使用过滤器创建数组，然后使用该数组过滤 ng-options [英] Using filter to create array, then using that array to filter ng-options

问题描述

1. 我正在使用 isteven-multi-select 从一个选择元素的多个选择中输出一个对象数组.

   <预><代码>[{类别:冒险"，勾选:真实}，{ 类别:策略"，勾选:真实 }]

2.然后使用angular.forEach将对象数组更改为类别值数组.

$scope.testOutput = function () {angular.forEach($scope.output, function(value, prop, obj) {var categoryFiltered = [];categoryFiltered.push(value.category);console.log(categoryFiltered);});};categoryFiltered = ["冒险", "策略"];

3. 现在我需要使用 categoryFiltered 数组过滤掉 ng-repeat 中的其他类别.

HTML超li(ng-repeat='item in items | filter: {categories: categoryFiltered')

MongoDB 填充项目

<代码> {年份: 1962,类别:[冒险"]}, {年份: 1972,类别:[钓鱼"]}, {年份: 1982,类别:[策略"]}

实现这一目标的最佳方法是什么?

解决方案

编写自定义过滤器，然后您可以根据自己的喜好过滤类别(例如，您要过滤与所有指定类别匹配的项目吗?或者仅过滤某些类别?).

这是一个 plunkr 示例:http://plnkr.co/edit/Lv11QWumN7ktjfS15RpY?p=preview

它的主要部分，定义你的过滤器:

app.filter('filterByCategories', function() {返回函数(输入，类别){//input是要过滤的数组，categories是列表//要过滤的类别输入 = 输入 ||[];类别 = 类别 ||[];var 输出 = [];for (var i = 0; i < input.length; i++) {for (var j = 0; j 

然后您可以像这样使用自定义过滤器:

或者:

1. I am using isteven-multi-select to output an array of objects from a select element's multiple selections.

   [
     { category: "Adventure", ticked: true },
     { category: "Strategy", ticked: true }
   ]
   


2. Then using angular.forEach to change the array of objects into an array of the category values.

$scope.testOutput = function () {
    angular.forEach($scope.output, function(value, prop, obj) {
        var categoryFiltered = [];

        categoryFiltered.push(value.category);
        console.log(categoryFiltered);
    });
};

categoryFiltered = ["Adventure", "Strategy"];


3. Now I need to use the categoryFiltered array to filter out the other categories in an ng-repeat.

HTML

ul
  li(ng-repeat='item in items | filter: {categories: categoryFiltered')


MongoDB populating items

        {
          year: 1962,
          categories: ["Adventure"]
        }, {
          year: 1972,
          categories: ["Fishing"]
        }, {
          year: 1982,
          categories: ["Strategy"]
        }

What is the best way to achieve this?

解决方案

Write a custom filter, then you can filter the categories however you like (eg. do you want to filter items that match ALL the categories specified? Or only some?).

Here's a plunkr example: http://plnkr.co/edit/Lv11QWumN7ktjfS15RpY?p=preview

Main part of it, to define your filter:

app.filter('filterByCategories', function() {
    return function(input, categories) {
      // Input is the array to be filtered, categories is the list of
      // categories to filter by
      input = input || [];
      categories = categories || [];

      var output = [];
      for (var i = 0; i < input.length; i++) {
        for (var j = 0; j < categories.length; j++) {
          // If input matches any of the categories, then add it to the list
          if (input[i].categories.indexOf(categories[j].trim()) >= 0) {
            output.push(input[i]);
            break;
          }
        }
      }

      return output;
    };
  })

Then you can use the custom filter like so:

<li ng-repeat="item in data | filterByCategories: filterStr.split(',')">

Or:

<li ng-repeat="item in data | filterByCategories: ['Adventure', 'Strategy']">

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