I am using Jquery Flot to create a pie chart based on three different values, pause, nopause and sleeping. Initially it draws th pie chart correctly but after some redraw it gives me the following error.
Could not draw pie with labels contained inside canvas
My code is
Lecturer.socket.onmessage = function (message) {
var str = message.data;
var msg = str.split(":");
if(msg[0] == 'pause'){
var pause = parseInt(msg[1]);
var noPause = parseInt(msg[2]);
var sleeping = parseInt(msg[3]);
var data = [
{label: "Pause", data:pause},
{label: "No Pause", data:noPause},
{label: "Sleeping", data:sleeping}
];
var options = {
series: {
pie: {show: true}
},
legend: {
show: false
}
};
$.plot($("#pie-placeholder"), data, options);
}
};
HTML is
<div id="live-placeholder" class="flot"></div>
All the require js libraries are included. What I m doing wrong? Any Help ?
Thanks
You've got two problems:
1.) your placeholder div id doesn't match the $.plot call. live-placeholder != pie-placeholder.
2.) You don't need to calculate the percents yourself. Flot will do it internally.
See a working fiddle here.
Related
My goal is to get 3 charts, with the most recently selected series in the first chart updating the second chart, and the most recently selected series in the second chart updating the third chart.
I start by setting up 3 divs:
<div id="chart1"></div>
<div id="chart2"></div>
<div id="chart3"></div>
I then generate 3 charts like so (essentially the same, but with different detail levels in the source data):
var chart1 = c3.generate({
bindto: document.getElementById('chart1'),
data: {
x: 'date',
url: 'file1.csv'
},
axis: {
x: {
type: 'timeseries',
tick: {
format: '%Y-%m-%d',
count: 8
},
label: "Date"
},
y: {
label: "Y Label"
}
},
// irrelevant options removed
legend: {
item: {
onclick: (id) => {
chart1.toggle(id);
chart_options2.data.url = 'file2_'+ id +'.csv';
if(chart1.data.shown(id).length == 1 ){
generateChart2(id);
}
}
}
}
});
var chart2 = c3.generate({
bindto: document.getElementById('chart2'),
// etc.
var chart3 = c3.generate({
bindto: document.getElementById('chart3'),
// etc.
The function generateChart2() will use the id of the selected series in chart1 to generate a new chart in the place of chart2. Likewise I have a similar function generateChart3() which will use the id of the selected series in chart2 to generate a new chart in the place of chart3. These functions look like this:
function generateChart2(id) {
c3.generate(chart_options2);
};
With chart_options being identical to the original set up options, except for the updated file source (see chart_options2.data.url = 'file2_'+ id +'.csv'; above).
Initially, these all seem to work ok. The problem arises when a new chart2 is created using the generateChart2() function, and the onclick property no longer seems to work for certain things. Testing with console.log, the onclick still seems to be called, and I can update the chart options var, but I can't use any of the other commands:
onclick: function (id) {
console.log('test'); // returns 'test'
chart2.toggle(id); // doesn't work
chart_options3.data.url = 'file3_'+ id +'.csv'; // works
if(chart2.data.shown(id).length == 1 ){
generateChart3(id); // doesn't work
}
I suspect it has something to do with the namespace, or how I'm using the chart names, or how I'm calling the function. I've spent a couple of days looking at this problem, but all my research hasn't really made it much clearer which direction I should be looking in.
EDIT: I found a workaround, which makes sense for my use case, but doesn't help me learn what I was doing wrong. Now instead of reusing c3.generate to dynamically create a new chart every time a series is selected in the previous chart, I am using unload() and load(). This seems to be working well, but I would very much appreciate an explanation or clarification of what I was doing wrong the first time. Updated code:
onclick: function (id) {
chart1.toggle(id);
if(chart1.data.shown(id).length == 1 ){
chart2.unload();
setTimeout(function () {
chart2.load({
url: 'file2_'+ id +'.csv'
});
}, 1000);
}
}
I need to create custom legend for my donut chart using ChartJS library.
I have created donut with default legend provided by ChartJS but I need some modification.
