Javascript: Find all elements on page and add the same CSS -


currently learning javascript , trying create expanding menu.

i'm trying find elements of same class , setting css value on click elements in nodelist. error see in console is:

cannot read property 'style' of undefined

i know it's loop not setting variable correctly; not sure is.

jsfiddle

http://jsfiddle.net/dxv68/

html

<div class="master">  <a href="#" id="btn-nav">     <span></span>     <span>menu</span>     <span></span> </a>  <nav id="main-nav">   <div class="wrapper">   <div class="background">   <div class="slice"></div>   <div class="slice"></div>   <div class="slice"></div>   <div class="slice"></div>    <div class="slice"></div>   <div class="slice"></div>   <div class="slice"></div>   <div class="slice"></div>    <div class="slice"></div>   <div class="slice"></div>   <div class="slice"></div>   <div class="slice"></div> </div> </div> </nav>  </div><!-- end master -->

css

@import url(http://fonts.googleapis.com/css?family=droid+sans);   body {     background: #2980b9;     font-family: 'droid sans', sans-serif; }   #btn-nav {     position:absolute;     left:10px;     top:10px;     width:30px;     height:30px;     display:block;         z-index:1; }  #btn-nav span:nth-child(2) {     top:10px; }  #btn-nav span:nth-child(3) {     top:20px; }  #btn-nav span {     height: 4px;     width: 30px;     background: white;     content: "";     text-indent: -999em;     display:inline-block;     position:absolute;     zoom: 1;     top:0px;     left:0px;     text-align:center;     -webkit-transition: top .3s cubic-bezier(0.165,.84,.44,1);         -webkit-transform: rotate(0deg); }   #btn-nav:hover > span {     top:10px;         -webkit-animation: rotateani .5s 1s forwards;  }  #btn-nav:hover > span:nth-child(1) {   -webkit-animation: rotateani .5s .5s forwards, expandani .3s .8s forwards; }  #btn-nav:hover > span:nth-child(2) {   -webkit-animation: rotateani .5s .5s forwards, expandani-2 .3s .8s forwards; }  #btn-nav:hover > span:nth-child(3) {   -webkit-animation: rotateani .5s .5s forwards, expandani-3 .3s .8s forwards; }   @-webkit-keyframes rotateani {   0% {-webkit-transform: rotate(0deg);}   100% {-webkit-transform: rotate(90deg);} }  @-webkit-keyframes expandani {   0% {left:0;}   100% {left:-10px;} }  @-webkit-keyframes expandani-2 {   0% {left:0;}   100% {left:0px;} }  @-webkit-keyframes expandani-3 {   0% {left:0;}   100% {left:10px;} }   #main-nav {   position:fixed;   left:0;   top:0;   display:block;   width:100%;   height:100%;   z-index:-1; }  #main-nav .wrapper {   display:table;   width:100%;   height:100%; }  .slice {   width:25%;   height:30%;   float:left;   background:black;   opacity:0;   -webkit-transition: 1s; }  .background {   position:absolute;   left:0;   top:0;   width:100%;   height:100%;   z-index:-1; }

js

(function () {     'use strict';      var menubtn = document.getelementbyid('btn-nav');     var slice = document.queryselectorall('.slice');      for(var = 0; <= slice.length; i++) {         var boxes = slice[i];     }      menubtn.addeventlistener('click', function() {         boxes.style.opacity = 1;     }, false);  }());

you need place loop inside event, it's doing setting last slice's opacity.

var menubtn = document.getelementbyid('btn-nav'); var slice = document.queryselectorall('.slice');  menubtn.addeventlistener('click', function() {     for(var = 0; < slice.length; i++) {         slice[i].style.opacity = 1;     } }, false);

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