原型 - 获取表格单元格内的值 [英] Prototype - get value inside table cell

问题描述

我有以下代码段(Prototype):

$('table_cell_id')

那个单元格包含一个数字.我如何将这个数字放入 JavaScript 变量中?

That cell contains a number. How would I get this number into a JavaScript variable?

推荐答案

如果单元格只包含文本，应该这样做:

If the cell only contains text something like this should do:

var someNumber, stringData = $("table_cell_id").innerHTML.strip();  
if (stringData.length > 0) someNumber = Number(stringData);
if (isNaN(someNumber)) {
  alert("Error: someNumber is not a number");
}
else {
  alert(someNumber);
}

innerHTML 返回单元格的原始字符串数据.strip() 删除前导和尾随空格，Number(x) 将修剪后的字符串转换为数字.

innerHTML returns raw string data of the cell. strip() removes leading and trailing whitespaces and Number(x) casts the trimmed string to a number.

当然，如果单元格可能是空的，您就不需要检查了.另外，最好检查变量是否为 NaN(不是数字).

If the cell could be empty you wan't to check for that, of course. Also, it is good to check whether the variable is NaN (not a number).

这是一个应该有效的单行:

Here's a one-liner that should work:

var someNumber = Number($("table_cell_id").innerHTML.strip());

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