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answered Feb 14, 2014 at 20:28
Most of the time barcode scanners act like a keyboard - they "type" the result. You capture it by either listening to keypress events, or by listening to changes in an input field.
More information on the particular technology used to capture the barcode would be required to answer this question in more detail.
Content Under CC-BY-SA license QR and barcode scanner using HTML and Javascript
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