Create a fill-in web form that uses a JavaScript implementation of the Luhn formula to check for

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Create a fill-in web form that uses a JavaScript implementation of the Luhn formula to check for typos in credit card numbers.

Figure 14.15:

Adder  Adder 12 First addend  function doAdd () { 34 Second addend argA argB x = document.getElementById('sum') parseInt (document.adder.argA.value) parseInt (document.adder.argB.value) Calculate %3D 12 plus 34 is 46 while (x.hasChildNodes ()) x.removeChild(x.lastChild) // delete old content t = document.createTextNode (argA +

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