I would like to have value above the car name. Also I don't like sticky legend I want to have it separate from donut so I can change the style for fonts, boxes (next to the text "Audi" for example)
I know there is some Legend generator but I'm not sure how to use it with VueJS - because I'm using VueJS as a framework
This is how my legend looks like now - http://imgur.com/a/NPUoi
My code:
From Vue component where I import a donut component:
<div class="col-md-6">
<div class="chart-box">
<p class="chart-title">Cars</p>
<donut-message id="chart-parent"></donut-message>
</div>
</div>
Javascript:
import { Doughnut } from 'vue-chartjs'
export default Doughnut.extend({
ready () {
Chart.defaults.global.tooltips.enabled = false;
Chart.defaults.global.legend.display = false;
this.render({
labels: ['Audi','BMW','Ford','Opel'],
datasets: [
{
label: 'Cars',
backgroundColor: ['#35d89b','#4676ea','#fba545','#e6ebfd'],
data: [40, 30, 20, 10]
}
]
},
{
responsive: true,
cutoutPercentage: 75,
legend: {
display: true,
position: "right",
fullWidth: true,
labels: {
boxWidth: 10,
fontSize: 14
}
},
animation: {
animateScale: true
}
})
}
});
I'm having the same problem trying to understand the documentation and this link might clarify the process of customize the legends:
https://codepen.io/michiel-nuovo/pen/RRaRRv
The trick is to track a callback to build your own HTML structure and return this new structure to ChartJS.
Inside the options object:
legendCallback: function(chart) {
var text = [];
text.push('<ul class="' + chart.id + '-legend">');
for (var i = 0; i < chart.data.datasets[0].data.length; i++) {
text.push('<li><span style="background-color:' +
chart.data.datasets[0].backgroundColor[i] + '">');
if (chart.data.labels[i]) {
text.push(chart.data.labels[i]);
}
text.push('</span></li>');
}
text.push('</ul>');
return text.join("");
}
Second, you need a container to insert the new html and using the method myChart.generateLegend() to get the customized html:
$("#your-legend-container").html(myChart.generateLegend());
After that, if you need, track down the events:
$("#your-legend-container").on('click', "li", function() {
myChart.data.datasets[0].data[$(this).index()] += 50;
myChart.update();
console.log('legend: ' + data.datasets[0].data[$(this).index()]);
});
$('#myChart').on('click', function(evt) {
var activePoints = myChart.getElementsAtEvent(evt);
var firstPoint = activePoints[0];
if (firstPoint !== undefined) {
console.log('canvas: ' +
data.datasets[firstPoint._datasetIndex].data[firstPoint._index]);
}
else {
myChart.data.labels.push("New");
myChart.data.datasets[0].data.push(100);
myChart.data.datasets[0].backgroundColor.push("red");
myChart.options.animation.animateRotate = false;
myChart.options.animation.animateScale = false;
myChart.update();
$("#your-legend-container").html(myChart.generateLegend());
}
}
Another solution that I found, if you don't need to change the HTMl structure inside the legend, you can just insert the same HTML in your legend container and customize it by CSS, check this another link:
http://jsfiddle.net/vrwjfg9z/
Hope it works for you.
You can extract the legend markup.
data () {
return {
legendMarkup: ''
}
},
ready () {
this.legendMarkup = this._chart.generateLegend()
}
And in your template you can output it.
<div class="legend" ref="legend" v-html="legendMarkup"></div>
this._chart is the internal chartjs instance in vue-chartjs. So you can call all chartjs methods which are not exposed by vue-chartjs api over it.
However you can also use the legend generator. The usage is the same in vue. You can pass in the options, use callbacks etc.
please check this documentation
.
Legend Configuration
The chart legend displays data about the datasets that area appearing on the chart.
Configuration options
Position of the legend. Options are:
'top'
'left'
'bottom'
'right'
Legend Item Interface
Items passed to the legend onClick function are the ones returned from labels.generateLabels. These items must implement the following interface.
