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javascript - knockout 组列表为带有对象的更小列表

转载 作者:数据小太阳 更新时间:2023-10-29 05:33:14 24 4
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我有多名员工的每日数据,根据开始时间和结束时间,这可能意味着大量数据。

因此,通过映射插件,我将它们映射到一个大列表中,但我需要将它们按员工分组到更小的列表中,这样我就可以为每个员工创建一个表(如更小的 View 模型),该表具有针对该子集的过滤和排序数据。

这是我用静态数据创建的一个基本示例。

$(function () {
var data = {
Employees: [{
Id: 1,
Name: "Employee1",
Day: new Date(),
Price: 12.54
}, {
Id: 2,
Name: "Employee2",
Day: new Date(),
Price: 112.54
}, {
Id: 1,
Name: "Employee1",
Day: new Date(),
Price: 12.54
}, {
Id: 3,
Name: "Employee3",
Day: new Date(),
Price: 12.54
}]
};

// simulate the model to json conversion. from now on i work with the json
var jsonModel = JSON.stringify(data);

function employeeModel(data) {
var employeeMapping = {
'copy': ["Id", "Name", "Day", "Price"]
};
ko.mapping.fromJS(data, employeeMapping, this);
}

function employeeViewModel(data) {
var self = this;
var employeesMapping = {
'Employees': {
create: function (options) {
return new employeeModel(options.data);
}
}
};
ko.mapping.fromJSON(data, employeesMapping, self);
}

var productsModel = new employeeViewModel(jsonModel);
ko.applyBindings(productsModel);
});
table {
border-collapse: collapse;
}
table, th, td {
border: 1px solid black;
}
tr:nth-child(even) {
background-color: white;
}
tr:nth-child(odd) {
background-color: #C1C0C0;
}
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/knockout.mapping/2.4.1/knockout.mapping.js"></script>
<table>
<tbody data-bind="foreach: Employees">
<tr>
<td><span data-bind="text:Id"></span>
</td>
<td><span data-bind="text:Name"></span>
</td>
<td><span data-bind="text:Day"></span>
</td>
<td><span data-bind="text:Price"></span>
</td>
</tr>
</tbody>
</table>

最佳答案

一种可能性是使用计算值对数据进行分组。

self.EmployeeGroups = ko.pureComputed(function () {
var employees = self.Employees(),
index = {},
group = [];

ko.utils.arrayForEach(employees, function(empl) {
var id = ko.unwrap(empl.Id);
if ( !index.hasOwnProperty(id) ) {
index[id] = {
grouping: {
Id: empl.Id,
Name: empl.Name
},
items: []
};
group.push(index[id]);
}
index[id].items.push(empl);
});

return group;
});

会将您的数据从平面数组转换为:

[{    grouping: {        Id: /* ... */,         Name: /* ... */    }    items: [/* references to all employee objects in this group */]}, {    /* same */}]

Expand the code snippet below to see it at work.

$(function () {
var data = {
Employees: [{
Id: 1,
Name: "Employee1",
Day: new Date(),
Price: 12.54
}, {
Id: 2,
Name: "Employee2",
Day: new Date(),
Price: 112.54
}, {
Id: 1,
Name: "Employee1",
Day: new Date(),
Price: 12.54
}, {
Id: 3,
Name: "Employee3",
Day: new Date(),
Price: 12.54
}]
};

var jsonModel = JSON.stringify(data);

function employeeModel(data) {
var employeeMapping = {
'copy': ["Id", "Name", "Day", "Price"]
};
ko.mapping.fromJS(data, employeeMapping, this);
}

function employeeViewModel(data) {
var self = this;

self.Employees = ko.observableArray();
self.EmployeeGroups = ko.pureComputed(function () {
var employees = self.Employees(),
index = {},
group = [];

ko.utils.arrayForEach(employees, function(empl) {
var id = ko.unwrap(empl.Id);
if ( !index.hasOwnProperty(id) ) {
index[id] = {
grouping: {
Id: empl.Id,
Name: empl.Name
},
items: []
};
group.push(index[id]);
}
index[id].items.push(empl);
});

return group;
});

// init
var employeesMapping = {
'Employees': {
create: function (options) {
return new employeeModel(options.data);
}
}
};
ko.mapping.fromJSON(data, employeesMapping, self);
}

var productsModel = new employeeViewModel(jsonModel);
ko.applyBindings(productsModel);
});
table {
border-collapse: collapse;
}
table, th, td {
border: 1px solid black;
}
tr:nth-child(even) {
background-color: #efefef;
}
tr:nth-child(odd) {
background-color: #CCCCCC;
}
tr.subhead {
background-color: #D6E3FF;
font-weight: bold;
}
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/knockout.mapping/2.4.1/knockout.mapping.js"></script>
<table>
<!-- ko foreach: EmployeeGroups -->
<tbody>
<!-- ko with: grouping -->
<tr class="subhead">
<td colspan="2">
<span data-bind="text: Id"></span>
<span data-bind="text: Name"></span>
</td>
</tr>
<!-- /ko -->
<!-- ko foreach: items -->
<tr>
<td><span data-bind="text: Day"></span></td>
<td><span data-bind="text: Price"></span></td>
</tr>
<!-- /ko -->
</tbody>
<!-- /ko -->
</table>

<pre data-bind="text: ko.toJSON($root, null, 2)" style="font-size: smallest;"></pre>

关于javascript - knockout 组列表为带有对象的更小列表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28363596/

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