javascript - Loading effect on google chart refresh -

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i have page multiple google charts. have drop-down @ page level. refresh/ reload charts when user changes values drop-down.

everything working fine there few seconds delay between value selection , charts update. want show loading effect overlay , image on page before charts refreshed.

the problem unable overlay effect on top of google charts. loading effect javascript trigger , background gets greyed, loading image hidden behind charts.

jsfiddle problem: https://jsfiddle.net/0tj1pzsk/14/

how can overlay spinner image on top of google charts? placing spinner image inside chart div display first chart load , not subsequent refreshes

code:

css

#loading-img {   background: url(https://i1.wp.com/cdnjs.cloudflare.com/ajax/libs/galleriffic/2.0.1/css/loader.gif) center center no-repeat;   height: 100%;   z-index: 20; }  .loading {   background: #a3a3a3;   display: none;   position: absolute;   top: 0;   right: 0;   bottom: 0;   left: 0;   opacity: 0.5; }  javascript  $('#test').click( function() {   $('.loading').show();  });  google.charts.load("current", {packages:['corechart']}); google.charts.setonloadcallback(drawchart); function drawchart() {   var data = new google.visualization.arraytodatatable([     ['threat', 'attacks'],     ['chandrian', 38],     ['ghosts', 12],     ['ghouls', 6],     ['ufos', 44],     ['vampires', 28],     ['zombies', 88]   ]);    var options = {     legend: 'none',     colors: ['#760946'],     vaxis: { gridlines: { count: 4 } }   };    var chart = new google.visualization.linechart(document.getelementbyid('line-chart'));   chart.draw(data, options); };   html   <button id="test">test</button>  <div class="loading"><div id="loading-img"></div></div>  <div id="line-chart"></div>

try moving css...

z-index: 20;

from...

#loading-img

to...

.loading

see following example...

$('#test').click( function() {   $('.loading').show();   });        google.charts.load("current", {packages:['corechart']});      google.charts.setonloadcallback(drawchart);      function drawchart() {        var data = new google.visualization.arraytodatatable([          ['threat', 'attacks'],          ['chandrian', 38],          ['ghosts', 12],          ['ghouls', 6],          ['ufos', 44],          ['vampires', 28],          ['zombies', 88]        ]);          var options = {          legend: 'none',          colors: ['#760946'],          vaxis: { gridlines: { count: 4 } }        };          var chart = new google.visualization.linechart(document.getelementbyid('line-chart'));        chart.draw(data, options);      };  	  	   
#loading-img {      background: url(https://i1.wp.com/cdnjs.cloudflare.com/ajax/libs/galleriffic/2.0.1/css/loader.gif) center center no-repeat;      height: 100%;    }    .loading {      background: #a3a3a3;      display: none;      position: absolute;      top: 0;      right: 0;      bottom: 0;      left: 0;      opacity: 0.5;      z-index: 20;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <script src="https://www.gstatic.com/charts/loader.js"></script>  <button id="test">test</button>  	  <div class="loading"><div id="loading-img"></div></div>     <div id="line-chart"></div>


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