Question

我正在尝试创建一个自定义绑定处理程序，以便对页面上的字段应用基于角色的访问。在自定义处理程序中，它将从viewModel检查其他observable的值，并根据条件启用或禁用输入控件。

但是我无法通过bindingContext获取当前的ViewModel。$ parent，$ root，$ data或$ rawData。当我在IE上调试它只显示{...}

问题仅发生在IE上，它在google crome上运行正常。有人可以帮助我如何通过bindingContext获取当前的ViewModel。

＆＃13;

var divForm = document.getElementById('divform');

function AuditFormViewModel() {
    self = this;
    self.Name = ko.observable("Kiran");
    self.Email = ko.observable("kiranparab0@gmail.com");
    self.Complete = ko.observable(true);
    self.Send = ko.observable(false);
    
    self.conditionArray = [
            { Field: "Name", condition: [{ Property: "Complete", Value: true }, { Property: "Send", Value: true }] },
            { Field: "Email", condition: [{ Property: "Complete", Value: false }] }
        ];
    }

    ko.bindingHandlers.hasAccess = {
        update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
            
                        
            var field = valueAccessor();
            var accessConditions = [];
            accessConditions = bindingContext.$data.conditionArray;

            var condition = accessConditions.filter(function (cnd) {
                return cnd.Field === field
            })[0].condition;

            var value = true;
            for (var i = 0; i < condition.length; i++) {
                
                var cndProp = condition[i].Property;
                var cndVal = bindingContext.$data[cndProp]();

                value = value && (condition[i].Value === cndVal);
            }
            ko.bindingHandlers.enable.update(element, function () { return value });
        }
    };

auditFormViewModel = new AuditFormViewModel();
ko.applyBindings(auditFormViewModel, divForm);

＆＃13;

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.1.0/knockout-min.js"></script>
<div id="divform">
    Name : <input type="text" data-bind="value:Name, hasAccess:'Name'" />
    <br />
    Email : <input type="text" data-bind="value:Email, hasAccess:'Email'" />
</div>

＆＃13;

以下是fiddle

Answer 1

在我的代码中，我没有将self声明为var，它只是换线。＆＃39; var self = this＆＃39;相反＆＃39; self = this＆＃39;

knockout绑定处理程序 - 未定义的bindingContext。$ IE9上的数据

1 个答案: