Web Scraping 101: Tackle Pagination for Web Scraping
Friday, October 12, 2018
Pagination is a widely used technique in web designing that splits content into various pages, thus presenting large datasets in a much more easily digestible manner for web surfers.
There is a lot of pagination methods employed by different web developers, such as numbered pagination, infinite scrolling, etc. Although pagination is generally believed to improve user experience, the bad news is that it makes web scraping more difficult.
If you’re trying to scrape data from a website and are facing a dilemma about how to tackle pagination for web scraping, we have you covered. Octoparse, an automatic web scraping tool, supports dealing with websites of various pagination structures. Now we are going to illustrate the various approaches for how to deal with different kinds of pagination with Octoparse, which includes:
Clicking on the next button to paginate is perhaps one of the most commonly used methods for pagination, making it easy for visitors to traverse through pages on the website. It is very simple to handle this kind of pagination for web scraping in Octoparse.
No matter if it is a next button shown in the form of the word - "Next" or just a right arrow – ">", you only need to build a pagination loop to keep clicking on the button after scraping is done with the current page. (Check an example here )
2. Numbered pagination without "Next" button
The approach for this particular kind of pagination is very similar to that with the next button. You want to build a pagination loop to keep clicking the next page number down the line. However, since this one you won't be clicking on a static element, locating the next page number precisely is critical.
Octoparse uses XPath (XML Path Language, which uses "path like" syntax to identify and navigate nodes in an XML document) for locating any elements. So the key point here is to modify the XPath of the pagination loop to make sure it will always locate the next page number as soon as the current page's been fully scrapped (check this tutorial for how to modify the XPath to accurately locate the next page number)
3. Infinite scrolling
Octoparse deals with infinitive scrolling by mimicking the scrolling behavior. Depending on the amount of content you want to load, simply set up the appropriate scroll time and scroll way, you will have the page scrolled automatically (check an example here )
4. "Load More" button
Load more button kind of navigation is another popular alternative to infinite scrolling. In this case, you would have a specific button, like "Load More", to trigger the content loading with AJAX as you reach the bottom of the page.
Octoparse deals with "Load More" button with a pagination loop, which is the same as how we deal with "Next" button, by clicking on one single button repeatedly. The difference though is that with "Load More" button, we need to have the pagination loop run till the load button disappears before proceeding to the next step. After all the desired content gets loaded, the scraping process is as easy as scraping one single page (check more details here )
Pagination reduces page complexity and improves readability of web content, yet it needs to be tackled using various approaches, whichever that creates maximum efficiency. If we fail to deal with pagination properly, it will result in missing data and a waste of time. Making good use of a web scraping tool like Octoparse, you can avoid the complexities of web scraping!
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