Vba web scraping chrome


  • How to Search on Google using a VBA Code
  • VBA Code – To extract data – From website to Excel Macro
  • Excel Selenium Web Scraping Error 33
  • www.makeuseof.com
  • Data Scraping using Excel VBA and Selenium
  • Using Excel VBA and Selenium
  • How to Search on Google using a VBA Code

    Be aware the all these tools have their setbacks and most of the times it might actually turn out that doing it yourself is much easier. Looking to read more on Web Scraping Tools? Before we jump to the basic web scraping techniques in this Web Scraping Tutorial you need to understand how webpages exchange data with servers.

    Feel free to read more here. Servers can exchange data synchronously or asynchronously. The first, most popular, means that when you type in an URL in your browser or navigate over the website the browser will send a request to the server to load a certain URL e.

    Asynchronous server calls happen without a need to refresh the whole web page e. The latter method is sometimes also referred to as AJAX. Knowing what happens in the backend of the website can sometimes really make web scraping a lot easier and faster. I will dive deeper into this near the end of this article. They are therefore not visible in the URL. Websites are mostly HTML text files therefore being able to manipulate and extract text from them is a must-have capability.

    String manipulation The basic functions every Web Scraper needs to know are the following VBA : Len — returns the length of a certain string InStr Python: find, C : IndexOf — finds a substring in a certain string and returns its index Left — returns a given amount of characters from the left of a given string Right — returns a given amount of characters from the right of a given string Mid — returns a given amount of characters from any position within a given string Replace — replaces any occurrence s of a certain string in a given string That is it.

    Want an example? Now why not benefit from this simple finding? HTML tags can also have attributes. If you want to learn more on HTML this is a good place to start: here. CSS selectors are said to be faster and more simple than XPath. Want to be a Web Scraper pro? Use CSS selectors! I personally often prefer using regex other the previous two methods as in one go you can extract any pattern of text within a HTML page, whereas XPath and CSS selectors require usually at least 2 or more steps e.

    Excel Scrape HTML Tool Excel is a great tool for beginner coders, due to its ubiquity and, as it includes both a developing and testing environment. I myself use Excel on a daily basis and so do you most probably.

    Therefore I want to introduce a simple Web Scraping Add-In that basically allows you to extract text and data off almost any static web site. The is no need of writing even a single line of VBA code, although… you will need to learn how to write regular expressions.

    It is often used in AJAX websites. If you see the website being refreshed without it being reloaded an XMLHttpRequest object was most definitely used to exchange data with the server. Knowing this object is a must for all Web Scrapers unless you use Scrapy or other libraries. You can use ResponseText to extract all the web content you need. The XMLHttpRequest object is often all you need to extract the content from websites, web server calls etc.

    Resorting to simulating user interaction is often an overkill used by beginner Web Scrapers who are often to lazy to analyze the underlying Javascript and web server calls. However, when in need of scraping a collection of static websites or a certain subset of webpages on a website you may be in need of a Web Crawler i.

    Writing your own solution is always an option. It makes sense, however, to reach out for ready solutions like Scrapy. I will not elaborate more on Scrapy as I encourage you to check out this simple tutorial: Scrapy Tutorial. Simulating Web browser user interaction Now we finally reached the much appreciated methods for simulating user interaction. Because they are often misused these methods should be the last resort in case all other methods for scraping HTML content fail e.

    The Excel Internet. Explorer object in Excel VBA is a popular technique for leveraging the Internet Explorer web browser for simulating user interaction. Again I can recommend this approach for those who want to learn Web Scraping via Excel. Application" IE. Busy 'We need to wait until the page has loaded Application. Click 'Click the search button Using the Internet.

    Explorer object has some benefits e. For more elaborate solutions it is even possible to inject Javascript and load external JS libraries. The Internet. Explorer objects has some setbacks e. Busy is false it does not necessarily mean that the page has been fully loaded. You can download the file from here. Unfortunately the Internet. This is an issue on some web pages which will not respond until an appropriate JS event is fired. One way of going around this issue is simulating Excel keydown events e.

    Here is where Selenium can help… Selenium Selenium is an elaborate solution designed for simulating multiple different browsers ranging from IE to Chrome. It was designed both for Web Scraping and building test scenarios for Web Developers. Selenium is available in many programming environments C , Java, Python. I personally prefer python as there is not that much need for Objective Oriented Programming when building most Web Scrapers.

    Chrome 'Chrome must be installed! Other browser drivers are available driver. Although there are many webdrivers available in Selenium I would encourage you to use PhantomJS for final solutions and any other webdriver for testing as PhantomJS is an invisible browser — that is the point.

    Selenium is easy to learn learning curve similar as the vba Internet. Explorer object and selenium code can be easily migrated to C , Java and other languages which is a real advantage.

    Analyzing Javascript and network connections The methods above basically cover most popular Web Scraping techniques. Knowing all of them basically guarantees that you will be able to scrape and crawl any website, whether static or dynamic, whether using POST or GET or requiring user interaction. As I mentioned above often Web Scrapers settle for the easy approach — simulating user interaction.

