angularjs filter详解

系统的学习了一下angularjs，发现angularjs的有些思想根php的模块smarty很像，例如数据绑定，filter。如果对 smarty比较熟悉的话，学习angularjs会比较容易一点。这篇简单说一下angularjs的filter功能，angularjs的 filter功能可分为二种，一种是内置的过滤器，一种是自定义的。

一，内置的过滤器

1，uppercase，lowercase大小转换

{{ "lower cap string" | uppercase }}     //结果：LOWER CAP STRING
{{ "TANK is GOOD" | lowercase }}         //结果：tank is good

 ｜这里的竖线是一种管道功能，如果对linux比较熟悉的话，这块的｜根linux的管道功能，基本是一样的2，json格式化

{{ {foo: "bar", baz: 23} | json }}    //结果：{ "foo": "bar", "baz": 23 }

注意：bza没格式前是没有双引号的，格式化后就转换成了json数据了。

3，date格式化

mysql时间戳 ng-bind="message.time * 1000 | date:'yyyy-mm-dd'"
{{ 1304375948024 | date:'medium'}}      //May 03, 2011 06:39:08 PM
{{ 1304375948024 | date }}                          //结果：May 3, 2011
{{ 1304375948024 | date:"MM/dd/yyyy @ h:mma" }}     //结果：05/03/2011 @ 6:39AM
{{ 1304375948024 | date:"yyyy-MM-dd hh:mm:ss" }}    //结果：2011-05-03 06:39:08

 4，number格式化

{{ 1.234567 | number:1 }}    //结果：1.2  
{{ 1234567 | number }}       //结果：1,234,567 

 5，currency货币格式化

{{ 250 | currency }}                 //结果：$250.00  
{{ 250 | currency:"RMB ￥ " }}       //结果：RMB ￥ 250.00  

 6，filter查找 只能查value,不能查key

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | filter:'s'}}    //查找含有有s的行

//上例结果：[{"age":12,"id":11,"name":"sunm xing"},{"age":44,"id":12,"name":"test abc"}]

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | filter:{'name':'ip'} }}   //查找name like ip的行
//上例结果:[{"age":20,"id":10,"name":"iphone"}]

$filter('number')(30000, 2);
var jsonString = $filter('json')({"age":12,"id":11,"name":"sunm xing"},{"age":44,"id":12,"name":"test abc"}])

 7，limitTo字符串，对像的截取

{{ "i love tank" | limitTo:6 }}           //结果：i love
{{ "i love tank" | limitTo:-4 }}          //结果：tank

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | limitTo:1 }}     //结果：[{"age":20,"id":10,"name":"iphone"}]

 8，orderBy对像排序

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | orderBy:'id':true }}        //根id降序排

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | orderBy:'id' }}           //根据id升序排

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | orderBy:['-age','name'] }}

二，自定filter功能

filter的自定义方式也很简单，使用module的filter方法，返回一个函数，该函数接收输入值，并返回处理后的结果。

app.filter('过滤器名称',function(){
    return function(需要过滤的对象,过滤器参数1,过滤器参数2,...){
        //...做一些事情  
        return 处理后的对象;
    }
}); 

我找了一个基本angularjs的mvc框架，phonecat，自定义filter也是在这基础写的，这个框架挺好用的。

filters.js添加一个module

angular.module('tanktest', []).filter('tankreplace', function() {
    return function(input) {
        return input.replace(/tank/, "=====")
    };
});

html中调用

{{ "TANK is GOOD" | lowercase |tankreplace}}   //结果：===== is good

 注意：| lowercase |tankreplace管道命令可以有多个

 

yourApp.filter('orderObjectBy', function() {
  return function(items, field, reverse) {
    var filtered = [];
    angular.forEach(items, function(item) {
      filtered.push(item);
    });
    filtered.sort(function (a, b) {
      return (a[field] > b[field] ? 1 : -1);
    });
    if(reverse) filtered.reverse();
    return filtered;
  };
});

该过滤器将对象转换成标准的数组并把它通过您指定字段排序。您可以使用orderObjectBy过滤器酷似ORDERBY，包括字段名后一个布尔值，以指定的顺序是否应该得到扭转。换句话说，假的是升序，真正的下降。html调用

<li ng-repeat="item in items | orderObjectBy:'color':true">{{ item.color }}</li>

 

排序搜索

<input type="text" ng-model="search" class="form-control" placeholder="Search">
<thead>
    <tr>
        <!--  ng-class="{dropup:true}" -->
        <th ng-click="changeOrder('id')" ng-class="{dropup: order === ''}">
            产品编号
            <span ng-class="{orderColor: orderType === 'id'}" class="caret"></span>
        </th>
        <th ng-click="changeOrder('name')" ng-class="{dropup: order === ''}">
            产品名称
            <span ng-class="{orderColor: orderType === 'name'}" class="caret"></span>
        </th>
        <th ng-click="changeOrder('price')" ng-class="{dropup: order === ''}">
            产品价格
            <span ng-class="{orderColor: orderType === 'price'}" class="caret"></span>
        </th>
    </tr>
</thead>
<tbody>
    <tr ng-repeat="item in productData | filter: search | orderBy:order + orderType">
        <td>{{item.id}}</td>
        <td>{{item.name}}</td>
        <td>{{item.price | currency: '￥'}}</td>
    </tr>
</tbody>

 angularjs

//默认排序字段
$scope.orderType = 'id';

$scope.order = '-';

$scope.changeOrder = function(type) {
    console.log(type);
    $scope.orderType = type;

    if ($scope.order === '') {
        $scope.order = '-';
    }else{
        $scope.order = '';
    }
}