new GrabbaUtil()
Access Grabba utilities via grabba.util
Methods
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convertJpegToBase64(onSuccess, onError, imageData, offset)
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Convert jpeg or JPEG2000 image data to a base64 string with a "data:image/png;base64," header, ready for presentation.
Parameters:
Name Type Description onSuccess
function Called on success with the following parameters:
{String} png image data encoded as a base64 String with "data:image/png;base64," header, ready for use as image source.onError
function Called on error with the following parameters:
{String} error description.imageData
Array.<int> Image data. offset
int Offset into the image data when the image begins. Example
//Convert a JPEG or JPEG2000 image to Base64 ons.grabba.util.convertJpegToBase64(function(imageBase64) { document.getElementById("photo").src = imageBase64; }, function(errorString) { alert('on error ' + errorString); }, data, offset);
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integerArrayToHexString(array)
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Convert an integer array to base 16 hex string.
Parameters:
Name Type Description array
Array.<int> of integers to convert. Example
//Generate a hex string from returned proxcard data var hexString = ons.grabba.util.integerArrayToHexString(proxcard.data);