Develop Reference

My chart is not shown on browser screen using chart.js in meteor

My chart is not shown on browser screen. I am using chart.js with meteor and also trying to do it with onRendered or onCreated but it didn't work for me.
Here is my code
<div class="pie-canvas">
<canvas id="myChart" width="350" height="350"></canvas>
</div>
Js file ->
Template.home.rendered = function() {
Deps.autorun(function() { drawChart(); });
};
function drawChart() {
var oldCount = 2;
var newCount = 4;
var data = [{
value: newCount,
color: "#e53935",
highlight: "#c62828",
label: "New"
}, {
value: oldCount,
color: "#3949ab",
highlight: "#1a237e",
label: "Regular"
}];
var pieOptions = {
animation: false,
}
if ($("#myChart").get(0)) {
var ctx = $("#myChart").get(0).getContext("2d");
var myNewChart = new Chart(ctx);
new Chart(ctx).Pie(data, pieOptions);
}
}
home is my template name

When you console log '$("#myChart").get(0)' this will return you undefined, because on rendered your get(0) is not initialized, For prevent this you have to add a callback when you initialized you chart. So your get(0) will be initialized first then you can create your chats.
'$("#myChart").get(0)' is not a reative thing so your view will be not re-initialized.
Here is the working code:
function drawChart() {
var oldCount = 2;
var newCount = 4;
var data = [{
value: newCount,
color: "#e53935",
highlight: "#c62828",
label: "New"
}, {
value: oldCount,
color: "#3949ab",
highlight: "#1a237e",
label: "Regular"
}];
var pieOptions = {
animation: false,
}
// Added a callback here.
setTimeout( function(){
if ($("#myChart").get(0)) {
var ctx = $("#myChart").get(0).getContext("2d");
var myNewChart = new Chart(ctx);
console.log(myNewChart);
new Chart(ctx).Pie(data, pieOptions);
}
})
}

Want to multiple charts on same page with different data

I am using a doughnut chart plugin in my website. It is working fine but I want multiple chart on same page with different data. Please see the code below.
This is the chart I am using
<canvas id="chart-area1" width="200" height="200" style="width:150px !important; height:150px !important;"/></canvas>
Script is here
<script src="http://www.chartjs.org/assets/Chart.min.js"></script>
<script>
var doughnutData = [
{
value: 45,
color:"#17CB8A",
highlight: "#17CB8C",
label: "Strating"
},
{
value: 12,
color: "#FF003C",
highlight: "#FF003A",
label: "Warning"
},
{
value: 7,
color: "#fb6800",
highlight: "#fb6801",
label: "Past Due"
},
{
value: 9,
color: "#88c100",
highlight: "#88c102",
label: "In Progress"
},
];
window.onload = function(){
var ctx = document.getElementById("chart-area1").getContext("2d");
window.myDoughnut = new Chart(ctx).Doughnut(doughnutData, {responsive : true});
};
</script>
How I can copy this chart with different attributes?

This is how i did it. with multiple canvases.
<script>
var doughnutData = [ ... ];
var doughnutData2 = [ ... ];
var doughnutData3 = [ ... ];
window.onload = function(){
var ctx = document.getElementById("chart-area1").getContext("2d");
var dtx = document.getElementById("chart-area2").getContext("2d");
var etx = document.getElementById("chart-area3").getContext("2d");
window.myDoughnut = new Chart(ctx).Doughnut(doughnutData, {responsive : true});
window.myDoughnut2 = new Chart(dtx).Doughnut(doughnutData2, {responsive : true});
window.myDoughnut3 = new Chart(etx).Doughnut(doughnutData3, {responsive : true});
};
</script>
If you want to use multiple Charts on same canvas you can use the fork FVANCOP did for Chart.js here

