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Filename : jquery.textareaCounter.plugin.js
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/*
 * jQuery Textarea Counter Plugin
 * Copyright (c) 2010 Roy Jin
 * Copyright (c) 2013 LeadSift
 * Version: 3.0 (11-APR-2013)
 * http://www.opensource.org/licenses/mit-license.php
 * Requires: jQuery v1.4.2 or later
 */
(function($) {
  $.fn.textareaCount = function(options, fn) {
    var defaults = {
        maxCharacterSize: -1
      , truncate: true
      , charCounter: 'standard'
      , originalStyle: 'originalTextareaInfo'
      , warningStyle: 'warningTextareaInfo'
      , errorStyle: 'errorTextareaInfo'
      , warningNumber: 20
      , displayFormat: '#input characters | #words words'
      }
      , container = $(this)
      , charLeftInfo
      , numInput = 0
      , maxCharacters = options.maxCharacterSize
      , numLeft = 0
      , numWords = 0
      , charCounters = {}
      ;

    charCounters.standard = function(content){
      return content.length;
    };

    charCounters.twitter = function(content){
      // function that counts urls as 22 chars
      // regex to match various urls ... from http://stackoverflow.com/a/6427654
      var url_length = 22
        , replacement = Array(url_length+1).join("*")
        , regex_str = "(https?:\/\/)?" + // SCHEME
          "([a-z0-9+!*(),;?&=$_.-]+(:[a-z0-9+!*(),;?&=$_.-]+)?@)?" + // User and Pass
          "([a-z0-9-.]*)\\.(travel|museum|[a-z]{2,4})" + // Host or IP
          "(:[0-9]{2,5})?" + // Port
          "(\/([a-z0-9+$_-]\\.?)+)*\/?" + // Path
          "(\\?[a-z+&$_.-][a-z0-9;:@&%=+\/$_.-]*)?" + // GET Query
          "(#[a-z_.-][a-z0-9+$_.-]*)?" // Anchor
        , regex = new RegExp(regex_str, 'gi')
        ;
      return content.replace(regex, replacement).length;
    };

    function getNewlineCount(content){
      var newlineCount = 0
        , i;
      for(i=0; i<content.length; i++){
        if(content.charAt(i) === '\n'){
          newlineCount++;
        }
      }
      return newlineCount;
    }

    function formatDisplayInfo(){
      var format = options.displayFormat;
      format = format.replace('#input', numInput);
      format = format.replace('#words', numWords);
      //When maxCharacters <= 0, #max, #left cannot be substituted.
      if(maxCharacters > 0){
        format = format.replace('#max', maxCharacters);
        format = format.replace('#left', numLeft);
      }
      return format;
    }

    function getInfo(){
      var info = {
        input: numInput,
        max: maxCharacters,
        left: numLeft,
        words: numWords
      };
      return info;
    }

    function getNextCharLeftInformation(container){
      return container.next('.charleft');
    }

    function isWin(){
      var strOS = navigator.appVersion;
      if (strOS.toLowerCase().indexOf('win') !== -1){
        return true;
      }
      return false;
    }

    function getCleanedWordString(content){
      var fullStr = content + " "
        , initial_whitespace_rExp = /^[^A-Za-z0-9]+/gi
        , left_trimmedStr = fullStr.replace(initial_whitespace_rExp, "")
        , non_alphanumerics_rExp = /[^A-Za-z0-9]+/gi
        , cleanedStr = left_trimmedStr.replace(non_alphanumerics_rExp, " ")
        , splitString = cleanedStr.split(" ")
        ;
      return splitString;
    }

    function countWord(cleanedWordString){
      var word_count = cleanedWordString.length-1;
      return word_count;
    }

    function countByCharacters(){
      var content = container.val()
        , lengthFunc = typeof(options.charCounter) === 'function'? options.charCounter : charCounters[options.charCounter]
        , contentLength = lengthFunc(content)
        , newlineCount
        , systemmaxCharacterSize
        , originalScrollTopPosition
        ;

      // Start Cut
      if(options.maxCharacterSize > 0){
        // If copied content is already more than maxCharacterSize,
        // chop it to maxCharacterSize only if truncate is true
        if(options.truncate && contentLength >= options.maxCharacterSize) {
          content = content.substring(0, options.maxCharacterSize);
        }

        newlineCount = getNewlineCount(content);

        systemmaxCharacterSize = options.maxCharacterSize;
        if (isWin()){
          // newlineCount new line character. For windows, it occupies 2 characters
          systemmaxCharacterSize = options.maxCharacterSize - newlineCount;
        }
        if(options.truncate && contentLength > systemmaxCharacterSize){
          //avoid scroll bar moving
          originalScrollTopPosition = this.scrollTop;
          container.val(content.substring(0, systemmaxCharacterSize));
          this.scrollTop = originalScrollTopPosition;
        }
        charLeftInfo.removeClass(options.warningStyle + ' ' + options.errorStyle);
        if(systemmaxCharacterSize - contentLength <= options.warningNumber){
          charLeftInfo.addClass(options.warningStyle);
        }
        if(systemmaxCharacterSize - contentLength < 0){
          charLeftInfo.addClass(options.errorStyle);
        }

        numInput = contentLength;
        if(isWin()){
          numInput = contentLength + newlineCount;
        }

        numWords = countWord(getCleanedWordString(container.val()));

        numLeft = maxCharacters - numInput;
      } else {
        //normal count, no cut
        newlineCount = getNewlineCount(content);
        numInput = contentLength;
        if(isWin()){
          numInput = contentLength + newlineCount;
        }
        numWords = countWord(getCleanedWordString(container.val()));
      }

      return formatDisplayInfo();
    }

    function limitTextAreaByCharacterCount(){
      charLeftInfo.html(countByCharacters());
      //function call back
      if(typeof fn !== 'undefined'){
        fn.call(this, getInfo());
      }
      return true;
    }

    options = $.extend(defaults, options);
    $("<div class='charleft'>&nbsp;</div>").insertAfter(container);
    charLeftInfo = getNextCharLeftInformation(container);
    charLeftInfo.addClass(options.originalStyle);

    limitTextAreaByCharacterCount();

    container.bind('keyup', function(){
      limitTextAreaByCharacterCount();}
    ).bind('mouseover paste', function(){
      setTimeout(function(){
        limitTextAreaByCharacterCount();
      }, 10);
   });
  };
})(jQuery);