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如何在 javascript 计算后的表单输入中摆脱弹出窗口“请选择一个有效值。两个最接近的有效值是

我有一个非常简单的表格,它询问一个物品容器的价格,然后还输入另一个容器中物品的数量。javascript 简单地将单个项目的总数除以价格以获得“每单位”成本。该脚本有效,但每次我运行它时,它都会在价格输入框中弹出一个通知“请选择一个有效值。两个最接近的有效值是...”,因为价格输入是小数。


如果我在 HTML 中编辑价格的输入行并添加“step="0.01",那么脚本不会输出任何内容。


奇怪的是,我在输出框中添加了“step="any"",它起作用了,因为我在输出框中也得到了相同的弹出窗口。我绝对想要单位成本输出中的大小数位。


这是 HTML(它使用 CSS Grid 设置样式,所以一切都按照我想要的方式定位):


<html>

<head>

<meta charset="utf-8" />

<link rel="stylesheet" href="style.css">

<title>Unit Cost Calculator</title>

</head>

<body>

<div class="contain">

  <div class="wrapper">

    <div class="form">

      <h2>Unit Cost Calculator</h3>


      <form id="unitCost" action="">

        <p>

          <label for="itemdesc">Item Description</label>

          <input id="itemdesc" name="itemdesc" type="text" />

        </p>

        <p>

          <label for="price">Price</label>

          <input id="price" name="price" type="number" />

        </p>

        <p>

          <label for="quantity">Qty.</label>

          <input id="quantity" name="quantity" type="number" />

        </p>

        <p>

          <label for="unit">Unit Cost</label>

          <input id="unit" name="unit" type="number" step="any" />

        </p>

        <p>

          <label for="singleUnitCost">Single Unit Cost</label>

          <input id="singleUnitCost" name="singleUnitCost" type="number" />

        </p>

        <p>

        </p>

        <p>

        </p>

        <p>

        </p>

        <p>

          <label for="subm"></label>

          <input type="submit" value="Calculate Per Unit Cost" onclick="units()" />

        </p>

        <p>

          <label for="rest"></label>

          <input type="reset" value="Reset" />

        </p>

      </form>

    </div>

  </div>

</div>


另外,在脚本中,我想将价格乘以 0.06(这是 6% 的销售税率),再将价格加回去,这样我实际上得到的是加税后的价格,但是当我这样做时“myResult”代码行的数学运算如下:


var myResult=(pric*0.06+pric)/qty;

然后脚本根本不起作用。


啊。我很快就学会了 javascript 数学和形式令人沮丧。


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慕桂英4014372

我认为主要错误是您试图将values 直接用作数字。如果将它们设置为实际数字,一切都会按预期进行。通常,您希望价格保留两位小数:function units() {&nbsp; &nbsp;var pric=Number(document.getElementById('price').value);&nbsp; &nbsp;var qty=Number(document.getElementById('quantity').value);&nbsp; &nbsp;var result=document.getElementById('unit');&nbsp; debugger;&nbsp; &nbsp;var myResult=(pric*0.06+pric)/qty;&nbsp; &nbsp; &nbsp;document.getElementById('unit').value=myResult;}<div class="contain">&nbsp; <div class="wrapper">&nbsp; &nbsp; <div class="form">&nbsp; &nbsp; &nbsp; <h2>Unit Cost Calculator</h3>&nbsp; &nbsp; &nbsp; <form id="unitCost" action="javascript:void(0);">&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <label for="itemdesc">Item Description</label>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input id="itemdesc" name="itemdesc" type="text" />&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <label for="price">Price</label>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input id="price" name="price" type="number" step="0.01"/>&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <label for="quantity">Qty.</label>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input id="quantity" name="quantity" type="number" />&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <label for="unit">Unit Cost</label>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input id="unit" name="unit" type="number" step="any" />&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <label for="singleUnitCost">Single Unit Cost</label>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input id="singleUnitCost" name="singleUnitCost" type="number" />&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <label for="subm"></label>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input type="submit" value="Calculate Per Unit Cost" onclick="units()" />&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; &nbsp; <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <label for="rest"></label>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input type="reset" value="Reset" />&nbsp; &nbsp; &nbsp; &nbsp; </p>&nbsp; &nbsp; &nbsp; </form>&nbsp; &nbsp; </div>&nbsp; </div></div>主要的变化是pric和qty在Number函数内部。另外,请注意表格的action是javascript:void(0);这样的,因此不会发送任何内容。您需要在您的示例中将其改回。
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