gistfile1.js

var a = [];
for (var i in localStorage){
  if (localStorage.propertyIsEnumerable(i) && i.indexOf('dataset_')===0){
    a.push( i.split('_')[1] );
  }
}

$('#container').load([location.path, a.join('|')].join('/'));

gistfile2.php

<?php

function filter(){
  if ($this->param('id')){
    $ids = str_replace('|', ' OR ', $this->param('id'));
    $this->query()->addFilterQuery("entity_id:($ids)");
  }
}