script.js


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/// <reference lib="dom" />

document.addEventListener("keypress", ev => {
    if (!(document.activeElement instanceof HTMLInputElement)) {
        if (ev.code.startsWith("Digit"))
            document.forms.buy_product.pcode.value += ev.code.substring(5)
        if (ev.code == "Enter")
            document.forms.buy_product.submit()
    }
})