[Solved] operations with javascript in html document
[ad_1] You are getting NaN because of this: var altezza = document.getElementById(‘altezza’); var base = document.getElementById(‘base’); (base*altezza/2) getElementById() does exactly that – gets the element. You just need to get the value from the element e.g. var altezza = document.getElementById(‘altezza’).value; [ad_2] solved operations with javascript in html document