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/*
* jQuery Simply Countable plugin
* Provides a character counter for any text input or textarea
*
* @version 0.4.2
* @homepage http://github.com/aaronrussell/jquery-simply-countable/
* @author Aaron Russell (http://www.aaronrussell.co.uk)
*
* Copyright (c) 2009-2010 Aaron Russell (aaron@gc4.co.uk)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
*/
(function($) {
$.fn.simplyCountable = function(options) {
options = $.extend({
counter: '#counter',
countType: 'characters',
maxCount: 140,
strictMax: false,
countDirection: 'down',
safeClass: 'safe',
overClass: 'over',
thousandSeparator: ',',
onOverCount: function() {
},
onSafeCount: function() {
},
onMaxCount: function() {
}
}, options);
var navKeys = [33, 34, 35, 36, 37, 38, 39, 40];
return $(this).each(function() {
var countable = $(this);
var counter = $(options.counter);
if (!counter.length) {
return false;
}
var countCheck = function() {
var count;
var revCount;
var reverseCount = function(ct) {
return ct - (ct * 2) + options.maxCount;
}
var countInt = function() {
return (options.countDirection === 'up') ? revCount : count;
}
var numberFormat = function(ct) {
var prefix = '';
if (options.thousandSeparator) {
ct = ct.toString();
// Handle large negative numbers
if (ct.match(/^-/)) {
ct = ct.substr(1);
prefix = '-';
}
for (var i = ct.length - 3; i > 0; i -= 3) {
ct = ct.substr(0, i) + options.thousandSeparator + ct.substr(i);
}
}
return prefix + ct;
}
var changeCountableValue = function(val) {
countable.val(val).trigger('change');
}
/* Calculates count for either words or characters */
if (options.countType === 'words') {
count = options.maxCount - $.trim(countable.val()).split(/\s+/).length;
if (countable.val() === '') {
count += 1;
}
}
else {
count = options.maxCount - countable.val().length;
}
revCount = reverseCount(count);
/* If strictMax set restrict further characters */
if (options.strictMax && count <= 0) {
var content = countable.val();
if (count < 0) {
options.onMaxCount(countInt(), countable, counter);
}
if (options.countType === 'words') {
var allowedText = content.match(new RegExp('\\s?(\\S+\\s+){' + options.maxCount + '}'));
if (allowedText) {
changeCountableValue(allowedText[0]);
}
}
else {
changeCountableValue(content.substring(0, options.maxCount));
}
count = 0, revCount = options.maxCount;
}
counter.text(numberFormat(countInt()));
/* Set CSS class rules and API callbacks */
if (!counter.hasClass(options.safeClass) && !counter.hasClass(options.overClass)) {
if (count < 0) {
counter.addClass(options.overClass);
}
else {
counter.addClass(options.safeClass);
}
}
else if (count < 0 && counter.hasClass(options.safeClass)) {
counter.removeClass(options.safeClass).addClass(options.overClass);
options.onOverCount(countInt(), countable, counter);
}
else if (count >= 0 && counter.hasClass(options.overClass)) {
counter.removeClass(options.overClass).addClass(options.safeClass);
options.onSafeCount(countInt(), countable, counter);
}
};
countCheck();
countable.on('keyup blur paste', function(e) {
switch (e.type) {
case 'keyup':
// Skip navigational key presses
if ($.inArray(e.which, navKeys) < 0) {
countCheck();
}
break;
case 'paste':
// Wait a few miliseconds if a paste event
setTimeout(countCheck, (e.type === 'paste' ? 5 : 0));
break;
default:
countCheck();
break;
}
});
});
};
})(jQuery);
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