如何得到最后一列的总和和平均值。在我的代码中，如果表有一行，两行和三行，它将不会得到正确的值。这只适用于有4行的表。我知道我的错代码，但我无法弄清楚循环如何在.each函数。
重要说明：这与keyup事件一起运行以更新表数据。它不仅仅是一个显示器。确切地说，它是一个更新表单。
所需的输出
Item | value1 | value 2 | value3 |value 4 | Average
01 90 88 87 80 82.25
Total average 82.25 result of 82.25/1 number of row
if two rows
Item | value1 | value 2 | value3 |value 4 | Average
01 90 88 87 80 82.25
02 80 85 86 84 83.75
Total average 83 result of (82.25+83.75)/2 number of rows
但结果出现了多个循环
Here is the console.log(totalAverage)
86.25
176
264.75
353.5
442.25
86.25
176
264.75
353.5
442.25
问题：如何抑制或跳过这些不必要的值。我只需要86.25来显示总数。注意：这只是现在的单行并且已经发生了这种错误，如果表有多个多少则多少那么行？
HTML
<tr>
<th colspan="12"><h4>Card</h4></th>
</tr>
<tr>
<th colspan="3">Subjects</th>
<th colspan="2">First Grading</th>
<th colspan="2">Second Grading</th>
<th colspan="2">Third Grading</th>
<th colspan="2">Fourth Grading</th>
<th>Average</th>
</tr>
</thead>
<tbody>
@foreach($update_card['AllGrade'] as $subject)
{!! Form::hidden('grade_id[]',$subject['grade_id']) !!}
<tr>
<th colspan="3">{!! $subject->subject !!}</th>
<td colspan="2">{!! Form::text('term_1[]',$subject->term_1,['class'=>'form-control','name[]'=>'term_1','id[]'=>'term_1','value'=>'0']) !!}</td>
<td colspan="2">{!! Form::text('term_2[]',$subject->term_2,['class'=>'form-control','name[]'=>'term_2','id[]'=>'term_2','value'=>'0']) !!}</td>
<td colspan="2">{!! Form::text('term_3[]',$subject->term_3,['class'=>'form-control','name[]'=>'term_3','id[]'=>'term_4','value'=>'0']) !!}</td>
<td colspan="2">{!! Form::text('term_4[]',$subject->term_4,['class'=>'form-control','name[]'=>'term_4','id[]'=>'term_4','value'=>'0']) !!}</td>
<td colspan="2" class="average" id="average" value="0"> Average</td>
</tr>
@endforeach
<tr>
<th colspan="11">Total Average:</th>
<th>{!! Form::text('scholar_GPA',$update_card->scholar_GPA,['class'=>'form-control total-ave','name' => 'total-ave','id' => 'total-ave','value' => '0']) !!}</th>
</tr>
Javascript代码段
$("input").on("keyup", function(){
$("tbody tr").each(function() {
var col=1;
var tr =1;
var t = 0;
var a = 0;
$(this).children('td').not(':last').each(function () {
var number = ($(this).children('input').length == 0) ? $(this).html() : $(this).children('input').first().val();
// console.log(number);
// console.log(col);
t += parseInt(number);
// console.log(t);
a = t/col;
col++;
});
$(this).children('td').last().html(a);//last td of the row
// console.log(a);
col=1;
tr++;
});
calcTotalave();
});
// calculate total average
function calcTotalave() {
var totalAve = 0;
var tot=0;
var c = 2;
var count =0;
$( ".average" ).each(function() {
// console.log($(this).html());
var thisAve = parseFloat($(this).html());
if(!thisAve || thisAve === NaN || thisAve == "") {
thisAve = 0;
}
totalAve += thisAve;
//alert('count'+thisAve+totalAve);
console.log(totalAve);
count++;
});
c++;
totalAve = totalAve/c;
// console.log(totalAve);
$("#total-ave").val(totalAve);
}
答案 0 :(得分：0)
更新：在下面添加评论，按空格键运行，基于以下功能。
小提琴是循环遍历并按行计算单元格，因此不需要.average类。您需要根据数据库输出调整html表格布局。
calcTotalave();
});
// calculate total average
function calcTotalave() {
var totalAve = 0;
$( ".average" ).each(function() {
var thisAve = parseFloat($(this).text()) || 0; // always return a number
totalAve += thisAve;
});
var Aver = totalAve / $('.average').length;
console.log(totalAve);
$("#total-ave").text(Aver);
}
而不是将每个单元格分类为.average，您可以使用选择器定位给定行的所有单元格td：
$('input').change(function() {
calTotalAverages(); // the magic and collect the total average
});
function calTotalAverages(){
var SumAve = 0, nums = 0; // to collect total averages and the number of rows
$('tr').each(function(i) {
if (i > 0) { // ignore the first row
var $this = $(this);
SumAve += calcRowAve($this); // add up the returned averages and run the function
nums ++; // count the rows
}
}); // cycle through each row
var sum = (SumAve / nums);
$('#total-ave').text(sum.toFixed(2)); // display the total average
return sum; // return the total average
}
// calculate total average
function calcRowAve(targetRow) {
var totalAve = 0,
targetCells = targetRow.children(),
targLength = targetCells.length - 2; // total number of values in a row
targetCells.each(function(i) {
if (i > 0 && i <= targLength) {
var thisAve = parseFloat($('input',this).val()) || parseFloat($(this).text()) || 0; // always return a number
totalAve += thisAve;
} // check to ignore the first cell and the last
});
var Aver = totalAve / targLength; // get the average
targetCells.last().text(Aver); // update the last cell of the row
return Aver; // return the average for this row
}#total-ave {
position: fixed;
right: 2em;
top: 8em;
}
input{
width: 5em;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tr>
<th>item 1</th>
<th>value 1</th>
<th>value 2</th>
<th>value 3</th>
<th>value 4</th>
<th>average</th>
</tr>
<tr>
<td>1</td>
<td>90</td>
<td>88</td>
<td>87</td>
<td>80</td>
<td></td>
</tr>
<tr>
<td>2</td>
<td>80</td>
<td>85</td>
<td>86</td>
<td>84</td>
<td></td>
</tr>
<tr>
<td>3</td>
<td><input type='number'></td>
<td><input type='number'></td>
<td><input type='number'></td>
<td><input type='number'></td>
<td></td>
</tr>
</table>
<div id='total-ave'></div>