编辑功能在敲除js中不起作用 [英] edit functionality is not working in knockout js

问题描述

我刚刚使用net.net上的示例创建了一个可编辑的对象，当我尝试编辑网格时，它没有显示值，而是将输入字段显示为空白.有什么帮助吗? 在编辑中，我正在调用此功能

I just created an editable using an example available on net.in this when i am trying to edit the grid then it doesn't show the value it shows the input field blank.can any body help ? in edit i am calling this function

  self.editFruit = function (fruit) {
        if (self.editingItem() == null) {
            // start the transaction
            fruit.beginEdit(self.editTransaction);

            // shows the edit fields
            self.editingItem(fruit);
        }
    };

这是小提琴 jsfiddle

推荐答案

在第一次评估绑定时，每个水果的可观察值(data-bind="value: name.editValue")的editValue子可观察值都不存在.当您单击编辑"链接时，将创建可观察到的editValue，但敲除并不知道必须重新绑定.

At the time the binding is evaluated for the first time the editValue child observable of each of fruit's observables ( data-bind="value: name.editValue" ) doesn't exist. When you click on the "edit" link the editValue observable is created but knockout doesn't know that it has to rebind.

您可以解决这两种方法.

You can solve this 2 ways.

1.在每个输入周围创建一个虚拟的if绑定.如果if变为true，则内容将重新插入到DOM中，从而导致绑定重新评估.在设置了editItem observable之前，请确保将editValue observable附加到其父项上，否则情况相同

1 . Create a virtual if binding around each input. When the if becomes true, the content will be reinserted back into the DOM causing the bindings to re-evaluate. Make sure that editValue observable is attached to its parent BEFORE editingItem observable is set, otherwise you are in the same situation

<!-- ko if: $root.isItemEditing($data) -->
<input data-bind="..."></input>
<!-- /ko -->

2.在绑定模型之前，请确保所有可观察对象的父对象可观察对象都具有editValue可观察对象，并在beginEdit fn中设置了editValue可观察对象的值.

2 . Make sure that all observables have the editValue observable attached to the parent observable before the model is bound, the set editValue observable's value in the beginEdit fn.

function Fruit(data) {
  var self = this;
  self.name = ko.observable(data.name || "");
  self.name.editValue = ko.observable();

  self.rate = ko.observable(data.rate || "");
  self.rate.editValue = ko.observable();
}

ko.observable.fn.beginEdit = function (transaction) {
  ...

  if (self.slice)
    self.editValue(self.slice());
  else
    self.editValue(self());

  ...
}

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