Question

我正在试图弄清楚如何截断第一段，我试过了：

$div.children( ('p:eq(0)').substring(0,100)); 
$div.children( ('p:eq(0)'.substring(0,100)));

但两个都没有奏效......

这是完整的代码（有人在这帮助我！）

$j('#hp-featured-item > div[id^="post-"]').each(function() {
        var $div = $j(this),
                $h2  = $div.find('h2:first'),
                $obj = $div.find('object, embed, img').filter(':first'),
                id   = this.id.match(/^post-([0-9]+)$/);

        if( $obj.size() > 0){
                // Find parent
                var $par = $obj.closest('p');


                // Move to top of div
                $obj.prependTo($div);

                // Remove the now empty parent
                $par.remove();

                if( $obj.is('img')){
                        // You can't wrap objects and embeds with links, so make sure we just wrap images
                        $obj.wrap( $j('<a></a>').attr('href', '/blog/?p='+id[1]));
                }
        }

        // Wrap the contents of the h2, not the h2 itself, with a link
        $h2.wrapInner( $j('<a></a>').attr('href', '/blog/?p='+id[1]) );
        $div.children( ('p:eq(0)').substring(0,100));
        $div.children('p:gt(0)').remove();

});

Answer 1

这应该有效：

$fC = $div.children("p:first-child");
$fC.html($fC.html().substring(0, 100));

经过测试：它对我有用。我的模拟代码：http://pastebin.com/f737f7ce9

<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script>
</head>
<body>

<div>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
<p>It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like).</p>
</div>

<div>
<p>Integer ut sapien vitae orci vehicula mattis at eget lacus. Duis enim purus, sagittis nec euismod vitae, laoreet sit amet augue. Sed lacus risus, congue ac cursus et, consectetur at erat. Vestibulum lobortis tincidunt risus, in malesuada lacus ultrices et. Nulla commodo lectus pharetra purus pulvinar auctor. Duis urna felis, consequat ac facilisis id, ultrices ac tellus. Aliquam id semper dolor. Aenean eu augue augue. Vestibulum a elit turpis. Sed sed dignissim augue. Maecenas malesuada aliquet mi, sit amet facilisis quam posuere ut. Nulla luctus nulla vitae est vehicula mattis. Sed in nisi ac urna egestas condimentum. Nulla facilisi. Proin sit amet justo purus. </p>
<p>Vestibulum ut elit neque, eget blandit nulla. Mauris tortor nulla, tincidunt gravida placerat vel, iaculis nec ipsum. Donec sed quam massa, at dignissim arcu. Sed porta mattis elementum. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. In hac habitasse platea dictumst. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Curabitur vel turpis eget urna eleifend egestas sit amet ut nibh. Integer vitae varius neque. Nullam leo libero, condimentum in mollis ut, ornare et nulla. Etiam at quam quis sapien rutrum porttitor. Ut pellentesque mi vitae odio pellentesque sagittis. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Phasellus a sapien nulla, a ultricies nibh. Curabitur lectus quam, rhoncus quis elementum a, congue auctor sem. </p>
</div>

<script type="text/javascript">//<!--

$(window).ready(function(){

$("div").each(function(){
var $div = $(this);
var $fC = $div.children("p:first-child");
$fC.html($fC.html().substring(0,100));
});

});

// --></script>

</body>
</html>

Answer 2

$div.children( ('p:eq(0)').substring(0,100));

看那条线。它取“p：eq（0）”的前100个字符并将其用作孩子的选择器。前100个字符本身就是它，所以没有结合。 thephpdeveloper 是对的，你想要innerHTML。但是，如果段落中包含HTML作为内容，则您不希望拆分标记。所以请改用text。

var truncatedText = $div.children('p').eq(0).text().substring(0, 100);
$div.empty().append(jQuery("<div/>").text(truncatedText));

另外，为什么所有变量都以$开头？这通常是为重要的系统级变量保留的。

Answer 3

由于我非常感谢这篇文章及其巨大的帮助，我正在分享一个很酷的修改。

如果少于10个字符，此代码将阻止追加，并有条件地使用“工具提示”。

<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"
        type="text/javascript"></script>
<script type="text/javascript">//
$(window).ready(function(){
    $("div").each(function(){
        $("#div2").hide();

        var $div = $(this);
        var $fC = $div.children("p:first-child");

        //show hide functions in vars
        var fn1 = function(){ $('#div2').show();};
        var fn2 = function(){ $('#div2').hide();};

        $("#div2").hide();

        ///conditional
        if ($fC.text().length > 10) 
        {
            $fC.html($fC.html().substring(0,14));

            ($fC).append("[...]");
            //show hide
            ($fC).mouseover(fn1).mouseout(fn2);
        }
    });
});
</script>
</head>
<body>

<div>
<p>first really long line</p>
<p>UNTOUCHED 2nd child</p>
</div>

<div>
<p>1111 </p>
<p>UNTOUCHED 2nd child</p>

</div>

<div id="div2">full text in tooltip content here will probably be
an ajax call or something</div>

</body>
</html>

用于截断文本的子串？

3 个答案: