Textarea maxlength检查

Question

Textarea验证,

如何限制a中的字符textarea不超过50个字符.

<textarea rows="5" cols="15"></textarea>

谢谢.....

Answer 1

使用:

<textarea rows="5" cols="15" maxlength="50"></textarea>

来自http://sigswitch.com/2008/07/textarea-maxlength-with-jquery/:

  $(document).ready(function(){
     $('textarea[maxlength]').keyup(function(){
      var max = parseInt($(this).attr(’maxlength’));
      if($(this).val().length > max){
       $(this).val($(this).val().substr(0, $(this).attr('maxlength')));
      }

      $(this).parent().find('.charsRemaining').html('You have ' + (max - $(this).val().length) + ' characters remaining');
     });
    });

Answer 2

一个谷歌远.

<script language="javascript" type="text/javascript">
<!--
function imposeMaxLength(Object, MaxLen)
{
  return (Object.value.length <= MaxLen);
}
-->
</script>

Implementation:
<textarea name="myName" onkeypress="return imposeMaxLength(this, 50);" ></textarea> 

编辑:

不冻结文本的代码:

<script type="text/javascript">

/***********************************************
* Textarea Maxlength script- © Dynamic Drive (www.dynamicdrive.com)
* This notice must stay intact for legal use.
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

function imposeMaxLength(obj){
var mlength=obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : ""
if (obj.getAttribute && obj.value.length>mlength){
  obj.value=obj.value.substring(0,mlength)
}

</script>

<textarea maxlength="40" onkeyup="return imposeMaxLength(this)"></textarea>

Answer 3

更简单的内联方法:

<textarea cols="60" rows="5" onkeypress="if (this.value.length > 100) { return false; }"></textarea>

将"100"更改为您想要的多个字符