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Mini Shell
Mini Shell
/* ==========================================================
* bootstrap-maxlength.js v1.4.2
*
* Copyright (c) 2013 Maurizio Napoleoni;
*
* Licensed under the terms of the MIT license.
* See: https://github.com/mimo84/bootstrap-maxlength/blob/master/LICENSE
* ========================================================== */
/*jslint browser:true*/
/*global jQuery*/
(function ($) {
"use strict";
$.fn.extend({
maxlength: function (options, callback) {
var documentBody = $('body'),
defaults = {
alwaysShow: false, // if true the indicator it's always shown.
threshold: 10, // Represents how many chars left are needed to show up the counter
warningClass: "label label-success",
limitReachedClass: "label label-important",
separator: ' / ',
preText: '',
postText: '',
showMaxLength : true,
placement: 'bottom',
showCharsTyped: true, // show the number of characters typed and not the number of characters remaining
validate: false, // if the browser doesn't support the maxlength attribute, attempt to type more than
// the indicated chars, will be prevented.
utf8: false // counts using bytesize rather than length. eg: '£' is counted as 2 characters.
};
if ($.isFunction(options) && !callback) {
callback = options;
options = {};
}
options = $.extend(defaults, options);
/**
* Return the length of the specified input.
*
* @param input
* @return {number}
*/
function inputLength(input) {
var text = input.val();
var matches = text.match(/\n/g);
var breaks = 0;
var inputLength = 0;
if (options.utf8) {
breaks = matches ? getUTF8Length(matches) : 0;
inputLength = getUTF8Length(input.val()) + breaks;
} else {
breaks = matches ? matches.length : 0;
inputLength = input.val().length + breaks;
}
return inputLength;
}
/**
* Return the length of the specified input in UTF8 encoding.
*
* @param input
* @return {number}
*/
function utf8Length(string) {
var utf8length = 0;
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utf8length++;
}
else if((c > 127) && (c < 2048)) {
utf8length = utf8length+2;
}
else {
utf8length = utf8length+3;
}
}
return utf8length;
}
/**
* Return true if the indicator should be showing up.
*
* @param input
* @param thereshold
* @param maxlength
* @return {number}
*/
function charsLeftThreshold(input, thereshold, maxlength) {
var output = true;
if (!options.alwaysShow && (maxlength - inputLength(input) > thereshold)) {
output = false;
}
return output;
}
/**
* Returns how many chars are left to complete the fill up of the form.
*
* @param input
* @param maxlength
* @return {number}
*/
function remainingChars(input, maxlength) {
var length = maxlength - inputLength(input);
return length;
}
/**
* When called displays the indicator.
*
* @param indicator
*/
function showRemaining(indicator) {
indicator.css({
display: 'block'
});
}
/**
* When called shows the indicator.
*
* @param indicator
*/
function hideRemaining(indicator) {
indicator.css({
display: 'none'
});
}
/**
* This function updates the value in the indicator
*
* @param maxLengthThisInput
* @param typedChars
* @return String
*/
function updateMaxLengthHTML(maxLengthThisInput, typedChars) {
var output = '';
if (options.message){
output = options.message.replace('%charsTyped%', typedChars)
.replace('%charsRemaining%', maxLengthThisInput - typedChars)
.replace('%charsTotal%', maxLengthThisInput);
} else {
if (options.preText) {
output += options.preText;
}
if (!options.showCharsTyped) {
output += maxLengthThisInput - typedChars;
}
else {
output += typedChars;
}
if (options.showMaxLength) {
output += options.separator + maxLengthThisInput;
}
if (options.postText) {
output += options.postText;
}
}
return output;
}
/**
* This function updates the value of the counter in the indicator.
* Wants as parameters: the number of remaining chars, the element currently managed,
* the maxLength for the current input and the indicator generated for it.
