我的目标是显示“noSets”模板,如果observableArray长度小于0并使用项目详细信息渲染模板 - “showSets”,如果observableArray长度大于0.我想使用模板用于此目的,但FireBug显示错误:找不到ID为“templatename”的模板。 这是ViewModel:
function SetsViewModel() {
var self = this;
self.usersets = ko.observableArray();
self.getTemplate = function () {
return self.usersets().length > 0 ? "showSets" : "noSets";
}
}
$(document).ready(function () {
ko.applyBindings(new SetsViewModel(), document.getElementById('user_sets'));
});
这是HTML标记:
<div data-bind="template: { name: $root.getTemplate, foreach: usersets }" id="user_sets">
<script type="text/html" id="noSets">
<p>You do not have items yet.</p>
</script>
<script type="text/html" id="showSets">
<div class="block">
<input type="hidden" data-bind="value: $data.SetId" />
<div class="fav" data-bind="css: { fullop: $data.IsFavorite == true }">
<img alt="" src="img/fav.png" data-bind="click: $root.setFavorite">
</div>
<div>
<img alt="" data-bind="attr: { src: $data.SetImg }">
</div>
<div class="txt">
<h3 data-bind="text: $data.SetName, click: $root.go"></h3>
<p><span data-bind="text: $data.ItemsNumber + ' вещей,'"></span><span data-bind=" text: ' общая цена ' + $data.SetPrice + ' руб'"></span></p>
</div>
</div>
</script>
</div>
我该如何解决?
答案 0 :(得分:1)
您可以在div
之外声明您要绑定的模板作为解决方法。正如@JeffMercado所说:
实际问题是,由于user_sets使用模板绑定,因此主体将被丢弃(以及模板及其中)
function SetsViewModel() {
var self = this;
self.usersets = ko.observableArray([{SetId: 1, SetName: 'Name 1'}]);
self.getTemplate = function () {
return self.usersets().length > 0 ? "showSets" : "noSets";
}
}
$(document).ready(function () {
ko.applyBindings(new SetsViewModel(), document.getElementById('user_sets'));
});
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script type="text/html" id="noSets">
<p>You do not have items yet.</p>
</script>
<script type="text/html" id="showSets">
<div class="block">
<input data-bind="value: $data.SetId" />
<div class="txt">
<h3 data-bind="text: 'Set name:' + $data.SetName"></h3>
</div>
</div>
</script>
<div data-bind="template: { name: getTemplate, foreach: usersets }" id="user_sets">
</div>
&#13;
答案 1 :(得分:1)
我认为命名模板可能是针对此特定问题的错误方法 - 它们更适用于您希望每个项目使用不同模板的情况,这不是这里的情况。相反,当有0个项目时显示完全不同的div
会更合适:
<div data-bind="visible: usersets().length == 0">
You have no sets
</div>
<div data-bind="visible: usersets().length > 0, foreach: usersets" id="user_sets">
<div class="block">
<input type="hidden" data-bind="value: $data.SetId" />
<div class="fav" data-bind="css: { fullop: $data.IsFavorite == true }">
<img alt="" src="img/fav.png" data-bind="click: $root.setFavorite">
</div>
<div>
<img alt="" data-bind="attr: { src: $data.SetImg }">
</div>
<div class="txt">
<h3 data-bind="text: $data.SetName, click: $root.go"></h3>
<p><span data-bind="text: $data.ItemsNumber + ' вещей,'"></span><span data-bind=" text: ' общая цена ' + $data.SetPrice + ' руб'"></span></p>
</div>
</div>
</div>