仅正整数的 HTML 输入(类型=数字) [英] HTML input for Positive Whole Numbers Only (Type=number)

问题描述

我找不到合适的正则表达式模式，尽管这类问题有很多.

I can't find the right regex pattern for this, even though there are a lot of questions in this kind.

我不希望用户能够输入或输入

I dont want the user to be able to type or input

<td><input type="number" pattern=" 0+.[0-9]*[1-9][0-9]*$" name="itemConsumption" /></td>

1. -1.0(负值)
2. 字符串值和任何字符
3. 1.0(十进制值)
4. 无范围限制

我只想接受正整数

已解决不需要正则表达式，我不知道这一点:D

SOLVED no need for regex, I did not know this :D

<td><input type="number" pattern=" 0+.[0-9]*[1-9][0-9]*$" name="itemConsumption" onkeypress="return event.charCode >= 48 && event.charCode <= 57"</td> 

推荐答案

要禁止除数字以外的任何输入，您可以使用

To disallow any input but numeric, you may use

<input type="text" onkeypress="return (event.charCode == 8 || event.charCode == 0 || event.charCode == 13) ? null : event.charCode >= 48 && event.charCode <= 57" name="itemConsumption" />
                   ^------------....

<form id="mfrm">
<table>
    <tr>
        <td>Enter number only: <input type="text" name="itemConsumption" onkeypress="return (event.charCode == 8 || event.charCode == 0 || event.charCode == 13) ? null : event.charCode >= 48 && event.charCode <= 57" /></td>
        <td><input type="Submit"/></td>
    </tr>
</table>

这里，event.charCode == 8 ||event.charCode == 0 ||event.charCode == 13 条件处理按下 DELETE、BACKSPACE 或 ENTER 键的情况(对 Firefox 很重要，请参阅 Mohit 的评论 下面和datashaman 的评论与启用 ENTER 键有关).

Here, the event.charCode == 8 || event.charCode == 0 || event.charCode == 13 condition handles the case when DELETE, BACKSPACE or ENTER keys are pressed (important for Firefox, see Mohit's comment below and datashaman's comment related to enabling the ENTER key).

event.charCode >= 48 &&event.charCode <= 57 表示只返回 0(十进制代码 48)和所有其他直到 9(十进制代码 57)的数字.

The event.charCode >= 48 && event.charCode <= 57 means that only 0 (decimal code 48) and all other digits up to 9 (decimal code 57) will be returned.

这篇关于仅正整数的 HTML 输入(类型=数字)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！