How to tell web browser to wait for new page/specific url to load before continuing??

Hey everyone I know I am new here and I am new to VB but I am well into making my Twitter account maker which just started out as a bit of fun and then into a project to speed up making verified accounts for my marketing and now I am hooked into improving as it is turning into a very good program I am just stuck with one thing which I can see being a very simple solution but I have search forum after forum and tonnes of Google searches all worded different to solve my my.

It really is simple at present I use different buttons to automate different parts/pages of the account creation I am now setting it up so I click say for example a "go" button and it fills in the first page (and heres where I'm stuck waits for a specific url or even just a new url to load before continuing with the next bit of code????

Please how do I make it wait it seems like such a simple thing to do yet I cannot find any code online that works I have figured out everything along the lines and have even started to get the general hang of understanding the code compared to when I started it all seemed so unlogical lol.

The reason you can't find a way is because there isn't one. You don't "make it wait". You call Navigate and then you let it do its thing. When it finishes loading the page, it will tell you. It does so by raising its DocumentCompleted event. You handle the event and, when it's raised, you do whatever it is that you want to do when the page has finished loading. Just note that, if it contains sub-documents, a page may prompt more than one DocumentCompleted event. You should start by reading the documentation for the event and then search for examples on the web to learn how to use it properly.

I am still new to this but I have stumbled across DocumentCompleted while searching for ways to solve my problem I also know my questions sound very stupid to some I can assure you I do search first in fact I search everywhere before asking questions and have already learnt so much just from Google searches, forums and YouTube Video's.

I do appreciate your reply to my question as I have been getting more and more frustrated with this issue and not being able to find a solution was even more annoying so thanks. I don't suppose you can point me in the direction of any forum posts, guides or anything on using DocumentCompleted and handling events etc.

I do not mind reading or even having to do research just to understand what a post/guide/thread/example is going on about so please do not hold back if you feel I would not understand I have of course started reading up on this as we speak but just thought you might know of a post etc which would help if not no worries thanks for your help above.

There's not much to it really. If you were thinking that you wanted to do this:

vb.net Code:

Private Sub Button1_Click(...) Handles Button1.Click
    WebBrowser1.Navigate("some URL")
    WaitForDocumentToLoad()
    DoSomething()
End Sub

then you do this instead:

vb.net Code:

Private Sub Button1_Click(...) Handles Button1.Click
    WebBrowser1.Navigate("some URL")
End Sub
 
Private Sub WebBrowser1_DocumentCompleted(...) Handles WebBrowser1.DocumentCompleted
    If Not WebBrowser1.IsBusy Then
        DoSomething()
    End If
End Sub

Quote:

---

Originally Posted by jmcilhinney

There's not much to it really. If you were thinking that you wanted to do this:

vb.net Code:

Private Sub Button1_Click(...) Handles Button1.Click
    WebBrowser1.Navigate("some URL")
    WaitForDocumentToLoad()
    DoSomething()
End Sub

then you do this instead:

vb.net Code:

Private Sub Button1_Click(...) Handles Button1.Click
    WebBrowser1.Navigate("some URL")
End Sub
 
Private Sub WebBrowser1_DocumentCompleted(...) Handles WebBrowser1.DocumentCompleted
    If Not WebBrowser1.IsBusy Then
        DoSomething()
    End If
End Sub

---

Thank you for taking the time to reply to my thread I will try this but I just wanted to explain what I am trying to do and ask if the above code is what I need to use.

I will be clicking a button which will fill all the text forms from text box's then it clicks submit (This is the part I need it to wait/pause/etc here) and then fills in the next pages text box and click submit again.

I am going to try to implement the code to my project and your right it does look very simple right from when I first encountered this problem I was surprised I was able to complete other tasks but was totally stuck with this one.

If I am unable to get this working I will post an example of my code but I am usually pretty good at working things like these out on my own well with good old Google's help but I am very grateful for all the help I have received so far I know I may not use the correct terminology for various processes etc but I am learning VB 2010 slowly but surely lol

I may be totally off base but here goes any ways

I have a web browser which is set (in properties) to go to Twitter's Mobile Sign Up Page (which recently changed to now be over 2 pages instead of just one.

So my program fills in the first page clicks the button and this is where my problem is because I have used the document complete but this just trys to run the code straight away.

Either I am missing some way of specifying when to run this piece of code or I am on the totally wrong tracks.

Believe me I have spent hours reading other posts and countless searches on Google and found nothing on the exact same lines as my problem apart from I stumbled across what appears to be a similar to document complete but for navigation is this what I should be looking at????

In simple words I am completing a sign up process and need to halt the program from continuing until it has clicked continue and loads the next page???

