我刚开始玩KO，因为我想将它带入即将到来的项目中。在我的业余时间，我一直在玩工作中的Web服务，这基本上是从对数据做一些事情开始，然后做其他事情。首先，我刚刚返回了一份药物名称清单。好的，让我们添加一个返回结果的计数。好的，让我们用模态填充个别药物的详细信息。好的，让我们编辑药品名称。没有真正的押韵或理由，只是拿出东西并和KO一起玩。
我现在还不确定如何真正管理我的数据，以便随处更新。我制作了一个截图，引导您了解我所拥有的内容并说明问题。
问题在于，它没有利用KO的可观察性质......如果我要关闭模态并再次点击“Yasmin 28”药物链接，该模式将显示“Yasmin 28”不是我刚刚改变它（“一些美妙的东西”）。
我不太确定如何跟踪我的observableArray中属性是否发生变化。我制作了两个observableArrays，一个包含搜索结果的药物名称列表，另一个包含药物的详细信息。我还对目前的药物名称进行了观察。
有人可以解释我需要做什么来跟踪我的药品名称吗？我已经包含了下面的代码以及我在最底层工作的JSON。
<div id="shell">
<button class="load" value="j">j</button>
<button class="load" value="k">k</button>
<button class="load" value="x">x</button>
<button class="load" value="y">y</button>
<button class="load" value="z">z</button>
<p id="loading"><img src="#{facesContext.externalContext.requestContextPath}/img/spinner.gif"/></p>
<h3 data-bind="visible: drugList().length > 0"><span data-bind="text: count" class="count"></span> records returned</h3>
<ul data-bind="foreach: drugList">
<li>
<span data-bind="text: drugName" class="results_drug_name"></span>
<a data-bind="click: $root.showDetails" href="#" class="show">show details</a>
</li>
</ul>
</div>
<!-- start modal: drug details -->
<div id="dialog" data-bind="jqDialog: {autoOpen: false, title: drugName}">
<p id="dialog_save_message" class="message_success">Changes saved successfully!!!!!!!!</p>
<table data-bind="foreach: drugListDetails" class="table" width="100%" cellpadding="0" cellspacing="0" border="1">
<tr>
<th scope="row">pdlId</th>
<td data-bind="text: pdlId"></td>
</tr>
<tr>
<th scope="row">drugName</th>
<td>
<span data-bind="text: $root.drugName" class="readonly"></span>
<input id="edit_drugname" class="edit_textfield" type="text" value="" size="35" />
<button data-bind="click: $root.editSave" class="edit_buttons save">Save</button>
<button data-bind="click: $root.editCancel" class="edit_buttons cancel">Cancel</button>
<ul class="detail_actions">
<li><a data-bind="click: $root.edit" href="#" class="edit">edit</a></li>
</ul>
</td>
</tr>
<tr>
<th scope="row">dosageFormDesc</th>
<td data-bind="text: dosageFormDesc"></td>
</tr>
<tr>
<th scope="row">strength</th>
<td data-bind="text: strength"></td>
</tr>
<tr>
<th scope="row">activeIngredient</th>
<td data-bind="text: activeIngredient"></td>
</tr>
<tr>
<th scope="row">tier</th>
<td data-bind="text: tier"></td>
</tr>
<tr>
<th scope="row">ancillaryCharge</th>
<td data-bind="text: ancillaryCharge"></td>
</tr>
<tr>
<th scope="row">preauthCode</th>
<td data-bind="text: preauthCode"></td>
</tr>
<tr>
<th scope="row">quantityLimit</th>
<td data-bind="text: quantityLimit"></td>
</tr>
<tr>
<th scope="row">prefAlternative</th>
<td data-bind="text: prefAlternative"></td>
</tr>
<tr>
<th scope="row">specialtyDrug</th>
<td data-bind="text: specialtyDrug"></td>
</tr>
<tr>
<th scope="row">partbCob</th>
<td data-bind="text: partbCob"></td>
</tr>
<tr>
<th scope="row">drugClassGroupId</th>
<td data-bind="text: drugClassGroupId"></td>
</tr>
<tr>
<th scope="row">drugClassId</th>
<td data-bind="text: drugClassId"></td>
</tr>
<tr>
<th scope="row">drugClass</th>
<td data-bind="text: drugClass"></td>
</tr>
<tr>
<th scope="row">genericInd</th>
<td data-bind="text: genericInd"></td>
</tr>
<tr>
<th scope="row">tip</th>
<td data-bind="text: tip"></td>
</tr>
</table>
</div>
<!-- end modal: drug details -->
<script>
$(function() {
$('.load').click(function() {
var $letter = $(this).attr('value');
//show spinner
$('#loading').show();
//load in drug list data
$.getJSON('/PreferredDrugList/service/preferredDrugs/' + $letter, function(data) {