{
// Label that will be displayed
text: String,
// Fill style of the legend box
fillStyle: Color,
// If true, this item represents a hidden dataset. Label will be rendered with a strike-through effect
hidden: Boolean,
// For box border. See https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D/lineCap
lineCap: String,
// For box border. See https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash
lineDash: Array[Number],
// For box border. See https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineDashOffset
lineDashOffset: Number,
// For box border. See https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineJoin
lineJoin: String,
// Width of box border
lineWidth: Number,
// Stroke style of the legend box
strokeStyle: Color
// Point style of the legend box (only used if usePointStyle is true)
pointStyle: String
}
Example
The following example will create a chart with the legend enabled and turn all of the text red in color.
var chart = new Chart(ctx, {
type: 'bar',
data: data,
options: {
legend: {
display: true,
labels: {
fontColor: 'rgb(255, 99, 132)'
}
}
}
});
Custom On Click Actions
It can be common to want to trigger different behaviour when clicking an item in the legend. This can be easily achieved using a callback in the config object.
The default legend click handler is:
function(e, legendItem) {
var index = legendItem.datasetIndex;
var ci = this.chart;
var meta = ci.getDatasetMeta(index);
// See controller.isDatasetVisible comment
meta.hidden = meta.hidden === null? !ci.data.datasets[index].hidden : null;
// We hid a dataset ... rerender the chart
ci.update();
}
Lets say we wanted instead to link the display of the first two datasets. We could change the click handler accordingly.
var defaultLegendClickHandler = Chart.defaults.global.legend.onClick;
var newLegendClickHandler = function (e, legendItem) {
var index = legendItem.datasetIndex;
if (index > 1) {
// Do the original logic
defaultLegendClickHandler(e, legendItem);
} else {
let ci = this.chart;
[ci.getDatasetMeta(0),
ci.getDatasetMeta(1)].forEach(function(meta) {
meta.hidden = meta.hidden === null? !ci.data.datasets[index].hidden : null;
});
ci.update();
}
};
var chart = new Chart(ctx, {
type: 'line',
data: data,
options: {
legend: {
}
}
});
Now when you click the legend in this chart, the visibility of the first two datasets will be linked together.
HTML Legends
Sometimes you need a very complex legend. In these cases, it makes sense to generate an HTML legend. Charts provide a generateLegend() method on their prototype that returns an HTML string for the legend.
To configure how this legend is generated, you can change the legendCallback config property.
var chart = new Chart(ctx, {
type: 'line',
data: data,
options: {
legendCallback: function(chart) {
// Return the HTML string here.
}
}
});
I am using same chart in 2 different places and the data is being loaded dynamically.
In one of the place i am using HighChart and for other i use HighStock to get the Navigator,Scrollbar facility.
What i'm trying to achieve is i am loading data asynchronously and the chart shows loading text/a loader until it gets data from the server.This works perfectly fine for HighChart. But when it comes to HighStock things are not working. It shows data differently than what i am expecting it to be.
Let me explain, The chart is initialized first and when it fetches data from server i tried to log the value of xAxis here, it shows 1 for HighChart which is correct but for HighStock the statement show 2 xAxis.
//HighChart
var MyChart = {
initHighcharts: function() {
this.chart = new Highcharts.Chart({
// Chart related configuration
},
series: []
});
this.chart.showLoading();
},
updateChart: function(data) {
console.log('x axis', this.chart.xAxis);// Here i get 1 xAxis
// Load data here
this.chart.redraw();
this.chart.hideLoading();
},
};
MyChart.initHighcharts();
setTimeout(function() {
var data = someData;
MyChart.updateChart(data);
}, 2000);
I don't understand what goes wrong here when i change the HighChart to HighStock.The only piece of information i changed here is
this.chart = new Highcharts.StockChart({
//HighStock chart
var MyChart = {
initHighcharts: function() {
this.chart = new Highcharts.StockChart({
// Chart related configuration
},
series: []
});
this.chart.showLoading();
},
updateChart: function(data) {
console.log('x axis', this.chart.xAxis);// Here i get 2 xAxis
// Load data here
this.chart.redraw();
this.chart.hideLoading();
},
};
MyChart.initHighcharts();
setTimeout(function() {
var data = someData;
MyChart.updateChart(data);
}, 2000)
Here are the two fiddle that show the error i am facing,
HighChart Fiddle
HighStock Fiddle
I have logged the length of xAxis, Please open console window to see the xAxis value. Am i doing something wrong here?
Any help is much appreciated!!