    Beginner Web Scrapers will always prefer copying user interaction, sometimes even being to lazy to inject it via Javascript and doing it on a topmost visible web browser window. The approach below explains how you should leverage all the tools mentioned above in order to optimize your Web Scraping solution.

    F12 because basically when you hit F12 on most browser windows they will pop-up. I personally prefer the IE Developer Tool window as it lacks the complexity of the other tools and is a little easier to navigate. This is one of the most frequently used features, however, as a Web Scraper you need to also learn to Network tab similar name in Chrome.

    This is where the magic happens, often neglected by most Web Scrapers. However, in many cases modern webpages utilize web service calls or AJAX calls. These will be immediately visible on the Network tab. Example When inputing some text to the search box the page will suggest some answers during input: As you need not refresh the webpage this obviously must mean that there are asynchronous web calls going on in the background.

    Never fear F12 is here! Open the Network tab and hit Start Capturing. Next start inputing some text and viola — see the web calls appearing in the Network tab. Seems like the tool is right — this is definitely JSON, although containing encoded HTML strings as some of the suggested results are to be formatted differently.

    Knowing this you can already easily build a Web Crawler that can traverse through most of the resources of this page looking for similar search results. How can we use this information to leverage these web calls? No IE objects, selenium etc. Just some basic research and with just a few lines of codes you have the Allegro suggestion web service at your service :.

    The approach As you probably are already aware the approach basically requires doing some research on the website which you intend to scrape instead of immediately resorting to user interaction simulating techniques like Selenium. I always proceed as follows: Analyze the web page HTML — verify which controls are used for input and which for user interaction submitting the form.

    Analyze network calls — is the data you need to scrape contained in the HTML output of the web page or is it returned in a separate web service call preferred. Simple web service calls are a blessing for every Web Scrapers. They significantly reduce the time needed to extract the data you need.

    Even if there are no web service calls and the data is returned within the HTML response body of the web page. They are just as simple as GET! User interaction required — once every now and then there will be a tough nut to crack.

    This is indeed the time for Selenium or the IE object depending on your working environment. Want to earn money as a professional Web Scraper? Web Scraping is an honest way of making actual money in a repeatable manner by selling scraped data, making online Internet analyses or simply taking freelance web-scraping jobs.

    Ok, I know how to scrape data. What now? If you want to earn money by selling Internet data or taking freelance Web Scraping jobs — sign-up to one of these popular Freelance job websites:.

    VBA Code – To extract data – From website to Excel Macro

    We had a forum question asking how to do exactly that so I tried using the same approach as I had previously with the HTML Object Library, but when it came to grabbing elements from the web page, the results were inconsistent. Sometimes I'd get what I wanted, sometimes not.

    You can write code that instructs Selenium to do things like open a web page, fill in a form, or click a button, and it's really easy to use. SeleniumBasic supports a smaller range of browsers than the full Selenium implementation, I chose to use Chrome. Please note that up to date versions of Firefox are not supported, and you will need to downgrade to a much older version of FF if you really want to use it.

    Run the. Installing ChromeDriver You need to install the version of ChromeDriver that matches your installed version of Chrome. I have version Get the version of ChromeDriver that matches your version of Chrome from here.

    You just need to match the major version number i. Download and unzip the version that works with your operating system. I'm running Windows 10 Pro bit so the win32 file is the one I want. Unzipping will give you just one file chromedriver. In doing this you will be copying over the version of chromedriver. It will be different for you and will depend on what version of Windows or other OS you are using.

    Then click the OK button. You can now write VBA that accesses Selenium. The result gives us various information, but we are only interested in the company name, and need to extract that from the web page and put it into Excel. We have a list of VAT numbers on our sheet and want to automate the process of looking up the company name associated with each one. Interacting With A Web Page In order to do something like fill in a form or extract data from a web page, we need to understand the structure of the web page.

    If you put your mouse pointer over the Member State dropdown and right click, then click Inspect, the Inspector window will highlight the HTML that creates this dropdown. Notice that the highlighted element has an id countryCombobox.

    We'll need that later. If we right click on the top most VAT number box, and Inspect that you'll find it has an id called number. We'll remember that for later too. The last thing we need to look at on this page is the Verify button. Store that id for later use too. If we now look at the results page, we are interested in the company name. Notice here that the element storing the company name doesn't have an id, so we'll have to use another way to identify it in our VBA so we can get the name into Excel.

    Read more about using XPath in Selenium. You can use various tag names or attributes to indicate what piece of information you want. In this case, we are after some text in a HTML table. Note that there is only 1 table in the results page HTML. If there were more I'd have to specify which table I wanted by using, for example, table[1] etc. I'm using a variable called count to keep track of what row I'm on.

    Next the code tells Selenium to Get load the website. The next 3 lines use a method called FindElementById to interact with the bits of the web page we found earlier using the Inspector. Using the SendKeys method you can send keystrokes or text to the selected element. Finally the code Clicks on the submit element the Verify button. The results page will now load and we can get the company name with this line, and store it in a cell in Column B. So if count has reached 3, we store the company name in B3.

