Since no one has done it already, I did a simple Angular directive for the awesome Trunk8 by Rick Viscomi. Note: It’s not thoroughly tested, and requires jQuery. I added a zero-timeout to allow the template to render before trunk8 is applied.
Usage:
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<span trunk8="{lines: 2}">Text </span> |
Settings (Default value):
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fill: '…', //The string to insert in place of the omitted text. This value may include HTML. lines: 1, //The number of lines of text-wrap to tolerate before truncating. This value must be an integer greater than or equal to 1. side: 'right', //The side of the text from which to truncate. Valid values include 'center', 'left', and 'right'. tooltip: true, //When true, the title attribute of the targeted HTML element will be set to the original, untruncated string. Valid values include true and false. width: 'auto', // The width, in characters, of the desired text. When set to 'auto', trunk8 will maximize the amount of text without spilling over. parseHTML: false, //When true, parse and save html structure and restore structure in the truncated text. responsive: false, //Truncate on window resize onTruncate: function(){} //Called after truncation is completed. |
Source code:
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(function(){ function trunk8() { var _directive = this, defaultSettings = { fill: '…', lines: 1, side: 'right', tooltip: true, width: 'auto', parseHTML: false, responsive: false, onTruncate: function(){} }, methods, utils, SIDES = { /* cen...ter */ center: 'center', /* ...left */ left: 'left', /* right... */ right: 'right' }, WIDTH = { auto: 'auto' }; function _trunk8(element) { this.$element = $(element); this.original_text = $.trim(this.$element.html()); this.settings = $.extend({}, defaultSettings); } _trunk8.prototype.updateSettings = function (options) { this.settings = $.extend(this.settings, options); }; function stripHTML(html) { var tmp = document.createElement("DIV"); tmp.innerHTML = html; if (typeof tmp.textContent != 'undefined') { return tmp.textContent; } return tmp.innerText; } function getHtmlArr(str) { /* Builds an array of strings and designated */ /* HTML tags around them. */ if (stripHTML(str) === str) { return str.split(/\s/g); } var allResults = [], reg = /<([a-z]+)([^<]*)(?:>(.*?(?!<\1>))<\/\1>|\s+\/>)(['.?!,]*)|((?:[^<>\s])+['.?!,]*\w?|<br\s?\/?>)/ig, outArr = reg.exec(str), lastI, ind; while (outArr && lastI !== reg.lastIndex) { lastI = reg.lastIndex; if (outArr[5]) { allResults.push(outArr[5]); } else if (outArr[1]) { allResults.push({ tag: outArr[1], attribs: outArr[2], content: outArr[3], after: outArr[4] }); } outArr = reg.exec(str); } for (ind = 0; ind < allResults.length; ind++) { if (typeof allResults[ind] !== 'string' && allResults[ind].content) { allResults[ind].content = getHtmlArr(allResults[ind].content); } } return allResults; } function rebuildHtmlFromBite(bite, htmlObject, fill) { // Take the processed bite after binary-search // truncated and re-build the original HTML // tags around the processed string. bite = bite.replace(fill, ''); var biteHelper = function(contentArr, tagInfo) { var retStr = '', content, biteContent, biteLength, nextWord, i; for (i = 0; i < contentArr.length; i++) { content = contentArr[i]; biteLength = $.trim(bite).split(' ').length; if ($.trim(bite).length) { if (typeof content === 'string') { if (!/<br\s*\/?>/i.test(content)) { if (biteLength === 1 && $.trim(bite).length <= content.length) { content = bite; // We want the fill to go inside of the last HTML // element if the element is a container. if (tagInfo === 'p' || tagInfo === 'div') { content += fill; } bite = ''; } else { bite = bite.replace(content, ''); } } retStr += $.trim(content) + ((i === contentArr.length-1 || biteLength <= 1) ? '' : ' '); } else { biteContent = biteHelper(content.content, content.tag); if (content.after) bite = bite.replace(content.after, ''); if (biteContent) { if (!content.after) content.after = ' '; retStr += '<'+content.tag+content.attribs+'>'+biteContent+'</'+content.tag+'>' + content.after; } } } } return retStr; }, htmlResults = biteHelper(htmlObject); // Add fill if doesn't exist. This will place it outside the HTML elements. if (htmlResults.slice(htmlResults.length - fill.length) === fill) { htmlResults += fill; } return htmlResults; } function truncate() { var data = this.data('trunk8'), settings = data.settings, width = settings.width, side = settings.side, fill = settings.fill, parseHTML = settings.parseHTML, line_height = utils.getLineHeight(this) * settings.lines, str = data.original_text, length = str.length, max_bite = '', lower, upper, bite_size, bite, text, htmlObject; /* Reset the field to the original string. */ this.html(str); text = this.text(); /* If string has HTML and parse HTML is set, build */ /* the data struct to house the tags */ if (parseHTML && stripHTML(str) !