Question

我有一个observableArray和一个可观察的如下。

self.unreadcount = ko.observable();

self.searchFilters = ko.observableArray([
    {label: "A", active: ko.observable(false), count1: self.unreadcount()},
    {label: "B", active: ko.observable(false), count1: self.unreadcount()},
    {label: "C", active: ko.observable(false), count1: self.unreadcount()}
]);

在一个特定的函数中，我已将一些值传递给self.unreadcount（），我也需要相应地更新我的observableArray。我怎么能这样做？

Answer 1

您可以使用count1 observable设置self.unreadcount属性。

self.searchFilters = ko.observableArray([
    {label: "A", active: ko.observable(false), count1: self.unreadcount},
    {label: "B", active: ko.observable(false), count1: self.unreadcount},
    {label: "C", active: ko.observable(false), count1: self.unreadcount}
]);

See fiddle

或者可以将count1属性绑定到$parent.unreadcount：

<div data-bind="foreach : searchFilters">
    <span data-bind="text : label"></span> 
    <span data-bind="text : $parent.unreadcount"></span>
    <br/>
</div>

JS

var VM = function () {
    var self = this;
    self.unreadcount = ko.observable();

   self.searchFilters = ko.observableArray([
    {label: "A", active: ko.observable(false)},
    {label: "B", active: ko.observable(false)},
    {label: "C", active: ko.observable(false)}
   ]);
};

See fiddle

如果您需要手动更新count1;你可以这样做：

self.searchFilters = ko.observableArray([
    {label: "A", active: ko.observable(false), count1: ko.observable(self.unreadcount())},
    {label: "B", active: ko.observable(false), count1: ko.observable(self.unreadcount())},
    {label: "C", active: ko.observable(false), count1: ko.observable(self.unreadcount())}
]);

self.update = function(newValue) {
    ko.utils.arrayForEach( self.searchFilters(), function(row) {
        row.count1(newValue);
    });
}

See fiddle

Answer 2

我不确定这是不是你所追求的，但我创建了一个JSFiddle：http://jsfiddle.net/RFc3r/2/，它使用你的observableArray并允许你更新每行的计数。

标记：

<p data-bind="text: ko.toJSON(searchFilters)"></p>
<div class="liveExample" data-bind="foreach: searchFilters"> 
   <p>Label:<input data-bind="value: label"></input></p>
   <p>Active:<input type="checkbox" data-bind="checked: active"></input></p>
   <p>Unread:<input data-bind="value: count1"></input></p>
   <input type="button" data-bind="click: changeValue(count1)" value="click me"/>
   <hr/>
</div>

JS：

var ViewModel = function () {
    self.unreadcount = ko.observable(0);

    self.searchFilters = ko.observableArray([{
        label: "A",
        active: ko.observable(false),
        count1: ko.observable(self.unreadcount())
    }, {
        label: "B",
        active: ko.observable(true),
        count1: ko.observable(self.unreadcount())
    }, {
        label: "C",
        active: ko.observable(false),
        count1: ko.observable(self.unreadcount())
    }]);

    self.changeValue = function(item){
       item(item() + 1); 
    };
};

ko.applyBindings(new ViewModel());

更新ObservableArray knockoutjs中的可观察值

2 个答案: