HTML Parsing - Check If Element Has Specific Attribute?
Dec 25, 2010
I'm using HtmlAgilityPack to parse HTML. I want to check if an element has a specific attribute. I want to check whether an <a> tag has the href attribute.
Dim doc As HtmlDocument = New HtmlDocument()
doc.Load(New StringReader(content))
Dim root As HtmlNode = doc.DocumentNode
Dim anchorTags As New List(Of String)
For Each link As HtmlNode In root.SelectNodes("//a")
If link.HasAttributes("href") Then doSomething() 'this doesn't work because hasAttributes only checks whether an element has attributes or not
Next
I have a webbrowser control with a static HTML page in it, i wanted to loop through each of the DIV items, and look at the class attribute within them. When i run my test, the class attribute is always blank? I know they have a class attribute i checked in my HTML
How can you find a specific HTML element in a webbrowser.document? I'm making a program that will go to a specified address on the internet and find a html element and get the src link from the element then return the src to the imagelocation of a picturebox. Is this at least possible?
This may sound really stupid but I have to ask cause I'm not finding this answer anywhere.I have an application where the user will need to sign up for a new user account on the website [URL]..However when I am using Firefox's plug-in Firebug to view html I am getting something totally different than when I just right click on the site and view the page source.
What I am trying to do is to get the captcha from the website and display it in a picturebox on the application so the user can view the captcha, solve the captcha and then the app post is back to the service for a response.
Here is the source that I am getting using Firefox's Firebug to inspect the element:
<td> <input type="hidden" value="Oo3Jo1I8bgzK68agMqo3s79ZZib2OkbK" name="iden"> <img class="capimage" src="/captcha/Oo3Jo1I8bgzK68agMqo3s79ZZib2OkbK.png" alt="i wonder if these things even work"> </td>
[Code]...
Why would the two be showing me two different versions of the HTML?
And how would you be able to grab that source to view in a picturebox using webclient?
I have been parsing xml content using the xmlreader and cannot use the xml document but so far it works getting all elementcontent except for the attribute contents. I need to parse the link below found in the following entry;[code]
I know that in a WebBrowser you can use Document.GetElementById to find an element by its name attribute, but I want to search the webpage for an element using the id or class atributes, how would it be possible to do this in a WebBrowser? I want to make it click on an image tag.
I have created Custom .NET controls, and I'd like to know if it's possible, how to add a custom attribute in the web.config when you add the reference to the control.
Currently it is: <controls> <add tagPrefix="FOO" src="~/Controls/FooControl.ascx" tagName="Bar" />
I have been doing well and also I am a noob I know it and you know it a lot has started making sense and I am evening figuring new things out without using Google but of course I have hit another snag in my program so here goes
I am waiting for an email to arrive (the page automatically refreshes) and then I want to click the link (I do not need to click to open the email or anything like that) I also have the code to click and navigate to the address reason being it was the only way I could figure out how to stop it opening in a new window on IE
So my only problem is I need a way to check every x seconds for the element and then if its there proceed with my code and if its not wait and then check again or however this is done in VB.If this is not the way its done please point me in the right direction the code I am using to find and then navigate to the link is
Dim emailpageelements As HtmlElementCollection = WebBrowser2.Document.GetElementsByTagName("a") For Each emailver As HtmlElement In emailpageelements If InStr(emailver.InnerHtml, "https://twitter.com/account/confirm_email/") Then WebBrowser1.Navigate(emailver.InnerText)
I am using NiceEdit to format text in text areas, it displays a toolbar over the specified text area, I created a test page, its working, I Response.Write the content of the text area after being formatted, and its okay, I created a break point to see whats being read, it was all fine.Now I moved to the real page where I should implement this text formatting, it simply did not do anything, the toolbar is shown and its working, but when I submit, nothing is being stored, i created a break point and the content of that text area was nothing, empty "".I went further and put Response.Write(textArea.text) then Response.End() and I got the error:XML Parsing Error: no element foundJust in case, the script I am using for the formatting NiceEdit toolbar, and this is the same script i used in my test page and worked just fine, the script is:
I am using an API (WSUS) that will give me an XML fragment that I need to work with. Essentially, I need to go through the fragment element by element, identify what type of element it is, and then put that element into the datagridview. The goal is to have a column with a human readable interpretation of the element, plus that actual element itself in a hidden column for further processing. So, using the below XML, I want the DGV to have column that says "Begin Or Group" and a hidden column with "<lar:Or>".
