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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