Develop Reference

Why the Login web page isn't showing in webBrowser?

I am using C# to login to a local web page.
I am using webBrowser in order to display the page after the log.
First, I navigate to page then I fill the username & password then I invoke a click.The element to be clicked is recognized; so I assume that the click happened. But the result page isn't showing, nothing appears when I execute.
I tried this:
public WebBrowser webBrowser;
public MainWindow()
{
InitializeComponent();
webBrowser = new WebBrowser();
webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(LoginEvent);
webBrowser.AllowNavigation = true;
webBrowser.Navigate("http://192.168.1.100/login.html");
}
private void LoginEvent(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser webBrowser = sender as WebBrowser;
//To execute the event just one time
webBrowser.DocumentCompleted -= LoginEvent;
//load page's document
HtmlDocument doc = webBrowser.Document;
doc.GetElementById("u").SetAttribute("value", "admin");
doc.GetElementById("pw").SetAttribute("value", "123456");
foreach (HtmlElement elem in doc.GetElementsByTagName("a"))
{
elem.InvokeMember("click");
}
}
Can anyone help me please to figure why the page isn't showing?

1) Your WebBrowser object is a local variable in your MainWindow() constructor.
This object is being deposed once the MainWindow constructor ends.
You need to declare the WebBrowser object as a class member.
2) There might be a multiple DocumentComplete events being fired. You need to filter out all iFrame events and wait before the page being fully loaded:
private void LoginEvent(object sender, WebBrowserDocumentCompletedEventArgs e)
{
// filter out non main documents
if (e.Url.AbsolutePath != (sender as WebBrowser).Url.AbsolutePath)
return;
//To execute the event just one time
webBrowser.DocumentCompleted -= LoginEvent;
//load page's document
HtmlDocument doc = webBrowser.Document;
doc.GetElementById("u").SetAttribute("value", "admin");
doc.GetElementById("pw").SetAttribute("value", "123456");
foreach (HtmlElement elem in doc.GetElementsByTagName("a"))
{
elem.InvokeMember("click");
}
}

Open multiple pages in WebBrowser and send a command to all of them

I have a winform app with the following functionality:
Has a multiline textbox that contain one URL on each line - about 30 URLs (each URL is different but the webpage is the same (just the domain is different);
I have another textbox in which I can write a command and a button that sends that command to an input field from the webpage.
I have a WebBrowser controller ( I would like to do all the things in one controller )
The webpage consist of a textbox and a button which I want to be clicked after I insert a command in that textbox.
My code so far:
//get path for the text file to import the URLs to my textbox to see them
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog fbd1 = new OpenFileDialog();
fbd1.Title = "Open Dictionary(only .txt)";
fbd1.Filter = "TXT files|*.txt";
fbd1.InitialDirectory = #"M:\";
if (fbd1.ShowDialog(this) == DialogResult.OK)
path = fbd1.FileName;
}
//import the content of .txt to my textbox
private void button2_Click(object sender, EventArgs e)
{
textBox1.Lines = File.ReadAllLines(path);
}
//click the button from webpage
private void button3_Click(object sender, EventArgs e)
{
this.webBrowser1.Document.GetElementById("_act").InvokeMember("click");
}
//parse the value of the textbox and press the button from the webpage
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
newValue = textBox2.Text;
HtmlDocument doc = this.webBrowser1.Document;
doc.GetElementById("_cmd").SetAttribute("Value", newValue);
}
Now, how can I add all those 30 URLs from my textbox in the same webcontroller so that I can send the same command to all of the textboxes from all the webpages and then press the button for all of them ?
//EDIT 1
So, I have adapted #Setsu method and I've created the following:
public IEnumerable<string> GetUrlList()
{
string f = File.ReadAllText(path); ;
List<string> lines = new List<string>();
using (StreamReader r = new StreamReader(f))
{
string line;
while ((line = r.ReadLine()) != null)
lines.Add(line);
}
return lines;
}
Now, is this returning what it should return, in order to parse each URL ?

