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I have an issue inserting in Chart.js only two values(timestamp and cpu telemetry) from external JSON(which is located remotely on VPS). In Console all data loaded correctly, my code is:
var theCpuUrl = "http://" + address + "/api/metric/cpu";
var xmlhttp = new XMLHttpRequest();
var ctx = document.getElementById('cpuchart').getContext('2d');
var cpuchart = new Chart(ctx, {
type: 'bar',
data: {
labels: '......',
datasets: [{
label: 'cpu',
data: [80, 70, 80, 20, 10, 50],
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: false
}
}]
}
}
}
});
httpGetAsync(theCpuUrl, function(data, status) {
var myData = JSON.parse(data);
for (var i = 0; i < myData[0].length; i++) {
let time = myData[0][i].timestamp;
let value = myData[0][i].cpu;
}
});
xmlhttp.open("GET", theCpuUrl, true);
console.log(xmlhttp.readyState);
This code is also connected to global.js with next code:
var address = "192.168.13.60:12345"
function httpGetAsync(theUrl, callback) {
var xmlHttp = new XMLHttpRequest();
xmlHttp.onreadystatechange = function() {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
callback(xmlHttp.responseText);
}
xmlHttp.open("GET", theUrl, true);
xmlHttp.setRequestHeader("Access-Control-Allow-Origin", "*");
xmlHttp.send(null);
}
Please somebody can you explain me how do I draw data on Y and X axis.
Thank you very much.
Welcome to Stackoverflow. The issue is coming because you have initialised the chart first new Chart and you're getting the updated values asynchronously. You can solve this problem by initialising chart once you have received the data.
e.g.
httpGetAsync(theCpuUrl, function(data, status) {
var myData = JSON.parse(data);
// storing time and values
let time=[], value=[];
for (var i = 0; i < myData[0].length; i++) {
time.push(myData[0][i].timestamp);
value.push(myData[0][i].cpu);
}
// now you have data in time and value array ready
--> here call the "new Chart" which you're calling above. <--
});
I want to create a pie chart with chart.js, but it can't display the chart. I spent a day trying to solve this problem, but there was no good result. I hope someone can help me.
My database has different companies, I need to calculate the total sales of each company and display in the pie chart.
I think the problem would be $results_sum = "SELECT SUM(total_of_gp_fee) AS Total FROM gp WHERE cshortcut=$subjectData('cshortcut')";, since there has many sales record for different company and I am not sure if that is correct code.
<?php
include_once("connection.php");
$results_sum = "SELECT cshortcut,SUM(total_of_gp_fee) AS Total FROM gp GROUP BY cshortcut";
$result_sum = mysqli_query($conn, $results_sum) or die("error to fetch data");
if ($result_sum->num_rows > 0) {
// output data of each row
$labels = $data = '';
while($row = $result_sum->fetch_assoc()) {
//get the company name separated by comma for chart labels
$labels.= '"' .$row["cshortcut"]. '",';
//get the total separated by comma for chart data
$data.= $row["Total"].',';
}
}?>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>test</title>
<script src="chart/Chart.bundle.js"></script>
</head>
<body>
<div class="container">
<canvas id="myChart" width="300" height="100"></canvas>
</div>
script part
<script>
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'pie',
data: {
labels: [<?php echo trim($labels);?>],
datasets: [{
label: '# of Votes',
data: [<?php echo trim($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)',
'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)',
'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)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
},
//Add the tooltips
tooltips: {
callbacks: {
label: function(tooltipItem) {
return "€ " + Number(tooltipItem.yLabel);
}
}
},
}
},
);
</script>
1- get the company name and SUM of total_of_gp_fee group by company.
include_once("connection.php");
//get the company name and total_of_gp_fee of that company.
$results_sum = "SELECT cshortcut,SUM(total_of_gp_fee) AS Total FROM gp GROUP BY cshortcut";
$result_sum = mysqli_query($conn, $results_sum) or die("error to fetch data");
if ($result_sum->num_rows > 0) {
// output data of each row
$labels = $data = '';
while($row = $result_sum->fetch_assoc()) {
//get the company name separated by comma for chart labels
$labels.= '"' .$row["cshortcut"]. '",';
//get the total separated by comma for chart data
$data.= $row["Total"].',';
}
}
2- Update the value of labels and data in chart.
labels: [<?php echo trim($labels);?>],
datasets: [{
label: '# of Votes',
data: [<?php echo trim($data);?>],
3- Add the tooltips for bar chart.
