使用 getelementbytag() 从 jsoup 中的 html 获取数据时出错

Question

Hi I am trying to get data using crawling from html given below I got the entire html by following

Elements b= doc.getElementsByClass("a");

Then for getting the value from tr tag I used

 Elements tr = b.getElementsByTag("tr");

But it shows the error as T he method getElementsByTag(String) is undefined for the type Elements

I want to get the values for tr tag please help me in it. The html which i am working is given below,

 <table class="a"> <thead> <tr> <td>the<br>boy</td> <td>ran<br>well</td> <td>the<br>boy</td> <td>ran<br>well</td> </tr> </thead> <tbody> <tr> <td>6</td> <td>1</td> <td>1</td> <td>1</td> </tr>

Answer 1

It's not clear what we are talking about, java or javascript.

But instead of fetching first the elements with className a and then iterating over the result to fetch the elements with tagname tr you may fetch the <tr/> 's with a single statement.

In javascript the method would be querySelectorAll :

var tr = document.querySelectorAll(".a tr");

In jsoup(I'm not familiar with java/jsoup, so that's just a guess) exists a method select

Elements tr = doc.select(".a tr");

Answer 2

To get html elements using class and tag names

Use below code.

var a= document.getElementsByClassName("a");
var b= document.getElementsByTagName("tr");

It should work :-)