If you want to keep using just 1 WebBrowser control, you'd have to sequentially navigate to each URL. Note, however, that the Navigate method of the WebBrowser class is asynchronous, so you can't just naively call it in a loop. Your best bet is to implement an async/await pattern detailed in this answer here.
Alternatively, you CAN have 30 WebBrowser controls and have each one navigate on its own; this is roughly equivalent to having 30 tabs open in modern browsers. Since each WebBrowser is doing identical work, you can just have 1 DocumentCompleted event written to handle a single WebBrowser, and then hook up the others to the same event. Do note that the WebBrowser control has a bug that will cause it to gradually leak memory, and the only way to solve this is to restart the application. Thus, I would recommend going with the async/await solution.
UPDATE:
Here's a brief code sample of how to do the 30 WebBrowsers way (untested as I don't have access to VS right now):
List<WebBrowser> myBrowsers = new List<WebBrowser>();
public void btnDoWork(object sender, EventArgs e)
{
//This method starts navigation.
//It will call a helper function that gives us a list
//of URLs to work with, and naively create as many
//WebBrowsers as necessary to navigate all of them
IEnumerable<string> urlList = GetUrlList();
//note: be sure to sanitize the URLs in this method call
foreach (string url in urlList)
{
WebBrowser browser = new WebBrowser();
browser.DocumentCompleted += webBrowserDocumentCompleted;
browser.Navigate(url);
myBrowsers.Add(browser);
}
}
private void webBrowserDocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
//check that the full document is finished
if (e.Url.AbsolutePath != (sender as WebBrowser).Url.AbsolutePath)
return;
//get our browser reference
WebBrowser browser = sender as WebBrowser;
//get the string command from form TextBox
string command = textBox2.Text;
//enter the command string
browser.Document.GetElementById("_cmd").SetAttribute("Value", command);
//invoke click
browser.Document.GetElementById("_act").InvokeMember("click");
//detach the event handler from the browser
//note: necessary to stop endlessly setting strings and clicking buttons
browser.DocumentCompleted -= webBrowserDocumentCompleted;
//attach second DocumentCompleted event handler to destroy browser
browser.DocumentCompleted += webBrowserDestroyOnCompletion;
}
private void webBrowserDestroyOnCompletion(object sender, WebBrowserDocumentCompletedEventArgs e)
{
//check that the full document is finished
if (e.Url.AbsolutePath != (sender as WebBrowser).Url.AbsolutePath)
return;
//I just destroy the WebBrowser, but you might want to do something
//with the newly navigated page
WebBrowser browser = sender as WebBrowser;
browser.Dispose();
myBrowsers.Remove(browser);
}

C# winforms webbrowser not going to url's asked for

I was asked by a friend to develop a winform app to be able to extract data. I figured it would be easy enough - how wrong I was!
In my winform, I have included a webbrowser control and some buttons. The URL for the webbrowser is http://www.racingpost.com/greyhounds/card.sd and as you can imagine, it is the place to get data for greyhounds. When on the page above, there are a number of links within this area which are specific to a race time. If you click on any of these, it takes you to that race, and its this data that I need to extract. So, my initial thoughts were to get ALL links off the link above, then store them in a list, then just have a button available to take in whatever link it is, and then take the webbrowser to that location. Once there, I can then look to extract the data and store it as needed.
So, in the first instance, I use
//url = link above
wb1.Url = new Uri(url);
grab the data (which are links for each race on that day)
once I have this, use a further button to go to the specific race
wb1.Url = new Uri("http://www.racingpost.com/greyhounds/card.sd#resultday=2015-01-17&raceid=1344640");
then, once there, click another button to capture the data, after which, return to the original link above.
The problem is, it will not go to the location present in the link. BUT, if I click the link manually within the webbrowser, it goes there no problem.
I have looked at the properties of the webbrowser, and these all look fine - although I can't qualify that tbh!
I know if I try to go to the links manually, I can, but if I try to do it through code, it just wont budge. I can only assume I have done something wrong in the code.
Hope some of that makes sense - first posting, so apologies if I made a mess of it. I will provide all code no problem, but cant seem to figure out how to post the code in 'code format'?
//here is the code
public partial class Form1 : Form
{
Uri _url;
public Form1()
{
InitializeComponent();
wb1.Url = new Uri("http://www.racingpost.com/greyhounds/card.sd");
wb1.Navigated +=new WebBrowserNavigatedEventHandler(wb1_Navigated);
}
classmodules.trackUrl tu;
private void btnGrabData_Click(object sender, EventArgs e)
{
classmodules.utility u = new classmodules.utility();
rtb1.Text = u.GetWebData("http://www.racingpost.com/greyhounds/card.sd");
HtmlDocument doc = wb1.Document;
string innerText = (((mshtml.HTMLDocument)(doc.DomDocument)).documentElement).outerHTML;
innerText = Regex.Replace(innerText, #"\r\n?|\n", "");
rtb1.Text = innerText;
tu = new classmodules.trackUrl();
u.splitOLs(ref tu, innerText);
classmodules.StaticUtils su = new classmodules.StaticUtils();
su.SerializeObject(tu, typeof(classmodules.trackUrl)).Save(#"d:\dogsUTL.xml");
classmodules.ExcelProcessor xl = new classmodules.ExcelProcessor();
xl.createExcel(tu);
}
private void wb1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser wb1 = sender as WebBrowser;
this.Text = wb1.Url.ToString();
}
void wb1_Navigated(object sender, WebBrowserNavigatedEventArgs e)
{
_url = e.Url;
}
private void btnGoBack_Click(object sender, EventArgs e)
{
goBack();
}
private void goBack()
{
wb1.Url = new Uri("http://www.racingpost.com/greyhounds/card.sd");
}
private void btnGetRaceData_Click(object sender, EventArgs e)
{
HtmlDocument doc = wb1.Document;
string innerText = (((mshtml.HTMLDocument)(doc.DomDocument)).documentElement).outerHTML;
rtb2.Text = innerText;
}
//###############################
//OK, here is the point where I want to take in the URL and click a button //to instruct the webbrowser to go to that location. I add an initial //counter to 0, and then get the first url from the list, increment the //counter, then when I click the button again, urlNo wil be 1, so then it //tries the second url
int urlNo = 0;
private void btnUseData_Click(object sender, EventArgs e)
{
if (tu.race.Count > urlNo)
{
string url = tu.race[urlNo].url;
wb1.Url = new Uri(url);
lblUrl.Text = url;
urlNo++;
}
else
{
lblUrl.Text = "No More";
}
}

Did you try the Navigate(...) method? In theory, the behavior of Navigate and Url is the same, but I can infer that they behave a bit different.
http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser.navigate(v=vs.110).aspx

How to disable every navigation in WebBrowser?

