from pyscript import document

def bereken(event):
    output = document.querySelector("#output")

    try:
        getal = document.querySelector("#getal").value

        if getal == "":
            output.innerText = "Fout: Vul een binair getal in."
            return

        for teken in getal:
            if teken not in "01":
                output.innerText = "Fout: Vul alleen 0 en 1 in."
                return

        decimal = 0

        for i in range(len(getal)):
            lengte = len(getal)
            cijfer = int(getal[i])
            macht = lengte - 1 - i
            decimal += cijfer * (2 ** macht)

        output.innerText = f"De decimale uitkomst is: {decimal}"

    except ValueError:
        output.innerText = "Fout: Vul geldige getallen in."


def reset(event):
	reset = document.querySelector("#reset")

	document.querySelector("#getal").value = ""
	document.querySelector("#output").innerText = ""