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447 lines
17 KiB
JavaScript
447 lines
17 KiB
JavaScript
/*!
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Copyright (c) 2011 Peter van der Spek
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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(function($) {
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/**
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* Hash containing mapping of selectors to settings hashes for target selectors that should be live updated.
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*
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* @type {Object.<string, Object>}
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* @private
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*/
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var liveUpdatingTargetSelectors = {};
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/**
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* Interval ID for live updater. Contains interval ID when the live updater interval is active, or is undefined
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* otherwise.
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*
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* @type {number}
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* @private
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*/
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var liveUpdaterIntervalId;
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/**
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* Boolean indicating whether the live updater is running.
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*
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* @type {boolean}
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* @private
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*/
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var liveUpdaterRunning = false;
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/**
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* Set of default settings.
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*
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* @type {Object.<string, string>}
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* @private
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*/
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var defaultSettings = {
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ellipsis: '...',
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setTitle: 'never',
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live: false
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};
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/**
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* Perform ellipsis on selected elements.
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*
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* @param {string} selector the inner selector of elements that ellipsis may work on. Inner elements not referred to by this
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* selector are left untouched.
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* @param {Object.<string, string>=} options optional options to override default settings.
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* @return {jQuery} the current jQuery object for chaining purposes.
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* @this {jQuery} the current jQuery object.
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*/
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$.fn.ellipsis = function(selector, options) {
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var subjectElements, settings;
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subjectElements = $(this);
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// Check for options argument only.
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if (typeof selector !== 'string') {
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options = selector;
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selector = undefined;
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}
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// Create the settings from the given options and the default settings.
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settings = $.extend({}, defaultSettings, options);
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// If selector is not set, work on immediate children (default behaviour).
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settings.selector = selector;
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// Do ellipsis on each subject element.
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subjectElements.each(function() {
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var elem = $(this);
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// Do ellipsis on subject element.
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ellipsisOnElement(elem, settings);
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});
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// If live option is enabled, add subject elements to live updater. Otherwise remove from live updater.
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if (settings.live) {
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addToLiveUpdater(subjectElements.selector, settings);
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} else {
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removeFromLiveUpdater(subjectElements.selector);
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}
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// Return jQuery object for chaining.
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return this;
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};
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/**
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* Perform ellipsis on the given container.
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*
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* @param {jQuery} containerElement jQuery object containing one DOM element to perform ellipsis on.
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* @param {Object.<string, string>} settings the settings for this ellipsis operation.
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* @private
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*/
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function ellipsisOnElement(containerElement, settings) {
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var containerData = containerElement.data('jqae');
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if (!containerData) containerData = {};
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// Check if wrapper div was already created and bound to the container element.
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var wrapperElement = containerData.wrapperElement;
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// If not, create wrapper element.
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if (!wrapperElement) {
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wrapperElement = containerElement.wrapInner('<div/>').find('>div');
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// Wrapper div should not add extra size.
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wrapperElement.css({
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margin: 0,
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padding: 0,
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border: 0
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});
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}
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// Check if the original wrapper element content was already bound to the wrapper element.
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var wrapperElementData = wrapperElement.data('jqae');
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if (!wrapperElementData) wrapperElementData = {};
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var wrapperOriginalContent = wrapperElementData.originalContent;
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// If so, clone the original content, re-bind the original wrapper content to the clone, and replace the
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// wrapper with the clone.
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if (wrapperOriginalContent) {
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wrapperElement = wrapperElementData.originalContent.clone(true)
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.data('jqae', {originalContent: wrapperOriginalContent}).replaceAll(wrapperElement);
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} else {
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// Otherwise, clone the current wrapper element and bind it as original content to the wrapper element.
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wrapperElement.data('jqae', {originalContent: wrapperElement.clone(true)});
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}
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// Bind the wrapper element and current container width and height to the container element. Current container
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// width and height are stored to detect changes to the container size.
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containerElement.data('jqae', {
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wrapperElement: wrapperElement,
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containerWidth: containerElement.width(),
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containerHeight: containerElement.height()
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});
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// Calculate with current container element height.
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var containerElementHeight = containerElement.height();
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// Calculate wrapper offset.
