Fill the fields in dynamically created webbrowser

[Enigmatic]

Hi, i created dynamically webbrowser in for loop and navigate to url, i want fill the username fields with MyBrowser_DocumentCompleted events but no success, i am adding AddHandler but again not succes, ho can i fill the fields in for loop.

I created all elements in action without only tabcontrol, add tabcontrol in form and delete tabpages firstly.

Public Class Form1

    Dim WithEvents MyBrowser As New WebBrowser

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim Sites() As String = {"Facebook", "Linkedin"}
        Dim Url() As String = {"https://m.facebook.com/", "https://www.linkedin.com/uas/login"}

        For i = 0 To Sites.Length - 1
            Dim TabControl As New TabControl
            Dim newTabPage As New TabPage()
            Dim MyBrowser As WebBrowser = New WebBrowser

            newTabPage.Text = Sites(i)
            TabControl1.TabPages.Add(newTabPage)

            AddHandler MyBrowser.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf MyBrowser_DocumentCompleted)
            newTabPage.Controls.Add(MyBrowser)
            MyBrowser.Navigate(Url(i))
            MyBrowser.Dock = DockStyle.Fill
            MyBrowser.ScriptErrorsSuppressed = True

        Next

    End Sub

    Private Sub MyBrowser_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles MyBrowser.DocumentCompleted

        MyBrowser.Document.GetElementById("m_login_email").SetAttribute("value", "mymail")
        MyBrowser.Document.GetElementById("username").SetAttribute("value", "myusername")

    End Sub

End Class 

[Enigmatic]

Any ideas?

[Shaggy Hiker]

What isn't working?

For one thing, this is a bad idea. Automating interactions with web pages is ultimately doomed to frustration. Those who maintain web pages frequently change them, so what works today will fail tomorrow. This is done for a variety of reasons. In the case of the two sites you show in your code, they both have terms of service limiting what you can do automatically. Logging in is not explicitly prohibited, or this thread would be closed, since we do not support the writing of anything that violates the terms of service of other sites. However, since both of these sites forbid content scraping, then they probably make automated logins as difficult as they possibly can be. You may simply be writing to the wrong place, or in a way that it is getting rejected.

Any site that WANTS you to be able to automate actions will provide an API for you to use. The advantage of an API is that you don't have to go through the painful steps that you are taking of loading a page, waiting for parts to finish loading, then trying to find fields, add data, submit data, and so on. Also, an API won't change very often, if at all, so you can count on an application that uses an API to keep working while you can count on a web scraping application to keep failing as changes to the page are made.

So, what you are trying to do is not explicitly prohibited, but it is very likely that the sites have made it difficult, and possibly even impossible to do right. Use the API, if possible.

[jdc20181]

What isn't working?

For one thing, this is a bad idea. Automating interactions with web pages is ultimately doomed to frustration. Those who maintain web pages frequently change them, so what works today will fail tomorrow. This is done for a variety of reasons. In the case of the two sites you show in your code, they both have terms of service limiting what you can do automatically. Logging in is not explicitly prohibited, or this thread would be closed, since we do not support the writing of anything that violates the terms of service of other sites. However, since both of these sites forbid content scraping, then they probably make automated logins as difficult as they possibly can be. You may simply be writing to the wrong place, or in a way that it is getting rejected.

Any site that WANTS you to be able to automate actions will provide an API for you to use. The advantage of an API is that you don't have to go through the painful steps that you are taking of loading a page, waiting for parts to finish loading, then trying to find fields, add data, submit data, and so on. Also, an API won't change very often, if at all, so you can count on an application that uses an API to keep working while you can count on a web scraping application to keep failing as changes to the page are made.

So, what you are trying to do is not explicitly prohibited, but it is very likely that the sites have made it difficult, and possibly even impossible to do right. Use the API, if possible.

Just to add on, they do not prohibit auto-fill what they discourage is automatically logging in by means of automation, or non-user contact.

I honestly discourage this as well, but if you NEED to login to a website automatically, or want to make your life easier, take advantage of stay login features that BOTH of these sites have. Unfortunately its hard to do in VB since the controls are disposed on exit.

[Enigmatic]

I gave these sites as examples. I have subscribed commercial sites, I would like to store the addresses and passwords of these sites in the configuration file and facilitate my work. After logging in, I need to get my sales reports. I wouldn't have a job with my facebook. I'm sending the real image of the system I'm trying to do, see here. also don't look at every helper with exploitative eyes.