jQuery treetable：获取所有节点的第一个和最后一个子节点

Question

我有一个 TreeTable Api http://ludo.cubicphuse.nl/jquery-treetable/#usage，用于在 Html 表中显示来自 MySql 的数据。

我想要做的是 jQuery 中的 OnDocumentReady 我需要禁用一些按钮。

这是我的表格结构，每行有 2 个按钮上移和下移。

为了改变 tr 的顺序，我创建了它们。我的问题是如何获得每个节点的第一个孩子和最后一个孩子，以便我可以禁用第一个孩子的上移按钮并禁用最后一个孩子的下移按钮。如果节点没有兄弟节点，则禁用这两个按钮。

到目前为止，我已经尝试过了，但对我没有帮助

$('tr td:last-child').each(function(){
    var $this = $(this).contents(".md");
    $this.prop( "disabled", true );
});
$('tr td:last-child').each(function(){
        var $this = $(this).contents(".mu");
        $this.prop( "disabled", true );
});

.md(moveDown) 和 .mu(moveUp) 是用于稍后单击时执行某些数据库任务的按钮的类。

这是我正在处理上述表格结构的 HTML PHP 代码

<?php
include 'dbconn.php';
    $conn = mysql_connect($dbhost, $dbuser, $dbpass);
    mysql_connect('localhost','root','root');
    mysql_select_db('cms');
    //select all rows from the main_menu table
    $result = mysql_query("select id, label as title, parent as parentid,link,status from pages order by seq asc");
    //create a multidimensional array to hold a list of menu and parent menu
    $menu = array(
        'menus' => array(),
        'parent_menus' => array(),
    );
    //build the array lists with data from the menu table
    while ($row = mysql_fetch_assoc($result)) {
        //creates entry into menus array with current menu id ie. $menus['menus'][1]
        $menu['menus'][$row['id']] = $row;
        //creates entry into parent_menus array. parent_menus array contains a list of all menus with children
        $menu['parent_menus'][$row['parentid']][] = $row['id'];
    }
    // Create the main function to build milti-level menu. It is a recursive function.  
    echo $html='<table class="test2 table  table-bordered">
                <tr>
                    <th>Page Name</th>
                    <th> Status </th><th> Edit </th><th> Add Submenu </th><th><!--Delete Menu--></th><th> Sequence </th>
                </tr>
                <tr data-tt-id="0">
                    <td class="Root">Root</td>
                    <td>
                    </td>
                    <td>
                    </td>
                    <td><button class="btn btn-info" onclick="addMenu(0,0)" data-toggle="modal" data-target="#addmenu">
                        <span  class="glyphicon glyphicon-plus-sign"></span>Add</button></td>
                    <td>
                    </td>
                </tr>';
    function buildMenu($parent, $menu) {
    $char=" ";
    if (isset($menu['parent_menus'][$parent])) {
foreach ($menu['parent_menus'][$parent] as $menu_id) {
            //echo "id:".$menu['menus'][$menu_id]['id']."par:".$menu['menus'][$menu_id]['parentid'];
              if($menu['menus'][$menu_id]['status']=='active')
              {
                  $class="btn-success";
                  $span="glyphicon glyphicon-ok-sign";
                  $set="";
              }
              else if($menu['menus'][$menu_id]['status']=='deactive')
                      {
                          $class="btn-danger";
                          $span="glyphicon glyphicon-remove-sign";
                          $set="disabled='disabled'";
                      }
                      else
                          {
                              $class="btn-info";

                          }
            if (!isset($menu['parent_menus'][$menu_id])) {

                $html .= '<tr data-tt-id="'.$menu['menus'][$menu_id]['id'].'" data-tt-parent-id="'.$menu['menus'][$menu_id]['parentid'].'">
                <td class="Root">'.$menu['menus'][$menu_id]['title'].'</td>
                <td><button style="width:6em;" id="'.$menu['menus'][$menu_id]['id'].'" class="btn '.$class.'" 
                onclick="status('."'".$menu['menus'][$menu_id]['id']."'".",".
                "'".$menu['menus'][$menu_id]['parentid']."'".","."'".$menu['menus'][$menu_id]['status']."'".')">
                <span  class="'.$span.'"></span>'.$menu['menus'][$menu_id]['status'].'</button>
                </td>

