Question Re: Barcode scanner without pressing Scan Button in Technology Q&A

Barcode scanner without pressing Scan Button

surya_jangareddy — Sat, 07 Jul 2018 05:43:07 GMT

Hi All,

Iam using Barcode scanner in my fiori app. Every thing is working fine....

But my client requirement is once he finish the scan, then immediately again another scan should be opened with out pressing button.

I done this requirement by using firePress event.But i am getting an issue like below.

First time when i press button and cancel, then from next time only its working as per requirement

So, how can i achieve it from first press onwards..

Thanks in advance,

Surya..

Re: Barcode scanner without pressing Scan Button

rakesh2901 — Sat, 07 Jul 2018 08:04:11 GMT

How are you calling the second scan??

Re: Barcode scanner without pressing Scan Button

gregorw — Sat, 07 Jul 2018 13:02:39 GMT

Does the cancel fire the scanFail event?

Re: Barcode scanner without pressing Scan Button

surya_jangareddy — Tue, 10 Jul 2018 03:34:50 GMT

Hi,

First thanks to rakesh and Gregor for your response.

You can find my code below.

In View:

var oScanButton = new sap.ndc.BarcodeScannerButton({id: "barc",
provideFallback: true,
visible: true,
scanSuccess: onScanSuccess,
scanFail: onScanError,
inputLiveUpdate: onScanLiveupdate
});

now in function onScanSuccess.

function onScanSuccess(oEvent)

{
if (oEvent.getParameter("cancelled"))
{
sap.m.MessageToast.show("Scan cancelled", { duration:1000 });
}
else

{
aData.push({Sname: oEvent.getParameter("text")}); // Push data to Model
oModel.setData({modelData: aData}); // Set Model

sap.ndc.BarcodeScanner.closeScanDialog();

sap.ui.getCore().byId("barc").getAggregation("_btn").firePress();
}

}

this code is working fine like below.

1. when i press scan button ,

come back and cancel dialog.

now again press scan button . then only the repeated scan is working fine with out pressing scan button next time onwards.

otherwise i am getting an message like "barcode scan is already started."

Please help me.

Regards,

Surya.

Re: Barcode scanner without pressing Scan Button

surya_jangareddy — Thu, 12 Jul 2018 02:53:41 GMT

sap.ndc.BarcodeScanner.closeScanDialog();

sap.ui.getCore().byId("barc").getAggregation("_btn").firePress();

Re: Barcode scanner without pressing Scan Button

rakesh2901 — Thu, 12 Jul 2018 09:01:21 GMT

Hi Surya,

As much as I understood your requirement, I think you should not fire the button again

sap.ui.getCore().byId("barc").getAggregation("_btn").firePress();/// remove this

instead call the:

sap.ndc.BarcodeScanner.scan

directly after first successful scan.

Hope I understood your requirement correctly. Let me know if it worked.

Re: Barcode scanner without pressing Scan Button

surya_jangareddy — Mon, 16 Jul 2018 09:59:49 GMT

Hi Rakesh,

Initially i have written the code as you suggested.But its not triggering Scan second time without pressing button.