防止项目在其他(父/子)元素中“可放置" [英] Prevent items to be 'droppable' in other (parent/child) elements

问题描述

我使用knockout-sortable.js 让用户拖放项目给它们一个不同的顺序，但是当我的页面上有多个放置区域"时我遇到了问题.我有嵌套集，所有这些都是可排序的，但不可可互换.

我的代码:

 
<tr><td>Blabla</td></tr>

在其他时候:

 
<tr><td>另一个blabla</td></tr>

我现在可以将Another blabla"拖放到Blabla"中，从而导致错误.我怎样才能防止这种情况发生?

解决方案

有几种方法可以解决这个问题.第一种是将 connectClass 作为 false 或 null(或任何表示为布尔值时等于 false 的值)传递给可淘汰排序的 connectClass:

<div class="sortable" data-bind="sortable: { data: blueprint.pages, connectClass: false }"><tr><td>Blabla</td></tr>

<div class="sortable" data-bind="sortable: { data: selectedPage().page_sections, connectClass: false }"><tr><td>另一个blabla</td></tr>

您还可以将包含选项传递给 jQuery:

<div class="sortable" data-bind="sortable: { data: blueprint.pages, options: { contains: 'parent' } }"><tr><td>Blabla</td></tr>

<div class="sortable" data-bind="sortable: { data: selectedPage().page_sections, options: { contains: 'parent' } }"><tr><td>另一个blabla</td></tr>

与第一个解决方案不同，这将阻止项目从视觉上离开盒子(如果这是您的愿望).

I use knockout-sortable.js to let the user drag and drop items to give them a different order, but I'm experiencing problems when I have multiple 'drop zones' on my page. I have nested sets, all of which are sortable, but not interchangeable.

My code:

    <div class="sortable" data-bind="sortable: blueprint.pages">
          <tr><td>Blabla</td></tr>
    </div>

And at some other point:

    <div class="sortable" data-bind="sortable: selectedPage().page_sections">
          <tr><td>Another blabla</td></tr>
    </div>

I can now just drag and drop 'Another blabla' into 'Blabla', causing errors. How can I prevent this from happening?

解决方案

There are a couple ways to go about this. The first is to pass in to knockout-sortable the connectClass as false or null (or anything that is equal to false when expressed as a boolean):

<div class="sortable" data-bind="sortable: { data: blueprint.pages, connectClass: false }">
    <tr><td>Blabla</td></tr>
</div>

<div class="sortable" data-bind="sortable: { data: selectedPage().page_sections, connectClass: false }">
      <tr><td>Another blabla</td></tr>
</div>

You can also pass, into jQuery, the containment option:

<div class="sortable" data-bind="sortable: { data: blueprint.pages, options: { containment: 'parent' } }">
    <tr><td>Blabla</td></tr>
</div>

<div class="sortable" data-bind="sortable: { data: selectedPage().page_sections, options: { containment: 'parent' } }">
      <tr><td>Another blabla</td></tr>
</div>

This, unlike the first solution, will stop the item from visually leaving the box (if that's your desire).

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