Highcharts reloading issue with Backbone.js

I'm struggling to solve a problem I have with getting a chart to be redrawn after navigating to another view and then return back to the same chart view.
I'm using Backbone.js and Underscore as a MVC and templating solution for my application.
When I navigate to the charting page initially it works great, but if I move away and then come back I get a `TypeError: chart.series[0] is undefined in the console log.
I have highlighted line where the error occurs in the code below, close to the end.
My thought is that I may need to destroy() the chart at some point, but I'm unsure where I would do this and if it would solve my problem.
I recently changed the script to now use HighStock 'Highstock JS v1.3.6 (2013-10-04)' from earlier HighCharts ver 2.3.5, where it appeared that I did not have this issue.
The app is live online if anyone really needs or wants to see it in action, let me know.
The following code section is the function thatis called by the Backbone router.
If there is a need for other sections of code, please let me know.
I'll be grateful for any advice.
EDIT:
I have managed to get this in JSFiddle for anyone to view the problem.
Clickty clack your fury tailless one here http://jsfiddle.net/rockwallaby/pqKWj
When you first run it up, you will get a trend being displayed.
Then hit the 'Go to a different page' link, you will get a fairly blank page.
On that page there is a link to bring you back to the trend page.
Hitting that link brings you back but the trend does not get rendered correctly due to the above mentioned error.
//=================================================================================
// trendsBattery
// A simple trend view showing Battery Volts and Solar Charge
//
window.trendsBattery = Backbone.View.extend({
trendModel: new TrendsModel(),
template: _.template(trendsTemplate),
chart: null,
chartoptions:{
chart: {
renderTo: 'chart-container',
},
rangeSelector: {
enabled: false,
},
title:{
text:'Battery Volts & Solar Amps'
},
xAxis: {
type:'datetime',
dateTimeLabelFormats: {month:'%e. %b',year:'%b'}
},
yAxis: [{
title :{text: 'Battery Volts'},
min: 22,
max: 32,
minorGridLineColor: '#E0E0E0',
},
{
title :{text: 'Solar Charge Amps'},
min: 0,
max: 16,
opposite: true,
},
],
series:[
{yAxis: 0, data: [], type: 'line', step: true, name: 'Battery Vdc'},
{yAxis: 1, data: [], type: 'line', step: true, name: 'Solar Amps'},
],
},
render:function() {
that = this;
$(this.el).html(this.template());
this.chartoptions.chart.width = (windowWidth);
this.chartoptions.chart.height = (windowHeight - 150);
setTimeout(function() {
chart = new Highcharts.StockChart(that.chartoptions);
chart.events ={load: that.requestData(this.chart) };
},20);
return this;
},
requestData: function(chart){
var querystring = '//myHostServer.com/myFolder/myPHP.php';
jQuery.get(querystring, null, function(csv, state, xhr) {
if (typeof csv !== 'string') {
csv = xhr.responseText;
};
csv = csv.split(/\n/g);
var vB_array = [];
var iS_array = [];
jQuery.each(csv, function (i, line) {
if (line.length > 1) {
line_array = line.split(',');
var date = parseInt(line_array[0]) * 1000;
var vBpoint = {};
var iSpoint = {};
vBpoint.x = date;
iSpoint.x = date;
vBpoint.y = parseFloat(line_array[1]);
iSpoint.y = parseFloat(line_array[4]);
vB_array.unshift(vBpoint);
iS_array.unshift(iSpoint);
};
});
chart.series[0].setData(vB_array, false); // <<<<< Problem Area
chart.series[1].setData(iS_array, false);
chart.redraw();
});
chart.xAxis[0].setExtremes(); // expand out the scrollbar when moving through time:
},
});

I just updated jsfiddle with the suggestion I provided in comment, it's working.
window.trendView = Backbone.View.extend({
trendModel: new TrendsModel(),
template: _.template(trendTemplate),
chart: null,
getChartOptions: function () {
return {
chart: {
animation: true,
renderTo: 'chart-container',
backgroundColor: '#fff'
},
rangeSelector: {
enabled: false
},
title: {
text: 'Battery Volts & Solar Amps'
},
xAxis: {
type: 'datetime',
dateTimeLabelFormats: {
month: '%e. %b',
year: '%b'
} // don't display the dummy year:
},
yAxis: [{
title: {
text: 'Battery Volts'
},
min: 22,
max: 32,
minorGridLineColor: '#E0E0E0'
}, {
title: {
text: 'Solar Charge Amps'
},
min: 0,
max: 16,
opposite: true
}],
series: [{
yAxis: 0,
data: [],
type: 'line',
step: true,
name: 'Battery Vdc'
}, {
yAxis: 1,
data: [],
type: 'line',
step: true,
name: 'Solar Amps'
}]
}
},
render: function () {
that = this;
$(this.el).html(this.template());
var chartOptions = that.getChartOptions();
chartOptions.chart.width = (windowWidth - 50);
chartOptions.chart.height = (windowHeight - 50);
setTimeout(function () {
chart = new Highcharts.StockChart(chartOptions);
chart.events = {
load: that.requestData(this.chart)
};
}, 20);
return this;
},
requestData: function (chart) {
var querystring = '//paulalting.com/hydrosolar/clientGET.php?id=trendVolts&start=6400&size=200';
console.log(querystring);
jQuery.get(querystring, null, function (csv, state, xhr) {
if (typeof csv !== 'string') {
csv = xhr.responseText;
}
csv = csv.split(/\n/g);
var vB_array = [];
var iS_array = [];
jQuery.each(csv, function (i, line) {
if (line.length > 1) {
line_array = line.split(',');
var date = parseInt(line_array[0], 10) * 1000;
var vBpoint = {};
var iSpoint = {};
vBpoint.x = date;
iSpoint.x = date;
vBpoint.y = parseFloat(line_array[1]);
iSpoint.y = parseFloat(line_array[4]);
vB_array.unshift(vBpoint);
iS_array.unshift(iSpoint);
}
});
chart.series[0].setData(vB_array, false); // <<<<< Problem Area
chart.series[1].setData(iS_array, false);
chart.redraw();
});
chart.xAxis[0].setExtremes(); // expand out the scrollbar when moving through time:
}
});
here is the link
http://jsfiddle.net/pqKWj/14/
If you are interested let me know I see some more similar problems in the code, which I think fine for now, but will create issues, when you have 2 charts in the same page etc. we can talk

