I am generating a chart using the Google Charts API and the data from my database, which means that there is a call to an external file and data is echoed back in a JSON format. I know that the chart can be converted to an image so I thought that this might work but unfortunately not I have tried the code below:
google.load("visualization", "1", {packages:["corechart"]});
google.setOnLoadCallback(drawChart);
function drawChart() {
var jsonData = $.ajax({
url: "getData.php?id=<?php echo $user_id; ?>';",
dataType:"json",
async: false
}).responseText;
var data = new google.visualization.DataTable(jsonData);
var options = {
hAxis: {
title: 'Audit Number'
},
vAxis: {
title: 'Gross Profit %'
}
};
var chart_div = document.getElementById('chart_div');
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
google.visualization.events.addListener(chart, 'ready', function () {
var imgUri = chart.getImageURI();
// do something with the image URI, like:
document.getElementById('chartImg').src = imgUri;
});
chart.draw(data, options);
}
I then call include the graph on the PDF report by
$rep_table = " <html><img id='chartImg' />
When I load the page in HTML view, it displays the chart but it's still interactive so the first issue is definitely something to do with the conversion of the chart.
The code for generating the report can be seen below
$total = db::c()->query("
SELECT sum(value) FROM stocktake_allowances WHERE stocktake_id = '{$stocktake_id}' AND customer_id = '".$user_id."';")->fetchColumn(0);
$dep_qry = "SELECT
category_name AS category_name,allowance_date AS date, SUM(value) AS total_cost
FROM stocktake_allowances
";
$dep_qry .= " WHERE stocktake_id = '{$stocktake_id}' AND customer_id = '".$user_id."'
";
$dep_qry .= "
GROUP BY TRIM(UPPER(category_name))
ORDER BY category_name, allowance_date ASC";
//echo $dep_qry;
$dep_res = db::c()->query($dep_qry);
$rep_table .= " <html><img id='chartImg' /><img id='chart_div' /><br/><br/><link rel='stylesheet' href='./index/style.css' type='text/css'> <table class='st_det_rep' >
<tr>
<td style='width:80%; text-align:center; font-size:30px;'>
<img src='index/EasyCountio.png' alt='EasyCount.io' height='61' width='280'/><br/><br/><br/><br/>
<strong>Wastage Summary</strong><br/>
</td>
</tr>
</table>";
$rep_table .= "
<table id='stock_detail_report' cellspacing='0' style='margin-top:10px;'>
<tr>
<td class='top' style='width:30%;'><div class='nosplit'>Wastage Category</div></td>
<td class='top' style='width:15%;'><div class='nosplit'>Ref. No.</div></td>
<td class='top' style='width:15%;'><div class='nosplit'>Value</div></td>
</tr>";
$sum_total_cost = 0;
$sum_total_retail = 0;
$sum_total_qty = 0;
$counter = 1;
$j=0;
while ($row = $dep_res->fetch(PDO::FETCH_ASSOC))
{
$total_cost = $row['total_cost'];//$row['unit_cost_price']*$row['qty'];
$catName = $row['category_name'];
$sum_total_cost += $total_cost;
$date = date("d-M-y", strtotime($row['date']));
$tc = number_format($total_cost, 2);
if(!($j%2)) {
$cssClass = 'odd';
} else {
$cssClass = 'even';
}
$j++;
$rep_table .= "<tr>
<td style='text-align:right;'><div class='nosplit'>".$catName."</div></td>
<td style='text-align:right;'><div class='nosplit'>".$counter."</div></td>
<td style='text-align:right;'><div class='nosplit'>€".$total_cost."</div></td>
</tr>";
$counter++;
}
$stc = number_format($sum_total_cost, 2);
$rep_table .= "<tr>
<td class='bottom' colspan = '2'><div class='nosplit'>Total Wastage:</div></td>
<td class='bottom'><div class='nosplit'>€".$stc."</div></td>
</tr>
</table>";
$dompdf = new Dompdf();
$dompdf->loadHtml($rep_table);
// // (Optional) Setup the paper size and orientation
$dompdf->setPaper('A4', 'l');
// // Render the HTML as PDF
$dompdf->render();
// // Output the generated PDF to Browser
$dompdf->stream("Allowances Summary.pdf", array("Attachment" => false));
The bigger issue is with including the graph on the report. When I try to generate the PDF report I get an error saying that the headers have already been sent. I used one of the tips on SO to find out what the problem is and this is what I got back:
/home/arturl/public_html/platform/class/class_report.php
21
Which corresponds to
url: "getData.php?id=<?php echo $user_id; ?>';",
This makes perfect sense as the json string is echoed back and DOMPDF sees it as a header. Is there any other way to get this done?
