bug repair for plotly in javascript/php

I am using plotly to plot a graph to show the evolution of data in time. For some unknown reason, my graph slider doesn't work anymore and i can only show the data at the first date, and not the other dates, and this needs to be repaired. So when i choose another date with the glider, i should see the graph change shape (which was the case before but not anymore) to convert the data to javascript i did the following in php: <script> var listval = <?php echo json_encode($rows); ?>; </script>