Manipulate/Change/Form Fill data in webpages using the Webbrowser control

when you run into this type of situation, try to figure out what action you are trying to simulate versus the result you want (sometimes the opposite is true). In this case, you want to simulate clicking on an image. It just so happens that the result is submitting the form.

Try this code to simulate clicking the image, which in turn should fire any code attached to that image.

Code:

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DirectCast(GetCurrentWebDoc.images.item("ctl00$Main$postComment$postcommentImageButton"), mshtml.HTMLImg).click()

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if that name value doesn't work, try the ID instead ("ctl00_Main_postComment_postcommentImageButton")


I do hope you are making some sort of "utility", and not anything that could be used maliciously to spam comments all over myspace. ;)

Sorry, I misread it as just an image (as in <img> tag) and not an input element of type image.

For some reason, I can't seem to access the specific element when its type image via the forms item collection. However this code seems to work:

Code:

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        Dim MyImageElement As mshtml.HTMLInputElement = DirectCast(GetCurrentWebDoc.all.item("ctl00_Main_postComment_postcommentImageButton"), mshtml.HTMLInputElement)
        MyImageElement.click()

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It told me "Unable to cast object of type 'System.Windows.Forms.HtmlDocument' to type 'mshtml.HTMLDocument'." for the following line of code

Code:

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Return DirectCast(WebBrowser1.Document, mshtml.HTMLDocument)

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in the GetCurrentWebDoc function.


It is causing null errors when I try to set a value. (I took out the exception stuff to figure out where the null value was comming from).

I think it is because I am trying to use it with a .dll page... but it is written in HTML. Is there a way I can use this same method for a .dll page?

I'm creating a program that you can enter info into and it will use that info to fill out the eBay Sell an item page, because I like to enter everything in when I'm in the car on my laptop, then when I have an internet connection, I can just plug it in and use it to list the items.

Quote:

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Originally Posted by VistaVB

A .dll page? ***.....

Are you using the Web Browser control or the .net 1.1 ActiveX Control? Thanks.

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web browser control in .net

eBay uses .dll pages... "http://my.ebay.com/ws/eBayISAPI.dll?MyEbay"


(That url only works if you are logged in)

Yes, until I actually finish up my 1.1+2.0 browser control that will have all the functionality of both ;)

Hi, I am also trying to code using VB6 to pass values from my application and fill the values in the web pages and submit the page. But the web pages are in frames. I am new to all these...:confused:

hi kleinma, my office blocked downloading of zip file. Can you email me the sample codes? My email is [email protected]. Thanks.

I have a vb program using webbrowser control. I wonder is there a way for me from vb to click an anchor tag thru code.

VB6 or VB.NET?

Quote:

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Originally Posted by kleinma

Sorry, I misread it as just an image (as in <img> tag) and not an input element of type image.

For some reason, I can't seem to access the specific element when its type image via the forms item collection. However this code seems to work:

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kleinma, first Id like to say a big thanks for this thread, it has been invaluable to me.

However, I had a page input button I wanted to click with no ID or Name along with several other input buttons on the page that I didnt want to click. To get round this I identified the button by its .src

heres the code..

Code:

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            Dim thisObj As Object
            Dim butInput As mshtml.HTMLInputElement
            thisObj = AxWebBrowser1.Document.getElementsByTagName("input")
            For Each butInput In thisObj
                If butInput.src = "TheNameOfTheImage.gif" Then
                    butInput.click()
                End If
            Next

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If you or anyone has a better way of doing it Id be interested to know, but this worked for me and maybe it'll help someone else too.

Off the top of my head I can't think of any other way of doing it. It does become a bit trickier when you have to deal with HTML that doesn't provide all the tags that it should (like a name or ID tag).

So what you are doing is fine.

cant we simply click on a form's submit button with the original webbrowser???

yes of course you can, but this thread is about automating input and interaction on webpages via VB code.

noo.. i mean automatically click on a submit button... because i'm having a problem while using the navigate2 function of axshdocvw...and i'm getting the same error when i use the InvokeMember("click") function of the original webbrowser provided in VB2005 expresss ed. here is the error screenshot:

the VB2005 managed webbrowser control and the COM webbrowser control act a bit different.

If you downloaded my sample application, there is a "submit form" example included.

yeah i tried to to make it for my application but it show me the error when i use Navigate2 function...

Well I am not sure why you are using the navigate2 method...

usually when you are on a page, and you want to submit it, you just simulate the submit button being clicked. This is what my example code does.

It sounds like you are trying to do something different.

noo...i've no page loaded yet..i'm loading it when the app starts...

look..i got a webform, which requires some dates and to be submitted...and i want the resulted html code...now i want it to be done multiple time with different dates..like
for i as integer = 0 to 100
' fill the date in the webform
' submit the form
' get the resulted html
' parse the html code
next

you can't quite do it in a loop like that, because the webbrowser is event driven. It fires events when it is doing things so you know what state it is in, and you know when you should proceed.

So to accomplish a repetitive task like that, you would need to do something like the following:

Lets say you have page1.htm (which is the page that has the fields that need to be filled in), and page2.htm (which is the page the form submits to and has the resulting HTML code you want)

Code:

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-Navigate to page1.htm
-When the DocumentCompleted event of the webbrowser fires the page has fully loaded
    check the current URL of the WB control
        if its page1.htm, fill in the values you want and submit form
        if its page2.htm, then page1 was just submitted, so get the resulting HTML code.

