Need Asistance topic

I created a simple app that checks addresses.

The address then needs to be redirected to google maps, i found an easy way to redirect it to it using this code

HTML Code:

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<a href="https://maps.google.com/maps?q=ADDRESS">

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this code if for browser test purposes. i use this code on the actual app

HTML Code:

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<a href="geo://0,0?q=ADDRESS" data-rel="external">

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The selected address is being stored in an ID called NewAddr that ive located on the javascript

Code:

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function map() {
  var oldAddr = document.getElementById("oldAddr");
  var newAddr = document.getElementById("newAddr");
  newAddr.innerHTML = h[oldAddr.value];
}

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i need help to know how can i use the data that has been chosen from the ID (newAddr) to the selected <a href=

Regards.
Amir.