AngularJS:计数过滤项目 [英] AngularJS: Count Filtered Items
问题描述
我显示列表的子集,如果一个复选框被选中。我想换成旁边的复选框以选择条件匹配的列表中的计数的X.我有一个plunker,做的一切,但算子 rel=\"nofollow\">。
我的控制器看起来是这样的:
VAR应用= angular.module('应用',[]);app.controller('MainController',函数($范围){
$ scope.cbMarvel =真;
$ scope.cbDCComics = TRUE; $ scope.heroes = [
{
ID:1,
名称:钢铁侠,
FNAME:'托尼',
LNAME:斯塔克,
位置:斯塔克大厦,
漫画:奇迹
},
{
ID:2,
名称:'蝙蝠侠',
FNAME:'布鲁斯,
LNAME:'韦恩',
位置:蝙蝠洞,
漫画:DC
},
{
ID:3,
名称:'超人',
FNAME:'克拉克',
LNAME:肯特,
位置:Metroplis',
漫画:DC
},
{
ID:1,
名称:夜魔侠,
FNAME:'杰克',
LNAME:'默多克',
位置:法院室,
漫画:奇迹
},
{
ID:5,
名称:'闪光',
FNAME:巴里,
LNAME:艾伦,
位置:Speedline公司',
漫画:DC
},
{
编号:6,
名称:'绿巨人',
FNAME:'布鲁斯,
LNAME:'旗帜',
位置:Labratory',
漫画:奇迹
},
{
ID:7,
名称:'鹰眼',
FNAME:克林特',
LNAME:巴顿,
位置:'鸟巢',
漫画:奇迹
},
{
ID:8,
名称:'雷神',
FNAME:唐纳德,
LNAME:布雷克,
位置:仙宫,
漫画:奇迹
}
];
});
和我的看法是这样的:
<!DOCTYPE HTML>
< HTML NG-应用=应用程序>
< HEAD>
<链路数据需要=引导@ *数据semver =3.2.0的rel =stylesheet属性HREF =https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.css />
<链路数据需要=引导,CSS @ *数据semver =3.2.0的rel =stylesheet属性HREF =// maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min的.css/>
&所述;脚本数据需要=自举@ *数据semver =3.2.0SRC =https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.js>&下; / SCRIPT>
&所述;脚本数据需要=jquery@2.0.3电流数据semver =2.0.3SRC =HTTP://$c$c.jquery.com/jquery-2.0.3.min.js >< / SCRIPT>
&所述;脚本数据需要=angular.js@1.2.20数据semver =1.2.20SRC =的https://$c$c.angularjs.org/1.2.20/angular.js&GT ;< / SCRIPT>
&所述;脚本数据需要=角的ui-引导@ *数据semver =0.11.0SRC =http://angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.11。 0.min.js>< / SCRIPT>
<链接rel =stylesheet属性HREF =style.css文件/>
&所述; SCRIPT SRC =的script.js>&下; /脚本>
< /头> <机身NG控制器=MainController>
<&字段集GT;
<传奇>评论日志< /传说>
< DIV CLASS =行>
< DIV CLASS =COL-MD-4>
<输入类型=复选框NG模型=cbMarvel/>奇迹[X]
< / DIV>
< DIV CLASS =COL-MD-4>&安培; NBSP;< / DIV>
< DIV CLASS =COL-MD-4>
<输入类型=复选框NG模型=cbDCComics/> DC漫画[X]
< / DIV>
< / DIV> < DIV CLASS =行>&安培; NBSP;< / DIV> < DIV CLASS =行COL-MD-10>
< DIV NG-IF =heroes.length == 0>< B>没有英雄找到<!/ B>
< / DIV>
< DIV NG重复=英雄中的H |过滤器:{漫画:'奇迹'}NG秀=cbMarvel>
{{h.name}} - {{h.comic}}
< / DIV>
< DIV NG重复=英雄中的H |过滤器:{漫画:DC}NG秀=cbDCComics>
{{h.name}} - {{h.comic}}
< / DIV>
< / DIV>
< /字段集>
< /身体GT;< / HTML>
您可以设置在视图模型本身的数量,同时结合数据,或者只是在返回的计数范围的方法。
app.controller('MainController',函数($范围,filterFilter){
....
$ scope.getCount =函数(strcat的){
返回filterFilter($ scope.heroes,{漫画:strcat的})长;
}
...
});
和使用它作为: -
奇迹[{{getCount将(奇迹)}}]
.....
DC漫画[{{getCount将(DC)}}]
如果该列表是不变化的,当你的页面,我建议找出长度并将其绑定到视图模型本身的属性,并在视图中使用它。
//设置你的数据模型
$ scope.cbMarvel = {值:真,计数:getCount将('奇迹')};
$ scope.cbDCComics = {值:真,计数:getCount将(DC)};
和在你看来
<输入类型=复选框NG模型=cbMarvel.value/>奇迹[{{cbMarvel.count}}]
如果您的数据集是巨大的,而不是使用getCount将过滤器内,使用foreach并立即填充每种类型的计数。
逸岸你并不需要一个过滤器的话,那似乎是低效的使用,通过在你的情况下,过滤器相同的列表进行迭代。你的是一个静态列表控制器本身,以便对其进行分类。
VAR漫画= $ scope.comics = {}; //漫画词典
//这里创建集合。
angular.forEach(英雄,功能(ITM){
如果(!漫画[itm.comic]){
漫画[itm.comic] = {名称:itm.comic,值:真,数:1,项目:[ITM]};
返回;
} 漫画[itm.comic] .Count之间++; //增量计数
漫画[itm.comic] .items.push(ITM); //推动特定项目
});
和删除所有过滤器在您看来,做: -
< DIV NG重复=H在comics.Marvel.itemsNG秀=comics.Marvel.value>
{{h.name}} - {{h.comic}}
< / DIV>
< DIV NG重复=H在comics.DC.itemsNG秀=comics.DC.value>
{{h.name}} - {{h.comic}}
< / DIV>
I am showing subsets of a list if a checkbox is checked. I would like to replace the X next to the checkbox with the count of the list matching the selection criteria. I have a plunker that does everything but count the subset here.
