敲除嵌套排序 sourceParent.splice 不是函数

Question

这里我正在处理使用 Knockout sortable 的代码。它应该显示 3 层以上的嵌套排序。

数据传给了模板，但有些元素return被拖放到原来的位置（例如最上层的A，B元素）。

nested sortable应该怎么配置才能让最上层也能正常使用不报错？

错误：

knockout-sortable.js:244 Uncaught TypeError: sourceParent.splice is not a function

or

knockout-sortable.js:252 Uncaught TypeError: targetParent.splice is not a function

JSFiddle - Similar working example

var viewModel = function() {
  var self = this;
  self.children = ko.observable([{
    "name": "A",
    "children": [{
      "name": "A1",
      "children": [{
        "name": "A11"
      }, {
        "name": "A12"
      }]
    }, {
      "name": "A2"
    }]
  }, {
    "name": "B",
    "children": [{
      "name": "B1"
    }, {
      "name": "B2"
    }]
  }]);
}
ko.applyBindings(new viewModel());

ul {
  border: solid 1px green;
  list-style-type: none;
  margin:0px;
}
li {
  padding: 10px;
  border: solid 1px blue;
  margin:0px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="https://rawgithub.com/rniemeyer/knockout-sortable/master/build/knockout-sortable.js"></script>

<script id="nodeTmpl" type="text/html">
  <li>
    <!-- ko if: $data.name -->
    <a href="#" data-bind="text: $data.name"></a>
    <!-- /ko -->
    <!-- ko if: $data.children -->
    <ul data-bind="sortable: { template: 'nodeTmpl', data: $data.children }"></ul>
    <!-- /ko -->
  </li>
</script>

<ul data-bind="sortable: { template: 'nodeTmpl', data: $root.children }"></ul>

Answer 1

问题已通过更改行 <ul data-bind="template: { name: 'nodeTmpl', data: $root }"></ul> 解决，我从一些参考中删除了 $data，因为它导致了错误。

var viewModel = function() {
    var self = this;
    self.children = [{
    "name": "A",
    "children": [{
      "name": "A1",
      "children": [{
        "name": "A11",
      }, {
        "name": "A12",
      }]
    }, {
      "name": "A2",
    }]
  }, {
    "name": "B",
    "children": [{
      "name": "B1",
    }, {
      "name": "B2",
    }]
  }]
};
ko.applyBindings(new viewModel());

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/2.2.1/knockout-min.js"></script>
<script src="https://rawgithub.com/rniemeyer/knockout-sortable/master/build/knockout-sortable.js"></script>

<script id="nodeTmpl" type="text/html">
  <li>
    <!-- ko if: $data.name -->
    <a href="#" data-bind="text: name"></a>
    <!-- /ko -->
    <!-- ko if: $data.children -->
    <ul data-bind="sortable: { template: 'nodeTmpl', data: children }"></ul>
    <!-- /ko -->
  </li>
</script>

<ul data-bind="template: { name: 'nodeTmpl', data: $root }"></ul>

Answer 2

Peter Gerhat提供的解决方案不正确。问题是 observable of an array was used, rather than an observableArray.

错误表明 sourceParent（从中拖动元素的视图模型上的集合）没有 splice 函数。这是正确的，可观察对象没有 splice 函数，而 array 或 observableArray 有。这同样适用于 targetParent（这是元素被拖动到的视图模型上的集合）。

要使初始示例正常工作，只需将 observable 更改为 observableArray。

但是，正如您将在 Peter Gerhat 提供的原始示例和解决方案中注意到的那样，即使没有抛出错误，它仍然无法正常工作。您会注意到，当您拖动元素时，它们要么根本不动，要么消失。

这里的解决方案是将每个 array 变成一个 observableArray，这样它们就可以通过 sortable-binding 进行更新。

var viewModel = function() {
  var self = this;
  self.children = ko.observableArray([{
    "name": "A",
    "children": ko.observableArray([{
      "name": "A1",
      "children": ko.observableArray([{
        "name": "A11"
      }, {
        "name": "A12"
      }])
    }, {
      "name": "A2"
    }])
  }, {
    "name": "B",
    "children": ko.observableArray([{
      "name": "B1"
    }, {
      "name": "B2"
    }])
  }]);
}
ko.applyBindings(new viewModel());

ul {
  border: solid 1px green;
  list-style-type: none;
  margin: 0px;
}

li {
  padding: 10px;
  border: solid 1px blue;
  margin: 0px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="https://rawgithub.com/rniemeyer/knockout-sortable/master/build/knockout-sortable.js"></script>

<script id="nodeTmpl" type="text/html">
  <li>
    <!-- ko if: $data.name -->
    <a href="#" data-bind="text: $data.name"></a>
    <!-- /ko -->
    <!-- ko if: $data.children -->
    <ul data-bind="sortable: { template: 'nodeTmpl', data: $data.children }"></ul>
    <!-- /ko -->
  </li>
</script>

<ul data-bind="sortable: { template: 'nodeTmpl', data: $root.children }"></ul>

敲除嵌套排序 sourceParent.splice 不是函数

Knockout nested sortable sourceParent.splice is not a function

knockout-2.0

knockout.js

knockout-sortable

knockout-templating

knockout-3.0