I have two javascript files baseChart.js and chart.min.js. I don't want to include my chart.min.js into index.html file. I just want to include baseChart.js in my index.html.
`var s = document.createElement("script");
s.setAttribute("src","js/Chart.min.js");
document.head.appendChild(s);
class BaseChart{
constructor(area, settings) {
this.area = area;
this.settings = settings;
}
a() {
new Chart(this.area, this.settings);
console.log("BaseChart");
}
}
class BarChart extends BaseChart {
constructor(area, settings) {
super(area, settings);
}
/* constructor(ctx) {
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
},
{
label: "Second",
data: [12, 56, 45, 23, 78, 23, 90],
}
]
};
var lineChart = new Chart(ctx, {
type: 'line',
data: data
});
} */
b() {
super.a();
}
}`
Currently, this is the baseChart.js file and when I am trying to run this code, I am getting error "Chart is not defined because I used 'new Chart(this.area, this.settings);' and chart.min.js is not initialized before I call this method.". I want to initialize chart.min.js before this classes and method are initialized. I used chart.js library. So, what should I do?
I suggest you install chart.js via npm
npm install chart.js --save
and then import it like that:
// ES6
import Chart from 'chart.js';
I'm assuming that you're using some kind of bundler like webpack to make code above works. If not you have to include chart.min.js in your index file before baseChart.js
Related
I am currently trying to do a chart with chart.js, and I would like to get the total number of sales over a year in 1 month increments. I'm currently wondering how to break down the number of sales I make every month knowing that I have the "created_at" column for each order. I know how to do the total for each month with a foreach loop, but to cut out the sales and put the total in a table, I don't see how I could do it.
This is what my table looks like:
This is what my chart looks like:
moment().locale('fr');
var canvas = document.getElementById("bellegaiaChart");
var ctx = canvas.getContext('2d');
// Global Options:
Chart.defaults.global.defaultFontColor = 'black';
Chart.defaults.global.defaultFontSize = 16;
var data = {
labels: ["Jan", "Fev", "Mar", "Avr", "Mai", "Juin", "Jui", "Aoû", "Sep", "Oct", "Nov", "Dec"],
datasets: [{
label: "Ventes",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(225,0,0,0.4)",
borderColor: "red", // The main line color
borderCapStyle: 'square',
borderDash: [], // try [5, 15] for instance
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "black",
pointBackgroundColor: "white",
pointBorderWidth: 1,
pointHoverRadius: 8,
pointHoverBackgroundColor: "yellow",
pointHoverBorderColor: "brown",
pointHoverBorderWidth: 2,
pointRadius: 4,
pointHitRadius: 10,
// notice the gap in the data and the spanGaps: true
data: [65, 59, 80, 81, 56, 110, 40 ,60,55,30,78],
spanGaps: false,
}, {
label: "Nouveaux Clients",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(167,105,0,0.4)",
borderColor: "rgb(167, 105, 0)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "white",
pointBackgroundColor: "black",
pointBorderWidth: 1,
pointHoverRadius: 8,
pointHoverBackgroundColor: "brown",
pointHoverBorderColor: "yellow",
pointHoverBorderWidth: 2,
pointRadius: 4,
pointHitRadius: 10,
// notice the gap in the data and the spanGaps: false
data: [10, 20, 60, 95, 64, 78, 90,70,40,70,89, 73],
spanGaps: false,
}
]
};
// Notice the scaleLabel at the same level as Ticks
var options = {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
},
scaleLabel: {
display: true,
labelString: 'Moola',
fontSize: 20
}
}]
}
};
// Chart declaration:
var myBarChart = new Chart(ctx, {
type: 'line',
data: data,
options: options
});
This chart is currently integrated in my blade view.
The goal would be to have a table containing all the sales totals per month (so 12 entries in the table) in order to be able to specify it in the data of my chart.
I want to display a chart with Chartjs which displays real time data and slowly scrolls along the x axis, I have tried it here with js fiddle and it just jumps like crazy up and down: https://jsfiddle.net/rsnufpq7/
The graph should just move to the left side with the old points out of view without this animation like in the second example here: https://bost.ocks.org/mike/path/
var canvas = document.getElementById('myChart');
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: false,
lineTension: 0.0,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 5,
pointHitRadius: 10,
data: [65, 59, 80, 0, 56, 55, 40],
}
]
};
var zero = 7;
function adddata(){
var value = Math.floor((Math.random() * 10) + 1);;
myLineChart.data.labels.push(zero);
myLineChart.data.labels.splice(0, 1);
myLineChart.data.datasets[0].data.splice(0, 1);
myLineChart.data.datasets[0].data.push(value);
myLineChart.update();
zero++;
}
setInterval(function(){
adddata();
},1000);
var option = {
showLines: true
};
var myLineChart = Chart.Line(canvas,{
data:data,
options:option
});
Your code works as expected, only thing that you are missing is your y axis does not have range defined and it is being dynamically adjusted.
