Question

我有一个称为事件的json对象数组，其中包含eventId，eventName和最重要的dateofevent等字段。

[{event1}，{event2}，{event3}];

我需要迭代这个事件数组并过滤掉同一天发生的事件。获得这样的新对象。

"days": [
    {
        "date": "11-05-2015",
        "events": [
            {"eventId": 1, ...},
            {"eventId": 2, ...},
            {"eventId": 3, ...},
            {"eventId": 4, ...},
        ]
    },

如何使用Javascript或Angular有效地完成此操作？

Answer 1

您可以使用日期作为键创建新对象，值是包含事件的数组。在你有了date =＆gt;之后事件映射，将其转换为所需结构中的数组。

假设原始数据位于名为＆＃34; events＆＃34;：

的变量中

    var events  = [{event 1}, {event 2}...];
    var daysMap = {};
    var days = [];
    events.map(function(event) {
        if (days[event.dateofevent] === undefined) {
            days[event.dateofevent] = [];
        }
        days[event.dateofevent].push(event);
    });
    for (var day in daysMap) {
        days.push({
            date: day, 
            events: daysMap[day]
        });
    }

Answer 2

HTML

<div ng-app>
    <span class="bold">Demonstrating filtering and sorting using Angular JS</span>
    <br /><br />
        <div ng-controller="ShoppingCartCtrl">        
            <div>Sort by: 
            <select ng-model="sortExpression">
                    <option value="Name">Name</option>
                    <option value="Price">Price</option>
                    <option value="Quantity">Quantity</option>
                </select>
            </div>
            <br />
            <div><strong>Filter Results</strong></div>
            <table>
                <tr>
                    <td>By Any: </td>
                    <td><input type="text" ng-model="search.$" /></td>
                </tr>
                <tr>
                    <td>By Name: </td>
                    <td><input type="text" ng-model="search.Name" /></td>
                </tr>
                <tr>
                    <td>By Price: </td>
                    <td><input type="text" ng-model="search.Price" /></td>
                </tr>
                <tr>
                    <td>By Quantity: </td>
                    <td><input type="text" ng-model="search.Quantity" /></td>
                </tr>
            </table>
            <br />
            <table border="1">
                <thead>
                    <tr>
                        <th>Name</th>
                        <th>Price</th>
                        <th>Quantity</th>
                    </tr>
                </thead>
                <tbody>
                    <tr ng-repeat="item in items | orderBy:mySortFunction | filter:search">
                        <td>{{item.Name}}</td>
                        <td>{{item.Price | currency}}</td>
                        <td>{{item.Quantity}}</td>
                    </tr>
                </tbody>
            </table>
            <br />
</div>
</div>

的Javascript

function ShoppingCartCtrl($scope)  {

        $scope.items = [
            {Name: "Soap", Price: "25", Quantity: "10"},
            {Name: "Shaving cream", Price: "50", Quantity: "15"},
            {Name: "Shampoo", Price: "100", Quantity: "5"}
        ];

        $scope.mySortFunction = function(item) {
            if(isNaN(item[$scope.sortExpression]))
                return item[$scope.sortExpression];
            return parseInt(item[$scope.sortExpression]);
        }
}

CSS

.bold { font-weight:bold; }

table td{
    padding: 10px;
}

table th{
    font-weight: bold;
    text-align: center;
}

demo_click here

如何过滤和构建此JSON？

2 个答案: