jQuery中列的总和

Question

以下代码无效.正如你在jsfiddle上看到的那样,我需要按列加总.出了什么问题？

HTML

<table id="sum_table" width="300" border="1">
    <tr>
        <td>Apple</td>
        <td>Orange</td>
        <td>Watermelon</td>
    </tr>
    <tr>
        <td class="rowDataSd">1</td>
        <td class="rowDataSd">2</td>
        <td class="rowDataSd">3</td>
    </tr>
    <tr>
        <td class="rowDataSd">1</td>
        <td class="rowDataSd">2</td>
        <td class="rowDataSd">3</td>
    </tr>
    <tr>
        <td class="rowDataSd">1</td>
        <td class="rowDataSd">2</td>
        <td class="rowDataSd">3</td>
    </tr>
    <tr class="totalColumn">
        <td class="totalCol">Total:</td>
        <td class="totalCol">Total:</td>
        <td class="totalCol">Total:</td>
    </tr>
</table>

使用Javascript

$(document).ready(function(){


   $(".rowDataSd").each(function() {
      newSum.call(this);
    });

});


function newSum() {
    var $table = $(this).closest('table');
    var total = 0;

    $(this).attr('class').match(/(\d+)/)[1];

$table.find('tr:not(.totalColumn) .rowDataSd').each(function()  {
        total += parseInt($(this).html());

});

$table.find('.totalColumn td:nth-child('')').html(total);
}

Answer 1

这是一个jsffile.希望这可以帮助

  <table id="sum_table" width="300" border="1">
        <tr class="titlerow">
            <td>Apple</td>
            <td>Orange</td>
            <td>Watermelon</td>
        </tr>
        <tr>
            <td class="rowDataSd">1</td>
            <td class="rowDataSd">2</td>
            <td class="rowDataSd">3</td>
        </tr>
        <tr>
            <td class="rowDataSd">1</td>
            <td class="rowDataSd">2</td>
            <td class="rowDataSd">3</td>
        </tr>
        <tr>
            <td class="rowDataSd">1</td>
            <td class="rowDataSd">5</td>
            <td class="rowDataSd">3</td>
        </tr>
        <tr class="totalColumn">
            <td class="totalCol">Total:</td>
            <td class="totalCol">Total:</td>
            <td class="totalCol">Total:</td>
        </tr>
    </table> 
<script>
       var totals=[0,0,0];
        $(document).ready(function(){

            var $dataRows=$("#sum_table tr:not('.totalColumn, .titlerow')");

            $dataRows.each(function() {
                $(this).find('.rowDataSd').each(function(i){        
                    totals[i]+=parseInt( $(this).html());
                });
            });
            $("#sum_table td.totalCol").each(function(i){  
                $(this).html("total:"+totals[i]);
            });

        });
</script>

Answer 2

jsFiddle with example

为实现这一目标,我们可以充分利用元素中的thead和tfoot标签table.稍作修改,我们有以下内容:

HTML

<table id="sum_table" width="300" border="1">
    <thead>                
        <tr>
            <th>Apple</th>
            <th>Orange</th>
            <th>Watermelon</th>
        </tr>
    </thead>
    <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
    </tr>
    <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
    </tr>
    <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
    </tr>
    <tfoot>
        <tr>
            <td>Total:</td>
            <td>Total:</td>
            <td>Total:</td>
        </tr>
    </tfoot>
</table>???????????????

这样就可以让我们更具体地定位我们想要的元素,即有多少列,以及什么是"总"单元格.

JavaScript的

$(document).ready(function()
{
    $('table thead th').each(function(i)
    {
        calculateColumn(i);
    });
});

function calculateColumn(index)
{
    var total = 0;
    $('table tr').each(function()
    {
        var value = parseInt($('td', this).eq(index).text());
        if (!isNaN(value))
        {
            total += value;
        }
    });

    $('table tfoot td').eq(index).text('Total: ' + total);
}?

Answer 3

$('#sum_table tr:first td').each(function(){
   var $td = $(this); 

    var colTotal = 0;
    $('#sum_table tr:not(:first,.totalColumn)').each(function(){
        colTotal  += parseInt($(this).children().eq($td.index()).html(),10);
    });

    $('#sum_table tr.totalColumn').children().eq($td.index()).html('Total: ' + colTotal);
});

实例:http://jsfiddle.net/unKDk/7/