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Using:
WKpdftohml version 0.12.3.2
PHPwkhtmltopdf version 2.2.0
Chart.JS version 2.5.0
I'm trying to print a line graph using the above libraries. I can reproduce a pdf using the shell command: wkhtmltopdf --javascript-delay 5000 " http://netdna.webdesignerdepot.com/uploads7/easily-create-stunning-animated-charts-with-chart-js/chartjs-demo.html" test2.pdf
So there is no problem with WKhtmltopdf.
The problem is when I do it in my app, using the PHPwkhtmltopdf library. I get a blank page.
From my research these are the things I tried:
'javascript-delay' => 500 to Chart.JS options;animation:{onComplete: function () {window.JSREPORT_READY_TO_START =true} to Chart.JS options;<div style="width:800px;height:200;font-size:10px;"> to the parent div of canvas html tagctx.canvas.width = 800;ctx.canvas.height = 200; to javascript initialization of the chart.Well nothing worked. I love Chart.JS and WKhtmltopdf, but if I cant print I'll have to drop one of them. Is there any solution?
This is my php code for the PHPwkhtmltopdf:
public function imprimir ($request, $response)
{
// include_once 'config/constants.php';
// include_once 'resources/auxiliar/helpers.php';
$folha = $_POST['printit'];
$variaveis = explode(',', $folha);
$nomeFicheiro = $variaveis[0];
$printName = substr($nomeFicheiro, 5);
if (isset($variaveis[2])) {
$_SESSION['mesNumero'] = $variaveis[2];
$_SESSION['mes'] = $variaveis[1];
} else {
$mesNumero = 0;
$mes = '';
}
ob_start();
if ($nomeFicheiro == 'printPpiam') {
require ('C:/xampp/htdocs/.../'.$nomeFicheiro.'.php');
} else {
require ('C:/xampp/htdocs/.../'.$nomeFicheiro.'.php');
}
$content = ob_get_clean();
// You can pass a filename, a HTML string, an URL or an options array to the constructor
$pdf = new Pdf($content);
// On some systems you may have to set the path to the wkhtmltopdf executable
$pdf->binary = 'C:/Program Files/wkhtmltopdf/bin/wkhtmltopdf';
$pdf -> setOptions(['orientation' => 'Landscape',
'javascript-delay' => 500,
// 'enable-javascript' => true,
// 'no-stop-slow-scripts' => true]
]);
if (!$pdf->send($printName.'.pdf')) {
throw new Exception('Could not create PDF: '.$pdf->getError());
}
$pdf->send($printName.'.pdf');
}
# Update 1
Made a php file with the page output. Run it in the browser and the graph rendered. When I do it in the console it renders everything except the graph!
How can it be wkhtmltopdf renders the graphics in this page : http://netdna.webdesignerdepot.com/uploads7/easily-create-stunning-animated-charts-with-chart-js/chartjs-demo.html but not my own?!
550
Here's the code that works with wkhtmltopdf version 0.12.5:
chart.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script>
<style>
.reportGraph {width:900px}
</style>
</head>
<body>
<div class="reportGraph"><canvas id="canvas"></canvas></div>
<script type="text/javascript">
// wkhtmltopdf 0.12.5 crash fix.
// https://github.com/wkhtmltopdf/wkhtmltopdf/issues/3242#issuecomment-518099192
'use strict';
(function(setLineDash) {
CanvasRenderingContext2D.prototype.setLineDash = function() {
if(!arguments[0].length){
arguments[0] = [1,0];
}
// Now, call the original method
return setLineDash.apply(this, arguments);
};
})(CanvasRenderingContext2D.prototype.setLineDash);
Function.prototype.bind = Function.prototype.bind || function (thisp) {
var fn = this;
return function () {
return fn.apply(thisp, arguments);
};
};
function drawGraphs() {
new Chart(
document.getElementById("canvas"), {
"responsive": false,
"type":"line",
"data":{"labels":["January","February","March","April","May","June","July"],"datasets":[{"label":"My First Dataset","data":[65,59,80,81,56,55,40],"fill":false,"borderColor":"rgb(75, 192, 192)","lineTension":0.1}]},
"options":{}
}
);
}
window.onload = function() {
drawGraphs();
};
</script>
</body>
</html>
Run:
$ wkhtmltopdf chart.html chart.pdf:
Loading pages (1/6)
Counting pages (2/6)
Resolving links (4/6)
Loading headers and footers (5/6)
Printing pages (6/6)
Done
Found the answer. After I created a separate file, outside the framework, i did some tests again. It rendered the graph in the browser so I tried to use the command tool WKhtmltopdf, and it did not worked, when it did with other examples (see Update #1). So there is something wrong with my php page.
Ran the same tests that I did in the framework, and got the answer for my problem. By introducing a parent div tag width dimensions in the canvas tag it made the graph render in the page.
<div style="width:800px;height:200;">
<canvas id="myChart" style="width:800px;height:200;"></canvas>
</div>
The proposition was found in this site: Github, so thanks laguiz.
15
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