<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script> <script type="text/javascript"> $(function() { $("textarea").keyup(); }); function strLenCalc(obj, checklen, maxlen) { var v = obj.val(), charlen = 0, maxlen = !maxlen ? 200 : maxlen, curlen = maxlen, len = v.length; for(var i = 0; i < v.length; i++) { if(v.charCodeAt(i) < 0 || v.charCodeAt(i) > 255) { curlen - = 1; } } if(curlen >= len) { $("#"+checklen).html("You can also enter <strong>"+Math.floor((curlen-len)/2)+"</strong> characters").css('color', ' '); $("#subBtn").removeAttr("disabled"); } else { $("#"+checklen).html("It has exceeded <strong>"+Math.ceil((len-curlen)/2)+"</strong> characters").css('color', '# FF0000'); $("#subBtn").attr("disabled", "disabled"); } } </script> <textarea tabindex="11" onkeyup="strLenCalc($(this), 'checklen', 80);" value="" class="px" name="subject" id="subject"></textarea> <span id="checklen">Also enter <strong>40</strong> Chinese characters</span> <input type="submit" id="subBtn" value="发布" />
jQuery implements textarea publishing box to limit the number of characters input (add Chinese recognition)
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