如何使 HTML 输入标签只接受数值?-前端问题

How to make HTML input tag only accept numerical values?(如何使 HTML 输入标签只接受数值?)

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问题描述

我需要确保某个 <input> 字段仅将数字作为值.输入不是表单的一部分.因此它不会被提交，因此在提交期间进行验证不是一种选择.我希望用户不能输入除数字以外的任何字符.

有没有一种巧妙的方法来实现这一点?

解决方案

HTML 5

您可以使用 HTML5 输入类型编号仅限制数字条目:

这仅适用于 HTML5 投诉浏览器.确保您的 html 文档的 doctype 是:

<!DOCTYPE html>

另请参阅 https://github.com/jonstipe/number-polyfill 以获得透明支持在旧版浏览器中.

`JavaScript`

更新:有一个新的非常简单的解决方案:

<块引用>它允许您在文本 <input> 上使用 任何 类型的输入过滤器，包括各种数字过滤器.这将正确处理复制+粘贴、拖放、键盘快捷键、上下文菜单操作、不可键入的键和所有键盘布局.
请参阅此答案或自己尝试在 JSFiddle 上.
出于一般目的，您可以进行 JS 验证，如下所示:
function isNumberKey(evt){var charCode = (evt.which) ?evt.which : evt.keyCodeif (charCode > 31 && (charCode < 48 || charCode > 57))返回假；返回真；}<input name="someid" type="number" onkeypress="return isNumberKey(event)"/>
如果您想允许小数，请将if 条件"替换为:
if (charCode > 31 && (charCode != 46 &&(charCode < 48 || charCode > 57)))
来源:HTML文本输入只允许数字输入p>
JSFiddle 演示:http://jsfiddle.net/viralpatel/nSjy7/
I need to make sure that a certain <input> field only takes numbers as value.
The input is not part of a form. Hence it doesn't get submitted, so validating during submission is not an option. I want the user to be unable to type in any characters other than numbers.

Is there a neat way to achieve this?
 解决方案 
HTML 5

You can use HTML5 input type number to restrict only number entries:
<input type="number" name="someid" />
This will work only in HTML5 complaint browser. Make sure your html document's doctype is: 

<!DOCTYPE html>

See also https://github.com/jonstipe/number-polyfill for transparent support in older browsers.

JavaScript

Update: There is a new and very simple solution for this:

  It allows you to use any kind of input filter on a text <input>,
  including various numeric filters. This will correctly handle
  Copy+Paste, Drag+Drop, keyboard shortcuts, context menu operations,
  non-typeable keys, and all keyboard layouts.
See this answer or try it yourself on JSFiddle.

For general purpose, you can have JS validation as below:
function isNumberKey(evt){
    var charCode = (evt.which) ? evt.which : evt.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;
    return true;
}

<input name="someid" type="number" onkeypress="return isNumberKey(event)"/>
If you want to allow decimals replace the "if condition" with this:
if (charCode > 31 && (charCode != 46 &&(charCode < 48 || charCode > 57)))
Source: HTML text input allow only numeric input

JSFiddle demo: http://jsfiddle.net/viralpatel/nSjy7/

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问题描述

HTML 5

JavaScript

HTML 5

JavaScript

基础教程推荐

`JavaScript`