[英]Filter knockout observable array
在我當前的項目中,我正在使用下划線過濾器,該過濾器可在我的提琴上使用,但不適用於我的當前項目,我想做的是改為使用剔除過濾器,但我不確定該怎么做。
這是我使用下划線過濾器的內容
HTML
<div data-bind="foreach: items">
<div class="profile" data-bind="text: name, click: $parent.clicked, enable: active, css:{highlight: active()}"></div>
</div>
<hr>
<h2>Selected Card</h2>
<div data-bind="foreach: selectedItems">
<div data-bind="text: name"></div>
</div>
<input type="button" data-bind="click: save" value="Save">
CSS
.profile {
width: 50px;
height: 80px;
color: black;
background-color:silver;
border: 1px solid black;
float: left;
line-height:80px;
text-align: center;
margin: 2px;
}
.highlight {
background: yellow !important;
border:1px solid #000;
color: black;
}
JavaScript的
function Card(number) {
this.active = ko.observable(false);
this.name = ko.observable(number);
}
var model = function () {
var cards = [1, 2, 3, 5, 8, 13, 20, 40, 100];
for (var i = 0 ; i < cards.length ; i++)
cards[i] = new Card(cards[i]);
var items = ko.observableArray(cards)
var selectedItems = ko.computed(function () {
return _.filter(items(), function (item) {
return item.active();
});
})
var clicked = function (item) {
items().forEach(function (item) { item.active(false) });
item.active(!this.active());
};
var save = function () {
alert("sending items \n" + ko.toJSON(selectedItems()));
}
return {
items: items,
selectedItems: selectedItems,
save: save,
clicked: clicked
}
}
ko.applyBindings(model);
如果未正確設置此關鍵字,您可能會感到困惑。 我建議您使用self關鍵字來解決您的困惑。 另外,我看到您揭示的模塊模式最后缺少括號。 這是固定的JavaScript:
function Card(number) {
this.active = ko.observable(false);
this.name = ko.observable(number);
}
var model = function () {
var self = this;
self.cards = [1, 2, 3, 5, 8, 13, 20, 40, 100];
for (var i = 0 ; i < cards.length ; i++)
cards[i] = new Card(cards[i]);
self.items = ko.observableArray(cards)
self.selectedItems = ko.computed(function () {
return _.filter(items(), function (item) {
if(item.active())
{
return item;
}
});
})
self.clicked = function (item) {
item.active(true);
};
self.save = function () {
alert("sending items \n" + ko.toJSON(selectedItems()));
}
return {
items: items,
selectedItems: selectedItems,
save: save,
clicked: clicked
}
}();
ko.applyBindings(model);
您可以在此處檢查更新的JSFiddle。
此外,如果您不想使用下划線過濾選項,則也可以使用剔除過濾器:
function Card(number) {
this.active = ko.observable(false);
this.name = ko.observable(number);
}
var model = function () {
var self = this;
self.cards = [1, 2, 3, 5, 8, 13, 20, 40, 100];
for (var i = 0 ; i < cards.length ; i++)
cards[i] = new Card(cards[i]);
self.items = ko.observableArray(cards)
self.selectedItems = ko.computed(function () {
return ko.utils.arrayFilter(self.items(), function(item) {
if(item.active())
{
return item;
}
});
});
self.clicked = function (item) {
item.active(true);
};
self.save = function () {
alert("sending items \n" + ko.toJSON(selectedItems()));
}
return {
items: items,
selectedItems: selectedItems,
save: save,
clicked: clicked
}
}();
ko.applyBindings(model);
這是第二個選項的JSFiddle。
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