使用挖空将数据从数据库加载到下拉列表
Load data from Database to DropDownList using Knockout
我正在使用挖空创建编辑可变长度列表。当我单击"添加"按钮时,它将向屏幕添加一个下拉列表和一个文本框。我已经成功地将数据从数据库加载到 DropDownList,但每次我单击添加按钮时,它总是填充数据。
法典:
<div class="form-horizontal" data-bind="with: purchaseOrder">
<h4>Purchase Order</h4>
<hr />
<div class="form-group">
<label class="control-label col-md-2" for="PurchaseOrderDate">PO Date</label>
<div class="col-md-10">
<input class="form-control" data-bind="value: PurchaseOrderDate" placeholder="Purchase Order Date" />
</div>
</div>
<div class="form-group">
<label class="control-label col-md-2" for="InvoiceNo">Invoice No</label>
<div class="col-md-10">
<input class="form-control" data-bind="value: InvoiceNo" placeholder="Invoice No" />
</div>
</div>
<div class="form-group">
<label class="control-label col-md-2" for="Memo">Memo</label>
<div class="col-md-10">
<input class="form-control" data-bind="value: Memo" placeholder="Enter Memo" />
</div>
</div>
</div>
<h4>Details</h4>
<hr />
<table class="table">
<thead>
<tr>
<th>Item Name</th>
<th>Qty Order</th>
<th></th>
</tr>
</thead>
<tbody data-bind="foreach: purchaseOrderDetails">
<tr>
<td>
<select class="form-control" data-bind="options: AX_INVENTSUMs, optionsText: 'ITEMNAME', optionValue: 'ITEMID'"></select>
</td>
<td>
<input class="form-control" data-bind="value: QuantityOrder" placeholder="Enter Quantity Order">
</td>
<td>
<a class="btn btn-sm btn-danger" href='#' data-bind=' click: $parent.removeItem'>X</a>
</td>
</tr>
</tbody>
</table>
<p>
<button class="btn btn-sm btn-primary" data-bind='click: addItem'>Add Item</button>
</p>
@section Scripts {
@Scripts.Render("~/bundles/knockout")
<script>
$(function () {
var PurchaseOrder = function (purchaseOrder) {
var self = this;
self.PurchaseOrderID = ko.observable(purchaseOrder ? purchaseOrder.PurchaseOrderID : 0);
self.PurchaseOrderDate = ko.observable(purchaseOrder ? purchaseOrder.PurchaseOrderDate : '');
self.InvoiceNo = ko.observable(purchaseOrder ? purchaseOrder.InvoiceNo : '');
self.Memo = ko.observable(purchaseOrder ? purchaseOrder.Memo : '');
};
var PurchaseOrderDetail = function (purchaseOrderDetail, items) {
var self = this;
self.PurchaseOrderDetailID = ko.observable(purchaseOrderDetail ? purchaseOrderDetail.PurchaseOrderDetailID : 0);
self.PurchaseOrderID = ko.observable(purchaseOrderDetail ? purchaseOrderDetail.PurchaseOrderDetailID : 0);
self.ItemID = ko.observable(purchaseOrderDetail ? purchaseOrderDetail.ItemID : 0);
self.QuantityOrder = ko.observable(purchaseOrderDetail ? purchaseOrderDetail.QuantityOrder : 0);
self.QuantityBonus = ko.observable(purchaseOrderDetail ? purchaseOrderDetail.QuantityBonus : 0);
self.AX_INVENTSUMs = ko.observableArray(items);
};
var PurchaseOrderCollection = function () {
var self = this;
self.purchaseOrder = ko.observable(new PurchaseOrder());
self.purchaseOrderDetails = ko.observableArray([new PurchaseOrderDetail()]);
self.CashedArray = ko.observableArray([]);
$.getJSON("/AX_INVENTSUM/GetAX_INVENTSUMs", null, function (data) {
var array = [];
$.each(data, function (index, value) {
array.push(value);
});
self.CashedArray(array);
});
self.addItem = function () {
self.purchaseOrderDetails.push(new PurchaseOrderDetail(null, self.CashedArray));
};
self.removeItem = function (purchaseOrderDetail) {
self.purchaseOrderDetails.remove(purchaseOrderDetail);
};
};
ko.applyBindings(new PurchaseOrderCollection());
});
</script>
}
正如您在上面的代码中看到的,如何使这种情况一次只发生一次?
您必须将列表缓存在某个位置。我更喜欢在父视图模型之类的东西中执行此操作。见下文。
var OrderList = function(){
var self = this;
...
self.CashedArray = ko.observableArray(new Array());
$.getJSON("/AX_INVENTSUM/GetAX_INVENTSUMs", null, function (data) {
var array = [];
$.each(data, function (index, value) {
array.push(value);
});
self.CashedArray(array);
});
self.AddButtonClick = function (){
var orderDetails = new PurchaseOrderDetail(self.CashedArray());
};
};
var PurchaseOrderDetail = function (items) {
var self = this;
...
self.AX_INVENTSUMs = ko.observableArray(items);
};
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