Even just examples of code doing this should be enough for me to figure out the rest but please if anyone knows what I am trying to achieve and knows how I could really do with your help as I am so determined to figure this out

vb Code:

' Do something
 
While Me.WebBrowser1.ReadyState <> WebBrowserReadyState.Complete
   Application.DoEvents()
End While
 
' Do something

This is the code for the button which gets clicked to start the account creation process

vb Code:

WebBrowser1.Document.GetElementById("oauth_signup_client[fullname]").SetAttribute("value", fullnametb.Text)
        WebBrowser1.Document.GetElementById("oauth_signup_client[email]").SetAttribute("value", emailtb.Text)
        WebBrowser1.Document.GetElementById("oauth_signup_client[password]").SetAttribute("value", passwordtb.Text)
        WebBrowser1.Document.GetElementById("captcha_response_field").SetAttribute("value", captchatb.Text)
        If WebBrowser1.ReadyState = WebBrowserReadyState.Complete Then
            Dim allelements As HtmlElementCollection = WebBrowser1.Document.All
 
            For Each webpageelement As HtmlElement In allelements
 
                If webpageelement.GetAttribute("type") = "submit" Then
 
                    webpageelement.InvokeMember("click")
 
                End If
 
            Next
        End If

I am sorry being such a noob I know how annoying it can be on forums when people appear to be asking simple questions but if I wanted the above code to wait for the new page to load (invoke member click will click continue and thus load new page how do I then get it to carry out the below after waiting for the new page to load instead of what it does now trying to do it all at once

vb Code:

WebBrowser1.Document.GetElementById("settings[screen_name]").SetAttribute("value", usernametb.Text)

Quote:

---

Originally Posted by ident

vb Code:

' Do something
 
While Me.WebBrowser1.ReadyState <> WebBrowserReadyState.Complete
   Application.DoEvents()
End While
 
' Do something

---

I'm afraid that that is terrible advice. Never, ever call Application.DoEvents in a loop under any circumstances.

Guess I wont be trying that then lol :P I don't think I have ever got this stressed trying to figure something like this out in all honesty I thought it would be easy to implement a way of waiting for a specific url to load or even just a new page before carrying on

I think I could put a book together with all the forum posts I found asking the same thing as me just worded differently lol

So you didn't understand post #4 at all - right?

Do you get what an EVENT is and that the EVENT fires and runs a function when "something" happens?

Yea I got post 4 and even played around with it to make sure I understood it fully as I was using document completed before without realising.

How do I differentiate from document completed from webbrowser1's first and second page, if that didn't make sense then this might I have filled out the text boxes on page one and then clicked continue with invoke member now how do I call/wait for document completed on the new page instead of the old one

I am getting the feeling due to my lack of terminology and stress lol many do not understand what I am trying to say.

I've done it OMG at last its only taken me like all day to do lol

I ended up using

vb Code:

Call WaitForPageLoad()

vb Code:

Private Property pageready As Boolean = False
 
#Region "Page Loading Functions"
    Private Sub WaitForPageLoad()
        AddHandler whatbrowser.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf PageWaiter)
        While Not pageready
            Application.DoEvents()
        End While
        pageready = False
    End Sub
 
    Private Sub PageWaiter(ByVal sender As Object, ByVal e As WebBrowserDocumentCompletedEventArgs)
        If whatbrowser.ReadyState = WebBrowserReadyState.Complete Then
            pageready = True
            RemoveHandler whatbrowser.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf PageWaiter)
        End If
    End Sub
 
#End Region

Is there any reason why using this method is any different to placing

vb Code:

If WebBrowser1.ReadyState = WebBrowserReadyState.Complete Then
 
DO WHAT I WANTED YOU TO DO IN THE FIRST PLACE

where I placed WaitForPageLoad???????

On another note I am sorry for my noobish terminology and what probably appears to be some one just messing around I can assure you I do always try to teach myself and when I get motivated I figure things out using trial and error just as in this case and although I hit a lot of problems and guesswork lol I learnt a lot from today. Some may find my learning methods some what different but it usually all works out ok :) I hate being a noob lol I kinda got used to being some one in the know on SEO forums etc and now I'm back to the bottom lool :P

FWIW, This is what I'm using in a app I'm currently working on for a specific site, so far its the only code that has worked for me, and I've tried a lot of things, including post #4.

Code:

---

Private Sub WebBrowser1_DocumentCompleted(....

    If (e.Url.AbsolutePath = Me.WebBrowser1.Url.AbsolutePath) Then
      ' I call my code here
    End If

End Sub

---

Quote:

---

Originally Posted by jmcilhinney

I'm afraid that that is terrible advice. Never, ever call Application.DoEvents in a loop under any circumstances.

---

really? Thanks for the advice. Can i ask why. I did wonder why you never suggested it.

sam

Please look at your task manager cpu usage - before you run this loop.

And then after as well - running your app - running in the loop

...but stopping the reply from ever happening!!!

change your code to this

Code:

---

    Private Sub WaitForPageLoad()
        AddHandler whatbrowser.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf PageWaiter)       
        While 1=1 ' Not pageready
                      ' fake the loop into running forever       
            Application.DoEvents()       
        End While       
        pageready = False   
    End Sub

---

What does the cpu do?

If it spikes - well - you are not allowed to do that. Even for 10 ms