JavaScript Javascript (?) error in MS Access

[OzFoxy]

Hi, my knowledge of js is zero. My need is to create QR Codes in an access database and store them on disk as an image (.png) for inclusion in reports.
I am using sample code downloaded from the internet and the QR Code is created OK and displayed in an image control - Line 120.
The next step, Line 140, fails with error "Unable to get property 'src' of undefined or null reference".

120       oWebBrowserObject.Document.parentWindow.execScript (sCmd)

130        If IsNull(Me.ID) = False Then
140            oWebBrowserObject.Document.parentWindow.execScript ("var qr = $('#qrcode img')[0].src;")
150            sQRCode = oWebBrowserObject.Document.Script.qr
160            sQRCode = Replace(sQRCode, "data:image/png;base64,", "")    'Remove the initial string portion that isn't relevant
170            If sQRCode <> "" Then
180                WriteByteArrayToFile DecodeBase64(sQRCode), sQRCodesPath & Me.ID & ".png"
190            End If
200        End If

Any advice will be appreciated.

 

[EkBass]

One thing that comes to my mind is, that QR plugin needs some time to render the image first.
Basicly, you are moving too fast with your code.

Just place a short sleep, 500ms or something at line 125 and you might be able to solve this.

 

[OzFoxy]

One thing that comes to my mind is, that QR plugin needs some time to render the image first.
Basicly, you are moving too fast with your code.

Just place a short sleep, 500ms or something at line 125 and you might be able to solve this.

Thanks EkBass. The solution I got from another Forum was a windows registry edit to create a new DWord in FeatureBrowserEmulation (msaccess.exe with a value of 11001).
Your advice also makes eminent sense, so I have implemented that as well.
All good. Working well. Now I know two things about js.

 

[EkBass]

Next lesson: Asynchronous & Synchronous