In order to achieve this I have extended your options to look like this.
var option = {
showLines: true,
scales: {
yAxes: [{
display: true,
ticks: {
beginAtZero:true,
min: 0,
max: 100
}
}]
}
};
I have defined min and max value for y axis and it is not jumping anymore.
Here is a working fiddle
I have the following code in a simple Bootstrap html file which displays a Chart.js line chart.
<div class="card-block chartjs">
<canvas id="line-chart" height="500"></canvas>
</div>
The js file that contains the chart's setup looks like this:
$(window).on("load", function(){
var ctx = $("#line-chart");
var chartOptions = {
responsive: true,
maintainAspectRatio: false,
legend: {
position: 'bottom',
},
hover: {
mode: 'label'
},
scales: {
xAxes: [{
display: true,
gridLines: {
color: "#f3f3f3",
drawTicks: false,
},
scaleLabel: {
display: true,
labelString: 'Month'
}
}],
yAxes: [{
display: true,
gridLines: {
color: "#f3f3f3",
drawTicks: false,
},
scaleLabel: {
display: true,
labelString: 'Value'
}
}]
},
title: {
display: true,
text: 'Chart.js Line Chart - Legend'
}
};
var chartData = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
data: [65, 59, 80, 81, 56, 55, 40],
fill: false,
borderDash: [5, 5],
borderColor: "#9C27B0",
pointBorderColor: "#9C27B0",
pointBackgroundColor: "#FFF",
pointBorderWidth: 2,
pointHoverBorderWidth: 2,
pointRadius: 4,
}, {
label: "My Second dataset",
data: [28, 48, 40, 19, 86, 27, 90],
fill: false,
borderDash: [5, 5],
borderColor: "#00A5A8",
pointBorderColor: "#00A5A8",
pointBackgroundColor: "#FFF",
pointBorderWidth: 2,
pointHoverBorderWidth: 2,
pointRadius: 4,
}, {
label: "My Third dataset - No bezier",
data: [45, 25, 16, 36, 67, 18, 76],
lineTension: 0,
fill: false,
borderColor: "#FF7D4D",
pointBorderColor: "#FF7D4D",
pointBackgroundColor: "#FFF",
pointBorderWidth: 2,
pointHoverBorderWidth: 2,
pointRadius: 4,
}]
};
var config = {
type: 'line',
options : chartOptions,
data : chartData
};
var lineChart = new Chart(ctx, config);
});
I would like to avoid using a separated javascript file and rather just have everything in my Jinja2/Flask html page. A working example can be found in this tutorial, this is the same way that I would like to follow. I have tried to copy any paste the js part to my html page and put between <script> tags, but unfortunately it doesn't work.
Here is how I tried:
# in my jinja2/flask html page
<div class="card-body collapse in">
<div class="card-block chartjs">
<canvas id="line-chart" height="500"></canvas>
</div>
</div>
<script>
var ctx = $("#line-chart");
var chartOptions = {
responsive: true,
maintainAspectRatio: false,
legend: {
position: 'bottom',
},
hover: {
mode: 'label'
},
scales: {
xAxes: [{
display: true,
gridLines: {
color: "#f3f3f3",
drawTicks: false,
},
scaleLabel: {
display: true,
labelString: 'Month'
}
}],
yAxes: [{
display: true,
gridLines: {
color: "#f3f3f3",
drawTicks: false,
},
scaleLabel: {
display: true,
labelString: 'Value'
}
}]
},
title: {
display: true,
text: 'Chart.js Line Chart - Legend'
}
};
// Chart Data
var chartData = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
data: [65, 59, 80, 81, 56, 55, 40],
fill: false,
borderDash: [5, 5],
borderColor: "#9C27B0",
pointBorderColor: "#9C27B0",
pointBackgroundColor: "#FFF",
pointBorderWidth: 2,
pointHoverBorderWidth: 2,
pointRadius: 4,
}, {
label: "My Second dataset",
data: [28, 48, 40, 19, 86, 27, 90],
fill: false,
borderDash: [5, 5],
borderColor: "#00A5A8",
pointBorderColor: "#00A5A8",
pointBackgroundColor: "#FFF",
pointBorderWidth: 2,
pointHoverBorderWidth: 2,
pointRadius: 4,
}, {
label: "My Third dataset - No bezier",
data: [45, 25, 16, 36, 67, 18, 76],
lineTension: 0,
fill: false,
borderColor: "#FF7D4D",
pointBorderColor: "#FF7D4D",
pointBackgroundColor: "#FFF",
pointBorderWidth: 2,
pointHoverBorderWidth: 2,
pointRadius: 4,
}]
};
var config = {
type: 'line',
// Chart Options
options : chartOptions,
data : chartData
};
// Create the chart
var lineChart = new Chart(ctx, config);
});
</script>
Unfortunately I'm not so familiar with JS and don't have more ideas about what should I do to display the chart in my Flask app. What do I need to implement to make it work?