Thanks
I have a c3.js stacked barchart that updates when you hover over a Leaflet map, and I need the tooltip to be static as otherwise the user will hover over other areas of the map and change the data in the barchart, before actually reaching it. However, I'm new to coding and especially new to C3 and I can't get around how to make the tooltip static. Also, does anyone know how to style the tooltip later? I have only found very complex examples online, but it feels like I should be able to do it somewhere after I generate the chart.
Any help would be much appreciated!
Here is my code:
function getMiniChartData(properties) {
var values = [
['rape', rape[properties['gss_code']]],
['other sexual', other_sexual[properties['gss_code']]]];
console.log(values);
return values;
}
var chart;
function drawMiniChart(properties) {
console.log('drawing mini chart');
var data = getMiniChartData(properties);
chart = c3.generate({
bindto: '#minichart',
color: {
pattern: ['#E31A1C', '#BD0026']
},
point: {
show: false
},
tooltip: {
show: true
},
data: {
columns: data,
type: 'bar',
groups: [
['rape', 'other sexual']
]
},
axis: {
y: {
max:60,
min:0
}
},
grid: {
y: {
lines: [{
value: 0
}]
}
}
});
}
function updateMiniChartData(properties) {
console.log('updating mini chart');
var data = getMiniChartData(properties);
chart.load({
columns: data
});
}
Just edit the position in the tooltip :
position: function () {
var position = c3.chart.internal.fn.tooltipPosition.apply(this, arguments);
position.top = 0;
return position;
}
This will set the tooltip to always be at the top of the point. So it stays at the same y coordinate (top:0) but follows the points x value. You could go further and set it to stay at one position on the page.
Check this fiddle I have put together : http://jsfiddle.net/thatOneGuy/owhxgaqm/185/
This question will help you out : C3 charts - contents of tooltip clickable
If you want it visible all the time just add this code :
var originalHideTooltip = chart.internal.hideTooltip
chart.internal.hideTooltip = function () {
setTimeout(originalHideTooltip, 100)
};
I have the following code:
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
function drawChart() {
// Create our data table out of JSON data loaded from server.
// var data = new google.visualization.DataTable('<>');
var data = google.visualization.arrayToDataTable([['Generation', 'Descendants'],[0,300], [85,300],[125,0] ]);
var options = {
title: 'Derating chart',
// Draw a trendline for data series 0.
lineWidth: 2,
hAxis: {title: 'Temperature [°C]', titleTextStyle: {color: 'black'}, logScale: false},
vAxis: {
title: "Irms [A]",
maxValue:8
},
pointSize:5
};
// Instantiate and draw our chart, passing in some options.
// Do not forget to check your div ID
var chart = new google.visualization.ScatterChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
It's quite simple, but I have the following problem:
- In my chart I have 3 points, is it possible to interpolate the values between that points? I need to display the values between them when you put the mouse over the line
There should be an option for this... but checking forums and documentation have found none. Closest to this is using a trendline, but values don´t match your line. So your only way is doing something manually. Here is a workaround I made using jquery :
//you need to have in options tooltip:{isHtml:true} for this to work
google.visualization.events.addListener(chart, 'ready', function(){
$('#chart_div svg path').mousemove(function(e){
$('.google-visualization-tooltip').remove(); // remove previous tooltips
var x=e.offsetX; // get x coordinate
var y=e.offsetY; //get y coordinate
var xValue= Math.round(chart.getChartLayoutInterface().getHAxisValue(x)); // get chart x value at coordinate
var yValue=Math.round( chart.getChartLayoutInterface().getVAxisValue(y)); // get chart y value at coordinate
// create tooltip
var tootlip = $('<div class= "google-visualization-tooltip"><ul class="google-visualization-tooltip-item-list"><li class="google-visualization-tooltip-item"><span >X : '+xValue+'</span></li><li class="google-visualization-tooltip-item"><span>Y : '+yValue+'</span></li></ul></div>');
tootlip.css({position:'absolute', left:(x+20)+'px', top:(y-100)+'px', width:'100px', height:'70px'}) // set tooltip position
$('#chart_div').append(tootlip); // add tooltip to chart
})
$('#chart_div svg path').mouseout(function(e){
$('.google-visualization-tooltip').remove();
})
})
Full fiddle: http://jsfiddle.net/juvian/48ouLbmm/
Note: without the mouseout it works better, but tooltip stays until next mouseover