My Controller looks like this:
var app = angular.module('app', []);
app.controller('MainController', function($scope){
$scope.cbMarvel = true;
$scope.cbDCComics = true;
$scope.heroes = [
{
id: 1,
name: 'Iron Man',
fname: 'Tony',
lname: 'Stark',
location: 'Stark Tower',
comic: 'Marvel'
},
{
id: 2,
name: 'Batman',
fname: 'Bruce',
lname: 'Wayne',
location: 'Bat Cave',
comic: 'DC'
},
{
id: 3,
name: 'Superman',
fname: 'Clark',
lname: 'Kent',
location: 'Metroplis',
comic: 'DC'
},
{
id: 1,
name: 'Daredevil',
fname: 'Jack',
lname: 'Murdock',
location: 'Court Room',
comic: 'Marvel'
},
{
id: 5,
name: 'Flash',
fname: 'Barry',
lname: 'Allen',
location: 'Speedline',
comic: 'DC'
},
{
id: 6,
name: 'Hulk',
fname: 'Bruce',
lname: 'Banner',
location: 'Labratory',
comic: 'Marvel'
},
{
id: 7,
name: 'Hawkeye',
fname: 'Clint',
lname: 'Barton',
location: 'Nest',
comic: 'Marvel'
},
{
id: 8,
name: 'Thor',
fname: 'Donald',
lname: 'Blake',
location: 'Asgard',
comic: 'Marvel'
}
];
});
And my view looks like this:
<!DOCTYPE html>
<html ng-app="app">
<head>
<link data-require="bootstrap@*" data-semver="3.2.0" rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.css" />
<link data-require="bootstrap-css@*" data-semver="3.2.0" rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" />
<script data-require="bootstrap@*" data-semver="3.2.0" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.js"></script>
<script data-require="jquery@2.0.3 current" data-semver="2.0.3" src="http://code.jquery.com/jquery-2.0.3.min.js"></script>
<script data-require="angular.js@1.2.20" data-semver="1.2.20" src="https://code.angularjs.org/1.2.20/angular.js"></script>
<script data-require="angular-ui-bootstrap@*" data-semver="0.11.0" src="http://angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.11.0.min.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
</head>
<body ng-controller="MainController">
<fieldset>
<legend>Comments Log</legend>
<div class="row">
<div class="col-md-4">
<input type="checkbox" ng-model="cbMarvel"/> Marvel [X]
</div>
<div class="col-md-4"> </div>
<div class="col-md-4">
<input type="checkbox" ng-model="cbDCComics"/> DC Comics [X]
</div>
</div>
<div class="row"> </div>
<div class="row col-md-10">
<div ng-if="heroes.length == 0"><b>No Heroes Found!</b>
</div>
<div ng-repeat="h in heroes | filter:{comic:'Marvel'}" ng-show="cbMarvel">
{{ h.name}} - {{h.comic}}
</div>
<div ng-repeat="h in heroes | filter:{comic:'DC'}" ng-show="cbDCComics">
{{ h.name}} - {{h.comic}}
</div>
</div>
</fieldset>
</body>
</html>
You could set that count in the view model itself while binding the data or just have a method on the scope that returns the count.
app.controller('MainController', function($scope, filterFilter){
....
$scope.getCount = function(strCat){
return filterFilter( $scope.heroes, {comic:strCat}).length;
}
...
});
and use it as:-
Marvel [{{getCount("Marvel")}}]
.....
DC Comics [{{getCount("DC")}}]
If the list is non changing when you are on the page i would suggest finding out the length and binding it to a property in the view model itself, and use it in the view.
//Set your data model
$scope.cbMarvel = {value:true, count:getCount('Marvel')};
$scope.cbDCComics = {value:true, count:getCount('DC')};
and in your view
<input type="checkbox" ng-model="cbMarvel.value"/> Marvel [{{cbMarvel.count}}]
If your dataset is huge, instead of using filter inside the getCount, use a forEach and populate the count for each type at once.
Infact you do not need a filter at all, it seems inefficient to iterate through the same list using a filter in your case. Your's is a static list so categorize it in the controller itself.
var comics = $scope.comics = {}; //Dictionary of comics
//Create the collection here.
angular.forEach(heroes, function(itm){
if(!comics[itm.comic]){
comics[itm.comic] = {name:itm.comic, value:true, count:1, items:[itm] };
return;
}
comics[itm.comic].count++; //Incr count
comics[itm.comic].items.push(itm); //push specific item
});
and remove all the filters in your view and do:-
<div ng-repeat="h in comics.Marvel.items" ng-show="comics.Marvel.value">
{{ h.name}} - {{h.comic}}
</div>
<div ng-repeat="h in comics.DC.items" ng-show="comics.DC.value">
{{ h.name}} - {{h.comic}}
</div>
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