Constructor
new GrabbaUtil()
Access Grabba utilities via grabba.util
Methods
convertJpegToBase64(onSuccess, onError, imageData, offset)
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);integerArrayToHexString(array)
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);