jquery - 如何使用 jQuery 从 获取前 2 行或 200 个字符

Question

我有一个大约 10 行的段落。我想在 2 行后显示阅读更多按钮。

如何使用 jQuery 获取某些字符的前两行？

有没有类似的功能

$('p').get(2lines);

Answer 1

试试这个；可能需要定制。

<script language="javascript">

    $.fn.truncate = function(options) {

        var defaults = {
            length: 300,
            minTrail: 20,
            moreText: "more",
            lessText: "less",
            ellipsisText: "..."
        };

        var options = $.extend(defaults, options);

        return this.each(function() {
            obj = $(this);
            alert(options.minTrail);
            var body = obj.html();
            if (body.length > options.length + options.minTrail) {
                var splitLocation = body.indexOf(' ', options.length);
                if (splitLocation != -1) {
                    // truncate tip
                    var splitLocation = body.indexOf(' ', options.length);
                    var str1 = body.substring(0, splitLocation);
                    var str2 = body.substring(splitLocation, body.length - 1);
                    obj.html(str1 + '<span class="truncate_ellipsis">' + options.ellipsisText +
                        '</span>' + '<span  class="truncate_more">' + str2 + '</span>');
                    obj.find('.truncate_more').css("display", "none");
                    // insert more link
                    obj.append(
                        '<div class="clearboth">' +
                        '<a href="#" class="truncate_more_link">' + options.moreText + '</a>' +
                        '</div>'
                    );
                    var moreLink = $('.truncate_more_link', obj);
                    var moreContent = $('.truncate_more', obj);
                    var ellipsis = $('.truncate_ellipsis', obj);
                    moreLink.click(function() {
                        if (moreLink.text() == options.moreText) {
                            moreContent.show('normal');
                            moreLink.text(options.lessText);
                            ellipsis.css("display", "none");
                        } else {
                            moreContent.hide('normal');
                            moreLink.text(options.moreText);
                            ellipsis.css("display", "inline");
                        }
                        return false;
                    });
                }
            }
        });
    };

    $().ready(function() {  
        $('.tip').truncate( {  
            length: 120,  
            minTrail: 10,  
            moreText: 'show more',  
            lessText: 'show less'  
        });  
    }); 
</script>

<div class="tip" style="width:200px;background-color:#ccc;padding:10px;">  
   Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam fringilla, purus a ultrices blandit, odio ante scelerisque neque, vitae imperdiet odio velit ac nisl. Sed tortor metus, placerat condimentum, feugiat in, feugiat adipiscing, mi. Donec pulvinar sem vitae leo. Vestibulum eget lectus et ligula hendrerit pharetra. Sed porta justo ac nisl. Aliquam nisi erat, pellentesque sed, sagittis eu, fringilla sit amet, dolor. Nam ac mi. Pellentesque pede purus, mattis aliquet, semper nec, cursus a, orci. Duis bibendum nibh ac massa. Integer eu tortor. Aenean convallis quam at nunc. Nunc mollis tincidunt nisi. Suspendisse mauris odio, iaculis ut, feugiat vitae, ultrices in, tortor. Quisque at elit. In hac habitasse platea dictumst.  
</div>