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

问题描述

 < input id =groupidtexttype =textstyle =width：100px; maxlength =6/>< / td> 
  

有没有办法让最小长度为6？
<你可以用javascipt来做到这一点：

 < input onblur =checkLength（this）id =groupidtexttype =textstyle =width：100px; maxlength =6/> 
 <！ - 或者使用事件onkeyup，而不是想要检查每个字符罢工 - > 
 
 
函数checkLength（el）{
 if（el.value.length！= 6）{
 alert（length must be 6 characters）
 
 
 b 
 
 
 
 
请注意，这种方法适用于不支持旧版本的浏览器HTML 5，但依赖于开启了javascript的用户。  
 <input id="groupidtext" type="text" style="width: 100px;" maxlength="6" /></td>
Is there any way to get the minimum length to 6?
解决方案
you could do it with javascipt 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")
  }
}
Note this would work in older browsers which don't support HTML 5, but relies on the user having javascript switched on. 

                        
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