60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
(function ($) {
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$.fn.characterCounter = function(){
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return this.each(function(){
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var itHasLengthAttribute = $(this).attr('length') !== undefined;
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if(itHasLengthAttribute){
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$(this).on('input', updateCounter);
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$(this).on('focus', updateCounter);
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$(this).on('blur', removeCounterElement);
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addCounterElement($(this));
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}
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});
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};
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function updateCounter(){
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var maxLength = +$(this).attr('length'),
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actualLength = +$(this).val().length,
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isValidLength = actualLength <= maxLength;
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$(this).parent().find('span[class="character-counter"]')
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.html( actualLength + '/' + maxLength);
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addInputStyle(isValidLength, $(this));
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}
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function addCounterElement($input){
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var $counterElement = $('<span/>')
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.addClass('character-counter')
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.css('float','right')
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.css('font-size','12px')
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.css('height', 1);
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$input.parent().append($counterElement);
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}
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function removeCounterElement(){
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$(this).parent().find('span[class="character-counter"]').html('');
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}
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function addInputStyle(isValidLength, $input){
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var inputHasInvalidClass = $input.hasClass('invalid');
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if (isValidLength && inputHasInvalidClass) {
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$input.removeClass('invalid');
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}
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else if(!isValidLength && !inputHasInvalidClass){
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$input.removeClass('valid');
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$input.addClass('invalid');
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}
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}
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$(document).ready(function(){
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$('input, textarea').characterCounter();
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});
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}( jQuery ));
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