如何在文本框中设置最大长度6和最小长度6? [英] How can I set the maximum length of 6 and minimum length of 6 in a textbox?

问题描述

考虑:

 <input id="groupidtext" type="text" style="width: 100px;" maxlength="6" /></td>

是否可以将最小长度设置为6?

Is there a way to set the minimum length to 6?

推荐答案

您可以使用JavaScript执行以下操作:

You could do it with JavaScript with something like this:

<input onblur="checkLength(this)" id="groupidtext" type="text" style="width: 100px;" maxlength="6" />
<!-- Or use event onkeyup instead if you want to check every character strike -->

function checkLength(el) {
  if (el.value.length != 6) {
    alert("length must be exactly 6 characters")
  }
}

请注意，这可以在不支持HTML 5的旧版浏览器中使用，但它依赖于已打开JavaScript的用户.

Note this would work in older browsers which don't support HTML 5, but it relies on the user having JavaScript switched on.

这篇关于如何在文本框中设置最大长度6和最小长度6?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！