文字:'制作'}, {编号:14，文字:'的'}, {编号:15，文本:'列表'}, {编号:16，文字:'更长'}];$scope.$watch('reverse', function() {$scope.setOrder();});$scope.setOrder = function() {如果($scope.reverse === '随机'){var t = [];for (var i = 0; i < $scope.myList.length; i++) {var r = Math.floor(Math.random() * $scope.myList.length);而 (inArray(t, r)) {r = Math.floor(Math.random() * $scope.myList.length);}t.push(r);$scope.myList[i].order = r;}} 别的 {for (var i = 0; i < $scope.myList.length; i++) {如果($scope.reverse === '假'){$scope.myList[i].order = i;} 别的 {$scope.myList[i].order = ($scope.myList.length - 1 - i);}}}};函数 inArray(a, value) {for (var i = 0; i < a.length; i++) {如果(a[i] === 值){返回真；}}返回假；}});

#list {/* 需要，否则项目将在页面顶部(见下文)*/位置:绝对；/* 全宽，否则看起来很奇怪 */宽度:100%；}#list li {位置:绝对；/* 顶部: 0;这将被 AngularJS 更改为每个列表项 */顶部:0；/* 物品高度;保持与模板文件同步 */高度:40px；/* 简单的过渡 */-webkit-transition:前 0.5 秒的缓入缓出；-moz-transition:前 0.5 秒缓入缓出；过渡:前 0.5 秒缓入缓出；}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script><div ng-app="StackApp"><div ng-controller="MainCtrl"><h1>动画顺序</h1><form action=""><label for="reverse">reverse = true</label><br><input type="radio" value="true" name="reverse" ng-model="reverse"><br><br><label for="reverse">reverse = false</label><br><input type="radio" value="false" name="reverse" ng-model="reverse"><br><br><label for="reverse">reverse = 随机(点击下方按钮再次随机播放)</label><br><input type="radio" value="random" name="reverse" ng-model="reverse"></表单><br><br><input type="button" ng-click="reverse = 'random';setOrder()" value="setOrder()"><br><br><ul id="list" ng-style="{height: ((myList.length * 40) + 'px')}"><li ng-repeat="item in myList" ng-style="{top: ((item.order * 40) + 'px')}">{{$index}} - {{item.order}}.{{item.text}}

因此，AngularJS 不会对项目进行排序，但它会更改 CSS 属性 top (ng-style="{top: ...}").AngularJS 不会重新创建列表，我们得到了一个很好的动画.:)

I'm rendering a list of objects using ng-repeat with an orderBy filter like this:

<li class="list-item" ng-repeat="item in items | orderBy:predicate:reverse">

My attempts to ng-animate a change in sorting of the list have proven frustrating and aren't worth sharing. I have seen the Yearofmoo example app here.

Unfortunately this demonstration is not quite what I'm trying to achieve. I need to animate the X position of a given list item when it is placed in a new order after the orderBy definition changes. I have tried to accomplish this with css transitions and absolute positioning, but ng-repeat seems to recreate the list items on orderBy making animation a real challenge.

1. Is this possible with ng-repeat | orderBy (with or without ng-animate)?
2. Can you suggest an approach or provide an example?

解决方案

So, even if @Alex Osborn has shown a way to do what you want in the comments, here is my attempt:

angular.module('StackApp', []).controller('MainCtrl', function($scope) {
  'use strict';

  $scope.reverse = 'false';

  $scope.myList = [{
    id: 0,
    text: 'HTML5 Boilerplate'
  }, {
    id: 1,
    text: 'AngularJS'
  }, {
    id: 2,
    text: 'Karma'
  }, {
    id: 3,
    text: 'Hello'
  }, {
    id: 4,
    text: 'World'
  }, {
    id: 5,
    text: 'How'
  }, {
    id: 6,
    text: 'Are'
  }, {
    id: 7,
    text: 'You'
  }, {
    id: 8,
    text: '?'
  }, {
    id: 9,
    text: 'I'
  }, {
    id: 10,
    text: 'write'
  }, {
    id: 11,
    text: 'more'
  }, {
    id: 12,
    text: 'to'
  }, {
    id: 13,
    text: 'make'
  }, {
    id: 14,
    text: 'the'
  }, {
    id: 15,
    text: 'list'
  }, {
    id: 16,
    text: 'longer'
  }];

  $scope.$watch('reverse', function() {
    $scope.setOrder();
  });

  $scope.setOrder = function() {

    if ($scope.reverse === 'random') {

      var t = [];

      for (var i = 0; i < $scope.myList.length; i++) {
        var r = Math.floor(Math.random() * $scope.myList.length);
        while (inArray(t, r)) {
          r = Math.floor(Math.random() * $scope.myList.length);
        }
        t.push(r);
        $scope.myList[i].order = r;
      }

    } else {

      for (var i = 0; i < $scope.myList.length; i++) {
        if ($scope.reverse === 'false') {
          $scope.myList[i].order = i;
        } else {
          $scope.myList[i].order = ($scope.myList.length - 1 - i);
        }
      }
    }
  };

  function inArray(a, value) {
    for (var i = 0; i < a.length; i++) {
      if (a[i] === value) {
        return true;
      }
    }
    return false;
  }

});

#list {
  /* Needed, otherwise items would be at top of the page (see below) */
  position: absolute;
  /* full width, or it would look strange */
  width: 100%;
}
#list li {
  position: absolute;
  /* Top: 0; this will be changed for every single list item by AngularJS */
  top: 0;
  /* Item height; hold this in sync with template file */
  height: 40px;
  /*  Simple transition */
  -webkit-transition: top 0.5s ease-in-out;
  -moz-transition: top 0.5s ease-in-out;
  transition: top 0.5s ease-in-out;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
<div ng-app="StackApp">
  <div ng-controller="MainCtrl">
    <h1>Animate Order</h1>
    <form action="">
      <label for="reverse">reverse = true</label>
      <br>
      <input type="radio" value="true" name="reverse" ng-model="reverse">
      <br>
      <br>
      <label for="reverse">reverse = false</label>
      <br>
      <input type="radio" value="false" name="reverse" ng-model="reverse">
      <br>
      <br>
      <label for="reverse">reverse = random (click button below to shuffle again)</label>
      <br>
      <input type="radio" value="random" name="reverse" ng-model="reverse">
    </form>
    <br>
    <br>
    <input type="button" ng-click="reverse = 'random';setOrder()" value="setOrder()">
    <br>
    <br>
    <ul id="list" ng-style="{height: ((myList.length * 40) + 'px')}">
      <li ng-repeat="item in myList" ng-style="{top: ((item.order * 40) + 'px')}">{{$index}} - {{item.order}}. {{item.text}}</li>
    </ul>
  </div>
</div>

So, AngularJS doesn't order the items, but it changes the CSS attribute top (ng-style="{top: ...}"). AngularJS doesn't recreate the list and we get a nice animation. :)

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