Subject: Watir Javascript popup handler: works with popups from links, not from buttons From: jeffz_2002 yahoo.com Date: Mon, 12 Dec 2005 10:07:39 +0900 (long post!) Hello, I'm creating a little helper class for Watir that can read the text from an IE Javascript popup and click buttons. It works great for popups that are created by links. E.g., for the following HTML: <script language="Javascript"> function showAlert() { alert("Alert showing!"); }

Link:
Click this link

I can put the following in a Watir script: require 'watir' @ie = Watir::IE.new @ie.goto("file://C:/test.html") puts "Working with popup from links:" jsh = JavascriptPopupHandler.new(@ie, 'OK') jsh.pauseDuration = 0.1 jsh.handle { @ie.link(:text, "Click this link").click } puts "Here's the text that was showing in the popup: #{jsh.text}" The above code outputs:

Working with popup from links: Here's the text that was showing in the popup: Alert showing!

The jsh.handle starts a monitor thread that looks for the Javascript popup, and then executes the block. When it finds a popup, it can pull the text out of the popup and click the appropriate button (by the button caption). It works when I pass in a link click in the block. The code doesn't work for form buttons though, and I can't figure out why. E.g., for the following html:

The following doesn't work:

# This next call hangs when the popup pops up. puts "from button:" jsh.handle { @ie.button(:value, "Click this button").click } puts "Here's the text that was showing in the popup: #{jsh.text}" This is a bit annoying, and it might be easily fixable ... I was hoping someone might have some ideas about how to fix it. Here's the scratch code: =========================================== require 'watir/winClicker.rb' # Need to redefine the supplied getWindowHandle in Winclicker class WinClicker # Stop printing to console. def puts(s) # nothing end # getWindowHandle # Purpose: return the handle to the window with desired title and class. # Returns -1 if no match. # # Code is taken from winClicker.rb and modified. # Note: Needed to redefine getWindowHandle, since it returns a window with # a caption that matches using a regex, instead of an exact match. # def getWindowHandle(title, winclass = "" ) winclass.strip!

]

# Callbacks callback_enum_windows = @User32['EnumWindows', 'IPL'] callback_get_class_name = @User32['GetClassName', 'ILpI'] callback_get_caption_length = @User32['GetWindowTextLengthA' ,'LI'

# format here - return value type (Long) followed by parameter types - int in this case # see http://www.ruby-lang.org/cgi-bin/cvsweb.cgi/~checkout~/ruby/ext/dl/doc/dl.txt? callback_get_caption = @User32['GetWindowTextA', 'iLsL' ] len = 32 # seemingly arbitrary number buff = " " * len bContinueEnum = -1

# Main callback - block of code to execute for all open windows. callback_enum_windows_proc = DL.callback('ILL') do |hwnd,lparam| # sleep 0.05 ....

<-- original code had sleep in here, not sure why

r, rs = callback_get_class_name.call(hwnd, buff, buff.size) found_win_class = rs[1].to_s.strip

if ( winclass == "") or ( found_win_class == winclass ) # Get the caption (allocate buffer space, then load) caption_length, a = callback_get_caption_length.call(hwnd) captionBuffer = " " * (caption_length + 1) t, textCaption = callback_get_caption.call(hwnd, captionBuffer, caption_length + 1) the_caption = textCaption[1].to_s return hwnd if (title == the_caption) end bContinueEnum end # do

# return value

# execute the callback for all open windows. r,rs = callback_enum_windows.call(callback_enum_windows_proc, 0) return bContinueEnum end end # end WinClicker redefinition

class JavascriptPopupHandler JS_POPUP_TITLE = "Microsoft Internet Explorer" DEFAULT_PAUSE_BEFORE_FINDING_WINDOW_DURATION = 0.8 def initialize(parent_ie_session, caption_of_button_to_push) @parent_hwnd = parent_ie_session.ie.hwnd @caption_of_button_to_push = caption_of_button_to_push @handle_was_called = false @popup_text = nil @pause_before_finding_popup = DEFAULT_PAUSE_BEFORE_FINDING_WINDOW_DURATION end def pauseDuration=(duration = DEFAULT_PAUSE_BEFORE_FINDING_WINDOW_DURATION) raise "Duration must be >=0" if (duration < 0) @pause_before_finding_popup = duration end

# handle # Does the action which displays the popup, then gets the popup # text and clicks the appropriate button. def handle( &action ) @handle_was_called = true # Calling the action blocks until the popup dialog box is closed, # so we need to create a thread that looks out for the dialog box # before the action is executed. Thread.new do sleep @pause_before_finding_popup wc = WinClicker.new javascriptPopupHwnd = wc.getWindowHandle(JS_POPUP_TITLE) raise "No popup matching #{JS_POPUP_TITLE} found" if (javascriptPopupHwnd == -1) raise "Got wrong popup?" if (wc.getParent(javascriptPopupHwnd) != @parent_hwnd) # Get the button button_hwnd = wc.getChildHandle(javascriptPopupHwnd, @caption_of_button_to_push) raise "Can't find button #{@caption_of_button_to_push}" if (button_hwnd == -1) # Store info about the popup. @popup_text = wc.getStaticText_hWnd(javascriptPopupHwnd) # Click the button to continue. wc.clickButtonWithHandle(button_hwnd) end # The thread is now looking for a popup dialog, so when we do # the action and the dialog box appears, the thread will # pick it up. action.call end # After the action has occurred, and the handler has clicked # the appropriate button, we can get information about the popup. def text raise "Handle not called yet" if (@handle_was_called == false) @popup_text end end

require 'watir' @ie = Watir::IE.new @ie.goto("file://C:/test.html")

puts "Working with popup from links:" jsh = JavascriptPopupHandler.new(@ie, 'OK') jsh.pauseDuration = 0.1 jsh.handle { @ie.link(:text, "Click this link").click } puts "Here's the text that was showing in the popup: #{jsh.text}" # This next call hangs when the popup pops up. puts "from button:" jsh.handle { @ie.button(:value, "Click this button").click } puts "Here's the text that was showing in the popup: #{jsh.text}" @ie.close =========================================== Here's the test HTML file: =========================================== <script language="Javascript"> function showAlert() { alert("Alert showing!"); }

testing

Handler can deal with the link:
Click this link

---

Handler can't deal with the form submit button:

=========================================== Any insight would be appreciated! Jeff