如何在 ng-repeat 中获取上一项? [英] How to obtain previous item in ng-repeat?

问题描述

我有一个模板，仅当当前项目与前一个项目有一些不同的字段时，我才想在其中生成一些 HTML.如何在 ng-repeat 中访问上一项?

解决方案

你可以这样做

<ul id="内容"><li ng-repeat="内容中的内容"><div class="title">{{$index}} - {{content.title}} - {{contents[$index - 1]}}</div>

JS

var app = angular.module('test-app', []);app.controller('MyController', function($scope){$scope.contents=[{标题:'第一'}, {书名:《第二》}, {书名:《第三》}]})

演示:小提琴

<小时>

注意: $index 用于指令数组，它可能与作用域数组不同.使用内联变量访问正确的数组.

{{correctContents[$index - 1] }} 是 prev 元素

如果您过滤或排序，contents[$index] != content.

I have a template in which I want to generate some HTML only if the current item has some different fields from the previous item. How can I access the previous item in an ng-repeat?

解决方案

You can do something like

<div ng-app="test-app" ng-controller="MyController">
    <ul id="contents">
      <li ng-repeat="content in contents">
          <div class="title">{{$index}} - {{content.title}} - {{contents[$index - 1]}}</div>
      </li>
    </ul>
</div>

JS

var app = angular.module('test-app', []);

app.controller('MyController', function($scope){
    $scope.contents=[{
        title: 'First'
    }, {
        title: 'Second'
    }, {
        title: 'Third'
    }]
})

Demo: Fiddle

---

Be careful: $index is for the directive array, which may be different than the scope array. Use an inline variable to access the correct array.

<li ng-repeat="content in (correctContents = (contents | orderBy:'id'))">
  {{ correctContents[$index - 1] }} is the prev element
</li>

If you filter or orderBy, contents[$index] != content.

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