[javascript] 글자수 / byte 체크

:: JS :: 

function submitCheck(){ var cnt1 = parseInt(document.getElementById('txtbyte').innerHTML); if (cnt1 < 50) { alert("50자 이상 입력 해 주세요."); return false; } } function OntextCheck(obj,target_id) { var str = new String(obj.value); var _byte = 0; if(str.length != 0) { for (var i=0; i < str.length; i++) { var str2 = str.charAt(i); if(escape(str2).length > 4) { _byte += 1; } else { _byte++; } } } target_id.innerHTML = _byte; }

:: HTML ::

<form method="post" action="" onsubmit="return submitCheck(this);" >

<textarea name="wr_5" rows="4" onkeyUp="OntextCheck(this,txtbyte);"></textarea><br/>

<span id="txtbyte" style="color:#f53f15;">0</span><label for="wr_5">/50자이상</label>

<input type="submit" value="확인">

</form>