jquery - Javascript vertically centering the active element -


i have carousel in website doing, need implement function center image vertically when item active, function this:

function vertically_centred(first_box_id, second_box_id){     window.onresize = function() {         var height1 = document.getelementbyid(first_box_id).offsetheight;          var height = document.getelementbyid(second_box_id).offsetheight;          var total = (height / 2 ) - (height1 / 2);          var color = document.getelementbyid(first_box_id);         color.style.top = total + "px";     };  }

i have 3 items 2 box inside different ids, function works perfectly, when carousel changes next item function doesn't work have implemented function adding in html file:

<script>     vertically_centred('text-1', 'item-1');     vertically_centred('text-2', 'item-2');     vertically_centred('text-3', 'item-3'); </script>

i think needs detect if item active use function , not know how it.

html:

<div id="mycarousel" class="carousel">      <ol class="carousel-indicators">         <li class="active" data-target="#mycarousel" data-slide-to="0"></li>         <li data-target="#mycarousel" data-slide-to="1"></li>         <li data-target="#mycarousel" data-slide-to="2"></li>     </ol>      <div class="carousel-inner">          <div id="item-1" class="active item">              <div class="container">                 <div id='text-1' class="text-center-resizable">                     <img src="images/welcome_img.png" alt="cover">                     welcome test1                 </div>             </div>          </div>          <div id="item-2" class="item">              <div class="container">                 <div id="text-2" class="text-center-resizable">                     <img src="images/welcome_img.png" alt="cover">                     welcome test2                 </div>             </div>          </div>          <div id="item-3" class="item">              <div class="container">                 <div id="text-3" class="text-center-resizable">                     <img src="images/cover.jpg" alt="cover">                     welcome test3                 </div>             </div>          </div>     </div>       <a href="#mycarousel    " class="left carousel-control" data-slide="prev"><span class="glyphicon glyphicon-chevron-left"></span> </a>     <a href="#mycarousel" class="right carousel-control" data-slide="next"><span class="glyphicon glyphicon-chevron-right"></span> </a> </div>

css

/* big screen min size 13px , max when     screen bigger 16px*/ @media (max-width: 1200px) {     .text-center-resizable {         font-size: 13px;         position: absolute;         left: 0;         right: 0;         margin: auto;         padding-top: 20px;         padding-bottom: 20px;         color: #ffffff;         text-align: center;         text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);     } }  @media (min-width: 1200px) {     .text-center-resizable {         font-size: 16px;         position: absolute;         left: 0;         right: 0;         margin: auto;         padding-top: 20px;         padding-bottom: 20px;         color: #ffffff;         text-align: center;         text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);     } } /* end of class */ #mycarousel {      background-color: #222;      background-attachment: fixed;      background-repeat: no-repeat;      -webkit-background-size: cover;      -moz-background-size: cover;      -o-background-size: cover;      background-size: cover;      padding: 0;  }

i resolved problem changing centered element, if needs in future leave code right down:

.

text-center-resizable {         color: #ffffff;         text-align: center;         margin: 0;         position: absolute;         top: 50%;         left: 50%;         transform: translate(-50%, -50%)     }

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