javascript - disabling submit button till input fields are validated -

i have disabled submit button in guestbook. has 2 fields[name(textbox)&comment(textarea)].it has 2 other fields id(primary key) , date.the function is:

function frmvalidate() { var nmchk=document.forms["guestform1"]["name"].value; var cmntchk=document.forms["guestform1"]["comment"].value; if (nmchk.length==0)         {         var namep = document.getelementbyid("namep");         namep.innerhtml="name must filled out";         return false;         } else if (cmntchk.length==0)         {         var cmntp = document.getelementbyid("cmntp");         cmntp.innerhtml="comment must filled out";         return false;         } else     {     document.getelementbyid("sbmt").disabled=false;     return true;     } 

}

i have called function in places: body tag's onload,button tag's onclick. still not working , blank entries being stored in database.

you dont need disable submit button

you gain noting it. ( alerting user , running script etc...)

instead -- submit button should stop regular behaviour code :

<input type="submit" onclick="return frmvalidate();"/>

meaning :

when press button , execute function yielding true or false , if it's true (only) continue server.