#htmlagilitypack

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.Net Core | MVC | HTML Agility Pack | SQL | Technology Crowds: Phishing: Google applies new tactics to prevent Phishing on Chrome

Know what new tactics are applied by Google to tight security and prevent Phishing and hacking on Chrome.

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Here demonstrated very well how to search specific text from HTML (Web Page) using HTML Agility Pack C#, below steps followed:

 Step 1: Define html Document

 Step 2: Declare HTMLWeb

 Step 3: Loading document for specific URL

 Step 4: Searching for specific word in HTML Document 

Step 5: Finally, displayed final output

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Vital Impact of Corona Virus on IT Industries and Recruitment Firms

Introduction

The results of COVID-19 are having a big effect on IT Industries , affecting raw substances supply, disrupting the electronics value chain, and inflicting an inflationary risk on products.The Indian economy has taken quite a hiatus but there is a silver lining (it may come late but it will definitely).

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Learn How to Do HTML Manipulation by HTML AGILITY PACK

HTML Agility Pack is one of the best tools to do Web Scraping. It is a Free and open source library used to parse HTML documents. In this world of dynamic HTML requirements ,now it is very much required to manipulate the HTML content according the requirements of clients.

[ducnghiatq]

A few things that will help you when working with HtmlAgilityPack and XPath expressions.

If run is an HtmlNode, then:

1. run.SelectNodes("//div[@class='date']") Will will behave exactly like doc.DocumentNode.SelectNodes("//div[@class='date']")

2. run.SelectNodes("./div[@class='date']") Will give you all the <div> nodes that are children of run node. It won't search deeper, only at the very next depth level.

3. run.SelectNodes(".//div[@class='date']") Will return all the <div> nodes with that class attribute, but not only next to the run node, but also will search in depth (every possible descendant of it)

[aloisdg]

Get content from a webpage or "How to Scrape the Sky"

Sometimes you may want something on a webpage or a lot things. If you can get it on a browser, you can get it everywhere. We call it web scraping. When you scrape, you just take the stuff you want. Basically, we are building your own API. If you source expose an API, use it. We are reading a page, if the page change we have to change too. An API is the direct source to the content. Safe drinking water starts at the source.

Well, imagine there is no Tumblr API and you want every title of this blog's front page. So you can't use /api/read nor /rss, what could you do ? Let's see.

We want to access to the webpage. A webpage is a content wrapping in a strange, gloomy, odd language called HTML. To parse it, there is a lot of solution. One is to use a strangest, gloomiest, oddest language called Regex. Let's do it. No, I am joking. By the way, you should read this thread from StackOverflow when you will finish to read this article. To get our content from the page we will use XPath and the HtmlAgilityPack.

XPath

XPath allow us to navigate around our webpage. We aim our content with it. Every modern browser get XPath as a built-in feature. I use a Chrome extension called XPath Helper to enhance this feature. You can download XPath Helper on the Chrome WebStore. If you are looking for a vanilla solution you can write $x("query") on the debug console and get the query from the Inspect Element tool.

If you are asking yourself how to use "XPath Helper", just follow instructions form the extension :

Open a new tab and navigate to your favorite webpage.

Hit Ctrl-Shift-X to open the XPath Helper console.

Hold down Shift as you mouse over elements on the page. The query box will continuously update to show the full XPath query for the element below the mouse pointer. The results box to its right will show the evaluated results for the query.

If desired, edit the XPath query directly in the console. The results box will immediately reflect any changes.

Hit Ctrl-Shift-X again to close the console.

I recommand you to play with the query in the console of XPath helper. You can learn more about the XPath Syntax on the MSDN, on Genius or with the RFC.

For example :

/html/body/div[@id='main']/div[@id='post'][2]/a/div[@class='title']

could be write

//div[@id='post'][2]/a/div[@class='title']

or like this to get each post's title of the page

//div[@id='post'][*]/a/div[@class='title']

Now, we have an XPath query. What to do with? We should ask to HtmlAgilityPack.

HtmlAgilityPack

So what is the HtmlAgilityPack (HAP) ? They present themself like this :

It is a .NET code library that allows you to parse "out of the web" HTML files.

And I have nothing to add. We are going to load a HTML page and parse the content we are looking for with our XPath query. To use HAP, we just have to install it from nuget.

There is a lot of example around the web about "how to use HAP?", here is mine :

var url = "http://aloisdg.tumblr.com/"; var query = "//div[@id='post'][.]/a/div[@class='title']"; HtmlDocument htmlDocument = new HtmlWeb().Load(url); foreach (var node in htmlDocument.DocumentNode.SelectNodes(query)) { // do something with node.InnerHtml Console.WriteLine(node.InnerHtml); }

The output is :

Exporter un visuel XAML en PNG Compiler du C# en ligne de commande sous Linux Générer une doc et un UML avec Doxygen et Graphviz Segoe UI alternatives Faire un Slider XAML complet en 5 petites étapes

You may want to decode this ~~ugly~~ html code. No need to code anything because .NET give you the method WebUtility.HtmlDecode().

The output with WebUtility.HtmlDecode() is :

Exporter un visuel XAML en PNG Compiler du C# en ligne de commande sous Linux Générer une doc et un UML avec Doxygen et Graphviz Segoe UI alternatives Faire un Slider XAML complet en 5 petites étapes

better isn't ?

Next stuff is up to you. Happy scraping.

PS : If you are looking for a solution without any code, you can check kimono or import.io. Another solution is to use Selenium.

[jmhenriquez]

Cool HTML parsing with HtmlAgilityPack

Today comes this guy from the press department to tell me that his job is to collect news related to our ministry and that I was supposed to help him.... But none of that matters now, what is important is what I'm going to talk about.

Have you ever parsed HTML? I did it like three, or four, years ago and it was sad. Thankfully, is not the same in the present time. Introducing...

HtmlAgilityPack

This is an agile HTML parser that builds a read/write DOM and supports plain XPATH or XSLT (you actually don't HAVE to understand XPATH nor XSLT to use it, don't worry...). It is a .NET code library that allows you to parse "out of the web" HTML files. The parser is very tolerant with "real world" malformed HTML. The object model is very similar to what proposes System.Xml, but for HTML documents (or streams).

After downloading the HtmlAgilityPack

Parsing code is as simple as:

// Creating a HtmlDocument HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument(); // You can pass a string containing the HTML you want to parse doc.LoadHtml(/* myStringWithHtmlContent */); // Or you can use the Load method to pass the content in a different medium doc.Load(/* A String holding the path to the html file */); doc.Load(/* A TextReader */); doc.Load(/* A Stream */); // If there ware any parsing errors you'll find them in the ParseErrors property. IEnumerable errors = doc.ParseErrors; // After this, we access the document root node to start moving through the document var root = doc.DocumentNode; // Using this object's helper methods we can search (using XPath) or write to the document root.SelectNodes(/* Return elements matching the expression */); root.SelectSingleNode(/* Will try to return a single element */);

Quite easy, I had some issues before with the XPath language, but that was solved. To learn more about the language you can check at W3School.com, they have very useful documentation.

In conclusion I supposed I was going to suffer a little more while fulfilling this guy's desires but instead it was kind of cool. The HtmlAgilityPack is a wonderful tool and one that should be close to your belt. Sad there is very little official documentation, but there is still information spread across the galaxy.