3
我遇到了一个问题,即删除可观察数组中的对象。我有一个removeItemFromQueue
函数应该从队列中删除选定的对象。从observableArray中删除对象
This example表明,如果你添加了一堆的项目到队列中,然后取出一个,它消除了所有的人:
<h3>Items:</h3>
<ul data-bind="template: {name:'itemsTemplate', foreach: items}"></ul>
<h3>Queue:</h3>
<ul data-bind="template: {name:'queueTemplate', foreach: queue}"></ul>
<script id="itemsTemplate" type="text/x-jquery-tmpl">
<li>
<a href="#">${$data.title}</a> by <a href="#">${$data.description}</a>
<button data-bind="click: function() {viewModel.removeItemFromPage($data);}">Remove From Page</button>
<button data-bind="click: function() {viewModel.addItemToQueue($data);}">Add To Queue</button>
</li>
</script>
<script id="queueTemplate" type="text/x-jquery-tmpl">
<li>
<a href="#">${$data.title}</a> by <a href="#">${$data.description}</a>
<button data-bind="click: function() {viewModel.removeItemFromQueue($data);}">Remove From Queue</button>
</li>
</script>
这是JavaScript:
function Item(title, description) {
this.title = ko.observable(title);
this.description = ko.observable(description);
}
var viewModel = {
items: ko.observableArray([
new Item("one", "one description")
]),
queue: ko.observableArray([]),
addItemToQueue: function (item) {
this.queue.push(item);
},
removeItemFromPage: function (item) {
this.items.remove(item);
},
removeItemFromQueue: function (item) {
this.queue.remove(item);
}
};
ko.applyBindings(viewModel);
我发现this workaround使用ko.toJS(item)
在addItemToQueue
功能:
<h3>Items:</h3>
<ul data-bind="template: {name:'itemsTemplate', foreach: items}"></ul>
<h3>Queue:</h3>
<ul data-bind="template: {name:'queueTemplate', foreach: queue}"></ul>
<script id="itemsTemplate" type="text/x-jquery-tmpl">
<li>
<a href="#">${$data.title}</a> by <a href="#">${$data.description}</a>
<button data-bind="click: function() {viewModel.removeItemFromPage($data);}">Remove From Page</button>
<button data-bind="click: function() {viewModel.addItemToQueue($data);}">Add To Queue</button>
</li>
</script>
<script id="queueTemplate" type="text/x-jquery-tmpl">
<li>
<a href="#">${$data.title}</a> by <a href="#">${$data.description}</a>
<button data-bind="click: function() {viewModel.removeItemFromQueue($data);}">Remove From Queue</button>
</li>
</script>
和这个Javascript:
function Item(title, description) {
this.title = ko.observable(title);
this.description = ko.observable(description);
}
var viewModel = {
items: ko.observableArray([
new Item("one", "one description")
]),
queue: ko.observableArray([]),
addItemToQueue: function (item) {
this.queue.push(ko.toJS(item));
},
removeItemFromPage: function (item) {
this.items.remove(item);
},
removeItemFromQueue: function (item) {
this.queue.remove(item);
}
};
ko.applyBindings(viewModel);
是否有更简单的方法?
另外,这里的购物车示例看起来使用与我的第一个示例类似的代码,但不会遇到与删除项目相同的问题。我有点困惑。
以下是购物车示例:http://knockoutjs.com/examples/cartEditor.html – horizens