我正在尝试我的第一个自定义绑定在淘汰赛,但似乎无法让它工作。我从http://knockoutjs.com/documentation/custom-bindings.html得到了这个样本。
脚本
ko.bindingHandlers.slideVisible = {
update: function (element, valueAccessor, allBindings) {
debugger;
// First get the latest data that we're bound to
var value = valueAccessor();
// Next, whether or not the supplied model property is observable, get its current value
var valueUnwrapped = ko.unwrap(value);
// Grab some more data from another binding property
var duration = allBindings.get('slideDuration') || 400; // 400ms is default duration unless otherwise specified
// Now manipulate the DOM element
if (valueUnwrapped == true) $(element).slideDown(duration); // Make the element visible
else $(element).slideUp(duration); // Make the element invisible
}
};
HTML
<div data-bind="slideVisible: giftWrap, slideDuration:600">You have selected the option</div>
<label>
<input type="checkbox" data-bind="checked: giftWrap" />Gift wrap</label>
<script type="text/javascript">
var viewModel = {
giftWrap: ko.observable(true)
};
ko.applyBindings(viewModel);
</script>
jsfiddle链接:http://jsfiddle.net/dingen2010/2gpL6/1/
答案 0 :(得分:1)
它在这里工作,http://jsfiddle.net/YkeeB/(使用相同的代码) - 但它也使用Knockout v3.0(这是Knockout网站上的文档中的示例正在使用)
ko.bindingHandlers.slideVisible = {
update: function (element, valueAccessor, allBindings) {
// First get the latest data that we're bound to
var value = valueAccessor();
// Next, whether or not the supplied model property is observable, get its current value
var valueUnwrapped = ko.unwrap(value);
// Grab some more data from another binding property
var duration = allBindings.get('slideDuration') || 400; // 400ms is default duration unless otherwise specified
// Now manipulate the DOM element
if (valueUnwrapped == true) $(element).slideDown(duration); // Make the element visible
else $(element).slideUp(duration); // Make the element invisible
}
};
var viewModel = {
giftWrap: ko.observable(true)
};
ko.applyBindings(viewModel);
对于Knockout v2.3.0及更低版本,没有方法ko.unwrap
。相反,您必须使用ko.utils.unwrapObservable
。这是一个小提琴,它适用于v2.2.1,http://jsfiddle.net/yt4Gs/1/。
此外,仅供将来参考使用JSFiddle时,不要将脚本放在HTML部分中 - 即使它位于<script>
标记内。放入JavaScript部分。