Javascript 可以在敲除中创建自定义if绑定
我想创建一个“fadeInIf”自定义绑定。我的想法相当于《时尚》中的“流行”: 我对自定义绑定非常陌生,但我认为它可能是这样的:Javascript 可以在敲除中创建自定义if绑定,javascript,knockout.js,Javascript,Knockout.js,我想创建一个“fadeInIf”自定义绑定。我的想法相当于《时尚》中的“流行”: 我对自定义绑定非常陌生,但我认为它可能是这样的: ko.bindingHandlers.fadeInIf = { init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) { var value = valueAccessor(); $(element).to
ko.bindingHandlers.fadeInIf = {
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var value = valueAccessor();
$(element).toggle(ko.utils.unwrapObservable(value));
ko.bindingHandlers.if.init(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
},
update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var value = valueAccessor();
if (ko.utils.unwrapObservable(value))
$(element).fadeIn();
ko.bindingHandlers.if.update(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
}
};
我已经让“fadeVisible”工作了,但无法解决这个问题,我缺少了什么?我想你在99%的时候做对了,但是第一次之后就不会进行淡入。。。我认为这与“if”绑定处理程序的工作方式有关。我所做的就是改变这一点:
if (ko.utils.unwrapObservable(value))
$(element).fadeIn();
为此:
if (ko.utils.unwrapObservable(value)) {
$(element).toggle(false);
$(element).fadeIn();
}
如果您想查看的话,我已经保存了一部分工作状态。谢谢您的建议。 我终于让它工作了,我失去了选择。结果如下:
ko.bindingHandlers.fadeIf = {
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var value = valueAccessor();
$(element).toggle(ko.utils.unwrapObservable(value));
ko.bindingHandlers['if'].init(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
return { controlsDescendantBindings: value };
},
update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var value = valueAccessor();
if (ko.utils.unwrapObservable(value)) {
ko.bindingHandlers['if'].update(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
$(element).fadeIn();
}
else {
$(element).fadeOut(200, function () {
ko.bindingHandlers['if'].update(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
});
}
}
};
ko.bindingHandlers.fadeIf = {
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var value = valueAccessor();
$(element).toggle(ko.utils.unwrapObservable(value));
ko.bindingHandlers['if'].init(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
return { controlsDescendantBindings: value };
},
update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var value = valueAccessor();
if (ko.utils.unwrapObservable(value)) {
ko.bindingHandlers['if'].update(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
$(element).fadeIn();
}
else {
$(element).fadeOut(200, function () {
ko.bindingHandlers['if'].update(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
});
}
}
};