Simple example: Google search page.
http://www.google.com/search?q=foobar
When I get the source of the page, I get the underlying JavaScript. I want the resulting page. What do I do?
Even though it looks as if it is only javascript it really is the full HTML, you can easily confirm with HtmlAgilityPack:
HtmlAgilityPack.HtmlWeb web = new HtmlAgilityPack.HtmlWeb();
HtmlAgilityPack.HtmlDocument doc = web.Load("http://www.google.com/search?q=foobar");
string html = doc.DocumentNode.OuterHtml;
var nodes = doc.DocumentNode.SelectNodes("//div"); //returns 85 nodes
Related
I need to grab some posts from a blog. All went well until I've wanted to get the post creation date. The DOM-tree for it is:
div class="stories-feed__container"
-> article
-> div class="story__main"
-> div class="story__footer"
-> div class="story__user user"
-> div class="user__info-item"
-> time datetime="date and time in UTC format".
So I wrote the code:
HtmlWeb web = new HtmlWeb();
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc = web.Load("https://pikabu.ru/#serhiy1994");
string postDate = doc.DocumentNode.SelectSingleNode("//div[contains(#class, 'stories-feed__container')]/article[2]/div[contains(#class, 'story__main')]/div[contains(#class, 'story__footer')]/div[contains(#class, 'story__user user')]/div[contains(#class, 'user__info-item')]/time").GetAttributeValue("datetime", "NULL"); // e.g. for the 2nd article on the page
And it returns the NullReferenceException.
BUT if you stop at the "div class="story__user user"" level (e.g.,
string postDate = doc.DocumentNode.SelectSingleNode("//div[contains(#class, 'stories-feed__container')]/article[2]/div[contains(#class, 'story__main')]/div[contains(#class, 'story__footer')]/div[contains(#class, 'story__user user')]").InnerHtml;
it works properly and return you the inner HTML-code.
So I think there is something like 'maximum visibility level" for HtmlAgilityPack, and you won't able to manipulate with the deeper markdown.
Am I right or I'm coding something wrong?
The original page code is here: https://pastebin.com/jFC0XD9C
HtmlAgility will scrape the entire website, regardless of how deep you want to go. You can use this to get to the item you are looking for since you dont have to provide the entire path.
This will search the entire site and look for the first <div> tag that has the class name user__info-item. You can also change SelectSingleNode to SelectNodes if there are multiple tags then loop through them to get the dates.
HtmlWeb web = new HtmlWeb();
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc = web.Load("https://pikabu.ru/#serhiy1994");
var postDate = doc.DocumentNode.SelectSingleNode("//div[#class='user__info-item']/time");
Console.WriteLine(postDate.InnerText);
Whats wrong with your code?
Reason the code above you have doesnt work is because there is another div that you are missing, '<div class="user__info user__info_left">'.
If you write your code like this, it works.
var nodes = doc.DocumentNode.SelectSingleNode("//div[#class='story__main']/div[#class='story__footer']/div[#class='story__user user']/div[#class='user__info user__info_left']/div[#class='user__info-item']/time");
Console.WriteLine(nodes.InnerText);
Another way
Another way to do it is by searching for a parent div. Once you find the parent tag, search under that tag to find what you are looking for.
var nodes = doc.DocumentNode.SelectNodes("//div[#class='story__user user']");
foreach (HtmlNode node in nodes)
{
// Search within each node using .// notation
var timeNodes = node.SelectSingleNode(".//div[#class='user__info-item']/time");
Console.WriteLine(timeNodes.InnerText);
}
Tested Code here
I have a source html page and I want to do the following:
extracting a specific string from the whole html page and save the new choosing string in a new html page.
creating a database on MySQL with 4 columns.
importing the data from the html page to the table on MySql.
I would be pretty thankful and grateful if someone could help me in that cause I have no that perfect knowledge of using C#.
You could use this code :
HttpClient http = new HttpClient();
//I have put Ebay.com. you could use any.
var response = await http.GetByteArrayAsync("ebay.com");
String source = Encoding.GetEncoding("utf-8").GetString(response, 0, response.Length - 1);
source = WebUtility.HtmlDecode(source);
HtmlDocument Nodes = new HtmlDocument();
Nodes.LoadHtml(source);
In the Nodes object, you will have all the DOM elements in the HTML page.
You could use linq to filter out whatever you need.