First make sure the required JS is referenced in your template (or the template it extends).
Assuming you serve it from static/js folder:
<head>
...
<script src='/static/js/Chart.bundle.min.js'></script>
...
</head>
Your script tag content looks mostly fine, just a little modification getting the context, and you appear to have a trailing }); that you need to remove:
<script>
// get context
var ctx = document.getElementById("line-chart").getContext("2d");
....
// Create the chart
var lineChart = new Chart(ctx, config);
// REMOVE THIS FROM THE END OF YOUR SCRIPT
//});
</script>
As bgse said in his answer you need to load library first. I suggest you use CDN as that way you don't need to download ChartJS library.
Secondly, you're writing some JS that may be executed before library is fetched to the page. So what would I add is:
<div class="card-body collapse in">
<div class="card-block chartjs">
<canvas id="line-chart" height="500"></canvas>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
<script>
$(document).ready(function(){
// Your JS code here
// ...
});
</script>
This way script code will execute when all JS is loaded.
I want to know that if it is possible to show more values on point hover in chart.js.
Have a look in this fiddle.
This is a smiple graph example taken from the chart.js site. If i hover a point it shows the dataset value.
How can i show other value. like along this array.
[65, 59, 80, 81, 56, 55, 40]
if i want to show this array values
[1, 2, 3, 4, 5, 6, 7]. Like i want to show numbering. This is just an example actually i want to show more two values but not want to plot it on the graph only showed in the pointhover. Like on 65 it tells that it is 1th value.
Any kind of help would be much appreciated.
Yes it is possible, please use tooltips option as below
var ctx = document.getElementById('chart1').getContext("2d");
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
}
]
};
var options = {
responsive: true,
title: {
display: true,
position: "top",
text: 'anything',
fontSize: 18,
fontColor: "#111"
},
tooltips: {
enabled: true,
mode: 'single',
callbacks: {
label: function(tooltipItems, data) {
var multistringText = [tooltipItems.yLabel];
multistringText.push('Another Item');
multistringText.push(tooltipItems.index+1);
multistringText.push('One more Item');
return multistringText;
}
}
},
legend: {
display: true,
position: "bottom",
labels: {
fontColor: "#333",
fontSize: 16
}
},
scales:{
yAxes:[{
ticks:{
min:0
}
}]
}
};
var myLineChart = new Chart(ctx, {
type: 'line',
data: data,
options: options
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.js"></script>
<canvas id="chart1"></canvas>
If you want to show data below the existing item in the tooltips you can use the 3 different tooltip footer callbacks. Just define what you want to show as arrays outside of the scope of chart.js and reference it using an index.
tooltips: {
enabled: true,
mode: 'single',
callbacks: {
beforeFooter: function(tooltipItems, data) {
return 'Point #: ' + footerLine1[tooltipItems[0].index];
},
footer: function(tooltipItems, data) {
return 'Other Data: ' + footerLine2[tooltipItems[0].index];
}
}
},
Keep in mind that you only have 3 lines to work with (e.g. 3 footer callbacks)
See the example here.
tooltips: {
mode: 'index'
}
add this to options
I'm trying to draw a line chart with chartjs, but i can't get it working - keep getting 't is undefined' error.
here is my fiddle example: http://jsfiddle.net/6bjy9nxh/344/
can anyone figure out what im doing wrong here?
chartjs: http://www.chartjs.org/docs/#line-chart-example-usage
cdn: https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js
html
<canvas id="myChart" width="500" height="350"></canvas>
javascript
var ctx = document.getElementById("myChart");
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
}
]
};
var myLineChart = new Chart(ctx, {
type: 'line',
data: data,
});
You are including version 1, you need version 2 for Chart.js
https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.3/Chart.min.js
http://jsfiddle.net/x55sgzgf/