How to set the selected field of combo box within the view

[ParPar]

I have two options in a combo box.

<select id="selLang">
        <option value="/en" >english</option>
        <option value="/fr" >french</option>
    </select>
 

When i choose the second option the page is refreshed and the selected option isn't displayed in the top of the combo box (i mean, as the selected item.)it's funny coz the page is in french and in the select box it's "english".
I want to set the selected option to be the selected option which is in the top of the combo box- within the view.
so my question is just how can i do it?
or maybe i have to create a cookie? and if so -how do i do t-h-a-t?
actualy i have this:

var urlString = window.location.host; 
var Lang = $("#selLang")[0].value; 
window.location = "http://" + urlString + Lang;
 

and this: window.location.pathname - is exactly the value of the option.(and it remains the same after the page refreshing.) that's how i was thinking to get over the problem and avoid using in cookie.
Perhaps it's a silly question, but i'm quite new in this region.

Thanks in advance!