如何限制HTML输入框只接受数字输入？-html教程-PHP中文网

如何限制HTML输入框只接受数字输入？

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发布： 2023-09-01 13:37:02

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如何限制html输入框只接受数字输入？

在本文中，我们将学习如何限制HTML输入框，使其仅接受数字输入。

We use the <input type="number"> to limit an HTML input box so that it only accepts numeric inputs. By using this, we will get a numeric input field.

Syntax

以下是限制HTML输入框只接受数字输入的语法。

<input type="number">

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Example

以下是一个示例程序，用于限制HTML输入框只接受数字输入 -

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<!DOCTYPE html>
<html>
<center>
<head>
   <meta charset="UTF-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <style>
      input[type=number] {
         width: 10%;
         padding: 12px 20px;
         margin: 8px 0;
         box-sizing: border-box;
         border: 2px solid mediumseagreen;
         border-radius: 4px;
      }
   </style>
</head>
<body>
   <h1>Tutorialspoint</h1>
   <form action = "" method = "get">
      Enter your Mobile number -
      <input type="number"> <br><br>
      Enter your area Pincode -
      <input type="number"> <br><br>
      <input type="submit" value="Submit">
   </form>
</body>
</center>
</html>

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如果我们尝试输入除数字以外的任何值，它将不允许。因此，它严格只允许数字值。

Example

Following is another example program to limit an HTML input box so that it only accepts numeric input -

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<!DOCTYPE html>
<html>
<head>
   <meta charset="UTF-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
   <form action = "" method = "get">
      Phone Number:
      <input type="number" name="num" min="1" max="20"><br>
      <input type="submit" value="Submit">
   </form>
</body>
</html>

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After limiting the input box to number, if a user enters text and press submit button, then the following can be seen “Please enter a number.”

We can also limit the value of the number input field.

在将输入框限制为数字后，如果用户输入的值大于限制值并点击提交按钮，那么将会显示以下内容：“值必须小于或等于指定的限制值（20）”

Example

Following is another example program to limit an HTML input box so that it only accepts numeric input -

<!DOCTYPE html>
<html>
<head>
   <meta charset="UTF-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
   <form action = "" method = "get">
      <h3>Select the quantity, and we cannot deliver more than 5.</h3><br>
      Pizza<input type="number" name="num" min="0" max="5"><br>
      Burger<input type="number" name="num" min="0" max="5"><br>
      Garlic Bread<input type="number" name="num" min="0" max="5"><br>
      Pepsi<input type="number" name="num" min="0" max="5"><br>
   </form>
</body>
</html>

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如果您编译并运行上述代码，它将显示4个方框，您可以将限制设置为从最小值0到最大值5。

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