Hi,

$render_page = new PageView(array(
    "data_e"=>$details_report,
));
$render_page-> run()->render();

childReport file-

 protected function defaultParamValues()
    {   
	    return array(
		
		"dateRange_page"=>array(
			'2017-05-09' , '2018-09-30'
		      ),
            );
    }

    protected function bindParamsToInputs()
    {
        return array(
		"dateRange_page"=>"dateRange_page", 
		
        );
    }
  function setup()
    {  
	    
 $this->src("database")->query("SELECT STR_TO_DATE(page_visit_date,'%Y-%m-%d') AS DATE, page_visit FROM event_page_visits WHERE event_id = '6672'
AND DATE(page_visit_date) BETWEEN :start AND :end GROUP BY DAY(page_visit_date) ;")
       
		
        ->params(array(
		    ":start"=>$this->params["dateRange_page"][0],
            ":end"=>$this->params["dateRange_page"][1],
        
        ))->pipe($this->dataStore("report_pageevent"));
}

childReport.vew ---

<div class="form-group date_div" style="text-align:center;">
                        <?php
                        DateRangePicker::create(array(
                            "name"=>"dateRange_page",
						 ))
                        ?>
                        </div>

			<?php
if(isset($this->params["dateRange_page"]) && $this->params["dateRange_page"]!=null)
{
	
?>
    <div class="form-group ">
        <button onclick="pageView_kool()" class="btn btn-success">View</button>
    </div>
<?php    
}

 ?>

<script type="text/javascript">
    function pageView_kool()
    { subReport.update("EventPageViewSub",{
            "dateRange_page":$('#dateRange_page').val(),
          });
    }
</script>

when I submit button its give Disallowed Key Charac error ....