jquery判定文字入力個数(数字は英語で1、中国語で2、長さを超えると自動的に切り取る)

 
  
 
  
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  <br>//  val      
  <br>function getByteLen(val) { 
  <br>var len = 0; 
  <br>for (var i = 0; i < val.length; i++) { 
  <br>if (val[i].match(/[^\x00-\xff]/ig) != null) //   
  <br>len += 2; 
  <br>else 
  <br>len += 1; 
  <br>} 
  <br>return len; 
  <br>} 
  <br>//  val       max    
  <br>function getByteVal(val, max) { 
  <br>var returnValue = ''; 
  <br>var byteValLen = 0; 
  <br>for (var i = 0; i < val.length; i++) { 
  <br>if (val[i].match(/[^\x00-\xff]/ig) != null) 
  <br>byteValLen += 2; 
  <br>else 
  <br>byteValLen += 1; 
  <br>if (byteValLen > max) 
  <br>break; 
  <br>returnValue += val[i]; 
  <br>} 
  <br>return returnValue; 
  <br>} 
  <br>$(function() { 
  <br>var _area = $('textarea#txtPrizeNote'); 
  <br>var _info = _area.next(); 
  <br>var _max = _area.attr('maxlength'); 
  <br>var _val; 
  <br>_area.bind('keyup change', function() { //  keyup change   
  <br>if (_info.find('span').size() < 1) {//                 
  <br>_info.append(_max); 
  <br>} 
  <br>_val = $(this).val(); 
  <br>_cur = getByteLen(_val); 
  <br>if (_cur == 0) {//       0 ,       maxlength  
  <br>_info.text(_max); 
  <br>} else if (_cur < _max) {//          ,     max-cur 
  <br>_info.text(_max - _cur); 
  <br>} else {//             
  <br>_info.text(0); 
  <br>$(this).val(getByteVal(_val,_max)); //            
  <br>} 
  <br>}); 
  <br>}); 
  <br>