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Webbrowser C# How to put a changing value in a textbox?

I cant seem to figure out how to put the value text into a texbox.Text on Webbrowser C# because with this website the value changes and there are duplicates of the input code and cant pinpoint Webbrowser to put the changing value username in a textbox.Text as seen in screenshot below.
I hope someone knows how to do this with the Webbrowser in C#
Thanks in advance.
Problem Screenshot
This is the website I am trying to get the username from: fakepersongenerator

You'd need to manually scan through the DOM and find the element based on it's xpath. Like this:
webBrowser.DocumentCompleted += (o, e) =>
{
var frame1 = webBrowser.Document.Body.GetElementsByClassName("frame-1");
if (frame1.Count > 0)
{
var rows = frame1[0].GetElementsByClassName("row no-margin");
if (rows.Count > 4)
{
var usernameForm = rows[4].GetElementsByClassName("form-control");
if (rows.Count > 0)
{
// Do something with value here
Console.WriteLine(usernameForm[0].GetAttribute("value"));
}
}
}
};
webBrowser.Navigate("http://www.fakepersongenerator.com/Index/generate");
Extension class to :
internal static class Utils
{
internal static List<HtmlElement> GetElementsByClassName(this HtmlElement doc, string className = "")
{
var list = new List<HtmlElement>();
foreach (HtmlElement e in doc.All)
if (e.GetAttribute("className") == className)
list.Add(e);
return list;
}
}
There isn't really a way in the default web browser to detect changes after a page load, so if you wanted to monitor for changes, you'd have to set up a BackgroundWorker or Timer to poll the browser and manually look for a value change.

Set & Get input value in web browser in c#

I just try to understand the concept of in web browser control c# win app.
I have created a Windows app with web browser control. I have called a web page (which is my own) and try to set value in the web page from my app.
When i try with Google
webBrowser1.Navigate("http://google.com/search?q=" + "C#");
it works fine.
When i try in this way, it is not working.
HtmlElement textArea = webBrowser1.Document.All["q"];
textArea.InnerText = "dsfs";
Can anyone help me to achieve this?

You will need to wait for the WebBrowser to load before you access it (otherwise Document will be null until loaded) - subscribe a DocumentCompleted event handler for this. Also Document.All["q"] will return the first element with the name "q".
webBrowser1.Navigate("http://stackoverflow.com/questions/30431004");
webBrowser1.DocumentCompleted += (o, args) =>
{
var ele = webBrowser1.Document.All["q"];
if (ele.TagName.ToLower() == "input")
{
ele.InnerText = "dsfs";
}
};
If you want to change more than one such element, or if you want to locate elements by Id, Tag name etc, you will need to iterate the collection:
foreach (HtmlElement ele in webBrowser1.Document.All)
{
if (ele.TagName.ToLower() == "input")
{
ele.InnerText = "dsfs";
}
}

Post to facebook group with C# code

I am working on a windows application where I embedded webbroswercontrol. I am trying to post sample message to a open facebook group. I am unable to change value of a textbox with c#. When ever I automate click it says textbox value is null. What would be the fix?
<input type="hidden" autocomplete="off" class="mentionsHidden"
name="xhpc_message" value="lklklkl">
HtmlElement textBox = this.FindControlByName("xhpc_message",
this.webBrowser.Document.All);
//Click Code
var elements = webBrowser.Document.GetElementsByTagName("button");
foreach (HtmlElement element in elements)
{
// If there's more than one button, you can check the
//element.InnerHTML to see if it's the one you want
if (element.InnerText.Contains("Post"))
{
if (textBox.InnerText.Trim() == "Write something...")
{
textBox.Focus();
textBox.GetAttribute("value").Equals("Test Message");
IHTMLElement nativeElement = element.DomElement as IHTMLElement;
nativeElement.click();
break;
}
}
}

1) I suggest you to ensure, that textbox is null, not the textBox.InnerText. Usually inner text for elements is null, so its better to check the "placeholder" attribute and update the code with:
// if (textBox.InnerText.Trim() == "Write something...")
if (textBox.GetAttribute("placeholder") == "Write something...")
2) This code doesn't set the value. It gets the value and compares to "Test message".
textBox.GetAttribute("value").Equals("Test Message");
Just use SetValue instead.
textBox.SetAttribute("value", "Test message");
3) Ensure, that all operations are made after page is loaded.
public SomeFormName()
{
...
webBrowser.DocumentCompleted += webBrowser_DocumentCompleted;
}
void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs args)
{
// put your code here
}
4) Not sure, how the FindControlByName is working, so check a simple LINQ query to ensure that textbox is found.
var textbox = webBrowser.Document.All.OfType<HtmlElement>()
.Where(item => item.Name == "xhpc_message")
.FirstOrDefault()
;

Use the code below after the Document complete event has been fired completely in a separate function, after commenting your code.The URL in the webbrowser should be holding the Group Page on which the post is to happen.
private void AfteDocumentLoads()
{
HtmlElementCollection textBox = webBrowser.Document.GetElementsByTagName("textarea").GetElementsByName("xhpc_message");
HtmlElementCollection button = webBrowser.Document.GetElementsByTagName("button");
foreach (HtmlElement element in textBox)
{
foreach (HtmlElement btnelement in button)
{
if (btnelement.InnerText == "Post")
{
element.Focus();
element.InnerText = txtPortalUserId.Text.ToString();
btnelement.InvokeMember("Click");
}
}
}
}
I was also stuck as it was not posting earlier because I was using WebBrowser class to get current WebBrowser. Result was that the text was inputted to the Group as a 'dim' Comment. Even if I clicked manually on FB page it would say "This status update appears to be blank. Please write something or attach a link or photo to update your status."
I used the page's webbrowser & it worked cos' it came in proper manner on the page. Also little bit of changes are there in the LOCs

Block elements within site WebBrowser

I have created a WebBrowser object and would like to know how to block specific elements of a page such as a flash object. I presume I would need to check for an offending URL and cancel the navigation to that element.

Hmm I'd do something like this to disable the Flash elements
WebBrowser wb = new WebBrowser();
//...
//...
//...
//...
HtmlElementCollection hec = wb.Document.All;
foreach (HtmlElement element in hec)
{
if (element.TagName == "OBJECT")
{
element.Enabled = false;
}
}

You should inspect the WebBrowser.Document.HtmlDocument property to strip out any object tags responsible for displaying flash.

How to access the scrollbar of a webbrowser control in c#?

My webbrowser control has to be disabled (enabled = false) so that the user can't click in it.
This also disables the access to the scrollbar so I'm thinking about creating another scrollbar next to the control that gets and passes its values from and to the webbrowser's scrollbar.
For that, I need to access the webbrowser scrollbar control. How can I find it ?
webbrowser.Controls.Count returns zero.

Hmm I don't know if there is any method to acccess the scrollbar position programmaticly. You can however, scroll by element name:
private void ScrollToElement(String elemName)
{
if (webBrowser1.Document != null)
{
HtmlDocument doc = webBrowser1.Document;
HtmlElementCollection elems = doc.All.GetElementsByName(elemName);
if (elems != null && elems.Count > 0)
{
HtmlElement elem = elems[0];
elem.ScrollIntoView(true);
}
}
}
Also, see this question for other possibilities.
EDIT:
See question Scrolling WebBrowser programatically sometimes doesn't work