限制表单输入文本字段中允许的字符数 [英] Limit number of characters allowed in form input text field

问题描述

如何限制或限制用户在文本框中最多输入5个字符？

How do I limit or restrict the user to only enter a maximum of five characters in the textbox?

以下是输入字段作为我的表单的一部分：

/ p>

Below is the input field as part of my form:

<input type="text" id="sessionNo" name="sessionNum" />

是否使用类似maxSize或类似的东西？

Is it using something like maxSize or something like that?

推荐答案

maxlength ：

maxlength:

将被接受为输入的字符的最大数量。这可以通过SIZE指定的更大，在这种情况下，
字段将适当滚动。

The maximum number of characters that will be accepted as input. This can be greater that specified by SIZE , in which case the field will scroll appropriately. The default is unlimited.

<input type="text" maxlength="2" id="sessionNo" name="sessionNum" onkeypress="return isNumberKey(event)" />

但是，这可能会或可能不会受到您的处理程序的影响。您可能需要使用或添加其他处理函数来测试其长度。

However, this may or may not be affected by your handler. You may need to use or add another handler function to test for length, as well.

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