我有一个 Knockout 自定义绑定(bind)处理程序,我想在其中调用 foreach 绑定(bind)功能,然后调用回调函数。当我尝试执行此操作时,我不断收到“ Uncaught Error :您不能将绑定(bind)多次应用于同一元素。”错误。
我的自定义绑定(bind)非常简单( typescript ):
/// <reference path="knockout.d.ts" />
ko.bindingHandlers["postForeach"] = {
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
if (!allBindingsAccessor().postForeachCallback)
throw "Callback not defined for postForeach binding!";
//call foreach init functionality
ko.bindingHandlers['foreach'].init(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
},
update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
//call foreach update functionality
ko.bindingHandlers['foreach'].update(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
//call callback
allBindingsAccessor().postForeachCallback();
}
};
在构建这个过程中我遗漏了什么吗?
谢谢!
编辑:
回调函数
self.populateMainContentWindow = function () {
var dataTable = $(this.tableId).dataTable();
dataTable.fnDestroy();
// create the datatable
var actualTable = this.jQuery(this.tableId);
if (actualTable.length == 0) {
return false;
}
// create the data table with options
var newDataTable = actualTable.dataTable(this.options);
// always set the width afterwards
actualTable.css("width", "100%");
};
数据绑定(bind)签名(在“with”绑定(bind)中):
postForeach: array, postForeachCallback: $parent.viewModel().populateMainContentWindow
最佳答案
Knockout 使用 init
的返回值来确定它是否应该处理元素的后代。您可以只返回 foreach.init
函数的值,也可以从您的 init
函数中专门返回 { controlsDescendantBindings: true }
:
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
if (!allBindingsAccessor().postForeachCallback)
throw "Callback not defined for postForeach binding!";
//call foreach init functionality
return ko.bindingHandlers['foreach'].init(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
},
引用:http://knockoutjs.com/documentation/custom-bindings-controlling-descendant-bindings.html
关于javascript - 链接 Knockout 自定义绑定(bind),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18796261/