html - Responsive Design - Toggle a Div's Visibility - how to integrate javascript with css @media -


i started previous thread same goal have real question , have created 2 fiddles jsfiddle #1 , jsfiddles jsfiddle #2 show problem.

i attempting use principles of responsive design adapt changing screen size. has these 2 parts

  • use css hide/show vertical menu div (main-nav-vert) using @media based on browser width.

  • use menu button hide/show same div main-nav-vert using javascript.

the problem having can find way integrate javascript @media rules. open way (but without jquery)

the problem: test these fiddles , see problem: reduce window size see impact of @media , should hide menu on left. expand window , menu should reappear. shrink window again until menu disappears. click button , menu appears. click button second time hide it. now, expanding window no longer show menu.

try #1 (jsfiddle #1)

  • javascript changes same display property of main-nav-vert @media changing.
  • javascript changes element not underlying css (as shown in inspector).
  • the element values set javascript take precedence on css property set @media , ...
  • once button pressed, @media settings no longer work - being overridden.

try #2 (jsfiddle #2)

  • javascript alternately sets new class main-nav-vert div (hidden , visible) each click of button.
  • the display property main-nav-vert set @media take precedence on display property hidden class , button not hide menu ... unless
  • i override display property using !important in visible , hidden classes, @media won't work before.

please help. there must better way. looking pure js answer, please no jquery. thanks.

is need? having hard time understanding want links here 2 different solutions.

css

.main-content {     max-width:808px;      width: auto;     padding:0 9px 0 9px; } .main-nav-vert {     display: block;     float:left;      width:145px;     border:solid 2px #00f; }  .visible{     display: block !important; }  .hidden{     display: none !important; }  @media (min-width: 450px) {        #main-nav-vert{            display: block;        }     } @media (max-width: 449px){        #main-nav-vert{            display: none;        }         .hidden{             display: none;             }     }

css

.main-content {     max-width:808px;      width: auto;     padding:0 9px 0 9px; } .main-nav-vert {     display: block;     float:left;      width:145px;     border:solid 2px #00f; }  .visible{     display: block !important; }  .hidden{     display: none !important; }  @media (min-width: 450px) {        #main-nav-vert{            display: block;        }     } @media (max-width: 449px){        #main-nav-vert{             display: none !important;        }     }  #main-nav-vert{      display: none; }

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