AngularJS自定义过滤器在ng-repeat

angularjs custom filter in ng-repeat

本文关键字：ng-repeat 过滤器 自定义 AngularJS      更新时间：2023-09-26

我正在尝试通过自定义过滤器从 JSON 响应返回唯一值。

数据：

[
{
    "SHFUserID": "400",
    "AlertID": "12",
    "TickerID": "4512",
    "Ticker": "GOOG",
    "Active": "1",
    "Status": "2"
},
{
    "SHFUserID": "400",
    "AlertID": null,
    "TickerID": "4512",
    "Ticker": "GOOG",
    "Active": null,
    "Status": null
},
{
    "SHFUserID": "400",
    "AlertID": null,
    "TickerID": "10190",
    "Ticker": "IBM",
    "Active": null,
    "Status": null
}
]

滤波器：

.filter('uniqueTickers', function() {
return function(tickers) {
    var tags = {};
    angular.forEach(tickers, function(obj) {
      if(!(obj.Ticker in tags)){
        tags[obj.Ticker] = {id: obj.TickerID, name:obj.Ticker}
        if(!tags[obj.Ticker].pending){
          tags[obj.Ticker].pending = 0;
        }
        if(!tags[obj.Ticker].settled){
          tags[obj.Ticker].settled = 0;
        }
        if(!tags[obj.Ticker].order){
          tags[obj.Ticker].order = 3;
        }
      }
  if(obj.Status === "1"){
    tags[obj.Ticker].pending = 1;
    if(tags[obj.Ticker].order > 2){
      tags[obj.Ticker].order = 2;
    }
  }
  if(obj.Status === "2"){
    tags[obj.Ticker].settled = 1;
    if(tags[obj.Ticker].order > 1){
      tags[obj.Ticker].order = 1;
    }
  };
    });
return tags;
};

.html：

 Search: <input ng-model="query">
  Sort by:
  <select ng-model="orderProp">
    <option value="name">Alphabetical</option>
    <option value="order">Alert Status</option>
  </select>
  <ul class="tickerList">
    <li ng-repeat="ticker in tickers | filter:query | orderBy:orderProp | uniqueTickers">
      <a href="#/ticker/{{ticker.id}}">{{ticker.name}}</a>
      <p>{{ticker}}</p>
    </li>
  </ul>

但结果看起来像：

GOOG
{"id":"4512","name":"GOOG","pending":0,"settled":0,"order":3}
IBM
{"id":"10190","name":"IBM","pending":0,"settled":0,"order":3}

而不是：

GOOG
{"id":"4512","name":"GOOG","pending":0,"settled":1,"order":1}
IBM
{"id":"10190","name":"IBM","pending":0,"settled":0,"order":3}

目标是保持结果集唯一，但如果该代码的任何记录处于挂起或已结算状态，则将"挂起"或"已结算"设置为 true。

经过一番讨论，答案是通过在逻辑的第一部分周围添加检查来避免过度使用现有数据，如下所示：

if(!(obj.Ticker in tags)){
    tags[obj.Ticker] = {id: obj.TickerID, name:obj.Ticker};
    if(!tags[obj.Ticker].pending){
      tags[obj.Ticker].pending = 0;
    }
    if(!tags[obj.Ticker].settled){
      tags[obj.Ticker].settled = 0;
    }
    if(!tags[obj.Ticker].order){
      tags[obj.Ticker].order = 3;
    }
}
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