具有多个查询的Jsoup Select / Jsoup select内部是否有OR操作？

Question

I know that we can select multiple element by using:

doc.select("div.myclass > p,h2");  // select p or h2 inside myclass

But how can I select something like this :

doc.select("div.myclass > p, h2" || "div.myclass > p > a");// this is a fake function

I want to select both (p, h2) inside myclass and (p > a) inside myclass

If I only use

doc.select("div.myclass > p");

I cannot get the content of a inside p.

How can I do that?

Answer 1

Your assumption that doc.select("div.myclass > p,h2"); will select (next to p elements) only h2 elements that are direct children of a div with class myclass is not correct. The , operator in the Jsoup CSS implementation has precedence over the > operator. So in your example it will select all h2 elements, regardless of where it is in the DOM.

String html = ""
        + "<h2>header1</h2>"
        + "<div class=\"myclass\">"
        + "<h2>header2</h2>"
        + "    <p>p1</p>"
        + "    <div class=\"myclass2\">"
        + "    <p>p2</p>"
        + "    </div>"
        + "</div>"
        ;
Document doc = Jsoup.parse(html);
Elements els1 = doc.select("div.myclass > p,h2");
System.out.println(els1+"\n");
Elements els2 = doc.select("div.myclass > p, div.myclass > h2");
System.out.println(els2+"\n");

In the above example you can see for yourself, that the output of els1 will include the h2 element that is not child of the div .

To select all p elements that are inside the div.myclass , even if they are no direct children you can use the space operator:

Elements ps = doc.select("div.myclass p");

This will result in in the following output with the html from my example above:

<p>p2</p>
<p>p3</p>

Have a look at the JSoup documentation to get the meaning of other possible operators.