php-在循环语句中选中全部/取消选中所有复选框

我的程序有问题.这是我的代码段.

这是Javascript / Jquery代码.

<script language='javascript'>

///SELECTING CHECKBoxES////
$(function(){

// add multiple select / deselect functionality
$("#selectall").click(function () {
      $('.case').attr('checked', this.checked);
});

// if all checkBox are selected, check the selectall checkBox
// and viceversa
$(".case").click(function(){

    if($(".case").length == $(".case:checked").length) {
        $("#selectall").attr("checked", "checked");
    } else {
        $("#selectall").removeAttr("checked");
    }

});
});
</script>

这是我将集成该javascript的代码.

 <h2>Quotation ID</h2>
            <?PHP

        $select_orders = MysqL_query ("SELECT * FROM tblorder WHERE project_id = '$project_id' GROUP BY quotation_id") OR DIE (MysqL_error());
        while ($row2=MysqL_fetch_array($select_orders)){
            $quote_id = $row2['quotation_id'];


            ?>
        <h3 class="expand"><?PHP echo $quote_id; ?></h3>
        <div class="collapse">
            <table align='center' border='1' class='display'>
                <thead>
                    <th><input type='checkBox' onclick='checkall()' id='selectall'/></th>
                    <th>Product Type</th>
                    <th width='20px'>Product type code</th>
                    <th width='20px'>Quantity</th>
                    <th>Width</th>
                    <th>Height</th>
                    <th>Total Sub.</th>
                </thead>
                <tbody>
                <?PHP
                $tots_tots = 0;
                $tots_subs = 0;
                $select_orders2 = MysqL_query ("SELECT * FROM tblorder WHERE project_id = '$project_id' AND quotation_id = '$quote_id'") OR DIE (MysqL_error());
                    while ($row3=MysqL_fetch_array($select_orders2)){
                        $idd = $row3['id'];
                        $project_id2 = $row3['project_id'];
                        $order_id = $row3['quotation_id'];
                        $prod_type = $row3['prod_type'];
                        $prod_type_code = $row3['prod_type_code'];
                        $qty = $row3['qty'];
                        $width = $row3['width'];
                        $height = $row3['height'];
                        $tot_sub = $row3['total_subs'];

                        $tots_subs += $tot_sub;

                echo "<tr bgcolor='".$colors[$c++ % 2]."' align='center'>";
                    echo "<td>
                    <input type='hidden' name='project_name' value='$project_name'>
                    <input type='checkBox' name='check_ptc[]' value='$prod_type_code' style='display:none;' checked>
                    <input type='checkBox' class='case' name='checkBox[]' value='".$idd."'></td>";
                    echo "
                            <input type='hidden' name='project_id[]' value='$project_id2'>
                        </td>";
                    echo "<td>".$prod_type."
                            <input type='hidden' name='quotation_id[]' value='$order_id'>
                            <input type='hidden' name='prod_type[]' value='$prod_type'>
                        </td>";
                    echo "<td>".$prod_type_code."
                            <input type='hidden' name='prod_type_code[]' value='$prod_type_code'>
                        </td>";
                    echo "<td>".$qty."</td>";
                    echo "<td>".$width."</td>";
                    echo "<td>".$height."</td>";
                    echo "<td>".$tot_sub."</td>";
                echo "</tr>";
                }
                echo "<tr>";
                echo "<td></td><td></td><td></td><td></td><td></td>
                        <td>
                            <strong><b>Total:</b></strong>";
                echo "</td>";
                echo "<td>
                            <font color='#900'><u><b>$tots_subs</b></u></font>
                        </td>";

                echo "</tr>";
                ?>
                </tbody>
            </table>
        </div>
        <?PHP 
        }
        ?>

由于表在循环中.问题是何时出现第一个表格.并点击第一个标题复选框,它将选中其他表中的所有复选框.我不想发生.我正在寻找的一种方法是,是否有一种方法也可以迭代复选框的ID及其类.或有其他方法可以完成我想发生的事情.

如你看到的.那3张桌子有自己的复选框标题,我想在那里检查所有里面的桌子.你怎么会是聪明的主意.

提前致谢..

解决方法:

您可以这样做.

$('.allcb').on('click', function(){
    var childClass = $(this).attr('data-child');
    $('.'+childClass+'').prop('checked', this.checked);
});

FIDDLE

更新

只需将类allcb应用于主复选框,并将子类应用于名为chk的类.这应该适合您的需求.这是更新的
FIDDLE