//hide spinner
$('#loading').hide();
//replace drugList observableArray data
//preferredDrugs is an array of objects, each elem is an individual drug
myViewModel.drugList(data.preferredDrugs);
//replace count observable data
myViewModel.count(data.count);
});//end getJSON
});//end click
//setup modal dialog options
$('#dialog').dialog({
autoOpen: false,
closeOnEscape: true,
modal: true,
width:850,
height:500
});
});//end ondomready
//custom binding to initialize a jQuery UI dialog
ko.bindingHandlers.jqDialog = {
init: function(element) {
ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
$(element).dialog("destroy");
});
},
update: function(element, valueAccessor) {
var options = ko.toJS(valueAccessor());
if (options) {
$(element).dialog(options);
}
}
};
var myViewModel = {
count: ko.observable(), //# of records returned
drugList: ko.observableArray(), //list of drug names - an array of objects
drugListDetails: ko.observableArray(), //list of individual drug details
drugName: ko.observable(), //current drug name
//show drug details in modal
//func gets passed the current observableArray elem (the individual drug info we clicked on, this is an object)
showDetails: function(obj) {
//replace current drug name observable data
myViewModel.drugName(obj.drugName);
//replace drugListDetails observableArray data, otherwise we'll append data to the modal
myViewModel.drugListDetails([]);
//push individual drug info to details observableArray
myViewModel.drugListDetails.push(obj);
//show dialog
$('#dialog').dialog('open');
return false;
},
//edit drug from modal
edit: function(obj) {
var $edit = $('#dialog').find('td .edit'),
$currentTD = $edit.closest('td');
$currentTD.addClass('editing');
$currentTD.find('.readonly').hide();
$currentTD.find('.edit_textfield').show().select();
$currentTD.find('.edit_buttons').show();
return false;
},
//save an edit
editSave: function(obj) {
alert('TODO save back to the server');
var $saveBtn = $('#dialog').find('td .save'),
$currentTD = $saveBtn.closest('td'),
newDrugName = $('#edit_drugname').val(),
$dialog_save_message = $('#dialog_save_message');
//save new drug name to observable
myViewModel.drugName(newDrugName);
$currentTD.removeClass('editing');
$currentTD.find('.readonly').show();
$currentTD.find('.edit_textfield').hide();
$currentTD.find('.edit_buttons').hide();
$dialog_save_message.slideDown('slow', function() {
//animation complete
setTimeout(function() {
$dialog_save_message.slideUp();
}, 3000);
});
//cheat and update search results list with new drug name
$('.results_drug_name').each(function(index, elem) {
var $text = $(this).text();
if ($text === obj.drugName) {
$(this).text(newDrugName).addClass('edited');
}
});
},
//cancel an edit
editCancel: function(obj) {
var $cancelBtn = $('#dialog').find('td .cancel'),
$currentTD = $cancelBtn.closest('td');
$currentTD.removeClass('editing');
$currentTD.find('.readonly').show();
$currentTD.find('.edit_textfield').hide();
$currentTD.find('.edit_buttons').hide();
}
};
ko.applyBindings(myViewModel);
<!--what's returned from the web service-->
<pre>
{
"preferredDrugs": [(8)
{
"pdlId": 8090,
"drugName": "y-cof-dmx",
"dosageFormDesc": "Liquid",
"strength": "4MG/5ML; 15MG/5ML; 7.5MG/5ML",
"activeIngredient": "BROMPHENIRAMINE MALEATE; DEXTROMETHORPHAN HYDROBROMIDE; PHENYLEPHRINE HYDROCHLORIDE",
"tier": "OTC",
"ancillaryCharge": "NA",
"preauthCode": " ",
"quantityLimit": " ",
"prefAlternative": null,
"specialtyDrug": " ",
"partbCob": " ",
"drugClassGroupId": 74,
"drugClassId": 152,
