testing chartjs
Update: 30 June 2020 I checked this code, and it was broken all fixed now. The issue with the demo included on the main site is that it was trying to run the chart js before the chart library was loaded. you have to create the chart when the document is ready to fix this. The window onload does not work either. has to be a document ready. You can use the plain javascript version of this or the jquery if you want to rely on that.
Seeing how easy it is too add some chart.js charts using the getting started documentation.
Install via CDN here. Hmm.. do i need the bundle and the normal one? I guess i do?
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.bundle.min.js"></script>
I think you only need to add one of the chart js's one of them comes bundled with moment js something to do with the chart labels.
add the chart
using the provided demo was giving me the error:
(index):244 Uncaught TypeError: Cannot read property 'getContext' of null
at (index):244
this was due to the chart script not being loaded when the initial kick off script is run, so adding a window.onload function and then adding the chart into this function should fix this
window.onload = function() {
create_chart();
}
Using window.onload did not allow for the script to load, so using a DOMContentLoaded event listener fixes this issue.
document.addEventListener("DOMContentLoaded", function(event) {
create_chart();
});
HTML
<canvas id="myChart" width="400" height="400"></canvas>Scripts
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js" integrity="sha256-R4pqcOYV8lt7snxMQO/HSbVCFRPMdrhAFMH+vr9giYI=" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.css" integrity="sha256-aa0xaJgmK/X74WM224KMQeNQC2xYKwlAt08oZqjeF0E=" crossorigin="anonymous" />Javascript
window.onload = function() {
create_chart();
}
document.addEventListener("DOMContentLoaded", function(event) {
create_chart();
});
function create_chart() {
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
}View Statistics
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
