如何根据ng-options中的特定属性计算唯一结果 [英] How to count unique results based on a particular properties within ng-options
本文介绍了如何根据ng-options中的特定属性计算唯一结果的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在使用AngularJS,并试图创建一个过滤器来搜索属性.
I'm working with AngularJS and trying to create a filter to search properties.
我有一个这样的选择框:
I've got a select box like this:
<select
class="selectBox"
multiple="multiple"
ng-model="selectedSubArea"
ng-options="property.SubArea as (property.SubArea + ' ('+ filtered.length +')') for property in filtered = (properties | unique:'SubArea') | orderBy:'SubArea'">
</select>
这是独特的功能:
myApp.filter('unique', function() {
return function(input, key) {
var unique = {};
var uniqueList = [];
for(var i = 0; i < input.length; i++){
if(typeof unique[input[i][key]] == "undefined"){
unique[input[i][key]] = "";
uniqueList.push(input[i]);
}
}
return uniqueList;
}; });
如何让filtered.length
工作?
这是我的 JSFiddle
推荐答案
这是一个解决方案:
http://jsfiddle.net/odpw6c6q/16/
创建一个过滤器,该过滤器返回带有计数(对象在原始列表中的次数)的对象:
Create a filter that returns objects with count (number of times they were in the original list):
myApp.filter('uniqueWithCount', function() {
return function(input, key) {
var unique = {};
var uniqueList = [];
var obj, val;
for(var i = 0; i < input.length; i++){
val = input[i][key];
obj = unique[val];
if (!obj) {
obj = unique[val] = {data: input[i], count: 0};
uniqueList.push(obj);
}
obj.count++;
}
return uniqueList;
};
});
在HTML中使用该过滤器:
Use that filter in your HTML:
<select class="form-control" multiple="multiple" ng-model="selectedSubArea"
ng-options="property.SubArea as (item.data.SubArea + ' ('+ item.count +')') for item in filtered = (properties | uniqueWithCount:'SubArea') | orderBy:'SubArea'"></select>
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