Javascript 排序功能无法正常运行

Question

我正在开展一项调查并发送给客户。其中一个问题要求客户将他们的偏好从 1 到 7 进行排序。我已经完成了 html，这就是它的样子。

<div class="row">
        <!--begin-->
        <div class="q1 col-xs-offset-3 col-xs-10">
            <p class="question">2) What benefits are most important to you? (Please rank 1-7)</p>
            <ol>
                <li id="q2-node-1" class="selection"><b>Option 1</b>
                    <input type="hidden" value="Option 1" name="q2">
           <span class="dropdown pull-right">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  Move To <i class="caret"></i>
              </a>
             <ul class="dropdown-menu">
                 <li><a href="#1" data-to="1" data-move="#q2-node-1">Priority 1</a></li>
                 <li><a href="#2" data-to="2" data-move="#q2-node-1">Priority 2</a></li>
                 <li><a href="#3" data-to="3" data-move="#q2-node-1">Priority 3</a></li>
                 <li><a href="#4" data-to="4" data-move="#q2-node-1">Priority 4</a></li>
                 <li><a href="#5" data-to="5" data-move="#q2-node-1">Priority 5</a></li>
                 <li><a href="#6" data-to="6" data-move="#q2-node-1">Priority 6</a></li>
                 <li><a href="#7" data-to="7" data-move="#q2-node-1">Priority 7</a></li>
             </ul>
                 </span>
                </li>
                <li id="q2-node-2" class="selection"><b>Option 2</b>
                    <input type="hidden" value="Option 2" name="q2">
           <span class="dropdown pull-right">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  Move To <i class="caret"></i>
              </a>
             <ul class="dropdown-menu">
                 <li><a href="#1" data-to="1" data-move="#q2-node-2">Priority 1</a></li>
                 <li><a href="#2" data-to="2" data-move="#q2-node-2">Priority 2</a></li>
                 <li><a href="#3" data-to="3" data-move="#q2-node-2">Priority 3</a></li>
                 <li><a href="#4" data-to="4" data-move="#q2-node-2">Priority 4</a></li>
                 <li><a href="#5" data-to="5" data-move="#q2-node-2">Priority 5</a></li>
                 <li><a href="#6" data-to="6" data-move="#q2-node-2">Priority 6</a></li>
                 <li><a href="#7" data-to="7" data-move="#q2-node-2">Priority 7</a></li>
             </ul>
                 </span>
                </li>
                <li id="q2-node-3" class="selection"><b>Option 3</b>
                    <input type="hidden" value="Option 3" name="q2">
           <span class="dropdown pull-right">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  Move To <i class="caret"></i>
              </a>
             <ul class="dropdown-menu">
                 <li><a href="#1" data-to="1" data-move="#q2-node-3">Priority 1</a></li>
                 <li><a href="#2" data-to="2" data-move="#q2-node-3">Priority 2</a></li>
                 <li><a href="#3" data-to="3" data-move="#q2-node-3">Priority 3</a></li>
                 <li><a href="#4" data-to="4" data-move="#q2-node-3">Priority 4</a></li>
                 <li><a href="#5" data-to="5" data-move="#q2-node-3">Priority 5</a></li>
                 <li><a href="#6" data-to="6" data-move="#q2-node-3">Priority 6</a></li>
                 <li><a href="#7" data-to="7" data-move="#q2-node-3">Priority 7</a></li>
             </ul>
                 </span>
                </li>
                <li id="q2-node-4" class="selection"><b>Option 4</b>
                    <input type="hidden" value="Option 4" name="q2">
           <span class="dropdown pull-right">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  Move To <i class="caret"></i>
              </a>
             <ul class="dropdown-menu">
                 <li><a href="#1" data-to="1" data-move="#q2-node-4">Priority 1</a></li>
                 <li><a href="#2" data-to="2" data-move="#q2-node-4">Priority 2</a></li>
                 <li><a href="#3" data-to="3" data-move="#q2-node-4">Priority 3</a></li>
                 <li><a href="#4" data-to="4" data-move="#q2-node-4">Priority 4</a></li>
                 <li><a href="#5" data-to="5" data-move="#q2-node-4">Priority 5</a></li>
                 <li><a href="#6" data-to="6" data-move="#q2-node-4">Priority 6</a></li>
                 <li><a href="#7" data-to="7" data-move="#q2-node-4">Priority 7</a></li>
             </ul>
                 </span>
                </li>
                <li id="q2-node-5" class="selection"><b>Option 5</b>
                    <input type="hidden" value="Option 5" name="q2">
           <span class="dropdown pull-right">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  Move To <i class="caret"></i>
              </a>
             <ul class="dropdown-menu">
                 <li><a href="#1" data-to="1" data-move="#q2-node-5">Priority 1</a></li>
                 <li><a href="#2" data-to="2" data-move="#q2-node-5">Priority 2</a></li>
                 <li><a href="#3" data-to="3" data-move="#q2-node-5">Priority 3</a></li>
                 <li><a href="#4" data-to="4" data-move="#q2-node-5">Priority 4</a></li>
                 <li><a href="#5" data-to="5" data-move="#q2-node-5">Priority 5</a></li>
                 <li><a href="#6" data-to="6" data-move="#q2-node-5">Priority 6</a></li>
                 <li><a href="#7" data-to="7" data-move="#q2-node-5">Priority 7</a></li>
             </ul>
                 </span>
                </li>
                <li id="q2-node-6" class="selection"><b>Option 6</b>
                    <input type="hidden" value="Option 6" name="q2">
           <span class="dropdown pull-right">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  Move To <i class="caret"></i>
              </a>
             <ul class="dropdown-menu">
                 <li><a href="#1" data-to="1" data-move="#q2-node-6">Priority 1</a></li>
                 <li><a href="#2" data-to="2" data-move="#q2-node-6">Priority 2</a></li>
                 <li><a href="#3" data-to="3" data-move="#q2-node-6">Priority 3</a></li>
                 <li><a href="#4" data-to="4" data-move="#q2-node-6">Priority 4</a></li>
                 <li><a href="#5" data-to="5" data-move="#q2-node-6">Priority 5</a></li>
                 <li><a href="#6" data-to="6" data-move="#q2-node-6">Priority 6</a></li>
                 <li><a href="#7" data-to="7" data-move="#q2-node-6">Priority 7</a></li>
             </ul>
                 </span>
                </li>
                <li id="q2-node-7" class="selection"><b>Option 7</b>
                    <input type="hidden" value="Option 7" name="q2">
           <span class="dropdown pull-right">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  Move To <i class="caret"></i>
              </a>
             <ul class="dropdown-menu">
                 <li><a href="#1" data-to="1" data-move="#q2-node-7">Priority 1</a></li>
                 <li><a href="#2" data-to="2" data-move="#q2-node-7">Priority 2</a></li>
                 <li><a href="#3" data-to="3" data-move="#q2-node-7">Priority 3</a></li>
                 <li><a href="#4" data-to="4" data-move="#q2-node-7">Priority 4</a></li>
                 <li><a href="#5" data-to="5" data-move="#q2-node-7">Priority 5</a></li>
                 <li><a href="#6" data-to="6" data-move="#q2-node-7">Priority 6</a></li>
                 <li><a href="#7" data-to="7" data-move="#q2-node-7">Priority 7</a></li>
             </ul>
                 </span>
                </li>
            </ol>
        </div>
    </div>

