由于使用css控制文字只显示多行,超出部分显示省略号,存在一定的兼容性问题,所以总结了一下网上一些大咖使用js实现控制行数的解决方案。
第一步:依次引入jquery.js+jquery.ellipsis.js+jquery.ellipsis.unobtrusive.js。
(1)jquery.js源代码下载 http://jquery.com/
(2)jquery.ellipsis.js 源代码
可以通过该部分修改默认的行数,修改row的值即可。
(function($) { $.fn.ellipsis = function(options) { // default option var defaults = { \'row\' :2, // show rows \'onlyFullWords\': false, // set to true to avoid cutting the text in the middle of a word \'char\' : \'...\', // ellipsis \'callback\': function() {}, \'position\': \'tail\' // middle, tail }; options = $.extend(defaults, options); this.each(function() { // get element text var $this = $(this); var text = $this.text(); var origText = text; var origLength = origText.length; var origHeight = $this.height(); // get height $this.text(\'a\'); var lineHeight = parseFloat($this.css("lineHeight"), 10); var rowHeight = $this.height(); var gapHeight = lineHeight > rowHeight ? (lineHeight - rowHeight) : 0; var targetHeight = gapHeight * (options.row - 1) + rowHeight * options.row; if (origHeight <= targetHeight) { $this.text(text); options.callback.call(this); return; } var start = 1, length = 0; var end = text.length; if(options.position === \'tail\') { while (start < end) { // Binary search for max length length = Math.ceil((start + end) / 2); $this.text(text.slice(0, length) + options[\'char\']); if ($this.height() <= targetHeight) { start = length; } else { end = length - 1; } } text = text.slice(0, start); if (options.onlyFullWords) { text = text.replace(/[\u00AD\w\uac00-\ud7af]+$/, \'\'); // remove fragment of the last word together with possible soft-hyphen characters } text += options[\'char\']; }else if(options.position === \'middle\') { var sliceLength = 0; while (start < end) { // Binary search for max length length = Math.ceil((start + end) / 2); sliceLength = Math.max(origLength - length, 0); $this.text( origText.slice(0, Math.floor((origLength - sliceLength) / 2)) + options[\'char\'] + origText.slice(Math.floor((origLength + sliceLength) / 2), origLength) ); if ($this.height() <= targetHeight) { start = length; } else { end = length - 1; } } sliceLength = Math.max(origLength - start, 0); var head = origText.slice(0, Math.floor((origLength - sliceLength) / 2)); var tail = origText.slice(Math.floor((origLength + sliceLength) / 2), origLength); if (options.onlyFullWords) { // remove fragment of the last or first word together with possible soft-hyphen characters head = head.replace(/[\u00AD\w\uac00-\ud7af]+$/, \'\'); } text = head + options[\'char\'] + tail; } $this.text(text); options.callback.call(this); }); return this; }; }) (jQuery);
(3)jquery.ellipsis.unobtrusive.js源代码
(function ($) { var $ellipsis = $.fn.ellipsis; $ellipsis.unobtrusive = { parseElement: function (element) { var $element = $(element); var maxWidth = $element.data(\'ellipsis-max-width\'); maxWidth = maxWidth ? parseInt(maxWidth) : 0; var maxLine = $element.data(\'ellipsis-max-line\'); maxLine = maxLine ? parseInt(maxLine) : 1; $element.ellipsis({ maxWidth: maxWidth, maxLine: maxLine }); }, parse: function (selector) { $(selector).find("[data-ellipsis=true]").each(function () { $ellipsis.unobtrusive.parseElement(this); }); } }; $(function () { var beginAt = new Date; if($ellipsis.debug){ console.log(beginAt); } $ellipsis.unobtrusive.parse(document); if($ellipsis.debug){ var endAt = new Date; console.log(endAt); console.log(endAt - beginAt); } }); }(jQuery));
第二步:需要一个装载内容的容器,并在其上添加属性data-toggle="popover",data-ellipsis="true",data-toggle的值可以定义成其他的值,只需后续与调用的js保持一致即可,例如、
<div style="width:400px">
<p class="aptitude-title" data-toggle="popover" data-ellipsis="true">JS控制文字只显示两行,超出部分显示省略号。</p>
</div>
建议添加一个外层容器,同时添加一个固定宽度。
第三步:调用方法
$(function () { $("[data-toggle=\'popover\']").popover(); });
代码搬运,记录过程,便于后续的工作和学习。