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var wrapperOffset = (parseInt(containerElement.css('padding-top'), 10) || 0) + (parseInt(containerElement.css('border-top-width'), 10) || 0) - (wrapperElement.offset().top - containerElement.offset().top);
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// Normally the ellipsis characters are applied to the last non-empty text-node in the selected element. If the
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// selected element becomes empty during ellipsis iteration, the ellipsis characters cannot be applied to that
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// selected element, and must be deferred to the previous selected element. This parameter keeps track of that.
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var deferAppendEllipsis = false;
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// Loop through all selected elements in reverse order.
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var selectedElements = wrapperElement;
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if (settings.selector) selectedElements = $(wrapperElement.find(settings.selector).get().reverse());
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selectedElements.each(function() {
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var selectedElement = $(this),
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originalText = selectedElement.text(),
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ellipsisApplied = false;
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// Check if we can safely remove the selected element. This saves a lot of unnecessary iterations.
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if (wrapperElement.innerHeight() - selectedElement.innerHeight() > containerElementHeight + wrapperOffset) {
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selectedElement.remove();
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} else {
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// Reverse recursively remove empty elements, until the element that contains a non-empty text-node.
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removeLastEmptyElements(selectedElement);
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// If the selected element has not become empty, start ellipsis iterations on the selected element.
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if (selectedElement.contents().length) {
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// If a deffered ellipsis is still pending, apply it now to the last text-node.
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if (deferAppendEllipsis) {
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getLastTextNode(selectedElement).get(0).nodeValue += settings.ellipsis;
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deferAppendEllipsis = false;
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}
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// Iterate until wrapper element height is less than or equal to the original container element
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// height plus possible wrapperOffset.
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while (wrapperElement.innerHeight() > containerElementHeight + wrapperOffset) {
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// Apply ellipsis on last text node, by removing one word.
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ellipsisApplied = ellipsisOnLastTextNode(selectedElement);
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// If ellipsis was succesfully applied, remove any remaining empty last elements and append the
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// ellipsis characters.
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if (ellipsisApplied) {
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removeLastEmptyElements(selectedElement);
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// If the selected element is not empty, append the ellipsis characters.
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if (selectedElement.contents().length) {
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getLastTextNode(selectedElement).get(0).nodeValue += settings.ellipsis;
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} else {
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// If the selected element has become empty, defer the appending of the ellipsis characters
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// to the previous selected element.
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deferAppendEllipsis = true;
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selectedElement.remove();
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break;
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}
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} else {
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// If ellipsis could not be applied, defer the appending of the ellipsis characters to the
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// previous selected element.
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deferAppendEllipsis = true;
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selectedElement.remove();
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break;
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}
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}
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// If the "setTitle" property is set to "onEllipsis" and the ellipsis has been applied, or if the
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// property is set to "always", the add the "title" attribute with the original text. Else remove the
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// "title" attribute. When the "setTitle" property is set to "never" we do not touch the "title"
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// attribute.
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if (((settings.setTitle == 'onEllipsis') && ellipsisApplied) || (settings.setTitle == 'always')) {
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selectedElement.attr('title', originalText);
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} else if (settings.setTitle != 'never') {
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selectedElement.removeAttr('title');
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}
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}
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}
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});
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}
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/**
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* Performs ellipsis on the last text node of the given element. Ellipsis is done by removing a full word.
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*
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* @param {jQuery} element jQuery object containing a single DOM element.
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* @return {boolean} true when ellipsis has been done, false otherwise.
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* @private
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*/
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function ellipsisOnLastTextNode(element) {
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var lastTextNode = getLastTextNode(element);
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// If the last text node is found, do ellipsis on that node.
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if (lastTextNode.length) {
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var text = lastTextNode.get(0).nodeValue;
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// Find last space character, and remove text from there. If no space is found the full remaining text is
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// removed.
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var pos = text.lastIndexOf(' ');
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if (pos > -1) {
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text = $.trim(text.substring(0, pos));
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lastTextNode.get(0).nodeValue = text;
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} else {
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lastTextNode.get(0).nodeValue = '';
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}
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return true;
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}
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return false;
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}
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/**
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* Get last text node of the given element.
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*
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* @param {jQuery} element jQuery object containing a single element.
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* @return {jQuery} jQuery object containing a single text node.
