Why does calling this Javascript function submit my form? -

i have form validation script. unless conditions met, ambiguous function associated form.onclick returns false (form doesn't submit). have function upon error append error message errorlog div.

  function adderror (msg) {     msg = document.createtextnode(msg);     br = document.createelement("br");     errorlog.append(msg);     errorlog.append(br);     alert("yes");   } 

if error found, calling function submits form. script doesnt enter function, submits data , refreshes. realize there error in function, cant seem figure out.

edit: more of code

  form.onsubmit = function ()    {     if (namecheck(fname, lname))       return true;      return false;    }; 

function checks if "name" field valid:

function namecheck (fname,lname) {   if (("/\d/").test(fname) || ("/\d/").test(lname))   {     adderror('your name cannot contain numbers.');     valid = false;   } } 

you're not stopping form submitting.

use e.preventdefault() temporarily stop form submitting, if form correct use this.submit() finish submitting form

form.onsubmit = function (e) {     e.preventdefault();     if (namecheck(fname, lname)) {         this.submit();         return true;     }     return false;  }; 

also, namecheck never resolve true, doesnt return anything. should this

function namecheck (fname,lname) {   if (("/\d/").test(fname) || ("/\d/").test(lname)) {     adderror('your name cannot contain numbers.');     return false;   }   return true; }