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[英]Is there a way to get a reference to all the paragraphs or headings in a web page in JavaScript?
[英]Converting all headings of a page into a list
现在,我正在使用一些非常基本的jQuery(不要讨厌我)。 我的目标是将页面的每个h3 / h4标头转换为列表,以进行“自创建”侧边栏导航。
例如:
<h3>This is a header</h3>
<h4>This is its subheader</h4>
<p>Here's some explanation.<p>
<h4>This is another subheader</h4>
<p>Here's some explanation.<p>
<h3>Here is a new header</h3>
<h4>With</h4>
<p>Here's some explanation.<p>
<h4>some</h4>
<p>Here's some explanation.<p>
<h4>other</h4>
<p>Here's some explanation.<p>
<h4>subheaders</h4>
<p>Here's some explanation.<p>
成:
<ul>
<li>This is a header
<ul>
<li>This is its subheader</li>
<li>This is another subheader</li>
</ul>
</li>
<li>Here is a new header
<ul>
<li>With</li>
<li>some</li>
<li>new</li>
<li>subheaders</li>
</ul>
</li>
</ul>
到目前为止,我所做的是:
//Selecting all existing Headers and Subheaders of the content wrapper
var headers = $('.some-text-wrapper h3, .some-text-wrapper h4');
//Placing them into a new div (later sidebar)
$('#headings').html(headers);
//Looping through each element trying to replace the tags
$('#headings h3, #headings h4').each(function(){
if ( $(this).is(':first-child') ) {
$(this).replaceWith('<ul><li>' + $(this).html() +'<ul>')
} else if ( $(this).prop("tagName") == 'H3' ) {
$(this).replaceWith('</ul></li><li>' + $(this).html() +'<ul>')
} else {
$(this).replaceWith('<li>' + $(this).html() +'</li>')
}
});
不幸的是,我最终遇到了一些麻烦,例如:
<ul>
<li>This is a header
<ul></ul>
</li>
</ul>
<li>This is its subheader</li>
当涉及到h3标题时,我就没有继续进行整理标签等的工作。我不知道ul / li标签的自动关闭是由jQuery替换还是由Wordpress引起的(有些自动关闭标签的问题)。
我知道我可以简单地使用创建的h3 / h4元素并将它们设置为列表样式,但这并不是我真正想要的。 无论如何,我有兴趣为此寻找解决方案。
提前致谢。
您可以使用jquery的nextuntil
( https://api.jquery.com/nextUntil/ )并将其传递给选择器和过滤器以创建适当的列表。
var output = ""; $("h3").each(function(){ output += "<li>" + $(this).text() + "</li>"; if($(this).next("h4").length > 0){ output += "<ul>"; $(this).nextUntil("h3","h4").each(function(){ output += "<li>" + $(this).text() + "</li>"; }); output += "</ul>"; } }); $("#list").html(output);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <h3>This is a header</h3> <h4>This is its subheader</h4> <p>Here's some explanation.<p> <h4>This is another subheader</h4> <p>Here's some explanation.<p> <h3>Here is a new header</h3> <h4>With</h4> <p>Here's some explanation.<p> <h4>some</h4> <p>Here's some explanation.<p> <h4>other</h4> <p>Here's some explanation.<p> <h4>subheaders</h4> <p>Here's some explanation.<p> <div id="list"><ul></ul></div>
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