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
},
//Add the tooltips
tooltips: {
callbacks: {
label: function(tooltipItem) {
return "€" + Number(tooltipItem.yLabel);
}
}
},
}
4- Add tooltips for pie chart.
tooltips: {
callbacks: {
label: function(tooltipItem, data) {
var allData = data.datasets[tooltipItem.datasetIndex].data;
var tooltipData = allData[tooltipItem.index];
var total = 0;
for (var i in allData) {
total += allData[i];
}
var tooltipPercentage = Math.round((tooltipData / total) * 100);
return "€" + ': ' + tooltipData + ' (' + tooltipPercentage + '%)';
}
}
},
I think cshortcut holds the name of the comany, so you can do it all with one query:
$results_sum = "SELECT cshortcut,SUM(total_of_gp_fee) AS Total FROM gp GROUP BY cshortcut";
And you will get an array with to elements (cshortcut and Total) for each element in the array
Anyway, you have an error in your JS, you are using a name that doesn 't exist in your data (total_of_gp_fee) because you are using an alias (Total), you should change:
labels: [<?php while ($b = mysqli_fetch_array($result_cut)) { echo '"' . $b['cshortcut'] . '",';}?>],
datasets: [{
label: '# of Votes',
data: [<?php while ($p = mysqli_fetch_array($sum)) { echo '"' . $p['Total'] . '",';}?>],
I am want to use data and level dynamic by ajax, so i am using as below but not working.
My ajax return data in json_encode of php.
My code is:
success: function (result) {
result = JSON.parse(result);
var labels = result['labels'];
var data = result['data'];
//console.log(data);
var ctx = document.getElementById("chartbtc");
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: [labels],
datasets: [{
label: 'Market Price (USD)',
data: [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: {
responsive: true,
maintainAspectRatio: false,
scales: {
yAxes: [{
ticks: {
beginAtZero: false
}
}]
}
}
});
}
But chart is not generating:
Ajax result is:
{"labels":"13-Nov-2017, 14-Nov-2017, 15-Nov-2017, 16-Nov-2017, 17-Nov-2017, 18-Nov-2017, 19-Nov-2017, 20-Nov-2017, 21-Nov-2017, 22-Nov-2017, 23-Nov-2017, 24-Nov-2017, 25-Nov-2017, 26-Nov-2017, 27-Nov-2017, 28-Nov-2017, 29-Nov-2017, 30-Nov-2017, 01-Dec-2017, 02-Dec-2017, 03-Dec-2017, 04-Dec-2017, 05-Dec-2017, 06-Dec-2017, 07-Dec-2017, 08-Dec-2017, 09-Dec-2017, 10-Dec-2017, 11-Dec-2017, 12-Dec-2017","data":"6550.22, 6635.41, 7301.42, 7815.03, 7786.88, 7817.14, 8007.65, 8255.59, 8059.8, 8268.03, 8148.94, 8250.97, 8707.4, 9284.14, 9718.29, 9952.5, 9879.32, 10147.37, 10883.91, 11071.36, 11332.62, 11584.82, 11878.43, 13540.98, 16501.97, 16007.43, 15142.83, 14869.8, 16762.11, 17276.39"}
Since you have provided your ajax result, this will not work with the chart generation. In your case result["labels"] is a string and you are just making a list with 1 element which is the whole string(which is not valid for the labels property and will not work). What you should do is split the string, format it correctly and then supply it as a list to the labels property. Easiest way would be to use the split() function, and in your case you could split by ", ". Although I would recommend to implement a better response if its possible (have it something like so: {"labels": ["13-Nov-2017", "14-Nov-2017", ...]}).
Hope this helps!
For the first time you can fill the chart with your own value, but when it is coming for dynamically appending data then you should remove the canvas element and regenerate it. So that your data will get appended dynamically on chart.
You can try something like this.
<canvas id="chartbtc" class="canvasChart"></canvas>
<script>
dynamicDataAppendOnChart(labels, data); // On page loading you will be having your own data so you can pass them, or if you want that to be happen with ajax when page loading itself you can trigger the click event.
$('#btnClick').trigger('click');
// You will be calling the function with click event...
$('#btnClick').on('click', function () {
var data = '', labels = '';
$.ajax({
url: url,
type: "POST",
data: data,
async: isAsync,
success: function (result) {
result = JSON.parse(result);
labels = result['labels'];
data = result['data'];
}
});
dynamicDataAppendOnChart(labels, data); // Now you can call the function by passing labels and data
});
function dynamicDataAppendOnChart() {
$('#chartbtc').remove();
$('#appendTheCanvasElement').append('<canvas id="chartbtc" class="canvasChart"><canvas>'); // This would create new canvas element every time and removes the older one.
var ctx = document.getElementById("chartbtc");
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: [labels],
datasets: [{
label: 'Market Price (USD)',
data: [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: {
responsive: true,
maintainAspectRatio: false,
scales: {
yAxes: [{
ticks: {
beginAtZero: false
}
}]
}
}
});
}
</script>
Try This.
