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Closed 12 years ago.

如果我对空阵列的空阵列([])采用加固式可观测阵列的功能,我就会发现内部阵列没有界定的错误。只有在空阵作为参数建造的可观测的Array物体上才会发生这种情况。

这可能是一种ug,但也许/完全是,我只是失踪了。

以下例子与空阵线合著:

http://jsfiddle.net/adamtolley/4pZhR/32/“rel=”_http://jsfiddle.net/adamtolley/4pZhR/32/。

传真:

    <ul data-bind="template: { name:  outerTmpl , foreach: outerArray}"></ul>
Number of inner items: <span data-bind="text: innerCount"></span>
<hr />

<div data-bind="text: ko.toJSON(viewModel)"></div>

<script id="outerTmpl" type="text/html">
    <li>
        <span data-bind="text: name"></span>
        <ul data-bind="template: { name:  innerTmpl , foreach: innerArray}"></ul>
    </li>
</script>

<script id="innerTmpl" type="text/html">
    <li>
        <span data-bind="text: name" />
    </li>
</script>

The JS:

function outer(name, innerArray) {
    return {
        name: ko.observable(name),
        innerArray: ko.observableArray(innerArray)
    };
}

function inner(name) {
    return {
        name: ko.observable(name)
    };
}

var viewModel = {
    outerArray: ko.observableArray([
        new outer("outer1", [new inner("inner1"), new inner("inner2")]),
        new outer("outer2", [new inner("inner1"), new inner("inner2")]) //,
        // new outer("outer3", []) //does not work with this line uncommented. 
    ])
};

//use of innerArray().length vs innerArray.length seems to make no difference in error   
viewModel.innerCount = ko.dependentObservable(function() {
    return this.outerArray().reduce(function(i, j) {
        return i.innerArray.length + j.innerArray.length;
    });
}, viewModel);


ko.applyBindings(viewModel);

Answer 1

我认为,你们想要的是:

viewModel.innerCount = ko.dependentObservable(function() {
    return this.outerArray().reduce(function(i, j) {
        var count = i.innerArray ? i.innerArray().length : i;
        return count + j.innerArray().length;
    });
}, viewModel);

问题在于,减少将通过在下个代号上的以往结果。因此,你只有两阵列在首批中。

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