chart.js 'Chart' is not defined no-undef - javascript

i ran my program in node.js localhost but it has an error. I have already install npm chart.js
./src/index.js
Line 2: 'Chart' is not defined no-undef
In my index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.js"></script>
</head>
<body>
<canvas id="myChart"></canvas>
</body>
</html>
In my index.js:
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: {
y: {
beginAtZero: true
}
}
}
});

Related

Creating charts in django - errors on javascript

I want to create a chart with some data from my db, I did the same think like I saw on the internet, but I got a few errors
base.html
<script>
$(document).ready(function(){
{% block scripts %} {% endblock scripts %}
})
</script>
The errors are on the row {% block scripts %} {% endblock scripts %}
Why it's showing me this errors? I am new in Js...
Here is the video that I watched: https://www.youtube.com/watch?v=B4Vmm3yZPgc
Edited
results.html
{% block scripts %}
<script>
$(document).ready(function(){
const ctx = document.getElementById('myChart').getContext('2d');
const 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: {
y: {
beginAtZero: true
}
}
}
});
});
</script>
{% endblock scripts %}

Try this
base.html
<script>
$(document).ready(function(){
{% block scripts %} {% endblock scripts %}
});
</script>
Results.html
{% block scripts %}
const ctx = document.getElementById('myChart').getContext('2d');
const 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)',
'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)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
y: {
beginAtZero: true
}
}
}
});
{% endblock scripts %}

How to move a chart.js to the center

I just coded my first chart in chart.js, but i cant move it to the center of my webpage
here is my code for the chart in html:

Use "display:block;margin:0 auto;" to center the div containing the JS table.

Make a container for your canvas and give it display: inline-block style. Then you can treat the container like any html block.
var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
type: 'line',
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
}
}]
}
}
});
.outbox{
text-align: center;
}
.container{
width: 50%;
display: inline-block;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>
<div class="outbox">
<div class="container">
<canvas id="myChart" width="400" height="400"></canvas>
</div>
</div>

You want to center the canvas since that is where the chart is drawn on. To center the canvas see this stack article: How to center canvas in html5

ChartJS not working in Chrome extension

I have a file named index.html in my Chrome extension that uses ChartJS to draw a chart. This is the markup :
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Welcome to dashboard</title>
<link rel="stylesheet" href="./style.css">
<script src="scripts/Chart.min.js"></script>
</head>
<body>
<canvas id="chart" height="400" width="900"></canvas>
<script src="./script.js"></script>
</body>
And this is the script:
var ctx = document.getElementById("chart").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
}
}]
}
}
});
I am not getting any error in console. But still, the page is rendered blank. What could be the issue with this code?

Run the function on load

I have composed the following code using chart.js for creating the chart and downloading it on clicking the button, but now i am unable to tune the same code for it to download the image when the page is loaded so that there is no user interaction and i have the downloaded image when the page is triggered.
<html>
<head>
<script type="text/javascript" src="https://cdn.rawgit.com/eligrey/canvas-toBlob.js/master/canvas-toBlob.js"></script>
<script type="text/javascript" src="Chart.js"></script>
<script type="text/javascript" src="https://cdn.rawgit.com/eligrey/FileSaver.js/master/FileSaver.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js" integrity="sha384-3ceskX3iaEnIogmQchP8opvBy3Mi7Ce34nWjpBIwVTHfGYWQS9jwHDVRnpKKHJg7" crossorigin="anonymous"></script>
</head>
<body>
<canvas id="myChart" width="400" height="400"></canvas>
<br/><br/>
<button id="save-btn">Save Chart Image</button>
<script>
// Get the context of the canvas element we want to select
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
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,
data: [65, 59, 80, 81, 56, 55, 40],
}
]
};
var ctx = document.getElementById("myChart").getContext("2d");
var myNewChart = new Chart(ctx).Bar(data);
$("#save-btn").click(function() {
$("#myChart").get(0).toBlob(function(blob) {
saveAs(blob, "chart_1");
});
});
</script>
</body>
</html>
Kindly suggest me the solution.Thanks in advance.