I have a WebBrowser control which I dinamically refresh/change url based on user input. I don't want to let the user to navigate, so I set AllowNavigation to false. This seems to be OK, however the below link is still "active":
Close Page
The issue here is: If the user clicks it, and confirms closure in the pop-up window I can't manage WebBrowser anymore. Looks like it is closed though the last page is still visible. Also I can't remove this link as the site is not managed by me.
Disable the control? Nope, I have to allow the user to highlight and copy text from the webpage.
Do I have any other option to disable literally ALL links?
#TaW: here is my code based on yours. So I have to set the url from my code and call a custom one:
button_click()
{
webBrowser1_load_URL("http://website/somecheck.php?compname=" + textBoxHost.Text);
}
Here it is the function:
private void webBrowser1_load_URL(string url)
{
string s = GetDocumentText(url.ToString());
s = s.Replace(#"javascript:window.close()", "");
webBrowser1.AllowNavigation = true;
webBrowser1.DocumentText = s;
}
The rest is exaclty what's in your answer:
private void webBrowser1_DocumentCompleted(object sender,
WebBrowserDocumentCompletedEventArgs e)
{
webBrowser1.AllowNavigation = false;
}
public string GetDocumentText(string s)
{
WebBrowser dummy = new WebBrowser(); //(*)
dummy.Url = new Uri(s);
return dummy.DocumentText;
}
Still it's not working. Please help me to spot the issue with my code.

If you have control over the loading of the pages you could grab the pages' text and change the code to disable rogue scripts. The one you showed can simply be deleted. Of course you might have to forsee more than the one..
Obviously this could be eased if you could do without javascript alltogether, but if that is not an option go for those that do real or pseudo-navigation..
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
webBrowser1.AllowNavigation = false;
}
private void loadURL_Click(object sender, EventArgs e)
{
webBrowser1.AllowNavigation = true;
string s = File.ReadAllText(textBox_URL.Text);
s = s.Replace("javascript:window.close()", "");
webBrowser1.DocumentText = s;
}
If the pages are not in the file system, the same trick should work, for instance by loading the URL into a dummy WebBrowser like this:
private void cb_loadURL_Click(object sender, EventArgs e)
{
string s = GetDocumentText(tb_URL.Text);
s = s.Replace("javascript:window.close()", "");
webBrowser1.AllowNavigation = true;
webBrowser1.DocumentText = s;
}
public string GetDocumentText(string s)
{
WebBrowser dummy = new WebBrowser(); //(*)
dummy.Url = new Uri(s);
return dummy.DocumentText;
}
Note: According to this post you can't set the DocumentText quite as freely as one would think; probably a bug.. Instead of creating the dummy each time you can also move the (*) line to class level. Then, no matter how many changes you had to make, you would always have an unchanged version, th user could e.g. save somewhere..

Wait for loading page after button click

I want to be able to click on button and than wait for the page to load.
I search, but there is no solution that work correctly.
This is part of code:
el = webBrowser1.Document.GetElementById("LoginButton");
el.InvokeMember("click");
webBrowser1.Navigate(url);
I need it to be that after click, the application will load the page, and only then go to another page.
Also, webBrowser1.Navigate(url) must be in the same method as click. Because it all in a loop.
Please help.
EDITED.
*More code* (first code was and example of what i need)
List<string> list1 = new List<string>();
bool flag = true;
while (flag)
{
flag = false;
foreach (HtmlElement he2 in webBrowser1.Document.GetElementsByTagName("a"))
{
if (he2.GetAttribute("href").Contains("profile.php?ID="))
{
list1.Add(he2.InnerText);
}
}
foreach (HtmlElement he in webBrowser1.Document.GetElementsByTagName("a"))
{
if (he.InnerHtml == "Next")
{
flag = true;
he.InvokeMember("click");
}
}
}
When I click, next page must load, and i have to parse tag on next page, but it begin parse page before next page is load, so it parse the same page.

Finally, I just got href from my button and used this code(insted of he.InvokeMember("click"))
:
webBrowser1.Navigate(url_next);
while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
Application.DoEvents();
It works fine.

You can use the DocumentCompleted event to find out when the login has completed.
webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
el = webBrowser1.Document.GetElementById("LoginButton");
el.InvokeMember("click");
void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
Uri myUrl = new Uri("http://stackoverflow.com");
if (e.Url == myUrl)
{
WebBrowser1.Navigate(url);
}
}