html - Redirecting to URL in external Javascript function not working -

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i'm trying program relatively simple site, html , javascript skills pretty basic. basically, i'm trying create page user asked question answer typing form. external javascript function users answer compared right one, , if they're same, user supposed redirected different site. here's form in html document:

<form name="myform" action="" method="get"> answer:     <input type="text" name="inputbox" value="">     <button onclick="checkanswerexact(this.form)"> submit </button>  </form>

my javascript function looks this:

function checkanswerexact(form){    //get answer   var x = form.inputbox.value;   //convert answer string   var testansw =x.tostring();   //define right answer   var rightansw = "rightanswer";   //check if same   if (testansw.tolowercase() == rightansw.tolowercase() ){      alert("the answer right.");     window.location.href = 'https://www.reddit.com/';   } //what if answer's right   else {     alert("the answer wrong.");   } //what if answer's wrong   }

as example site redirect to, chose reddit. alerts work right, comparison of strings okay. i've been googling while , read through bunch of forums nothing seemed work me. i've tried document.location=url, , window.replace(url) both inside if-else statement , outside , nothing seems work, window reloads. work window.open(url), don't want open in new tab. i'm using chrome browser, if that's relevant.

i'd love help, i've been researching hours , i'm pretty sure it's mistake made can't see.
cheers!

allright, figure out issue code. add return false on onclick event button. code become

<button onclick="checkanswerexact(this.form); return false;"> submit </button>

and change 

 window.location.href = 'https://www.reddit.com/';

to

 window.location = 'https://www.reddit.com/';

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