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.
What is the best way to implement a loading screen in Ember 2.5? What I want to achieve is: show splash screen -> load data in background -> when DOM is ready, hide splash screen.
I tried several options, but I cannot achieve to hide the splash screen when the document is ready. I am loading a large table, so it will take some time to finish the DOM, so model-ready is not the right hook.
I did this by adding custom HTML (simple loading div) to the app/index.html:
<body>
<div class="loading-overlay" id="initialLoading"></div>
{{content-for "body"}}
<script src="assets/vendor.js"></script>
<script src="assets/event.js"></script>
{{content-for "body-footer"}}
</body>
Then I added the following to my app/application/route.js:
actions: {
loading(transition/* , originRoute*/) {
let controller = this.get('controller');
if(controller) {
controller.set('currentlyLoading', true);
}
transition.promise.finally(function() {
$("#initialLoading").remove();
if(controller) {
controller.set('currentlyLoading', false);
}
});
}
}
In my app/application/template.hbs I also had to add the loading div:
{{#if currentlyLoading}}
<div class="loading-overlay"></div>
{{/if}}
So what does happen?
index.html is loaded and no javascript is parsed yet: your loading screen is visible.
index.html is loaded and your javascript has been parsed. ember.js calls the loading action and sets currentlyLoading to true: both loading screens are shown.
the transition is complete, the first loading and second loading screen get removed
for every transition that is now happening, the loading screen is shown. To remove this behaviour, remove the second loading screen logic.
I hope it helps.
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 () {
$(this.container).closest('.fullbleed-video-module').find('.video-placeholder-text').show();
});
}
</script>
There is also another issue with your code - Guid can start with number, and this is not a valid id for html elements. You should change your code to:
var vidid = "jwp-" + Guid.NewGuid().ToString();
I wouldn't rule out a conflict with the version of JQuery that the Page Editor uses - this usually messes stuff up. There's a good post here on to overcome the issues.
http://jrodsmitty.github.io/blog/2014/11/12/resolving-jquery-conflicts-in-page-editor/
Why does the template get rendered the number of times that correlates with the Each in my template.
<template name="carousel">
<div class="pikachoose">
<ul class="carousel" >
{{#each article}}
<li><img src="{{image}}" width="500" height="250" alt="picture"/><span>{{caption}}</span></li>
{{/each}}
</ul>
</div>
</template>
Template.carousel.article = function () {
return News.find({},{limit: 3});
}
Template.carousel.rendered = function() {
//$(".pika-stage").remove();
alert($(".carousel").html());
//$(".carousel").PikaChoose({animationFinished: updateNewsPreview});
}
In this case it would alert 3 times.
That's the way Meteor handles data updates. Your article data function returns a cursor that is to be used in the template. Initially, the cursor is empty, and data is pulled from the server, one article at a time. Each time an article is fetched, the contents of cursor are changed (it now has one more article), and therefore the reactive article method causes template to rerender.
If you need to be sure that your code runs only once, there are several possibilities depending on what you need.
The easiest one is just to use created instead of rendered.
If you modify DOM elements, you can also mark elements you modify so that you won't process them twice:
Template.carousel.rendered = function() {
_.each(this.findAll('.class'), function(element){
if($(element).data('modified')) return;
$(element).data('modified', true);
...
});
};
You can disable reactivity for the cursor, though it's a sad solution:
Articles.find(..., {reactive: false});
The most invasive, but also the most versatile is to observe when the data is fully loaded:
Deps.autorun(function() {
Meteor.subscribe('articles', {
ready: function() {
...
},
});
});
The issue may have to do with the use of the .rendered callback. Each time the loop runs the DOM is updated so the callback will run again.
When I had this problem in the past, I found it helpful to use Meteor event handlers whenever possible, to eliminate load order issues like this one. In this case, maybe you could try a timeout, so that that the .remove() and .PikaChoose() calls only run after the DOM has been quiet for a certain interval. Hope that works for you.
I am using Apex 4.0.2. My goal is to have my success message flash at the top after I succesfully fill out a form. I have a javascript function:
<script type="text/javascript">
{var i = 1,timer;
window.onload=function() {
timer = setInterval('flash()', 500);
}
function flash() {
if (i<10000) {
if (i%2 == 0) {
document.getElementById('flash').style.backgroundColor = '#ffffff';
} else {
document.getElementById('flash').style.backgroundColor = '#ffff00';
}
} else {
document.getElementById('flash').style.backgroundColor = '#ffffff';
clearInterval(timer);
}
i++;
}
</script>
I placed this code originally on the javascript tab of the page that the form branches to. Later I moved it to the process success message along with the call to the function
<center>
<table id="flash" BORDER=0 >
<tr>
<td>Success!</td>
</tr>
</table>
</center>
I receive an error from the page on Firebug:
document.getElementById("flash") is null
document.getElementById('flash').style.backgroundColor = '#ffff00';
Internet Explorer tells me :
Message: Object required
I think my problem is that the success message region object does not always exist. Is there any way to execute the function only when I make that call to display the success message?
In advance,
Thanks so much for your help!
The javascript region has its uses, but i'd recommend using dynamic actions since they provide a much clearer overview of what takes place on your page.
Edit your page header (page, edit), or add to your css:
<style>
.flash1{
background-color: blue;
}
.flash2{
background-color: yellow;
}
</style>
Create a new dynamic action:
Event: Page Load, Condition: none
As true action, select 'Execute Javascript Code' as action.
Use jQuery to fetch objects and toggle between classes. It's cleaner
since you don't mix in css/style in javascript.
var $smsg = $(".uMessageText"), flash;
$smsg.addClass('flash1');
if($smsg.length){
flash = setInterval(function(){
$smsg.toggleClass('flash1');
$smsg.toggleClass('flash2');
}, 1000);
setTimeout(function(){
clearInterval(flash);
}, 10001);
};
This will change the class on the success message each second for 10
seconds. The interval is cleared after those 10 seconds. No
interval will be started if the success message has not been found
since the jQuery object will be empty (length=0).
var $smsg = $(".uMessageText")
This is the selector for your success message element, and this
example is the selector for that element in Theme 23. Be aware that
the success message id or class depends on your chosen theme and
page template, and you'll most likely need to change it. Of
course, the selector can be any element you'd like.
If you're not familiar with jQuery, i'd advise you to take a look at it. It is included in apex by default (and apex relies on it), and is a very powerful tool when javascripting. http://jquery.com/
In short though: select element by id: $("#id_attribute_here"), select by class $(".class_name_here")