https://www.nami.org/wp-content/plugins/gravityforms/js/jquery.textareaCounter.plugin.js?ver=2.9.24

1/*
2 * jQuery Textarea Counter Plugin
3 * Copyright (c) 2010 Roy Jin
4 * Copyright (c) 2013 LeadSift
5 * Version: 3.0 (11-APR-2013)
6 * http://www.opensource.org/licenses/mit-license.php
7 * Requires: jQuery v1.4.2 or later
8 */
9(function($) {
10  $.fn.textareaCount = function(options, fn) {
11    var defaults = {
12        maxCharacterSize: -1
13      , truncate: true
14      , charCounter: 'standard'
15      , originalStyle: 'originalTextareaInfo'
16      , warningStyle: 'warningTextareaInfo'
17      , errorStyle: 'errorTextareaInfo'
18      , warningNumber: 20
19      , displayFormat: '#input characters | #words words'
20      }
21      , container = $(this)
22      , charLeftInfo
23      , numInput = 0
24      , maxCharacters = options.maxCharacterSize
25      , numLeft = 0
26      , numWords = 0
27      , charCounters = {}
28      ;
29
30    charCounters.standard = function(content){
31      return content.length;
32    };
33
34    charCounters.twitter = function(content){
35      // function that counts urls as 22 chars
36      // regex to match various urls ... from http://stackoverflow.com/a/6427654
37      var url_length = 22
38        , replacement = Array(url_length+1).join("*")
39        , regex_str = "(https?:\/\/)?" + // SCHEME
40          "([a-z0-9+!*(),;?&=$_.-]+(:[a-z0-9+!*(),;?&=$_.-]+)?@)?" + // User and Pass
41          "([a-z0-9-.]*)\\.(travel|museum|[a-z]{2,4})" + // Host or IP
42          "(:[0-9]{2,5})?" + // Port
43          "(\/([a-z0-9+$_-]\\.?)+)*\/?" + // Path
44          "(\\?[a-z+&$_.-][a-z0-9;:@&%=+\/$_.-]*)?" + // GET Query
45          "(#[a-z_.-][a-z0-9+$_.-]*)?" // Anchor
46        , regex = new RegExp(regex_str, 'gi')
47        ;
48      return content.replace(regex, replacement).length;
49    };
50
51    function getNewlineCount(content){
52      var newlineCount = 0
53        , i;
54      for(i=0; i<content.length; i++){
55        if(content.charAt(i) === '\n'){
56          newlineCount++;
57        }
58      }
59      return newlineCount;
60    }
61
62    function formatDisplayInfo(){
63      var format = options.displayFormat;
64      format = format.replace('#input', numInput);
65      format = format.replace('#words', numWords);
66      //When maxCharacters <= 0, #max, #left cannot be substituted.
67      if(maxCharacters > 0){
68        format = format.replace('#max', maxCharacters);
69        format = format.replace('#left', numLeft);
70      }
71      return format;
72    }
73
74    function getInfo(){
75      var info = {
76        input: numInput,
77        max: maxCharacters,
78        left: numLeft,
79        words: numWords
80      };
81      return info;
82    }
83
84    function getNextCharLeftInformation(container){
85      return container.next('.charleft');
86    }
87
88    function isWin(){
89      var strOS = navigator.appVersion;
90      if (strOS.toLowerCase().indexOf('win') !== -1){
91        return true;
92      }
93      return false;
94    }
95
96    function getCleanedWordString(content){
97      var fullStr = content + " "
98        , initial_whitespace_rExp = /^[^A-Za-z0-9]+/gi
99        , left_trimmedStr = fullStr.replace(initial_whitespace_rExp, "")
100        , non_alphanumerics_rExp = /[^A-Za-z0-9]+/gi
101        , cleanedStr = left_trimmedStr.replace(non_alphanumerics_rExp, " ")
102        , splitString = cleanedStr.split(" ")
103        ;
104      return splitString;
105    }
106
107    function countWord(cleanedWordString){
108      var word_count = cleanedWordString.length-1;
109      return word_count;
110    }
111
112    function countByCharacters(){
113      var content = container.val()
114        , lengthFunc = typeof(options.charCounter) === 'function'? options.charCounter : charCounters[options.charCounter]
115        , contentLength = lengthFunc(content)
116        , newlineCount
117        , systemmaxCharacterSize
118        , originalScrollTopPosition
119        ;
120
121      // Start Cut
122      if(options.maxCharacterSize > 0){
123        // If copied content is already more than maxCharacterSize,
124        // chop it to maxCharacterSize only if truncate is true
125        if(options.truncate && contentLength >= options.maxCharacterSize) {
126          content = content.substring(0, options.maxCharacterSize);
127        }
128
129        newlineCount = getNewlineCount(content);
130
131        systemmaxCharacterSize = options.maxCharacterSize;
132        if (isWin()){
133          // newlineCount new line character. For windows, it occupies 2 characters
134          systemmaxCharacterSize = options.maxCharacterSize - newlineCount;
135        }
136        if(options.truncate && contentLength > systemmaxCharacterSize){
137          //avoid scroll bar moving
138          originalScrollTopPosition = this.scrollTop;
139          container.val(content.substring(0, systemmaxCharacterSize));
140          this.scrollTop = originalScrollTopPosition;
141        }
142        charLeftInfo.removeClass(options.warningStyle + ' ' + options.errorStyle);
143        if(systemmaxCharacterSize - contentLength <= options.warningNumber){
144          charLeftInfo.addClass(options.warningStyle);
145        }
146        if(systemmaxCharacterSize - contentLength < 0){
147          charLeftInfo.addClass(options.errorStyle);
148        }
149
150        numInput = contentLength;
151        if(isWin()){
152          numInput = contentLength + newlineCount;
153        }
154
155        numWords = countWord(getCleanedWordString(container.val()));
156
157        numLeft = maxCharacters - numInput;
158      } else {
159        //normal count, no cut
160        newlineCount = getNewlineCount(content);
161        numInput = contentLength;
162        if(isWin()){
163          numInput = contentLength + newlineCount;
164        }
165        numWords = countWord(getCleanedWordString(container.val()));
166      }
167
168      return formatDisplayInfo();
169    }
170
171    function limitTextAreaByCharacterCount(){
172      charLeftInfo.html(countByCharacters());
173      //function call back
174      if(typeof fn !== 'undefined'){
175        fn.call(this, getInfo());
176      }
177      return true;
178    }
179
180    options = $.extend(defaults, options);
181    $("<div class='charleft'>&nbsp;</div>").insertAfter(container);
182    charLeftInfo = getNextCharLeftInformation(container);
183    charLeftInfo.addClass(options.originalStyle);
184
185    limitTextAreaByCharacterCount();
186
187    container.bind('keyup', function(){
188      limitTextAreaByCharacterCount();}
189    ).bind('mouseover paste', function(){
190      setTimeout(function(){
191        limitTextAreaByCharacterCount();
192      }, 10);
193   });
194  };
195})(jQuery);