Wkhtmltopdf does not render Chart.JS 2.5.0 graph - chart.js

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:
Added 'javascript-delay' => 500 to Chart.JS options;
Added animation:{onComplete: function () {window.JSREPORT_READY_TO_START =true} to Chart.JS options;
Added <div style="width:800px;height:200;font-size:10px;"> to the parent div of canvas html tag
Added ctx.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 can't 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?!
# Update 2
After Quince's comment, I tried just turning the animations off, but I'm not sure on how to do that. I tried:
$pdf -> setOptions(['orientation' => 'Landscape',
'javascript-delay' => 500,
// 'window-status' => 'myrandomstring ',
'animation' => false,
'debug-javascript',
'no-stop-slow-scripts',
]);
But it fails.

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.

Try adding this, as according to this github source
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/7.0.0/polyfill.min.js"></script>

Solved it by downgrading wkhtmltopdf: 0.12.4 > 0.12.2.1
chart.js version seemed to have no influence. I used 2.7.0.
Fixed width and height seem to be required as well.
Edit: Since wkhtmltopdf is dead, I switched to Puppeteer recently.

I was dealing with the same issue using rotativa to export my ASP.NET MVC page with Chart.JS to PDF with no luck.
After a couple of days I finally found a super-easy solution to achieve my goal. What I did is simply to use the .toBase64Image() method of Chart.JS to encode the chart to a base64 string variable in Javascript. Then I saved this string into a model and then on the PDF html page a used tag where i put the base64encoded string to a scr property and the result is great :-)
javascript:
//save Chart as Image
var url_base64 = document.getElementById('myChart').toDataURL('image/png');
//set the string as a value of a hidden element
document.getElementById('base64graph').value = url_base64;
PDF view:
<img style='display:block; width:900px;height:400px;position:relative;margin:auto;text-align:center;' id='base64image'
src='#Model.base64graph' />

I'm trying to improve on the answer by temuri, which is great, but a bit bloated. I ran into the OP's issues (even same WKpdftohml version) and this did the trick for me:
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script>
<div style="width: 400px;"><canvas id="canvas"></canvas></div>
<script type="application/javascript">
// wkhtmltopdf 0.12.5 crash fix.
// https://github.com/wkhtmltopdf/wkhtmltopdf/issues/3242#issuecomment-518099192
Function.prototype.bind = Function.prototype.bind || function (thisp) {
const fn = this;
return function () {
return fn.apply(thisp, arguments);
};
};
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":{}
}
);
</script>
I'm yet to figure out how to get the chart library via ordinary tools like npm, instead of getting it via ajax like here in the first line. Note that this can impact your chart resolution.

I was strugling with that too and you self-answer did not help my case. I am using symfony 3.3 and Chart.js 2 and whatever I did, did not work properly. So I have solved it in a different manner (maybe not a clean one) and I wanted to post it here for inspiration to others.
I needed to export a page, that I was presenting to the user in a browser. In browser, I used Javascript to get picture out of the rendered graph with
animation: {
onComplete: function(animation) {
console.log('done');
var url=document.getElementById("barChartByCountryWeight{{ part }}{{ subsetKey }}").toDataURL();
$.ajax({
url: 'saveChartImages',
type: 'POST',
data: { 'barChartByCountryWeight{{ part }}{{ subsetKey }}': url },
success: function(result) {
console.log(result);
console.log('the request was successfully sent to the server');
},
error: function (request, error) {
console.log(arguments[0]['responseText']);
console.log(" Can't do because: " + error);
}
});
}
}
And on server side I put it in session and in a controller for the PDF export, I have taken the image from session and put the image in the HTML, that is converted to PDF.
Hope that helps.

I have implemented the working code for this issue. You can check out the working code here.
NOTE: For generating pdf you must disable the Chart JS animation or add the option javascript-delay=>1000 to the wkhtmltopdf options.

I have solved this problem when I tried to use Chartjs 1 instead of a new chart js. The reason for this is because laravel snappy uses wkhtmltopdf, which doesn't support css animation, while new chartjs uses css animation.
This github issue shows that.
The solution i found is to use google chart instead. It also uses svg, so you can get high resolution charts.

