c is null on using google charts

[Bluestacks Account]

Hi,

i would like to ask what is the problem on my script. I use a Web API to get the data and pass it thru using arrayToDataTable function to fill the data using php. When i try to view the page it always shows "c is null" but if you refresh it, it will show the graph.

Please help me with this problem.

Thanks..

[Daniel LaLiberte]

That kind of obscure error message indicates a bug on our side which we are interested in fixing, but you'll have to give us more clues so we can reproduce it.  

Can you put together a small example page using jsfiddle?  Or post enough code here.  We can't use your php code, so you should use the browser debugging tools to view the html and javascript source that is sent to the browser.

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[Bluestacks Account]

Hi Daniel,

this is part of the code which utilizes the Google Chart.

<?php
    foreach($symbols as $syms)
    {
        $ar_temp=array();
        $history=array();
        $start      =12;
        $length     =28;
        ?>
            <div data-role="page" id="<?=$syms."_chart";?>">
                <div data-role="header" data-position="fixed">
                <a href="#pageone" class="ui-btn ui-corner-none ui-icon-back ui-btn-icon-left">Back</a>
                <h1><?=$syms." Chart";?></h1>
                </div>
                <?php
                    $history_query = 'HISTORYNEW-symbol='.strtoupper($syms).'|period=30|from='.(time() - (1 * 24 * 60 * 60)).'|to='.(time());
                    $history_result = MQ_Query($history_query);
                    if ($history_result != '!!!CAN\'T CONNECT!!!' )
                    {
                        $s=substr($history_result,0,$start);
                        $ar_temp=unpack("ibars/idigits/itimesign",$s);
                        $digits=$ar_temp["digits"];
                        ?>
                        <script type="text/javascript" src="https://www.google.com/jsapi"></script>
                        <script type="text/javascript">
                            google.load("visualization","1",{packages:["corechart"]});
                            google.setOnLoadCallback(<?=$syms."Chart";?>)
                            function <?=$syms."Chart()";?>
                            {
                                <?php
                                $counter=0;
                                ?>
                                var data = google.visualization.arrayToDataTable([
                                <?php
                                $tmpstring="";
                                while($s=substr($history_result,$start,$length))
                                {
                                    $start+=$length;
                                    //$s = substr($history_result,$start,$length);
                                    $history=unpack("itime/iopen/ihigh/ilow/iclose/dvol",$s);
                                    $history["high"]+=$history["open"];
                                    $history["high"]/=pow(10,$digits);
                                    $history["low"]+=$history["open"];
                                    $history["low"]/=pow(10,$digits);
                                    $history["close"]+=$history["open"];
                                    $history["close"]/=pow(10,$digits);
                                    $history["open"]/=pow(10,$digits);
                                   
                                    $tmpstring.="['".date("d M Y",$history["time"])."',".$history["low"].",".$history["open"].",".$history["close"].",".$history["high"]."],";
                               
                                }
                                unset($arr_temp);
                                unset($history);
                                $data=mb_substr($tmpstring,0,-1);
                                ?>
                                <?=$data;?>],true);
                                var options={ legend:'none'};
                                var chart=new google.visualization.CandlestickChart(document.getElementById('<?=$syms."_div";?>'));
                                chart.draw(data,options);
                            }
                        </script>
                        <?php
                    }
                   
                ?>
                <div data-role="main" class="ui-content" id="<?=$syms."_div";?>" height="200px">
                </div>
            </div>
                <?php
    }
    unset($syms);
?>

Kindly check.

Thank you very much...

[Daniel LaLiberte]

As I said, we can't use your php code.   Could you go to your browser when you visit your page and open the debugger and view the html for the page?  Maybe if you look at the generated code, you'll see what the problem is.

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[Bluestacks Account]

Hi Daniel,

It seems the other error was gone but the error "Cannot read property 'length' of null"occur.

[Bluestacks Account]

and when i run it on debugger, there is no error there and the data are on the page the only problem is that the chart is not showing.