IE Error handling

[Capel]

I'm automating an IE page and need to wait for the page to load before populating a textbox. One problem is the way IIS names the DOM objects dynamically. I have to search the DOM looking for a certain string. When I find it, I know I have the right object.

$oForm = _IEFormGetObjByName ($oIE, "form1")
   $oElems =  _IEFormElementGetCollection ($oForm)

   For $oElem in $oElems
    if StringInStr($oElem.id,"tblEditFilterstxtValue") > 0 Then
     $oTbox = $oElem
    EndIf
   Next
_IEFormElementSetValue($oTbox, $sName)

The way the page is designed, a modal popup appears, but if the popup has not loaded I get:

_IEFormElementSetValue($oTbox, "")

_IEFormElementSetValue(^ ERROR

So I added _IEErrorHandlerRegister () to the top of my script. (But the custom error handler works sometimes and not others. Odd.)

When it does work I get the following output:

@@ Debug(704) : $ErrorOutput = --> COM Error Encountered in di.au3

----> $ErrorScriptline = 2439

----> $ErrorNumberHex = 80020009

----> $ErrorNumber = -2147352567

----> $ErrorWinDescription =

----> $ErrorDescription = Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept the focus.

----> $ErrorSource = htmlfile

----> $ErrorHelpFile = C:\WINDOWS\system32\mshtml.hlp

----> $ErrorHelpContext = 0

----> $ErrorLastDllError = 0

If I put a sleep() in the code, it will usually work, but depending on the connection it could fail. So with a fast internet connection (LAN) the sleep interval can be small, but across the web, it needs to be large. I end up with a sluggish app on the LAN in order to get the script to work over the web.

So what I would like to do is put in a loop that checks for the object, but the script keeps crashing because the object is not visible/enabled or can't accept the focus.

$iTimer = TimerInit() ; Timeout timer
   While 1
    $o_Form = _IEGetObjByID($oIE, $oTbox.id)
    If Not @error And IsObj($o_Form) Then ExitLoop

    If TimerDiff($iTimer) >= 30000 Then
     MsgBox(16, "Error", "Timeout.")
     Exit
    EndIf
    Sleep(100)
   WEnd
  _IEFormElementSetValue($oTbox, $sName)

This crashes at _IEGetObjByID($oIE, $oTbox.id) because $oTbox is not accessable.

So how do I test to see if this object is accessable without having to sleep() and making my app sluggish?

The second issue is the funky behavior of _IEErrorHandlerRegister (). I did find some reference to this behavior in the forum, but not much.

[bo8ster]

1. Have a look at debugbar to ensure there is no client side processing.

2. You may want to add something like while (tag not loaded) sleep 100.

3. _IEErrorHandlerRegister () usually is good, Maybe it is not always encounting the issue.

[Capel]

Is "tag not loaded" a method of the DOM?

[PsaltyDS]

Is "tag not loaded" a method of the DOM?

No, what he's saying is don't move on until $oTbox is valid. You loop through the collection and ASSUME $oTbox was found and set correctly before going on. Instead, put that inside an outer loop that reacquires the collection and tries again until it is found:

$oForm = _IEFormGetObjByName($oIE, "form1")
If @error = 0 Then
    Do
        $oTbox = 0
        $oElems = _IEFormElementGetCollection($oForm)
        For $oElem In $oElems
            If StringInStr($oElem.id, "tblEditFilterstxtValue") > 0 Then
                $oTbox = $oElem
                ExitLoop
            EndIf
        Next
    Until IsObj($oTbox)
    _IEFormElementSetValue($oTbox, $sName)
Else
    MsgBox(16, "Error", "Failed to get 'form1'.")
EndIf

P.S. Also, I just noticed that you were not breaking out of the loop when you DID find it, so $oTbox was getting overwritten. Fixed that by adding ExitLoop inside your For/Next loop.

Edited March 19, 2010 by PsaltyDS

[Capel]

Thanks Psalty. I deleted the ExitLoop when I cleaned up the code to post in this thread, but good eye! Thanks again and I'll give this a shot.

[Capel]

Psalty,

This did not work. The nature of the modal form is that the $oTbox is an object in the DOM all the time, it is just not visible/accessible all the time. So I still need some way to test if $oTbox is accessible without causing a COM error.

[DaleHohm]

You can examine the .style.display property of the element.

Dale