Related

Populating a Google Charts Dashboard with an external Google Sheet

I just got finished implementing the solution from this question on a similar topic, but the solution is not working for me.
I'm trying to create a dashboard that uses data from a google spreadsheet but I can't seem to get it to load correctly.
I routinely get the following error message whenever I load the web page:
One or more participants failed to draw()
Here's the code I'm using right now:
<html>
<head>
<script type="text/javascript">
// Load the Visualization API and the controls package.
google.charts.load('current', {'packages':['corechart', 'controls']});
// Set a callback to run when the Google Visualization API is loaded.
google.charts.setOnLoadCallback(initialize);
function initialize() {
var query = new google.visualization.Query('https://docs.google.com/spreadsheets/d/1FnETUo8yrthFBdUYsQ8Ty9e8pK3ouWZntvDnXlhHKws/edit#gid=0');
query.send(drawDashboard)
}
// Callback that creates and populates a data table,
// instantiates a dashboard, a range slider and a pie chart,
// passes in the data and draws it.
function drawDashboard(response) {
// Create our data table.
var data = response.getDataTable();
// Create a dashboard.
var dashboard = new google.visualization.Dashboard(
document.getElementById('dashboard_div'));
// Create a range slider, passing some options
var donutRangeSlider = new google.visualization.ControlWrapper({
'controlType': 'NumberRangeFilter',
'containerId': 'filter_div',
'options': {
'filterColumnLabel': 'Donuts eaten'
}
});
// Create a pie chart, passing some options
var pieChart = new google.visualization.ChartWrapper({
'chartType': 'PieChart',
'containerId': 'chart_div',
'options': {
'width': 300,
'height': 300,
'pieSliceText': 'value',
'legend': 'right'
}
});
// Establish dependencies, declaring that 'filter' drives 'pieChart',
// so that the pie chart will only display entries that are let through
// given the chosen slider range.
dashboard.bind(donutRangeSlider, pieChart);
// Draw the dashboard.
dashboard.draw(data);
}
</script>
</head>
<body>
<div id="dashboard_div">
<!--Divs that will hold each control and chart-->
<div id="filter_div"></div>
<div id="chart_div"></div>
</div>
</body>
</html>
Link to the spreadsheet can be seen here: https://docs.google.com/spreadsheets/d/1FnETUo8yrthFBdUYsQ8Ty9e8pK3ouWZntvDnXlhHKws/edit#gid=420659822
The dashboard I'm trying to draw is taken directly from the source documentation listed here: https://developers.google.com/chart/interactive/docs/gallery/controls
I'm trying to follow the example about loading external spreadsheets here: https://developers.google.com/chart/interactive/docs/spreadsheets
The link to the working file I'm using for this project can be seen here: https://s3-us-west-2.amazonaws.com/example-server/index.html
I've tried removing all header links and styling in the previous link to verify nothing else was interfering with the visualization API and this did not solve the problem either.
Also:
Privacy for the spreadsheet is set to 'Public on the web'
The link being used in the query is taken directly from the address bar, but I also used the 'sharing link' provided by google when you prompt for it.
I'm using data that's exactly the same as the examples in the google documentation to make implementation as easily as possible.
Edit
Due to an answerer's prompt, I experiemented with different modifications of my query URL, which so far have not worked.
Here's the URL in my address bar:
URL
It's a single sheet document.
In response to the first answer, I've tried the following query URL's, but without success.
First:
https://docs.google.com/spreadsheets/d/1FnETUo8yrthFBdUYsQ8Ty9e8pK3ouWZntvDnXlhHKws/gviz/tq?sheet=Sheet1
Second:
https://docs.google.com/spreadsheets/d/1FnETUo8yrthFBdUYsQ8Ty9e8pK3ouWZntvDnXlhHKws/gviz/tq?gid=0
Third:
https://docs.google.com/spreadsheets/d/1FnETUo8yrthFBdUYsQ8Ty9e8pK3ouWZntvDnXlhHKws/gviz/tq?gid=1FnETUo8yrthFBdUYsQ8Ty9e8pK3ouWZntvDnXlhHKws
The idea behind this last URL is that in the new google sheets the gid is the string after d/ and before /edit.
Your help is greatly appreciated.
Find your dataSourceURL at:
var query = new google.visualization.Query('https://docs.google.com/spreadsheets/d/1FnETUo8yrthFBdUYsQ8Ty9e8pK3ouWZntvDnXlhHKws/edit#gid=0');
Replace:
edit#gid=0
with:
gviz/tq?sheet=Sheet1
If that doesn't work, then you'll need to use the gid which is a unique 9 to 10 digit number. (ex. gid=1104711743). Open your sheet and look at the address bar, you should see it at the end of the url.
Your line should look like this:
var query = new google.visualization.Query('https://docs.google.com/spreadsheets/d/1FnETUo8yrthFBdUYsQ8Ty9e8pK3ouWZntvDnXlhHKws/gviz/tq?gid=1234567890');

