Issues with the PhoneGap BarcodeScanner are leading to the freezing of the iOS application

I am currently working on integrating a QR scanner into my PhoneGap app using the BarcodeScanner plugin from PhoneGap Build. However, I am facing an issue where the app freezes after completing a scan and triggering an alert.

The JavaScript code involved is as follows:

var options=""
options += '<p>'+formData["form"][formPart][1]+'</p>'
options += '<a data-role="button" data-rel="dialog" formPart="'+formPart+'"id="Cap-'+formPart+'">Capture Image</a>'
options += '<p id="Cap-Data"></p>'
$('#formContent').append(options);
$('#Cap-'+formPart).on("tap",function(event){
var scanner = cordova.require("cordova/plugin/BarcodeScanner");
scanner.scan(
 function (result) {
  var FP = $(this).attr("formPart");
  $('#Cap-Data').html(result.text);
   alert(result.text);
  }, 
  function (error) {
   alert("Scanning failed: " + error);
  }
 );
});

Any assistance with resolving this issue would be greatly appreciated.

Answer №1

One issue is that functions like alert or prompt pause the execution completely until they are done. A solution is to place the alert code within a setTimeout() function. You can set the timeout to 0 ms so that it happens immediately but does not disrupt the flow of the program.

setTimeout(function() {
  alert(result.text);
}, 0);

For more information on why using setTimeout(fn, 0) can be helpful in these cases, check out this question.

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