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Viewing file:     bootstrap-maxlength.js (12.51 KB)      -rw-r--r--

(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();

              // Remove all double-character (\r\n) linebreaks, so they're counted only once.
              text = text.replace(new RegExp('\r?\n','g'), '\n');
              // var matches = text.match(/\n/g);

              var currentLength = 0;

              if (options.utf8) {
                currentLength = utf8Length(input.val());
              } else {
                currentLength = input.val().length;
              }
              return currentLength;
            }

          /**
          * 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,
                  maxLengthIndicator;

              $(window).resize(function() {
                if(maxLengthIndicator) {
                  place(currentInput, maxLengthIndicator);
                }
              });

              currentInput.focus(function () {
                var maxlengthContent = updateMaxLengthHTML(maxLengthCurrentInput, '0');
                  maxLengthCurrentInput = getMaxLength(currentInput);

                  if (!maxLengthIndicator) {
                    maxLengthIndicator = $('<span class="bootstrap-maxlength"></span>').css({
                      display: 'none',
                      position: 'absolute',
                      whiteSpace: 'nowrap',
                      zIndex: 1099
                    }).html(maxlengthContent);
                  }


                // 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);

                var remaining = remainingChars(currentInput, getMaxLength(currentInput));
                    manageRemainingVisibility(remaining, currentInput, maxLengthCurrentInput, maxLengthIndicator);
                    place(currentInput, maxLengthIndicator);
              });

                currentInput.blur(function() {
                    maxLengthIndicator.remove();
                });

                currentInput.keyup(function() {
                    var remaining = remainingChars(currentInput, getMaxLength(currentInput)),
                        output = true;
                    if (options.validate && remaining < 0) {
                        output = false;
                    } else {
                        manageRemainingVisibility(remaining, currentInput, maxLengthCurrentInput, maxLengthIndicator);
                    }
                    return output;
                });
            });
        }
    });
}(jQuery));