jwPlayer causes rendering not to load in Sitecore's Page Editor

I'm currently working on a rendering in Sitecore 7.2 (MVC) that will show a jwPlayer given a link to a video (either in the Media Library or from an external source, like YouTube). When I add the rendering (with a valid data source) through Presentation Details in the Content Editor everything looks fine, and works perfectly. The trouble that I'm running into right now, though, is that when I try to do the same thing from the Page Editor (with the exact same rendering and data source), nothing is showing up in that placeholder at all.
The part of the rendering that deals with the video is as follows:
#if (Model.VideoLink != null && Model.Image != null)
{
var vidid = Guid.NewGuid().ToString();
<div class="article-video-module">
<p class="video-placeholder-text">#Html.Raw(Model.Heading)</p>
<div id="#vidid">Loading the player...</div>
<script type="text/javascript">
jwplayer("#vidid").setup({
file: "#Model.VideoLink.Url",
image: "#Model.Image.Src",
width: "100%",
aspectratio: "16:9",
sharing: {
link: "#Model.VideoLink.Url"
},
primary: 'flash'
});
jwplayer('videodiv-#vidid').onPlay(function () {
$(this.container).closest('.fullbleed-video-module').find('.video-placeholder-text').hide();
});
jwplayer('videodiv-#vidid').onPause(function () {
$(this.container).closest('.fullbleed-video-module').find('.video-placeholder-text').show();
});
</script>
</div>
#Editable(a => Model.Description)
}
Other things that might help:
When I comment out everything in the <script> tag above the rendering shows up perfectly.
A reference to jwplayer.js is found on the page (that was my first thought)
Console errors in Javascript:
No suitable players found and fallback enabled on jwplayer.js
Uncaught TypeError: undefined is not a function on jwplayer("#vidid").setup({ and on jwplayer('videodiv-#vidid').onPlay(function () { from above.
How can I get jwPlayer and Page Editor to work nicely with each other?
The issue is that when you add a component through Page Editor, the script is fired before the div <div id="#vidid"> element is added to DOM. Don't ask me why...
The solution is really simple: wrap your javascript code with if condition, checking if the div is already there:
<script type="text/javascript">
if (document.getElementById("#vidid")) {
jwplayer("#vidid").setup({
file: "#Model.VideoLink.Url",
image: "#Model.Image.Src",
width: "100%",
aspectratio: "16:9",
sharing: {
link: "#Model.VideoLink.Url"
},
primary: 'flash'
});
jwplayer('videodiv-#vidid').onPlay(function () {
$(this.container).closest('.fullbleed-video-module').find('.video-placeholder-text').hide();
});
jwplayer('videodiv-#vidid').onPause(function () {
$(this.container).closest('.fullbleed-video-module').find('.video-placeholder-text').show();
});
}
</script>
There is also another issue with your code - Guid can start with number, and this is not a valid id for html elements. You should change your code to:
var vidid = "jwp-" + Guid.NewGuid().ToString();
I wouldn't rule out a conflict with the version of JQuery that the Page Editor uses - this usually messes stuff up. There's a good post here on to overcome the issues.
http://jrodsmitty.github.io/blog/2014/11/12/resolving-jquery-conflicts-in-page-editor/