这个问题的想法是，左侧将显示供他们排序的选项。右侧将显示一个下 zipper 接，其中列出了优先级 1-7。客户将选择他们希望选项出现的位置，并且选项将移动到该位置。我正在使用 Javascript 来完成这项工作。我让它在大部分情况下都能工作，这是代码。

$(function () {
// helper function to change jQuery's array data to something uniform.
function formToJSON(data) {
    var index = {};

    $.map(data, function (n, i) {
        if (!index.hasOwnProperty(n['name'])) index[n['name']] = [];
        index[n['name']].push(n["value"])
    });

    return index
}

$("[data-move]").bind("click tap", function (e) {
    e.preventDefault(); // stop <a> from changing the page
    var $tar = $($(this).data("move")); // moving this <li>
    var $position = parseInt($(this).data("to")); // position to move to;
    var list = $tar.parent("ol").children("li"); // all <li> in parent <ol>
    var $subject = list[$position-1]; // the <li> we are placing it above

    $tar.fadeOut(600, function(){
        if ($position >= list.length) {
            // there is nothing to insert before so
            // insert at the bottom of the list
            $tar.insertAfter(list[list.length-1]);
        }
            $tar.insertBefore($subject) // insert this <li> before the position

        $tar.fadeIn(1000);
    });
});

// catch form submit to show serialization of sort order
$("form").bind("submit", function (e) {
    e.preventDefault(); // stop <form> from submitting
    var data = $(this).serializeArray(); // get form data as an array
    console.log("submitting", formToJSON(data))
});

它大部分工作正常。我遇到的问题是，当我在其中任何一个上选择优先级 3 时，它会移动到选项 2 而不是选项 3。它对除 1 和 7 之外的所有选项都会这样做。如果选择优先级 1，它会移动到选项1 正如它应该的那样。同样，如果选择优先级 7，它将按照预期移动到选项 7。但所有其他选项都先于它实际应该移动到的选项移动到该选项。

Answer 1

因为您使用 insertbefore，所以当您按“优先级 3”时，它会将其插入到列表中的第三个索引之前。 本质上，当在优先级中向下移动某些内容时，您需要使用 insertafter；当在列表中向上移动时，您需要使用 insertbefore

希望这有帮助:)