将javascript变量值传递给输入类型的隐藏值 [英] Pass a javascript variable value into input type hidden value

问题描述

我想将两个整数的乘积值分配到已经在html文档中的隐藏字段。
我正在考虑获取javascript变量的值，然后将其传递给隐藏的输入类型。
我很难解释，但这是应该如何工作的：

脚本示例

I would like to assign value of product of two integer numbers into a hidden field already in the html document. I was thinking about getting the value of a javascript variable and then passing it on a input type hidden. I'm having a hard time to explain but this is how it should work:

 <script type="text/javascript">
 function product(a,b){
      return a*b;
 }
 </script>

计算产品，我希望产品处于隐藏字段。

above computes the product and i want the product to be in hidden field.

<input type="hidden" value="[return value from product function]">

这怎么可能？

How is this possible?

推荐答案

您可以为您的隐藏字段添加一个id：

You could give your hidden field an id:

<input type="hidden" id="myField" value="" />

然后当您想要分配其值时：

and then when you want to assign its value:

document.getElementById('myField').value = product(2, 3);

确保在DOM完全加载后执行此分配，例如在 window.load 事件。

Make sure that you are performing this assignment after the DOM has been fully loaded, for example in the window.load event.

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