This can be achieved by adding the following piece of code in your chart options ...
onAnimationComplete: function() {
$("#save-btn").click();
}
Here is a working example ...
<html>
<head>
<script type="text/javascript" src="https://cdn.rawgit.com/eligrey/canvas-toBlob.js/master/canvas-toBlob.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<script type="text/javascript" src="https://cdn.rawgit.com/eligrey/FileSaver.js/master/FileSaver.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js" integrity="sha384-3ceskX3iaEnIogmQchP8opvBy3Mi7Ce34nWjpBIwVTHfGYWQS9jwHDVRnpKKHJg7" crossorigin="anonymous"></script>
</head>
<body> <canvas id="myChart" width="400" height="400"></canvas> <br/> <br/> <button id="save-btn">Save Chart Image</button>
<script>
// Get the context of the canvas element we want to select
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
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,
data: [65, 59, 80, 81, 56, 55, 40],
}
]
};
var ctx = document.getElementById("myChart").getContext("2d");
var myNewChart = new Chart(ctx).Bar(data, {
onAnimationComplete: function() {
$("#save-btn").click();
}
});
$("#save-btn").click(function() {
$("#myChart").get(0).toBlob(function(blob) {
saveAs(blob, "chart_1");
});
});
</script>
</body>
</html>
note: be aware that, the user will be prompted with a save as dialog box on page load

how to show bar chart for every product

I'm trying to print a bar chart for every product to show a summary of data but the bar chart is showing only once with different values at y-axis.
How can I show the data for each product on a bar chart?
Review.js
angular.module('App.review',[]).directive('review', function($cookieStore){
return{
restrict:'E',
controller:function($scope, $window, $http){
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'horizontalBar',
data: {
labels: ["Rating", "Blue", "Yellow", "Green", "Purple", "O"],
datasets: [{
label: '# of Votes',
data: $scope.data,
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: {
xAxes: [{
display: false,
stacked: false,
ticks: {
min: 0,
max: 10
}
}]
}
}
});
},
templateUrl:'scripts/directives/ReviewDirective/review.html',
transclude:false
}
});
review.html
<div style="width:100%; border:solid green;">
<canvas id="myChart" width="100" height="100vh"></canvas>
</div>
product.html
<td ng-controller="ReviewsCtrl" >
<div data-ng-repeat="r in dataList" >
<div data-ng-if=" r.id == item.productId">
<div data-ng-init="data =r.data" >
{{data=r.data}}
<review></review>
</div>
</div>
</div>
</td>

Check this code
var app = angular.module('App.review', []);
app.directive('review', function () {
return {
restrict: 'E',
scope: {
data: "=data"
},
link: function ($scope, element, attrs) {
var ctx = element[0].querySelector('#myChart');
var myChart = new Chart(ctx, {
type: 'horizontalBar',
data: {
labels: ["Rating", "Blue", "Yellow", "Green", "Purple", "O"],
datasets: [{
label: '# of Votes',
data: $scope.data,
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
xAxes: [{
display: false,
stacked: false,
ticks: {
min: 0,
max: 10
}
}]
}
}
});
},
templateUrl: 'review.html',
transclude: false
}
});
app.controller('ReviewsCtrl', function ($scope) {
$scope.dataList = [{
productId: 1,
productName: 'One',
data: [1, 2, 3, 4, 5]
}, {
productId: 2,
productName: 'Two',
data: [6, 7, 8, 1, 1]
}];
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.6/angular.min.js"></script>
<div ng-app="App.review">
<table>
<tr>
<td ng-controller="ReviewsCtrl">
<div data-ng-repeat="r in dataList">
{{r.productName}}
<review data="r.data"></review>
</div>
</td>
</tr>
</table>
<script type="text/ng-template" id="review.html">
<div style="width: 100%; border: solid green;">
<canvas id="myChart" width="100" height="100vh"></canvas>
</div>
</script>
</div>

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