using a famo.us surface to link to another URL

Seems like this should be obvious but...How can you use a famo.us surface as a link to another webpage?
I've tried:
this.fooSurface.on("click", function(){
window.location.replace("www.foo.com");
});
but this doesn't replace the URL, it just puts the new URL on the end of the address currently in the URL bar. window.location.href = "www.foo.com" has the same result.
EDIT: window.location.assign("www.foo.com") and window.location = ("foo") also have the same result. I think this has something to do with this script in the boilerplate index.html:
<script type="text/javascript">
require.config({baseUrl: 'src/'});
require(['main']);
</script>
Use window.location.assign("http://www.foo.com"); instead.
I probably wouldn't use the replace() method personally, as replace() switches the current page's place in the document history with that of the one you provide to the method, which I can't say I've ever found beneficial as a user unless there's a blank intermediary login page or something very specific (and temporary).
Or you can even just use window.location = "http://www.foo.com";
https://developer.mozilla.org/en-US/docs/Web/API/Window.location
I was able to get things working just fine with the boilerplate generator-famous gives you.
The script tag has nothing to do with it. That's configuration for RequireJS to load in the famo.us library with AMD.
var logo = new ImageSurface({
size: [200, 200],
content: '/content/images/famous_logo.png',
classes: ['backfaceVisibility']
});
logo.on('click', function() {
window.location.href ='http://www.google.com';
});
This problem you're having is also not a famo.us problem. It's your Javascript...

Remember preferable language

I've made a simple website for my daughter.
It is in Dutch and for every page there is a English version as well.
Dutch URL: nl/index.html
English URL: eng/index.html
What I would like to do is give the visitor the option to set one language as preference. So if they come to this site the next time they will automatically linked to the preferable page.
I know this can be done with a cookie and saw the explanation on this forum ( How to remember the currently clicked url? javascript?PHP? ).
I've tried to make this work but apparently I am doing something wrong?
Can somebody guide me through step by step? That would be great!
Kind regards,
Jurgen
If you are familiar with jQuery you can use the cookies plug-in to persist the user's language choice and redirect him to the appropriate page every time he comes back to your site. Bellow is a sample code that uses two buttons to set the language:
First you declare the jQuery scripts (I use to store them in a Script folder, hence the following):
<script type="text/javascript" src="../Script/jquery-1.7.2.js"></script>
<script type="text/javascript" src="../Script/jquery.cookie.js"></script>
Then you define the page ready event like this:
$(function () {
var url = 'your_url';
var english_page = 'eng/index.html';
var dutch_page = 'nl/index.html';
if ($.cookie('default_page') != null) {
if (window.location.href != url + '/' + $.cookie('default_page')) {
window.location.href = url + '/' + $.cookie('default_page');
}
}
$('#set_english_butt').click(function () {
$.cookie('default_page', english_page, { expires: 999 });
alert('English was set as the default language');
});
$('#set_dutch_butt').click(function () {
$.cookie('default_page', dutch_page, { expires: 999 });
alert('Dutch was set as the default language');
});
});
Which is hooked to some html buttons in you page:
<div>
<span>Select your language:</span>
<button id="set_english_butt">English</button>
<button id="set_dutch_butt">Dutch</button>
</div>

Automatically Embed Youtube Videos From URI

How would you go about embedding youtube vidoes automatically from the URI.
Say for example you type in a textbox:
The quick brown fox jumped over this video http://www.youtube.com/watch?v=5qm8PH4xAss&feature=player_embedded and then fell into this http://www.youtube.com/watch?v=lSCSmpV8Nn8&feature=hp_SLN&list=SL
You press submit and the results are displayed back to you. In place of the youtube links you have the actual flash files.
(In php naturally, or any language).
I know you could use Regex (preg_replace .etc), however how would you remove the extra queries that youtube provides (i.e. &feature=blah), and turn everything into something like: http://www.youtube.com/v/5qm8PH4xAss, ready to be placed into an object to embed.
Sorry for the long question,.. I hope you understand it. :)
i think you are looking for something like this:
try it here : http://www.jsfiddle.net/feridcelik/qu6U6/2/
<script src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<script src="http://jquery.lukelutman.com/plugins/flash/jquery.flash.js"></script>
<script type="text/javascript">
var yt="http://www.youtube.com/v/";
$("a[href^='http://www.youtube.com/watch?v=']").each(function(){
var key;
var href =$(this).attr("href");
var i=href.indexOf("v");
href=href.substring(i+2,href.length);
i=href.indexOf("&");
if(i>-1){
key=href.substring(0,i);
}
href=yt+key;
$(this).after("<a href='"+href+"' class='video'></a>");
});
$('.video').flash(
{ height: 200, width: 200},
{ version: 8 },
function(htmlOptions) {
$this = $(this);
htmlOptions.src = $this.attr('href');
$this.before($.fn.flash.transform(htmlOptions));
}
);
$('.video').remove();
</script>
based on the flash plugin from:
http://jquery.lukelutman.com/plugins/flash/