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[JavaScript] ÀÚ¹Ù½ºÅ©¸³Æ® :: ¹®ÀÚ¿­ ±ÛÀÚ¼ö ÀÚ¸£±â (¹®ÀÚ¸Þ¼¼Áöµîµî¿¡¼­ »ç¿ë)
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// JavaScript Document


// ±ÛÀÚ¼ö , Æû °´Ã¼ À̸§ , input type name À» ³Ö¾îÁÖ¼¼¿ä
//textlimit
//<span id="textlimit">0</span>/60 ÀÚ ±ÛÀÚ¼ö¸¦ Âï¾îÁÝ´Ï´Ù
function updateChar(length_limit, formObject,seq)
{
var comment='';
comment = eval("document."+formObject+"."+seq);
var form = eval("document."+formObject);

var length = calculate_msglen(comment.value);
textlimit.innerText = length;
if (length > length_limit) {
  alert("ÃÖ´ë " + length_limit + "byteÀ̹ǷΠÃÊ°úµÈ ±ÛÀÚ¼ö´Â ÀÚµ¿À¸·Î »èÁ¦µË´Ï´Ù.");
   comment.value = comment.value.replace(/\r\n$/, "");
  comment.value = assert_msglen(comment.value, length_limit);

}
}

//±ÛÀÚ¼ö¹Ýȯ
function calculate_msglen(message)
{
var nbytes = 0;

for (i=0; i<message.length; i++) {
  var ch = message.charAt(i);
  //alert("escape="+escape(ch.length)+"["+ch.length+"]");
  
  if(escape(ch).length > 4) {
   nbytes += 2;
  } else if (ch == '\n') {
   if (message.charAt(i-1) != '\r') {
    nbytes += 1;
   }
  } else if (ch == '<' || ch == '>') {
   nbytes += 4;
  } else {
   nbytes += 1;
  }
}

return nbytes;
}
//±ÛÀÚ¼ö Max±îÁö´Ù½Ã À߶󳻱â
function assert_msglen(message, maximum)
{
var inc = 0;
var nbytes = 0;
var msg = "";
var msglen = message.length;

for (i=0; i<msglen; i++) {
  var ch = message.charAt(i);
  if (escape(ch).length > 4) {
   inc = 2;
  } else if (ch == '\n') {
   if (message.charAt(i-1) != '\r') {
    inc = 1;
   }
  } else if (ch == '<' || ch == '>') {
   inc = 4;
  } else {
   inc = 1;
  }
  if ((nbytes + inc) > maximum) {
   break;
  }
  nbytes += inc;
  msg += ch;
}
textlimit.innerText = nbytes;
return msg;
}
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