                <td><button id="'.$menu['menus'][$menu_id]['title'].'" class="btn btn-warning setting dbbutton"  onclick="edit('.$menu['menus'][$menu_id]['id'].','.$menu['menus'][$menu_id]['parentid'].')" '.$set.'>
                <span  class="glyphicon glyphicon-edit"></span>Edit</button>
                </td>

                <td><button class="btn btn-info" onclick="addMenu('.$menu['menus'][$menu_id]['id'].','.$menu['menus'][$menu_id]['parentid'].')" 
                    data-toggle="modal" data-target="#addmenu">
                <span  class="glyphicon glyphicon-plus-sign"></span>Add</button>
                </td>

                <td><!--<button class="btn btn-danger" onclick="deleteMenu('.$menu['menus'][$menu_id]['id'].','.$menu['menus'][$menu_id]['parentid'].')">
                <span  class="glyphicon glyphicon-trash"></span>Delete</button>--></td>             


                <td>    
                    <button id="'.$menu['menus'][$menu_id]['id'].'" class="btn btn-default btn-xs mu" onclick="moveUp(this)" style="color:orange !important;" title="Move Up">
                        <span class="glyphicon glyphicon-triangle-top" ></span>
                    </button>
                    <button id="'.$menu['menus'][$menu_id]['id'].'" class="btn btn-default btn-xs md" onclick="moveDown(this)" style="color:orange !important" title="Move Down">
                        <span class="glyphicon glyphicon-triangle-bottom"></span>
                    </button>
                </td>
                </tr>'
                ;
            }
            if (isset($menu['parent_menus'][$menu_id])) {
                $html .= "<tr data-tt-id='".$menu['menus'][$menu_id]['id']."' data-tt-parent-id='".$menu['menus'][$menu_id]['parentid']."'>
                            <td class='Root'>".$menu['menus'][$menu_id]['title'];
                $html .= '</td>
                <td><button style="width:6em;" id="'.$menu['menus'][$menu_id]['id'].'" class="btn '.$class.'" onclick="status('."'".$menu['menus'][$menu_id]['id']."'".",".
                "'".$menu['menus'][$menu_id]['parentid']."'".","."'".$menu['menus'][$menu_id]['status']."'".')">
                <span  class="'.$span.'"></span>'.$menu['menus'][$menu_id]['status'].'</button>
                </td>

                <td><button id="'.$menu['menus'][$menu_id]['title'].'"class="btn btn-warning setting dbbutton"  onclick="edit('.$menu['menus'][$menu_id]['id'].','.$menu['menus'][$menu_id]['parentid'].')" '.$set.'>
                <span  class="glyphicon glyphicon-edit"></span>Edit</button>
                </td>

                <td><button class="btn btn-info" onclick="addMenu('.$menu['menus'][$menu_id]['id'].','.$menu['menus'][$menu_id]['parentid'].')" data-toggle="modal" data-target="#addmenu">
                <span  class="glyphicon glyphicon-plus-sign"></span>Add</button>
                </td>

                <td><!--<button class="btn btn-danger" onclick="deleteMenu('.$menu['menus'][$menu_id]['id'].','.$menu['menus'][$menu_id]['parentid'].')">
                <span  class="glyphicon glyphicon-trash"></span>Delete</button>--></td>

                <td>    
                    <button id="'.$menu['menus'][$menu_id]['id'].'" class="btn btn-default btn-xs mu" onclick="moveUp(this)" style="color:orange !important;" title="Move Up">
                        <span class="glyphicon glyphicon-triangle-top" ></span>
                    </button>
                    <button id="'.$menu['menus'][$menu_id]['id'].'" class="btn btn-default btn-xs md" onclick="moveDown(this)" style="color:orange !important" title="Move Down">
                        <span class="glyphicon glyphicon-triangle-bottom"></span>
                    </button>
                </td>


                ';
                $html .= buildMenu($menu_id, $menu);
                //$html .= "</td>";
                $html .= "</tr>";
            }
        }
    }
    return $html;
}

echo buildMenu(0, $menu);

echo "</table>";
?>

Answer 1

您需要使用.find() 而不是.contents() 在td 中查找类.md 的元素。你也不需要使用.each()，你直接将属性设置为所有：

$('tr td .md:last-child').prop( "disabled", true );