Sure. If it's about what you see as the limitations of Javascript maybe let us know what you see those as being? We've put a fair bit of effort into making our app respond (form submission, page updates, form reset, even audible feedback) with no further action from the operator besides the scan taking place.
Happy to share what we've learned through that process. - James On 4/10/2010, at 3:07 PM, Aaron Cooper wrote: > Thanks James, > > Again, I am well aware it is no different from a keyboard. > > Noone's really reading the primary gotcha of my post so I'll just close this > one now. > > Cheers people > Aaron > ----- Original Message ----- > From: James McGlinn > To: [email protected] > Sent: Monday, October 04, 2010 3:00 PM > Subject: Re: [phpug] [OT] - USB Barcode Scanner to Web > > Many of the promoters using Eventfinder for ticketing use our web-based > ticket validation system at http://pro.eventfinder.co.nz. > > They plug in a USB scanner, and scan ticket barcodes directly into the web > application. > > Javascript detects the characters typed, handles changing focus amongst the > fields as needed, and finally submits the code via Ajax and updates the parts > of the screen required to provide feedback to the operator. > > It's straightforward - as Olwen pointed out the device just sends characters > into the input buffer exactly like a keyboard. > > > Kind regards, > James McGlinn > __________________________________ > CTO > Eventfinder Limited > Suite 106, Heards Building > 2 Ruskin Street, Parnell, Auckland 1052 > Phone: +649 365 2342 > Mobile: +6421 633 234 > > [email protected] | www.eventfinder.co.nz > > > <eventfinder.png> > > On 4/10/2010, at 1:51 PM, Cliff Black wrote: > >> This is correct. >> Barcode scanners emulate keyboards, so each number/char entered is a >> ‘keypress’ – usually followed by a carriage return (this is often changeable >> in the scanner units configuration) when the code has finished read. >> This allows you to write javascript to suit the behaviour you require. >> If you’re using a form with multiple fields, and have the carriage return >> setting on your scanner, I would recommend disabling the ‘submit on enter’ >> action and rebind the submit to a specified element (button/image) only.. >> This will prevent the scanner triggering a submit prematurely. >> ~ C >> From: [email protected] [mailto:[email protected]] On Behalf >> Of Olwen Williams >> Sent: Monday, 4 October 2010 1:32 p.m. >> To: [email protected] >> Subject: Re: [phpug] [OT] - USB Barcode Scanner to Web >> As far as I know most barcode scanners look like keyboards. No personal >> experience, but that's what I've gathered. >> >> On Mon, Oct 4, 2010 at 12:45 PM, Aaron Cooper <[email protected]> wrote: >> Has anyone had any experience with getting USB devices to execute events on >> web pages? (Webcam would be an example) >> We have a central application and hardware that we want to enhance with a >> USB barcode scanner. A global design goal is for the application to post >> data to a new page as soon as a scan is performed, without user action. >> Javascript and hidden fields have their limitation in this respect, so I am >> thinking along the lines of ActiveX here. Just wanted to see if anyone here >> has done something similar. >> Cheers >> Aaron >> -- >> NZ PHP Users Group: http://groups.google.com/group/nzphpug >> To post, send email to [email protected] >> To unsubscribe, send email to >> [email protected] >> -- >> NZ PHP Users Group: http://groups.google.com/group/nzphpug >> To post, send email to [email protected] >> To unsubscribe, send email to >> [email protected] >> >> -- >> NZ PHP Users Group: http://groups.google.com/group/nzphpug >> To post, send email to [email protected] >> To unsubscribe, send email to >> [email protected] > > > -- > NZ PHP Users Group: http://groups.google.com/group/nzphpug > To post, send email to [email protected] > To unsubscribe, send email to > [email protected] > > -- > NZ PHP Users Group: http://groups.google.com/group/nzphpug > To post, send email to [email protected] > To unsubscribe, send email to > [email protected] -- NZ PHP Users Group: http://groups.google.com/group/nzphpug To post, send email to [email protected] To unsubscribe, send email to [email protected]
