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/*
* jQuery Textarea Characters Counter Plugin v 2.0
* Examples and documentation at: http://roy-jin.appspot.com/jsp/textareaCounter.jsp
* Copyright (c) 2010 Roy Jin
* Version: 2.0 (11-JUN-2010)
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
* Requires: jQuery v1.4.2 or later
*/
(function($){
$.fn.textareaCount = function(options, fn) {
var defaults = {
maxCharacterSize: -1,
originalStyle: 'originalTextareaInfo',
warningStyle: 'warningTextareaInfo',
warningNumber: 20,
displayFormat: '#input characters | #words words'
};
var options = $.extend(defaults, options);
var container = $(this);
$("<div class='charleft'> </div>").insertAfter(container);
//create charleft css
var charLeftCss = {
'width' : container.width()
};
var charLeftInfo = getNextCharLeftInformation(container);
charLeftInfo.addClass(options.originalStyle);
//charLeftInfo.css(charLeftCss);
var numInput = 0;
var maxCharacters = options.maxCharacterSize;
var numLeft = 0;
var numWords = 0;
container.bind('keyup', function(event){limitTextAreaByCharacterCount();})
.bind('mouseover', function(event){setTimeout(function(){limitTextAreaByCharacterCount();}, 10);})
.bind('paste', function(event){setTimeout(function(){limitTextAreaByCharacterCount();}, 10);});
limitTextAreaByCharacterCount();
function limitTextAreaByCharacterCount(){
charLeftInfo.html(countByCharacters());
//function call back
if(typeof fn != 'undefined'){
fn.call(this, getInfo());
}
return true;
}
function countByCharacters(){
var content = container.val();
var contentLength = content.length;
//Start Cut
if(options.maxCharacterSize > 0){
//If copied content is already more than maxCharacterSize, chop it to maxCharacterSize.
if(contentLength >= options.maxCharacterSize) {
content = content.substring(0, options.maxCharacterSize);
}
var newlineCount = getNewlineCount(content);
// newlineCount new line character. For windows, it occupies 2 characters
var systemmaxCharacterSize = options.maxCharacterSize - newlineCount;
if (!isWin()){
systemmaxCharacterSize = options.maxCharacterSize
}
if(contentLength > systemmaxCharacterSize){
//avoid scroll bar moving
var originalScrollTopPosition = this.scrollTop;
container.val(content.substring(0, systemmaxCharacterSize));
this.scrollTop = originalScrollTopPosition;
}
charLeftInfo.removeClass(options.warningStyle);
if(systemmaxCharacterSize - contentLength <= options.warningNumber){
charLeftInfo.addClass(options.warningStyle);
}
numInput = container.val().length + newlineCount;
if(!isWin()){
numInput = container.val().length;
}
numWords = countWord(getCleanedWordString(container.val()));
numLeft = maxCharacters - numInput;
} else {
//normal count, no cut
var newlineCount = getNewlineCount(content);
numInput = container.val().length + newlineCount;
if(!isWin()){
numInput = container.val().length;
}
numWords = countWord(getCleanedWordString(container.val()));
}
return formatDisplayInfo();
}
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 getNewlineCount(content){
var newlineCount = 0;
for(var i=0; i<content.length;i++){
if(content.charAt(i) == '\n'){
newlineCount++;
}
}
return newlineCount;
}
function getCleanedWordString(content){
var fullStr = content + " ";
var initial_whitespace_rExp = /^[^A-Za-z0-9]+/gi;
var left_trimmedStr = fullStr.replace(initial_whitespace_rExp, "");
var non_alphanumerics_rExp = rExp = /[^A-Za-z0-9]+/gi;
var cleanedStr = left_trimmedStr.replace(non_alphanumerics_rExp, " ");
var splitString = cleanedStr.split(" ");
return splitString;
}
function countWord(cleanedWordString){
var word_count = cleanedWordString.length-1;
return word_count;
}
};
})(jQuery);