Example :
List<HtmlNode> RequiredNodes = Nodes.DocumentNode.Descendants()
.Where(x => x.Attributes["Class"].Contains("List-Item")).ToList();
You will probably need to install Html Agility Pack NuGet or download it from the link.
hope this helps.
at the time I´m making a chatbot. The bot should be able to define a word, so I tried getting the span Element from Google (https://www.google.de/webhp?sourceid=chrome-instant&rlz=1C1CHBD_deDE721DE721&ion=1&espv=2&ie=UTF-8#q=define%20test) where the definition is writen in, wich didn't work. It turns out that the htmlDocument does not contain the hole website.
string Url = "https://www.google.de/webhp?sourceid=chrome- instant&rlz=1C1CHBD_deDE721DE721&ion=1&espv=2&ie=UTF-8#q=define%20test";
HtmlWeb web = new HtmlWeb();
HtmlDocument doc = web.Load(Url);
HtmlNode node = doc.DocumentNode.SelectSingleNode("//*[#id='uid_0']/div[1]/div/div[1]/div[2]/div/ol/li[1]/div/div/div[2]/div/div[1]/span");
if (!String.IsNullOrEmpty(node.InnerText))
output += node.InnerText;
node is not set to an Instance of an object
I let me give the InnerHtml of the document and put it in a gist: https://gist.github.com/MarcelBulpr/bb44a527d8202eb7fffb4e21fb8b4fed
it seems that the website does not load the result of the search request.
Does anyone know how to work around this?
Thanks in advance
I am trying to access these nodes
on this website.
http://bcres.paragonrels.com/publink/default.aspx?GUID=2033c143-cdf1-46b4-9aac-2e27371de22d&Report=Yes
however they appear to be in a secondary Html document within the initial one.
I am confused how I access the secondary html path and then parse through for the
this is an example of one of the nodes.
<div style="top:219px;left:555px;width:45px;height:14px;" id="" class="mls29">2</div>
I am using htmlAgility pack and I recieve null whenever I try to access Div.
I tried working my way down the nodes but It didn't work.
Any help or a place to look up the necessary information to figure this out would be appreciated
var webGet = new HtmlWeb();
var document = webGet.Load("http://bcres.paragonrels.com/publink/default.aspx?GUID=d27a1d95- 623d-4f6a-9e49-e2e46ede136c&Report=Yes");
var divTags = document.DocumentNode.SelectNodes("/html");
var text = document.DocumentNode.InnerText;
MessageBox.Show(text);
You will be able to scrape the data if you access the following url:
http://bcres.paragonrels.com/publink/Report.aspx?outputtype=HTML&GUID=2033c143-cdf1-46b4-9aac-2e27371de22d&ListingID=262103824:0&Report=Yes&view=29&layout_id=63
HtmlWeb w = new HtmlWeb();
var hd = w.Load("http://bcres.paragonrels.com/publink/Report.aspx?outputtype=HTML&GUID=2033c143-cdf1-46b4-9aac-2e27371de22d&ListingID=262103824:0&Report=Yes&view=29&layout_id=63");
var presentedBy = hd.DocumentNode.CssSelect(".mls23.at-phone-link");
if (presentedBy != null)
{
Console.WriteLine(presentedBy.FirstOrDefault().InnerText);
}
As an example, scraping the Presented By field:
Remarks:
I use ScrapySharp nuget package along with HtmlAgilityPack, so I can scrape using css selectors instead of xpath expressions - something I find easier to do.
The url you are scraping from is your problem. I am scraping from the last get request that is performed after the page is loaded, as you can see in the screenshot below, using Firefox developer tools to analyze the site traffic/network requests/responses:
I could not yet identify who/what triggers this http request in the end (may be by javascript code, may be via one of the frame htmls that are requested in the main document (the frame-enabled one).
If you only have a couple of urls like this to scrape, then even manually extracting the correct url will be an option.
I'm currently playing around with htmlagility pack, however, I don't seem to be getting any data back from the following url:
http://cloud.tfl.gov.uk/TrackerNet/LineStatus
This is the code i'm using:
var url = #"http://cloud.tfl.gov.uk/TrackerNet/LineStatus";
var webGet = new HtmlWeb();
var doc = webGet.Load(url);
However, when I check the contents of 'doc', the text value is set to null. I've tried other url's and i'm receiving the HTML used on the site. Is it just this particular url, or am I doing something wrong. Any help would be appreciated.
HtmlAgilityPack is an HTML parser, thus you won't be successful in trying to parse a non-HTML webpage such as the XML your want to parse.