"drugClass": "Respiratory Tract Agents » Antitussives",
"genericInd": "1",
"tip": " "
},-
{
"pdlId": 13417,
"drugName": "YASMIN 28",
"dosageFormDesc": "Tablet",
"strength": "3MG; 0.03MG",
"activeIngredient": "DROSPIRENONE; ETHINYL ESTRADIOL",
"tier": "3",
"ancillaryCharge": "AC",
"preauthCode": " ",
"quantityLimit": "28.0 tabs each 28 days",
"prefAlternative": "ethinyl estradiol/drospirenone",
"specialtyDrug": " ",
"partbCob": " ",
"drugClassGroupId": 3,
"drugClassId": 200,
"drugClass": "Hormones and Synthetic Substitutes » Contraceptives",
"genericInd": "0",
"tip": " "
},-
{
"pdlId": 24765,
"drugName": "YAZ",
"dosageFormDesc": "Tablet",
"strength": "3MG; 0.02MG",
"activeIngredient": "DROSPIRENONE; ETHINYL ESTRADIOL",
"tier": "3",
"ancillaryCharge": "AC",
"preauthCode": " ",
"quantityLimit": "28.0 tabs each 28 days",
"prefAlternative": "ethinyl estradiol/drospirenone",
"specialtyDrug": " ",
"partbCob": " ",
"drugClassGroupId": 3,
"drugClassId": 200,
"drugClass": "Hormones and Synthetic Substitutes » Contraceptives",
"genericInd": "0",
"tip": " "
},-
{
"pdlId": 2252,
"drugName": "YERVOY",
"dosageFormDesc": "Solution",
"strength": "50MG/10ML",
"activeIngredient": "IPILIMUMAB",
"tier": "NC",
"ancillaryCharge": "NA",
"preauthCode": " ",
"quantityLimit": " ",
"prefAlternative": null,
"specialtyDrug": " ",
"partbCob": " ",
"drugClassGroupId": 115,
"drugClassId": 1,
"drugClass": "Antineoplastic Agents",
"genericInd": "0",
"tip": " "
},-
{
"pdlId": 20993,
"drugName": "YERVOY",
"dosageFormDesc": "Solution",
"strength": "200MG/40ML",
"activeIngredient": "IPILIMUMAB",
"tier": "NC",
"ancillaryCharge": "NA",
"preauthCode": " ",
"quantityLimit": " ",
"prefAlternative": null,
"specialtyDrug": " ",
"partbCob": " ",
"drugClassGroupId": 115,
"drugClassId": 1,
"drugClass": "Antineoplastic Agents",
"genericInd": "0",
"tip": " "
},-
{
"pdlId": 564,
"drugName": "YF-VAX",
"dosageFormDesc": "Injection",
"strength": "0",
"activeIngredient": "YELLOW FEVER VACCINE",
"tier": "NC",
"ancillaryCharge": "NA",
"preauthCode": " ",
"quantityLimit": " ",
"prefAlternative": null,
"specialtyDrug": " ",
"partbCob": " ",
"drugClassGroupId": 79,
"drugClassId": 284,
"drugClass": "Serums, Toxoids and Vaccines » Vaccines",
"genericInd": "0",
"tip": " "
},-
{
"pdlId": 8910,
"drugName": "yodefan-nf chest congestion",
"dosageFormDesc": "Liquid",
"strength": "200MG/5ML",
"activeIngredient": "GUAIFENESIN",
"tier": "OTC",
"ancillaryCharge": "NA",
"preauthCode": " ",
"quantityLimit": " ",
"prefAlternative": null,
"specialtyDrug": " ",
"partbCob": " ",
"drugClassGroupId": 84,
"drugClassId": 155,
"drugClass": "Respiratory Tract Agents » Expectorants",
"genericInd": "1",
"tip": " "
},-
{
"pdlId": 13101,
"drugName": "YODOXIN",
"dosageFormDesc": "Tablet",
"strength": "650MG",
"activeIngredient": "IODOQUINOL",
"tier": "3",
"ancillaryCharge": "NA",
"preauthCode": " ",
"quantityLimit": " ",
"prefAlternative": "iodoquinol",
"specialtyDrug": " ",
"partbCob": " ",
"drugClassGroupId": 164,
"drugClassId": 277,
"drugClass": "Anti-infective Agents » Antiprotozoals",
"genericInd": "0",
"tip": " "
}-
],-
"count": 8
}
</pre>
</script>
答案 0 :(得分：1)
首先，删除drugListDetails数组，因为它会导致数据重复造成混淆。
第二次，使用ko.mapping.fromJS和ko.mapping.toJS将data.preferredDrugs映射到可观察数组和从可观察数组映射。这将允许knockout跟踪数组中每个元素的GUI更改。可以找到这些文档here。
如果您不想使用mapping插件，也可以手动执行映射。
第三次，向showDetails数组中默认为data.preferredDrugs的每个条目添加一个新的false元素。这将在下一步中用于确定是否应显示对话框。在调用现有showDetails时，需要切换$root.showDetails元素。
第四次，修改对话框div以使用drugList数组并将其visible值绑定到每个药物元素的showDetails值。这将创建多个隐藏的对话框，因此您可能希望更改每个的id值。