根据类对表列的所有值求和 [英] sum all values for table column based on class

问题描述

我正在尝试根据特定的类检索td中所有值的总和.该代码不会引发任何错误，但是我的总和一直导致结果为"0".

I'm trying to retrieve the sum of all values in a td based on a specific class. The code does not throw up any errors but my sum keeps resulting in "0".

是否必须以特定方式指定数值?在这里，我从模仿代码的地方看到了其他一些答案，我看不到我和他们之间的任何真正区别，因此我对为什么我的作品不起作用感到困惑.

Do the numerical values have to be specified in a particular way? I saw some other answers here on SO from where have imitated the code, and i dont see any real difference between mine and theirs so im confused as to why mine isnt working.

以下是我供参考的教程: http: //viralpatel.net/blogs/2009/07/sum-html-textbox-values-using-jquery-javascript.html

Here is a tutorial i followed for reference: http://viralpatel.net/blogs/2009/07/sum-html-textbox-values-using-jquery-javascript.html

这是我的JavaScript

Here is my javascript

$(document).ready(function(){
$('.price').each(function() {
    calculateSum();
});
});

 function calculateSum() {

var sum = 0;
//iterate through each td based on class and add the values
    $(".price").each(function() {

        //add only if the value is number
        if(!isNaN(this.value) && this.value.length!=0) {
            sum += parseFloat(this.value);
        }

    });
$('#result').text(sum);    
};

这是我的html

<table border="1">
<tr>
<th>Item</th>
<th>Price</th>
</tr>
<tr>
<td>Banana</td>
<td class ="price">50</td>
</tr>
<tr>
 <td>Apple</td>
 <td class ="price">100</td>
</tr>
</table>

<div id="result"></div>

推荐答案

您要使用 text() 代替this.value(因为<td>没有值"):

You want to use text() instead of this.value (since <td>s don't have a "value"):

var sum = 0;
// iterate through each td based on class and add the values
$(".price").each(function() {

    var value = $(this).text();
    // add only if the value is number
    if(!isNaN(value) && value.length != 0) {
        sum += parseFloat(value);
    }
});

此外，您还要遍历.price元素(调用calculateSum)多次.您可以替换

Also, you're looping over your .price elements (calling calculateSum) multiple times. You can replace

$(document).ready(function(){
    $('.price').each(function() {
        calculateSum();
    });
});

使用

$(calculateSum);

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