javascript - Jquery Sticky navigation fires up when meets certain condition -


i have created sticky navigation , works fine. however, want sticky navigation fires or run when browser lower or equal 770px.

so far, code

$j = jquery.noconflict();  $j(document).ready(function() {   var navoffset = $j(".main-nav").offset().top;   var wi = $j(window).width();   var sticky;   $j(".responsive-icon").wrapinner('<div class="value"></div>');   $j(".main-nav").wrap('<div class="nav-placeholder"></div>');   $j(".nav-placeholder").height($j(".main-nav").outerheight());    function stickyfunction() { /*sticky navigation function*/     sticky = $j(window).scroll(function() {               var scrollpos = $j(window).scrolltop();               if (scrollpos >= navoffset) {                 $j(".main-nav").attr("id", "fixed-menu");               } else {                 $j(".main-nav").removeattr("id");               }             });     return sticky;   }    if(wi <= 770) { /* suppose fires if browser lower 770px */       stickyfunction();     }   $j(window).resize(function() { /*suppose fires if browser resize*/     if(wi <= 770) {       stickyfunction();     }   }); }); 

how call stickyfunction run when browser width meets condition?

thanks!

simply use sticky scroll event , try use scroll event inside window resize event function not fired in resize window .. use this

/*sticky navigation function*/    var  stickyfunction= (function() {               var scrollpos = $j(window).scrolltop();               if (scrollpos >= navoffset) {                 $j(".main-nav").attr("id", "fixed-menu");               } else {                 $j(".main-nav").removeattr("id");               }             }); 

instead of

function stickyfunction() { /*sticky navigation function*/     sticky = $j(window).scroll(function() {               var scrollpos = $j(window).scrolltop();               if (scrollpos >= navoffset) {                 $j(".main-nav").attr("id", "fixed-menu");               } else {                 $j(".main-nav").removeattr("id");               }             });     return sticky;   } 

and make event window scroll

$j(window).on('scroll', stickyfunction); 

and in resize event

$j(window).on('resize',function() { /*suppose fires if browser resize*/  wi = $j(window).width();          if(wi <= 770) {       stickyfunction();     }   });