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* @private
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*/
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function getLastTextNode(element) {
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if (element.contents().length) {
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// Get last child node.
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var contents = element.contents();
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var lastNode = contents.eq(contents.length - 1);
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// If last node is a text node, return it.
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if (lastNode.filter(textNodeFilter).length) {
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return lastNode;
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} else {
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// Else it is an element node, and we recurse into it.
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return getLastTextNode(lastNode);
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}
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} else {
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// If there is no last child node, we append an empty text node and return that. Normally this should not
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// happen, as we test for emptiness before calling getLastTextNode.
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element.append('');
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var contents = element.contents();
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return contents.eq(contents.length - 1);
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}
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}
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/**
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* Remove last empty elements. This is done recursively until the last element contains a non-empty text node.
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*
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* @param {jQuery} element jQuery object containing a single element.
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* @return {boolean} true when elements have been removed, false otherwise.
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* @private
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*/
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function removeLastEmptyElements(element) {
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if (element.contents().length) {
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// Get last child node.
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var contents = element.contents();
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var lastNode = contents.eq(contents.length - 1);
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// If last child node is a text node, check for emptiness.
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if (lastNode.filter(textNodeFilter).length) {
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var text = lastNode.get(0).nodeValue;
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text = $.trim(text);
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if (text == '') {
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// If empty, remove the text node.
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lastNode.remove();
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return true;
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} else {
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return false;
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}
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} else {
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// If the last child node is an element node, remove the last empty child nodes on that node.
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while (removeLastEmptyElements(lastNode)) {
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}
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// If the last child node contains no more child nodes, remove the last child node.
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if (lastNode.contents().length) {
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return false;
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} else {
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lastNode.remove();
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Filter for testing on text nodes.
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*
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* @return {boolean} true when this node is a text node, false otherwise.
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* @this {Node}
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* @private
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*/
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function textNodeFilter() {
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return this.nodeType === 3;
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}
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/**
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* Add target selector to hash of target selectors. If this is the first target selector added, start the live
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* updater.
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*
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* @param {string} targetSelector the target selector to run the live updater for.
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* @param {Object.<string, string>} settings the settings to apply on this target selector.
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* @private
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*/
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function addToLiveUpdater(targetSelector, settings) {
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// Store target selector with its settings.
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liveUpdatingTargetSelectors[targetSelector] = settings;
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// If the live updater has not yet been started, start it now.
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if (!liveUpdaterIntervalId) {
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liveUpdaterIntervalId = window.setInterval(function() {
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doLiveUpdater();
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}, 200);
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}
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}
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/**
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* Remove the target selector from the hash of target selectors. It this is the last remaining target selector
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* being removed, stop the live updater.
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*
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* @param {string} targetSelector the target selector to stop running the live updater for.
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* @private
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*/
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function removeFromLiveUpdater(targetSelector) {
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// If the hash contains the target selector, remove it.
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if (liveUpdatingTargetSelectors[targetSelector]) {
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delete liveUpdatingTargetSelectors[targetSelector];
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// If no more target selectors are in the hash, stop the live updater.
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if (!liveUpdatingTargetSelectors.length) {
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if (liveUpdaterIntervalId) {
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window.clearInterval(liveUpdaterIntervalId);
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liveUpdaterIntervalId = undefined;
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}
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}
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}
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};
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/**
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* Run the live updater. The live updater is periodically run to check if its monitored target selectors require
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* re-applying of the ellipsis.
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*
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* @private
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*/
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function doLiveUpdater() {
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// If the live updater is already running, skip this time. We only want one instance running at a time.
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if (!liveUpdaterRunning) {
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liveUpdaterRunning = true;
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// Loop through target selectors.
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for (var targetSelector in liveUpdatingTargetSelectors) {
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$(targetSelector).each(function() {
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var containerElement, containerData;
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containerElement = $(this);
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containerData = containerElement.data('jqae');
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// If container element dimensions have changed, or the container element is new, run ellipsis on
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// that container element.
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if ((containerData.containerWidth != containerElement.width()) ||
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(containerData.containerHeight != containerElement.height())) {
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ellipsisOnElement(containerElement, liveUpdatingTargetSelectors[targetSelector]);
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}
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});
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}
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liveUpdaterRunning = false;
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}
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};
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})(jQuery); |