https://www.farmaciadeanca.es/modules/correosexpress/views/js/textareaCounter.js

1/*
2 * jQuery Textarea Characters Counter Plugin v 2.0
3 * Examples and documentation at: http://roy-jin.appspot.com/jsp/textareaCounter.jsp
4 * Copyright (c) 2010 Roy Jin
5 * Version: 2.0 (11-JUN-2010)
6 * Dual licensed under the MIT and GPL licenses:
7 * http://www.opensource.org/licenses/mit-license.php
8 * http://www.gnu.org/licenses/gpl.html
9 * Requires: jQuery v1.4.2 or later
10 */
11(function($){  
12    $.fn.textareaCount = function(options, fn) {   
13        var defaults = {  
14            maxCharacterSize: -1,  
15            originalStyle: 'originalTextareaInfo',
16            warningStyle: 'warningTextareaInfo',  
17            warningNumber: 20,
18            displayFormat: '#input caracteres | #words palabras'
19        };  
20        var options = $.extend(defaults, options);
21        
22        var container = $(this);
23        
24        $("<div class='charleft'>&nbsp;</div>").insertAfter(container);
25        
26        //create charleft css
27        var charLeftCss = {
28            'width' : container.width()
29        };
30        
31        var charLeftInfo = getNextCharLeftInformation(container);
32        charLeftInfo.addClass(options.originalStyle);
33        charLeftInfo.css(charLeftCss);
34        
35        var numInput = 0;
36        var maxCharacters = options.maxCharacterSize;
37        var numLeft = 0;
38        var numWords = 0;
39                
40        container.bind('keyup', function(event){limitTextAreaByCharacterCount();})
41                 .bind('mouseover', function(event){setTimeout(function(){limitTextAreaByCharacterCount();}, 10);})
42                 .bind('paste', function(event){setTimeout(function(){limitTextAreaByCharacterCount();}, 10);});
43        
44        function limitTextAreaByCharacterCount(){
45            charLeftInfo.html(countByCharacters());
46            //function call back
47            if(typeof fn != 'undefined'){
48                fn.call(this, getInfo());
49            }
50            return true;
51        }
52        
53        function countByCharacters(){
54            var content = container.val();
55            var contentLength = content.length;
56            
57            //Start Cut
58            if(options.maxCharacterSize > 0){
59                //If copied content is already more than maxCharacterSize, chop it to maxCharacterSize.
60                if(contentLength >= options.maxCharacterSize) {
61                    content = content.substring(0, options.maxCharacterSize);                 
62                }
63                
64                var newlineCount = getNewlineCount(content);
65                
66                // newlineCount new line character. For windows, it occupies 2 characters
67                var systemmaxCharacterSize = options.maxCharacterSize - newlineCount;
68                if (!isWin()){
69                     systemmaxCharacterSize = options.maxCharacterSize
70                }
71                if(contentLength > systemmaxCharacterSize){
72                    //avoid scroll bar moving
73                    var originalScrollTopPosition = this.scrollTop;
74                    container.val(content.substring(0, systemmaxCharacterSize));
75                    this.scrollTop = originalScrollTopPosition;
76                }
77                charLeftInfo.removeClass(options.warningStyle);
78                if(systemmaxCharacterSize - contentLength <= options.warningNumber){
79                    charLeftInfo.addClass(options.warningStyle);
80                }
81                
82                numInput = container.val().length + newlineCount;
83                if(!isWin()){
84                    numInput = container.val().length;
85                }
86            
87                numWords = countWord(getCleanedWordString(container.val()));
88                
89                numLeft = maxCharacters - numInput;
90            } else {
91                //normal count, no cut
92                var newlineCount = getNewlineCount(content);
93                numInput = container.val().length + newlineCount;
94                if(!isWin()){
95                    numInput = container.val().length;
96                }
97                numWords = countWord(getCleanedWordString(container.val()));
98            }
99            
100            return formatDisplayInfo();
101        }
102        
103        function formatDisplayInfo(){
104            var format = options.displayFormat;
105            format = format.replace('#input', numInput);
106            format = format.replace('#words', numWords);
107            //When maxCharacters <= 0, #max, #left cannot be substituted.
108            if(maxCharacters > 0){
109                format = format.replace('#max', maxCharacters);
110                format = format.replace('#left', numLeft);
111            }
112            return format;
113        }
114        
115        function getInfo(){
116            var info = {
117                input: numInput,
118                max: maxCharacters,
119                left: numLeft,
120                words: numWords
121            };
122            return info;
123        }
124        
125        function getNextCharLeftInformation(container){
126                return container.next('.charleft');
127        }
128        
129        function isWin(){
130            var strOS = navigator.appVersion;
131            if (strOS.toLowerCase().indexOf('win') != -1){
132                return true;
133            }
134            return false;

135        }
136        
137        function getNewlineCount(content){
138            var newlineCount = 0;
139            for(var i=0; i<content.length;i++){
140                if(content.charAt(i) == '\n'){
141                    newlineCount++;
142                }
143            }
144            return newlineCount;
145        }
146        
147        function getCleanedWordString(content){
148            var fullStr = content + " ";
149            var initial_whitespace_rExp = /^[^A-Za-z0-9]+/gi;
150            var left_trimmedStr = fullStr.replace(initial_whitespace_rExp, "");
151            var non_alphanumerics_rExp = rExp = /[^A-Za-z0-9]+/gi;
152            var cleanedStr = left_trimmedStr.replace(non_alphanumerics_rExp, " ");
153            var splitString = cleanedStr.split(" ");
154            return splitString;
155        }
156        
157        function countWord(cleanedWordString){
158            var word_count = cleanedWordString.length-1;
159            return word_count;
160        }
161    };  
162})(jQuery);