Declare label and data as
var labels = result['labels'].split(","); // Return Array of Strings Of labels
var data = JSON.parse("[" + result['data'] + "]");// return array of data
Chage
labels: [labels],
data: [data],
to
labels: labels,
data: data,
Because it already in array
A few days can make a graph, we need your guidance.
Arrow displays the objects, but on the chart nothing is displayed. The search was not successful.
My models:
public class Voting
{
public int Id { get; set; }
public string Name { get; set; }
public int Voice { get; set; }
public DateTime DateVote { get; set; }
public string IpAdress { get; set; }
}
My controller:
[HttpGet]
public JsonResult GetVotings()
{
List<Voting> votings = db.Votings.ToList();
return Json(votings, JsonRequestBehavior.AllowGet);
}
Probably the main problem in the script calling the data did. While it is possible the controller is not properly configured to output data, will be very glad of your help.
My View:
<canvas id="ChartVote" width="300" height="200"></canvas>
<script type="text/javascript" charset="utf-8">
$(function () {
$.ajax({
type: "GET",
contentType: "application/json; charset=utf-8",
dataType: 'json',
url: '/Chart/GetVotings',
}).done(function (votings) {
console.log(votings);
$.each(votings, function (index, data) {
myChart.labels.push(data.Name);
myChart.datasets[0].data.push(data.Voice);
});
});
});
var ctx = document.getElementById("ChartVote");
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: [],
datasets: [{
label: '# of Votes',
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: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
</script>
Your code has few problems ! First of all, inside your $.each you are trying to access labels property of myChart. But you did not define what myChart variable is. So you are going to get an undefined error!
Another thing to think about is, your ajax call is asynchronous. It may take a long time to get the data. So whenever you get the data, you need to execute the code to render the chart with that data. I suggest you move that code to a method and call that method in your ajax call's success/done event.
This should work.
function renderChart(labels, voice) {
var ctx = document.getElementById("ChartVote");
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: labels,
datasets: [{
label: '# of Votes', data: voice,
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 }
}]
}
}
});
}
Now in your ajax call's done event, you can pass the label array and data array to your RenderChart method.
$(function(){
$.ajax({
type: "GET",
url: '#Url.Action("GetVotings","Chart")',
}).done(function (votings) {
var labelsArray = [];
var dataArray = [];
$.each(votings, function (index, data) {
labelsArray.push(data.Name);
dataArray.push(data.Voice);
});
renderChart(labelsArray, dataArray);
});
});
I have a project to do that I create a json object from a database and then I need to get it with the help of ajax and split it into two arrays so I can use the values to create a chart on chart.js.I can get the json object but the problem is that when i try to loop through it to create my two arrays I get undefined values instead of the values that the json contains...It maybe be something really stupid but I still learning so I cant figure it out.I already tried many of the answers that were given in other similar cases but nothing worked.
When I try to run my data.php that creates the json I get this on my browser:
[{"name":"Messenger","number":"29"},{"name":"Viber","number":"28"},{"name":"Facebook","number":"28"},{"name":"Skype","number":"17"}]
My javascript to get the json,split it into two arrays and create the chart:
$(document).ready(function(){
$.ajax({
url: "http://localhost/project_test/data.php",
method: "GET",
success: function(data) {
console.log(data);
//trying to create the two arrays...
var applications = [];
var number = [];
for(var i in data) {
applications.push("App name " + data[i]['name']);
number.push(data[i].number);
}
console.log(applications);
console.log(number);
//chart.js things....
var ctx = $("#mycanvas");
var barGraph = new Chart(ctx, {
type: 'line',
data: {
labels: applications,
datasets: [{
label: 'Chart',
data: number,
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
}
}]
}
}
});
},
error: function(data) {
console.log(data);
}
});
});
I used both ways ( data[i].name and data[i]['name'] ) to get the values but none of them worked.
my console logs
You are using a for in loop, instead of a for loop.
for(var i in data) {
applications.push("App name " + data[i]['name']);
number.push(data[i].number);
}
should be
for(var i = 0; i < data.length; i++) {
applications.push("App name " + data[i]['name']);
number.push(data[i].number);
}
You are getting an array of objects. With jQuery, you can approach the 2 arrays like this:
var data = [{"name":"Messenger","number":"29"},{"name":"Viber","number":"28"},{"name":"Facebook","number":"28"},{"name":"Skype","number":"17"}];
var names = [];
var numbers = [];
$.each(data, function(i, row) {
names.push(row.name);
numbers.push(row.number);
});
Fiddle