I'm less familiar with JavaScript, and by extension, I'm less familiar with JS Frameworks. So I needed to add inputs from three <input/> and show addition in fourth <input/>

So ripped off a SO answer, didn't work, though his JSFiddle is working perfectly.

Ripped off another SO answer, but this time jQuery, but that didn't work too.

the cycle continues till I find that I do not have a id="" in my code and I'm trying to use getElementById.