jQuery选择当前TR的第二个和第三个单元格

jquery select second and third cell of current tr

本文关键字：单元格 三个 选择 TR 第二个 jQuery      更新时间：2023-09-26

我是jquery的新手。下面是我在内容页面中的 html 表格。在母版页中，我还有其他表。 当我通过拖动从"表约会"中选择表单元格时。它选择页面中的所有表格单元格。用户限制只能选择当前tr的第二个和第三个单元格.如果用户选择超过三行，则发出警报（"时间段不超过45分钟。我怎样才能用jquery做到这一点。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Drag selection example</title>
    <script type="text/javascript" src="http://www.google.com/jsapi"></script>
    <script type="text/javascript">
        google.load("jquery", "1.3.2");
        google.setOnLoadCallback(function ()
        {
            var active = false;
            $('#tableAppointment tr td:nth-child(2), #tableAppointment tr td:nth-child(3)').mousedown(function (ev)
            {
                active = true;
                $(".csstdhighlight").removeClass("csstdhighlight"); // clear previous selection
                ev.preventDefault(); // this prevents text selection from happening
                $(this).addClass("csstdhighlight");
                $(this).addClass("temp_selected");
            });
            $('#tableAppointment tr td:nth-child(2), #tableAppointment tr td:nth-child(3)').mousemove(function (ev)
            {
                if (active)
                {
                    $(this).addClass("csstdhighlight");
                    $(this).addClass("temp_selected");
                }
                if ($('.temp_selected').length > 6)
                {
                    alert("Time slot not more than 45 minutes.")
                    return false;
                }
            });
            $(document).mouseup(function (ev)
            {
                active = false;
                $('.temp_selected').removeClass('.temp_selected');
            });
        });
    </script>
    <style type="text/css">
        .csstdhighlight
        {
            background-color: #ccffcc;
        }
    </style>
</head>
<body>
    <table id="tableAppointment" cellspacing="1" width="50%" border="1" align="center">
        <tr>
            <td bgcolor="#ffffff">
            </td>
            <td class="csstablelisttd">
            </td>
            <td class="csstablelisttd">
                <b>Patient Name</b>
            </td>
        </tr>
        <tr>
            <td class="csstablelisttd" valign="top" width="70px">
                8:00AM
            </td>
            <td class="csstablelisttd">
                0
            </td>
            <td class="csstablelisttd">
            </td>
        </tr>
        <tr>
            <td class="csstablelisttd">
            </td>
            <td class="csstablelisttd">
                15
            </td>
            <td class="csstablelisttd">
            </td>
        </tr>
        <tr>
            <td class="csstablelisttd">
            </td>
            <td class="csstablelisttd">
                30
            </td>
            <td class="csstablelisttd">
            </td>
        </tr>
        <tr>
            <td class="csstablelisttd">
            </td>
            <td class="csstablelisttd">
                45
            </td>
            <td class="csstablelisttd">
            </td>
        </tr>
        <tr>
            <td class="csstablelisttd" valign="top" width="90px">
                9:00AM
            </td>
            <td class="csstablelisttd">
                0
            </td>
            <td class="csstablelisttd">
            </td>
        </tr>
        <tr>
            <td class="csstablelisttd">
            </td>
            <td class="csstablelisttd">
                15
            </td>
            <td class="csstablelisttd">
            </td>
        </tr>
        <tr>
            <td class="csstablelisttd">
            </td>
            <td class="csstablelisttd">
                30
            </td>
            <td class="csstablelisttd">
            </td>
        </tr>
        <tr>
            <td class="csstablelisttd">
            </td>
            <td class="csstablelisttd">
                45
            </td>
            <td class="csstablelisttd">
            </td>
        </tr>
    </table>    
</body>
</html>

尝试使用$('#tableAppointment tr td:nth-child(2)')

对于alert("time slot not more than 45 minutes.") 

<script type="text/javascript">
        google.load("jquery", "1.3.2");
        google.setOnLoadCallback(function ()
        {
            var active = false;

            $("#tableAppointment tr td:nth-child(2), #tableAppointment tr td:nth-child(3)").mousedown(function (ev)
            {
                ev.preventDefault(); // this prevents text selection from happening
                if(get_num_rows() > 3)
                { 
                    alert("time slot not more than 45 minutes");
                    return false; 
                }
                active = true;
                num_rows_selected = num_rows_selected + 1;
                $(".csstdhighlight").removeClass("csstdhighlight"); 
                $(this).addClass("csstdhighlight");
            });
            $("td").mousemove(function (ev)
            {
                if (active)
                {
                    $(this).addClass("csstdhighlight");
                }
            });
            function get_num_rows() {
                var count = 0;
                $("#tableAppointment tr").each(function(){
                    if($(this).find('td.csstdhighlight').length > 0)
                    {
                      count++;
                    }
                });
                return count;
            }
            $(document).mouseup(function (ev)
            {
                active = false;
            });
        });
    </script>

这样的事情怎么样？

$("td").mousemove(function (ev) {
    if (active){
        $(this).addClass("csstdhighlight");
    }
    if($('.csstdhighlight').length > 2){
        alert("time slot not more than 45 minutes.")
    }
});

因此，如果有超过 2 个元素包含 csstdhighlight 类。然后它会提醒错误。

第二次尝试：

$("#tableAppointment td").mousedown(function (ev)
        {
            active = true;
            $(".csstdhighlight").removeClass("csstdhighlight"); // clear previous selection
            ev.preventDefault(); // this prevents text selection from happening
            $(this).addClass("csstdhighlight");
            $(this).addClass("temp_selected");
        });
        $("td").mousemove(function (ev)
        {
            if (active)
            {
                $(this).addClass("csstdhighlight");
                $(this).addClass("temp_selected");
            }
            if($('.temp_selected').length > 2){
                alert("time slot not more than 45 minutes.")
            }
        });
        $(document).mouseup(function (ev)
        {
            active = false;
            $('.temp_selected').removeClass('temp_selected');
        });
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