*
* @param remaining
* @param currentInput
* @param maxLengthCurrentInput
* @param maxLengthIndicator
*/
function manageRemainingVisibility(remaining, currentInput, maxLengthCurrentInput, maxLengthIndicator) {
maxLengthIndicator.html(updateMaxLengthHTML(maxLengthCurrentInput, (maxLengthCurrentInput - remaining)));
if (remaining > 0) {
if (charsLeftThreshold(currentInput, options.threshold, maxLengthCurrentInput)) {
showRemaining(maxLengthIndicator.removeClass(options.limitReachedClass).addClass(options.warningClass));
} else {
hideRemaining(maxLengthIndicator);
}
} else {
showRemaining(maxLengthIndicator.removeClass(options.warningClass).addClass(options.limitReachedClass));
}
}
/**
* This function returns an object containing all the
* informations about the position of the current input
*
* @param currentInput
* @return object {bottom height left right top width}
*
*/
function getPosition(currentInput) {
var el = currentInput[0];
return $.extend({}, (typeof el.getBoundingClientRect === 'function') ? el.getBoundingClientRect() : {
width: el.offsetWidth,
height: el.offsetHeight
}, currentInput.offset());
}
/**
* This function places the maxLengthIndicator at the
* top / bottom / left / right of the currentInput
*
* @param currentInput
* @param maxLengthIndicator
* @return null
*
*/
function place(currentInput, maxLengthIndicator) {
var pos = getPosition(currentInput),
inputOuter = currentInput.outerWidth(),
outerWidth = maxLengthIndicator.outerWidth(),
actualWidth = maxLengthIndicator.width(),
actualHeight = maxLengthIndicator.height();
switch (options.placement) {
case 'bottom':
maxLengthIndicator.css({top: pos.top + pos.height, left: pos.left + pos.width / 2 - actualWidth / 2});
break;
case 'top':
maxLengthIndicator.css({top: pos.top - actualHeight, left: pos.left + pos.width / 2 - actualWidth / 2});
break;
case 'left':
maxLengthIndicator.css({top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth});
break;
case 'right':
maxLengthIndicator.css({top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width});
break;
case 'bottom-right':
maxLengthIndicator.css({top: pos.top + pos.height, left: pos.left + pos.width});
break;
case 'top-right':
maxLengthIndicator.css({top: pos.top - actualHeight, left: pos.left + inputOuter});
break;
case 'top-left':
maxLengthIndicator.css({top: pos.top - actualHeight, left: pos.left - outerWidth});
break;
case 'bottom-left':
maxLengthIndicator.css({top: pos.top + currentInput.outerHeight(), left: pos.left - outerWidth});
break;
case 'centered-right':
maxLengthIndicator.css({top: pos.top + (actualHeight / 2), left: pos.left + inputOuter - outerWidth - 3});
break;
}
}
/**
* This function retrieves the maximum length of currentInput
*
* @param currentInput
* @return {number}
*
*/
function getMaxLength(currentInput) {
return currentInput.attr('maxlength') || currentInput.attr('size');
}
return this.each(function() {
var currentInput = $(this),
maxLengthCurrentInput = getMaxLength(currentInput),
maxLengthIndicator = $('<span></span>').css({
display: 'none',
position: 'absolute',
whiteSpace: 'nowrap',
zIndex: 1099
}).html(updateMaxLengthHTML(maxLengthCurrentInput, '0'));
// We need to detect resizes if we are dealing with a textarea:
if (currentInput.is('textarea')) {
currentInput.data('maxlenghtsizex', currentInput.outerWidth());
currentInput.data('maxlenghtsizey', currentInput.outerHeight());
currentInput.mouseup(function() {
if (currentInput.outerWidth() !== currentInput.data('maxlenghtsizex') || currentInput.outerHeight() !== currentInput.data('maxlenghtsizey')) {
place(currentInput, maxLengthIndicator);
}
currentInput.data('maxlenghtsizex', currentInput.outerWidth());
currentInput.data('maxlenghtsizey', currentInput.outerHeight());
});
}
documentBody.append(maxLengthIndicator);
currentInput.focus(function() {
var remaining = remainingChars(currentInput, getMaxLength(currentInput));
manageRemainingVisibility(remaining, currentInput, maxLengthCurrentInput, maxLengthIndicator);
place(currentInput, maxLengthIndicator);
});
$(window).resize(function() {
place(currentInput, maxLengthIndicator);
});
currentInput.blur(function() {
maxLengthIndicator.css('display', 'none');
});
currentInput.keyup(function(e) {
var remaining = remainingChars(currentInput, getMaxLength(currentInput)),
output = true,
keyCode = e.keyCode || e.which;
// Handle the tab press when the maxlength have been reached.
if (remaining===0 && keyCode===9 && !e.shiftKey) {
currentInput.attr('maxlength',getMaxLength(currentInput)+1)
.trigger({
type: 'keypress',
which: 9
}).attr('maxlength',getMaxLength(currentInput)-1);
}
if (options.validate && remaining < 0) {
output = false;
} else {
manageRemainingVisibility(remaining, currentInput, maxLengthCurrentInput, maxLengthIndicator);
}
return output;
});
});
}
});
}(jQuery));
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