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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'> </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);