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yeah i have done the same thing in the original browser but i have to click to button each time... the code is something like this:

Code:

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dim counter as integer = 0
prv sub form_onload(...)
webbrowser1.documenttext = mycode
' press submit button code should be here
end sub

prv sub webbrowser1_documentcomplete(...)
if webbrowser1.documenttitle = submitted_page_title then
  parse(webbrowser1.documenttext)
  if counter <> 101 then
    webbrowser1.documenttext = mycode
    ' press submit button code should be here
  end if
end if
end sub

prv sub parse(html as string)
' parse html
counter += 1
end sub

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i just want the button to be clicked automatically without making a BIG change..i think you understand

Hi kleinma,
I have been following this post for couple of days. I would like to mention that I have never seen anyone so HELPFUL.. You rock!!:thumb:

well, i got a problem in doing the same thing. I am using Vb.net 2005 express edition, wherein i am creating an application, that would send in data to the web form fields and get the results. It's actually a ASP.NET webpage, that calculates based on the values entered in the fields.

I don't know why Mmhtml code, didn't work for me, so i am working with the web browser control 2.0, with the following code:

WebBrowser1.Document.All.Item("IDTextBox").InnerText() = "202"
WebBrowser1.Document.All.Item("PasswordTextBox").InnerText() = "123"
WebBrowser1.Document.All.Item("SelectButton").InvokeMember("click")

PROBLEM: after I execute this code, the web browser loops it, making the page to reload, input the variables and again click it.. it forms a vicious circle..:confused:

any suggestions..

What event did you put that code in?

ohh great!!
:D salutations to you...

you are online..

well i posted this code as follows:


Private Sub WebBrowser1_DocumentCompleted(ByVal sender As Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted

WebBrowser1.Document.All.Item("IDTextBox").InnerText() = "202"
WebBrowser1.Document.All.Item("PasswordTextBox").InnerText() = "123"
WebBrowser1.Document.All.Item("SelectButton").InvokeMember("click")
End Sub

I am really new to this field, any help would work a long way for me..

Are you able to provide me the URL that you are trying to work with? That makes it easier for me to be able to give you a 100% working answer.

The problem most likely lies somewhere in the fact that an ASP.NET page posts back to itself, not a different page, which could cause the loop you describe.

well.. its only for you..

[REMOVED]

if you have it saved, i can remove it from the public access.. This forms a part of high profile research group..i hope you understand my situation..:)

yeah I saved it.

You need a mechanism, either in your VB app, or in the ASP.NET page, to let you know the current state of the ASP.NET page.

For example, the only visual indicator I see on that page to let me know if an ID/Password were submitted, is the label that says "Select a building" which then changes to "You selected: oh god in Atlanta, Georgia" when I put in the ID/Password.

If you have access to the ASP.NET source code, I would either add a hidden field to indicate if an ID/Password has been submitted. The VB app could then read the value of that hidden field to decide if it should refill the boxes and submit, or not.

If you don't have access to the source code, you could try parsing out the HTML text to find the words "Select a building:" to indicate if you should autofill and submit, however that is more error prone and subject to break if the text on the page ever changes.

i tried stopping the navigation after i was able to invoke the submit button. But, i was not able to invoke "Click" button the next time in the same page.. :ehh:

OOps... that would hit hard on me..

If you have seen, there are multiple button on the webpage, i don't know if i could save the page temporarily, and hit the next button to execute the complex calculation....:mad:

Any other way out of this mess..

It actually selects the building on the first button, then we are allowed to change parameters, then the next button would be for saving the changed parameters for that selected building.. Few more buttons that would lead you to next page, where we got to do the same for other calculation.. ..:cry:

well do you have access to the ASP.NET source code?

Yeah, but i ain't know much about ASP.NET, but i know it is in complete mess.
So i was trying to work other way out..

I have the aspx file attached.. If you could have a look at it..

Any solutions... :confused:

I don't need the aspx file really.

My suggestion would be that you add a hidden field to the aspx page. Call that field hdnStatus

In the code behind for the aspx page, in the button click code for each button have that button set the hdnStatus field. Then your VB app that hosts the WB control can query that field to get the current status:

For example

When user puts in ID/Password and clicks the button to get the building, the ASPX page fires the codebehind code for the button click event of that button. In that code you verify ID/Password and if its correct you display the building they selected. You should also there set the hdnStatus field with some value to indicate there has been a successful login. Lets say you set the hidden field text to "BUILDING_RETRIEVED"

Then in your VB code, in the documentcompleted event of the WB control, look at the value of hdnStatus in the webpage. If its blank, then that should indicate nothing has been done, and the ID/Password should be automatically entered and the button should be clicked. If it says "BUILDING_RETRIEVED" then it should not autofill and click the button again.

You could use this same approach for all the buttons on the page. Just set different values in the hidden field, and that value can be looked at by your VB app so it can take the proper action.

Hope this makes sense.

well makes a lot sense..:blush: i would try to work on it..

One more dumb question :rolleyes:
Is there a way to trigger "code behind code" that leads me to the solution without clicking the button? If yes, it would make my life a lot easier..