If someone clicks on a hyper link inside a WebBrowser control , what method can i use to get the url of that hyperlink and check if it has an attribute that tells the browser to open the link in a new tab/window. Windows Forms Application.
You could obtain the element that currently has user input focus using the Document.ActiveElement property.
private void webBrowser1_NewWindow(object sender, CancelEventArgs e)
{
e.Cancel = true;
if (webBrowser1.Document != null)
{
HtmlElement currentElement = webBrowser1.Document.ActiveElement;
if (currentElement != null)
{
string targetPath = currentElement.GetAttribute("href");
//You can perform some logic here to determine if the targetPath conformsto your specification and if so...
MainForm newWindow = new MainForm();
newWindow.webBrowser1.Navigate(targetPath);
newWindow.Show();
//Otherwise
//webBrowser1.Navigate(targetPath);
}
}
}
Related
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");
}
}
I am working for a screen scrapping application from windows application
I can automatically navigate through login page and all the pages using the we browser methods and sometimes having to use the '.Click' to trigger buttons on some of the pages.
Here's the problem. When I do the final 'click' to get my data, web browser opens up a new explorer window(pop up windows) that contains the another link button and I have to do click on this link button using c# to get my final data.
How can I access the new window(pop up window) to scrape it?
I am using below code and this code open the URL in new pop up window.
HtmlElement toollinkbutton = WebBrowser1.Document.Window.Document.Body.Document.GetElementsByTagName("a")[48];
toollinkbutton .InvokeMember("click");
The new window may be due to target="_blank" or javascript and using InvokeMember will result in the new window opening. Add a handler to the WebBrowser control NewWindow event and handle the click by calling Navigate() instead.
private string url = "";
public Form1()
{
InitializeComponent();
WebBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
WebBrowser1.NewWindow += new System.ComponentModel.CancelEventHandler(webBrowser1_NewWindow);
}
void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
HtmlElementCollection links = WebBrowser1.Document.Links;
foreach (HtmlElement var in links)
{
var.AttachEventHandler("onclick", LinkClicked);
}
}
private void LinkClicked(object sender, EventArgs e)
{
HtmlElement link = WebBrowser1.Document.ActiveElement;
url = link.GetAttribute("href");
}
void webBrowser1_NewWindow(object sender, System.ComponentModel.CancelEventArgs e)
{
WebBrowser webBrowser = (WebBrowser)sender;
HtmlElement link = webBrowser.Document.ActiveElement;
Uri urlNavigated = new Uri(link.GetAttribute("href"));
WebBrowser1.Navigate(url);
e.Cancel = true;
}
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);
}
Is there a way I can, in C#, close the text input popup that is visible when you tap a TextBox?
I thought of setting focus to the LayoutRoot or ContentPanel (both parent grids) in my app but that does not work.
focusing the current page will hide the keyboard for you.
Make an extension method to get current active page
public static PhoneApplicationPage GetActivePage(this Application application) {
PhoneApplicationPage content = null;
if (application != null) {
PhoneApplicationFrame rootVisual = application.RootVisual as PhoneApplicationFrame;
if (rootVisual != null) {
content = rootVisual.Content as PhoneApplicationPage;
}
}
return content;
}
Then you can do this:
Application.Current.GetActivePage().Focus();
i will suggest you an alternative, for example you can do something like:
private void YourTextBoxGotFocus(object sender, RoutedEventArgs e)
{
YourTextBox.IsEnabled = false;
YourTextBox.IsEnabled = true;
}
Suppose my web browser is showing a html page where many buttons are there. I just like to know how could I capture click on any button inside web browser control from my c# win apps.
If it is possible then from that event i want to capture button name,height and width and any custom property. etc. Please guide me.
This will be helpful if you want to capture only mouse clicks:
WebBrowser _browser;
this._browser.DocumentCompleted+=new WebBrowserDocumentCompletedEventHandler(browser_DocumentCompleted);
...
private void browser_DocumentCompleted(Object sender, WebBrowserDocumentCompletedEventArgs e)
{
this._browser.Document.Body.MouseDown += new HtmlElementEventHandler(Body_MouseDown);
}
...
void Body_MouseDown(Object sender, HtmlElementEventArgs e)
{
switch(e.MouseButtonsPressed)
{
case MouseButtons.Left:
HtmlElement element = this._browser.Document.GetElementFromPoint(e.ClientMousePosition);
if(element != null && "submit".Equals(element.GetAttribute("type"),StringComparison.OrdinalIgnoreCase)
{
}
break;
}
}
can u please tell me how can i read custom attribute of any html
element loaded inside web browser control. thanks
If You don't want to link to "Microsoft.mshtml", You can try to use this sample method. But you can't read all members thru reflection:
public static String GetElementPropertyValue(HtmlElement element, String property)
{
if(element == null)
throw new ArgumentNullException("element");
if(String.IsNullOrEmpty(property))
throw new ArgumentNullException("property");
String result = element.GetAttribute(property);
if(String.IsNullOrEmpty(result))
{//В MSIE 9 получить свойство через DomElement не получается. Т.к. там он ComObject.
var objProperty = element.DomElement.GetType().GetProperty(property);
if(objProperty != null)
{
Object value = objProperty.GetValue(element.DomElement, null);
result = value == null ? String.Empty : value.ToString();
}
}
return result;
}