I can get an xmltextreader to loop through the elements just fine, but I can't figure out a way to return just the current element in XML. I've tried ReadString, Value, ToString, and a bunch of other stuff but just cannot seem to figure it out.
unordered text file of 3 columns to assign into 2 arrays. I've been given a graphing component which expects a two dimensional array for a scatter graph for the set of values in the last column.
How would I parse through the list given an indexed array of 215 possible 'zone alarm locations' and if an alarm log list item, of which there can more than one for any given zone location, compare in the two dimensional array any previous value and replace it with the higher valued one? The following are my declarations for the 2 arrays. It isn't clear to me why the array for the scatter data was defined as (999,1) knowing there are only 215 possible x values (alarm zone locations)
I'm having some trouble putting the pieces together.First of all, I'm currently using the WebBrowser component, but would be plenty happy with HtmlAgilityPack if it had some decent documentation, but for a newbie as VB.Net, it's a rough road.
What I'd like to do is grab all the h3's with the "this-class" class and stash them into an array (one in each array element).I'd then like to search through each one and see which has "And Another Title" - which I already have the code to do... I just don't know how to do the first bit.
I would like to place an if condition within the sub that will tell it to run when the xml node STORE with attribute TEST="test.doc" does not exist.
Sub InsertNode(ByVal doc As XmlDocument) Dim City As XmlNode = doc.DocumentElement Dim Location As XmlElement = doc.CreateElement("store") Location.SetAttribute("test", "test.doc")
I'm tryign to read a specific attribute from a xml website using this code:
'this is the url im trying to read, tmpIn is a string that complete the url: Dim url As String = "http://maps.google.com/maps/geo?q=" & tmpIn & "&output=xml" Dim reader As New XmlTextReader(url)
[Code]....
The problem is tmpIn takes diferents values (string) when the function is used and sometimes this works, and othertimes it gives an error (Invalid character in the given encoding. Line 9, position 15.), but is not because of the url, is when it tries to read the coordinates...
Imports System.Web Imports System.Net Imports System.Net.ServicePointManager Public Class GetSource Function GetHtml(ByVal strPage As String) As String tryAgain:
[Code]...
What I got here is a vb.net code where I parse the website for its html This function works fine. The question is this...
1.If I run 100 threads with this function at the same time, Will it work?
2.Won't it affect my internet connection as well?
I don't want to waste time creating threads and codes a hundred times so if you know the answer please advice me on what should I do instead
So the following code will return the version number which currently is 6.59 which is what I'm after. [Code] But then i remembered that releases are done as following: 6.59, 6.59b, 6.59c, 6.60, 6.60b etc. So when the b version of 6.59 is released the parser will still return 6.59. So how can i make this code better?
I need to parse a web page for blocks that contain open trouble tickets. The web page display several unresolved tickets and each one is inside a html divison labeled "issue-status". I've written the following code which does find the blocks, but when I try to parse its children to get its element fields (date opened, person requesting, history...) it instead pulls every element from the web page, not just the children.Is there a way to just parse the sub-fields under a particular DIV?
Code: Dim theElementCollection As HtmlElementCollection Dim strResult As String = ""
I am using VB.NET to read an XHTML file. I need my program to find every element within the XML structure which has the "class" attribute set to a specific value.IE: I need an array (or similar list) of all elements from the document which contain class="mytag".There is a list of several values I need to detect, all of which start with the same word 'mytag' followed by another word - so using a "contains" function seems sensible here