How to update Highcharts data dynamically over a period of time

I want to use Highcharts graph and update y axis dynamically. Actually I want to update nsw, Tas, ACT every 5 sec. How do I do it ?
Here is my code.
$(function () {
$('#container').highcharts({
title: {
text: 'Histogram',
x: -20 // center
},
subtitle: {
text: 'Source: www.trove.com',
x: -20
},
xAxis: {
categories: ['NSW', 'Tas', 'ACT','QLD','VIC','SA','WA']
},
yAxis: {
title: {
text: 'Hits'
},
plotLines: [{
value: 0,
width: 1,
color: '#808080'
}]
},
tooltip: {
valueSuffix: '°C'
},
legend: {
layout: 'vertical',
align: 'right',
verticalAlign: 'middle',
borderWidth: 0
},
series: [{
name: 'States',
data: [nsw, Tas, ACT,qld,vic,sa,wa]
}]
});
});
});

In the Documentation you can find an example from Highcharts in jsfiddle. Check it out http://jsfiddle.net/gh/get/jquery/1.9.1/highslide-software/highcharts.com/tree/master/samples/highcharts/demo/dynamic-update/. In the example every second a new point will be added. Here comes the relevant code part:
chart: {
type: 'spline',
animation: Highcharts.svg, // don't animate in old IE
marginRight: 10,
events: {
load: function () {
// set up the updating of the chart each second
var series = this.series[0];
setInterval(function () {
var x = (new Date()).getTime(), // current time
y = Math.random();
series.addPoint([x, y], true, true);
}, 1000);
}
}
},
`

The easiest way to do it would be to use the javascript function "setInterval()" to call it.
Here is a link where you can find a way to do it :
http://www.w3schools.com/js/js_timing.asp
If you are not really good at javascript, you might need this declaration of functions : var functionName = function() {} vs function functionName() {}

Use:
events: {
load: function () {
// set up the updating of the chart each second
var series = this.series[0];
setInterval(function () {
var x = (new Date()).getTime(), // current time
y = Math.random(),
l = series.data.length;
for(var i = 0; i < l; i++) {
series.data[i].update({
y: getHits(i) // or something else
});
}
}, 5000); // 5 seconds
}
}
Where index is index (count from 0) of nsw/Tas/ACT in data array. (for nsw = 0, for Tas = 1 etc.)

Highcharts - column chart redraw animation

I'm trying to update an existing data series with a new data array and invoke the redraw function when done. While this works perfectly, I'm not quite satisfied as I'd like to have a sort of grow/shrink transition. I have seen an example by Highcharts (fiddle around with the existing data set then click on the button "Set new data to selected series") but I can't replicate this behavior.
This is what code that I've written:
var series, newSeriesThreshold = this.chart.series.length * 2;
for (var i = 0; i < data.length; i += 2) {
series = {
name: this.data[i].title,
data: this.data[i].data,
color: this.data[i].color
};
if (i >= newSeriesThreshold) {
this.chart.addSeries(series, false);
} else {
var currentSeries = this.chart.series[i / 2];
currentSeries.setData(series.data, false);
}
}
this.chart.redraw();
These are the options when creating the chart:
var config = {
chart: {
renderTo: $(this.container).attr('id'),
type: this.settings.type,
animation: {
duration: 500,
easing: 'swing'
}
},
title: {
text: null
},
legend: {
enabled: this.settings.legend.show
},
tooltip: {
formatter: function() {
return this.x.toFixed(0) + ": <b>" + this.y.toString().toCurrency(0) + '</b>';
}
},
xAxis: {
title: {
text: this.settings.xaxis.title,
style: {
color: '#666'
}
}
},
yAxis: {
title: {
text: this.settings.yaxis.title,
style: {
color: '#666'
}
}
},
series: series,
plotOptions: {
column: {
color: '#FF7400'
}
},
credits: {
enabled: false
}
};
This yields an immediate update without transitioning effects. Any ideas what I might be doing wrong?

I have solved this problem by destroying and creating again the chart.
Here is the link on highcharts forum that helps me : http://forum.highcharts.com/highcharts-usage/animation-on-redraw-t8636/#p93199
The answer comes from the highcharts support team.
$(document).ready(function() {
var chartOptions = {
// Your chart options
series: [
{name: 'Serie 1' , color: '#303AFF', data: [1,1,1,1,1,1,1}
]
};
var chart = new Highcharts.Chart(chartOptions);
$("#my_button").click(function(){
chart.destroy();
chartOptions.series[0].data = [10,5,2,10,5,2,10];
chart = new Highcharts.Chart(chartOptions);
});
});

This remain a mystery. I managed to make the axis update which suggests that there is some kind of animation going on, but it's applied only to the axis, and not the columns.
In the end, I've settled with this behavior.

This might help:
var mychart = $("#mychart").highcharts();
var height = mychart.renderTo.clientHeight;
var width = mychart.renderTo.clientWidth;
mychart.setSize(width, height);
to update all charts
$(Highcharts.charts).each(function(i,chart){
var height = chart.renderTo.clientHeight;
var width = chart.renderTo.clientWidth;
chart.setSize(width, height);
});