== str) { htmlObject = getHtmlArr(str); str = stripHTML(str); length = str.length; } if (width === WIDTH.auto) { /* Assuming there is no "overflow: hidden". */ if (this.height() <= line_height) { /* Text is already at the optimal trunkage. */ return; } /* Binary search technique for finding the optimal trunkage. */ /* Find the maximum bite without overflowing. */ lower = 0; upper = length - 1; while (lower <= upper) { bite_size = lower + ((upper - lower) >> 1); bite = utils.eatStr(str, side, length - bite_size, fill); if (parseHTML && htmlObject) { bite = rebuildHtmlFromBite(bite, htmlObject, fill); } this.html(bite); /* Check for overflow. */ if (this.height() > line_height) { upper = bite_size - 1; } else { lower = bite_size + 1; /* Save the bigger bite. */ max_bite = (max_bite.length > bite.length) ? max_bite : bite; } } /* Reset the content to eliminate possible existing scroll bars. */ this.html(''); /* Display the biggest bite. */ this.html(max_bite); if (settings.tooltip) { this.attr('title', text); } } else if (!isNaN(width)) { bite_size = length - width; bite = utils.eatStr(str, side, bite_size, fill); this.html(bite); if (settings.tooltip) { this.attr('title', str); } } else { $.error('Invalid width "' + width + '".'); return; } settings.onTruncate(); } methods = { init: function (options) { console.log(options); if( options.responsive ) { //Remove old listener if exists if( this.resizeFunction ) { window.removeEventListener('resize', this.resizeFunction); } this.resizeFunction = debounce(function() { this.each(function () { truncate.call($(this)); }); }, 250).bind(this); //Add new listener to window window.addEventListener('resize', this.resizeFunction); } var loop = this.each(function () { var $this = $(this), data = $this.data('trunk8'); if (!data) { $this.data('trunk8', (data = new _trunk8(this))); } data.updateSettings(options); //Make sure angular has finnished loading the content setTimeout(function(){ truncate.call($this); }); console.log($this); }); return loop; }, /** Updates the text value of the elements while maintaining truncation. */ update: function (new_string) { return this.each(function () { var $this = $(this); /* Update text. */ if (new_string) { $this.data('trunk8').original_text = new_string; } /* Truncate accordingly. */ truncate.call($this); }); }, revert: function () { return this.each(function () { /* Get original text. */ var text = $(this).data('trunk8').original_text; /* Revert element to original text. */ $(this).html(text); }); }, /** Returns this instance's settings object. NOT CHAINABLE. */ getSettings: function () { return $(this.get(0)).data('trunk8').settings; } }; utils = { /** Replaces [bite_size] [side]-most chars in [str] with [fill]. */ eatStr: function (str, side, bite_size, fill) { var length = str.length, key = utils.eatStr.generateKey.apply(null, arguments), half_length, half_bite_size; /* If the result is already in the cache, return it. */ if (utils.eatStr.cache[key]) { return utils.eatStr.cache[key]; } /* Common error handling. */ if ((typeof str !== 'string') || (length === 0)) { $.error('Invalid source string "' + str + '".'); } if ((bite_size < 0) || (bite_size > length)) { $.error('Invalid bite size "' + bite_size + '".'); } else if (bite_size === 0) { /* No bite should show no truncation. */ return str; } if (typeof (fill + '') !== 'string') { $.error('Fill unable to be converted to a string.'); } /* Compute the result, store it in the cache, and return it. */ switch (side) { case SIDES.right: /* str... */ return utils.eatStr.cache[key] = $.trim(str.substr(0, length - bite_size)) + fill; case SIDES.left: /* ...str */ return utils.eatStr.cache[key] = fill + $.trim(str.substr(bite_size)); case SIDES.center: /* Bit-shift to the right by one === Math.floor(x / 2) */ half_length = length >> 1; // halve the length half_bite_size = bite_size >> 1; // halve the bite_size /* st...r */ return utils.eatStr.cache[key] = $.trim(utils.eatStr(str.substr(0, length - half_length), SIDES.right, bite_size - half_bite_size, '')) + fill + $.trim(utils.eatStr(str.substr(length - half_length), SIDES.left, half_bite_size, '')); default: $.error('Invalid side "' + side + '".'); } }, getLineHeight: function (elem) { var floats = $(elem).css('float'); if (floats !== 'none') { $(elem).css('float', 'none'); } var pos = $(elem).css('position'); if (pos === 'absolute') { $(elem).css('position', 'static'); } var html = $(elem).html(), wrapper_id = 'line-height-test', line_height; /* Set the content to a small single character and wrap. */ $(elem).html('i').wrap('<div id="' + wrapper_id + '" />'); /* Calculate the line height by measuring the wrapper.*/ line_height = $('#' + wrapper_id).innerHeight(); /* Remove the wrapper and reset the content. */ $(elem).html(html).css({ 'float': floats, 'position': pos }).unwrap(); return line_height; } }; utils.eatStr.cache = {}; utils.eatStr.generateKey = function () { return Array.prototype.join.call(arguments, ''); }; $.fn._trunk8 = function (method) { if (methods[method]) { return methods[method].apply(this, Array.prototype.slice.call(arguments, 1)); } else if (typeof method === 'object' || !method) { return methods.init.apply(this, arguments); } else { $.error('Method ' + method + ' does not exist on jQuery.trunk8'); } }; //David Walsh | http://davidwalsh.name/javascript-debounce-function // Returns a function, that, as long as it continues to be invoked, will not // be triggered. The function will be called after it stops being called for // N milliseconds. If `immediate` is passed, trigger the function on the // leading edge, instead of the trailing. function debounce(func, wait, immediate) { var timeout; return function() { var context = this, args = arguments; var later = function() { timeout = null; if (!immediate) func.apply(context, args); }; var callNow = immediate && !timeout; clearTimeout(timeout); timeout = setTimeout(later, wait); if (callNow) func.apply(context, args); }; }; return { restrict: 'A', link: function(scope, element, attrs){ var settings = $.extend(defaultSettings,scope.$eval( attrs.trunk8)); $(element)._trunk8(settings); } }; } angular.module('myApp') .directive('trunk8', trunk8); })(); |