Angular 自定义过滤器：将值与数组中的值匹配并得到对应的名称

Question

Blockquote

我想使用 Angular 过滤器将数字转换为动物。

我有以下 ng-repeat:

<div ng-repeat="speed in speeds track by $index">
   You're faster than a <span ng-bind="speed.value | speedToAnimal"></span>
</div>

speed.value 会给你一个像 42.9

这样的值

我想将此速度值与速度与动物相关联的数组中的速度值相匹配。

例如这是我的数组：

var animals = [
    {
      "speed": 33.7,
      "animal": 'pig',
    },
    {
      "speed": 40.2,
      "animal": 'Dog',
    },
    {
      "speed": 45.4,
      "animal": 'Horse',
    }
    ...
];

速度值42.9高于数组中狗的速度值但低于马的速度值所以我希望过滤器将值42.9变成"Dog"所以结束结果将是：你比狗快，而不是你比 42.9

我知道如何调用过滤器，但不知道如何构建过滤器。
通话过滤器：ng-bind="speed.value | speedToAnimal
过滤器：

app.filter('speedToAnimal', function() {
  return function(input, optional1, optional2) {
    // Do filter work here
    return output;
  }
});

jsfiddle

Answer 1

亲爱的,

这是您的代码的工作 Fiddle：Fiddle of Your Code

现在，这也是您的代码：

HTML 部分：

<div ng-controller="MyCtrl">
 <legend> Enter Speed</legend> 
<input type="text" ng-model="speed.value" required />
<button type="button" ng-click="calc()">Get Animal</button>

<span>{{filteredAnimals}}</span>
</div>

控制器代码

var myApp = angular.module('myApp',[]);

myApp.controller('MyCtrl', function($scope) {
    $scope.animals = [
    {
      "speed": 33.7,
      "animal": 'pig',
    },
    {
      "speed": 40.2,
      "animal": 'Dog',
    },
    {
      "speed": 45.4,
      "animal": 'Horse',
    }];

    $scope.calc = function(){
        $scope.curSpeed = $scope.speed.value;
        var len = $scope.animals.length - 1;
        var filteredAnimals;
        while(len >= 0){
            if($scope.curSpeed >= $scope.animals[len].speed){
                filteredAnimals = $scope.filteredAnimals = $scope.animals[len].animal;
                break;
            }
            len--;
        }
    }
});

谢谢和干杯

Answer 2

在 Amulya Kashyap 的回答的帮助下，这是我的工作解决方案：

<div ng-repeat="speed in speeds track by $index">
   You're faster than a <span ng-bind="speed.value | speedToAnimal"></span>
</div>

过滤器 a 提出：

app.filter('speedToAnimal', function () {
    return function (value) {

        var animals = [
            {"speed":12,"animal":"Field Mouse"},
            {"speed":13,"animal":"House Mouse"},
            {"speed":16,"animal":"Camel"},
            {"speed":18,"animal":"Pig"},
            {"speed":20,"animal":"Gray Squirrel"},
            {"speed":22,"animal":"Sea Lion"},
            {"speed":24,"animal":"Sheep"},
        ];

        if(!animals) return;

        var curSpeed = value;
        var len = animals.length - 1;
        while(len >= 0){
            if(curSpeed >= animals[len].speed){
                return animals[len].animal;
            }
            len--;
        }
    };
});

Angular 自定义过滤器：将值与数组中的值匹配并得到对应的名称

Angular Custom filters: match value with value in array and get corresponding name

arrays

angularjs

ionic-framework

angular-filters