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Check DOM property before access


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Is there a way to check if the DOM property exist before accessing it? I'm getting error when trying to access a class which do not exist. In this example, I have a collection of anchor tags. Some anchor has className while some do not. When I loop, AutoIT throw an error on anchors which do not have className

Code with error:

Local $oTags = _IETagNameGetCollection($oResult, "A")

For $tag in $oTags
If $tag.className = "ABC" Then
; Do something
EndIf
Next

I'm looking for something like this (or any other solution)

Local $oTags = _IETagNameGetCollection($oResult, "A")

For $tag in $oTags
If $tag.isProperty(className) AND $tag.className = "ABC" Then
; Do something
EndIf
Next

Thanks.

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You could add a COM error handler and set @error if the property does not exist.

My UDFs and Tutorials:

Spoiler

UDFs:
Active Directory (NEW 2022-02-19 - Version 1.6.1.0) - Download - General Help & Support - Example Scripts - Wiki
ExcelChart (2017-07-21 - Version 0.4.0.1) - Download - General Help & Support - Example Scripts
OutlookEX (2021-11-16 - Version 1.7.0.0) - Download - General Help & Support - Example Scripts - Wiki
OutlookEX_GUI (2021-04-13 - Version 1.4.0.0) - Download
Outlook Tools (2019-07-22 - Version 0.6.0.0) - Download - General Help & Support - Wiki
PowerPoint (2021-08-31 - Version 1.5.0.0) - Download - General Help & Support - Example Scripts - Wiki
Task Scheduler (NEW 2022-07-28 - Version 1.6.0.1) - Download - General Help & Support - Wiki

Standard UDFs:
Excel - Example Scripts - Wiki
Word - Wiki

Tutorials:
ADO - Wiki
WebDriver - Wiki

 

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_IEErrorHandlerRegister() makes this easy. Or use the latest beta that makes COM errors non-fatal.

Dale

Free Internet Tools: DebugBar, AutoIt IE Builder, HTTP UDF, MODIV2, IE Developer Toolbar, IEDocMon, Fiddler, HTML Validator, WGet, curl

MSDN docs: InternetExplorer Object, Document Object, Overviews and Tutorials, DHTML Objects, DHTML Events, WinHttpRequest, XmlHttpRequest, Cross-Frame Scripting, Office object model

Automate input type=file (Related)

Alternative to _IECreateEmbedded? better: _IECreatePseudoEmbedded  Better Better?

IE.au3 issues with Vista - Workarounds

SciTe Debug mode - it's magic: #AutoIt3Wrapper_run_debug_mode=Y

Doesn't work needs to be ripped out of the troubleshooting lexicon. It means that what you tried did not produce the results you expected. It begs the questions 1) what did you try?, 2) what did you expect? and 3) what happened instead?

Reproducer: a small (the smallest?) piece of stand-alone code that demonstrates your trouble

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