    Repeat the process until all the VAT numbers have been checked. Download the Example Workbook Get a copy of the code used in this post.

    Enter your email address below to download the workbook. Get Workbook By submitting your email address you agree that we can email you our Excel newsletter. Please enter a valid email address. Download the workbook. Note: This is a. Please ensure your browser doesn't change the file extension on download. Summary Once you get everything installed, using Selenium is pretty easy. I've used it to fill in just a couple of things in a form, but it would not be hard to expand on this to complete more complicated forms, even over several pages.

    More Web Scraping Posts.

    Excel Selenium Web Scraping Error 33

    Next, you need to enable the Selenium Wrapper by clicking on the Tools menu, then click on "References", and then browse down to the reference called "SeleniumWrapper Type Library".

    Check that reference box and then click OK. You're now ready to start writing browser automation code using the Selenium Wrapper! You can see just how much is available beyond just the WebDriver, by defining the Selenium object as "New SeleniumWrapper".

    When you type the period, it'll drop down all of the elements of the types of objects you can control, like browser images, PDF files, keyboard keys, and more. This example code will be using the WebDriver. Once you use the Selenium WebDriver object in your code and type the period, it'll drop down a very long list of methods and properties that you can use to automate your web browser. It can take some time to learn everything that's available, but Google can turn up some good examples, behind the samples available at the Google Code page.

    www.makeuseof.com

    Unfortunately, as far as I know, there's no straightforward guide out there for using Selenium, but I would be grateful of any readers that could provide any resources!

    I then created the button as described in the first part of this article. The code behind the button is straightforward, but I'm going to explain what each section does. Chrome 'Chrome must be installed! Other browser drivers are available driver. Although there are many webdrivers available in Selenium I would encourage you to use PhantomJS for final solutions and any other webdriver for testing as PhantomJS is an invisible browser — that is the point.

    Selenium is easy to learn learning curve similar as the vba Internet. Explorer object and selenium code can be easily migrated to CJava and other languages which is a real advantage.

    Data Scraping using Excel VBA and Selenium

    Analyzing Javascript and network connections The methods above basically cover most popular Web Scraping techniques. Knowing all of them basically guarantees that you will be able to scrape and crawl any website, whether static or dynamic, whether using POST or GET or requiring user interaction.

    As I mentioned above often Web Scrapers settle for the easy approach — simulating user interaction. Beginner Web Scrapers will always prefer copying user interaction, sometimes even being to lazy to inject it via Javascript and doing it on a topmost visible web browser window. The approach below explains how you should leverage all the tools mentioned above in order to optimize your Web Scraping solution.

    F12 because basically when you hit F12 on most browser windows they will pop-up.

    Using Excel VBA and Selenium

    I personally prefer the IE Developer Tool window as it lacks the complexity of the other tools and is a little easier to navigate. This is one of the most frequently used features, however, as a Web Scraper you need to also learn to Network tab similar name in Chrome.

    This is where the magic happens, often neglected by most Web Scrapers. However, in many cases modern webpages utilize web service calls or AJAX calls. These will be immediately visible on the Network tab.

    Example When inputing some text to the search box the page will suggest some answers during input: As you need not refresh the webpage this obviously must mean that there are asynchronous web calls going on in the background. Never fear F12 is here! Open the Network tab and hit Start Capturing.

    Next start inputing some text and viola — see the web calls appearing in the Network tab. Seems like the tool is right — this is definitely JSON, although containing encoded HTML strings as some of the suggested results are to be formatted differently.

    Knowing this you can already easily build a Web Crawler that can traverse through most of the resources of this page looking for similar search results.

    How can we use this information to leverage these web calls? No IE objects, selenium etc. Just some basic research and with just a few lines of codes you have the Allegro suggestion web service at your service :. The approach As you probably are already aware the approach basically requires doing some research on the website which you intend to scrape instead of immediately resorting to user interaction simulating techniques like Selenium.

    I always proceed as follows: Analyze the web page HTML — verify which controls are used for input and which for user interaction submitting the form. Analyze network calls — is the data you need to scrape contained in the HTML output of the web page or is it returned in a separate web service call preferred.

    Simple web service calls are a blessing for every Web Scrapers. They significantly reduce the time needed to extract the data you need. Even if there are no web service calls and the data is returned within the HTML response body of the web page. I remembered that I had created a directory for Selenium webdrivers and added it to the system path. I updated the driver to match the Chrome version and I still got the same runtime error. I then tried one of my Python scrapers and they worked!

    So my problem was with Excel. As I re-read the installation instructions I found that the driver needs to be placed in the same directory as the SeleniumBasic library, which for me was not the webdriver directory I had already updated.

    That was the difference.


    thoughts on “Vba web scraping chrome

    • 22.09.2021 at 17:17
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      This idea is necessary just by the way

      Reply

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