Angular JS ng-repeat从数组中选择随机分组？ [英] Angular JS ng-repeat choose random grouping from array?

问题描述

我有6个对象的数组。

I have an array of 6 objects.

我有一个带有ng-repeat的列表，我想在这6个项目中显示3个唯一的项目。

I have a list with an ng-repeat where I want to display 3 unique items from those 6 items.

每次刷新一次，它可能会拉3个不同的项目，但是如果没有，就可以了，唯一的是这3个项目之间不能有重复项。

One each refresh, it might pull 3 different items, but it's ok if it does not, the only thing is that the 3 cannot have duplicates amongst themselves.

例如，如果数组为 [红色，黄色，蓝色，绿色，紫色，青色，紫红色] ，则在刷新后我可以得到：

As an example, if the array is [red, yellow, blue, green, purple, cyan, fuchsia] then on refresh I could get:

red,blue,green
purple,blue,yellow
fuchsia,green,red

等。如您所见，我不在乎那个蓝色连续出现两次，但是我绝对不能得到红色，蓝色，蓝色。

etc. As you can see, I don't care that blue came up twice in a row there, but I must never get red, blue, blue.

我有以下代码：

<ul class="ch-grid">
  <li ng-repeat="user in home.testimonials|orderBy:random|limitTo: 3">
    <div class="ch-item ch-img-1" style="background-image: url(assets/images/{{user.image}})">
      <div class="ch-info">
        <h3>{{user.quote}}</h3>
      </div>
    </div>
    <h3 class="name">{{user.name}}</h3>
    <p class="title">{{user.title}}</p>
  </li>
</ul>

，它们在我的控制器中：

and them in my controller:

_this.random = function () {
  return 0.5 - Math.random();
};

_this.testimonials = [
  {
    name: 'Sara Conklin',
    title: 'SMB/SendPro UX Architect',
    image: 'sara-conklin.jpg',
    quote: 'Instead of inventing original solutions, we can leverage DS guidelines and components, save time, ensure great UX and promote consistency. '},
  {
    name: 'Jenn Church',
    title: 'User Experience Designer',
    image: 'jenn-church.jpg',
    quote: 'The Design System has been a great tool in rapid prototyping, allowing me to get modern, on-brand interfaces put together quickly without having to start from scratch.'},
  {
    name: 'Peter Leeds',
    title: 'Global Creative and Brand Activation',
    image: 'peter-leeds.jpg',
    quote: 'Design System provides the unified, consistent look needed to preserve and reinforce the integrity of our brand."'},
  {
    name: 'Marcy Goode',
    title: 'Digital Marketing, Self Service & Content Management Leader',
    image: 'marcy-goode.jpg',
    quote: 'Lorem ipsum dolor sit amet, consectetur adipisicing elit. Iusto, ipsam, mollitia in vitae nemo aliquam.'},
  {
    name: 'Clarence Hempfield',
    title: 'Spectrum Spatial Analyst Product Manager',
    image: 'clarence.jpg',
    quote: 'Design System isn’t just about the interface. It’s about understanding how people are expecting to interact with your technology.'},
  {
    name: 'Aaron Videtto',
    title: 'SendSuite Tracking Online Product Manager',
    image: 'aaron.jpg',
    quote: 'Customers of SendSuite Tracking Online have been up and running within 10-15 minutes. We were able to do this because of the Design System.'}
];

但不限于3，我得到几十个。

But it is not limiting to 3, I get dozens.

好，尝试使用@csschapker建议的过滤路径：

OK, trying the filter route as suggested by @csschapker:

    (function () {
  'use strict';

  angular.module('pb.ds.home').filter('getThree', function () {
    return function (array) {
      var copy = angular.copy(array);
      var sample = [];
      while (sample.length < 3) {
        var randomIndex = Math.floor(Math.random() * (copy.length));
        sample.push(copy[randomIndex]);
      }
      return sample;
    };
  });
})();

和

    <ul class="ch-grid">
  <li ng-repeat="user in home.testimonials|filter:getThree">
    <div class="ch-item ch-img-1" style="background-image: url(assets/images/{{user.image}})">
      <div class="ch-info">
        <h3>{{user.quote}}</h3>
      </div>
    </div>
    <h3 class="name">{{user.name}}</h3>
    <p class="title">{{user.title}}</p>
  </li>
</ul>

这只是打印出所有6条。我一定错过了一些东西。

This simply prints out all 6. I must be missing something.

推荐答案

用户随机数和limitTo过滤器。

User random and limitTo filters.

<p ng-repeat="i in list|orderBy:random|limitTo:3">{{i}}</p>

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