Google Charting API stop negative numbers from being displayed - google-visualization

I am working with Google's Charting API and I have a problem where the graph will sometimes have 0 in the middle of the y axis and underneath show negative numbers.
I want to set the chart to be a minimum of 0 and found on Google that all I need to do is add vAxis:{viewWindow: {min: 0}}.
I'm drawing my chart like the below
function (result)
{
alert(result);
var obj = $.parseJSON(result);
var resultData = obj.DATA;
var data = new google.visualization.DataTable(resultData);
var options = {
title: "Crash counts for ",
pointSize: 6,
hAxis: {showTextEvery: 2, slantedText: true, slantedTextAngle: 30},
animation: {
duration: 1000,
easing: 'out'
}
vAxis:{viewWindow: {min: 0}}
};
var chart = new google.visualization.LineChart(document.getElementById("lineChart"));
chart.draw(data, options);
}
), "json";
}
Chrome says that the line vAxis has an error which is unexpected identifier.


Well, really simple mistake, you just forgot to add a , after animation :
var options = {
title: "Crash counts for ",
pointSize: 6,
hAxis: {showTextEvery: 2, slantedText: true, slantedTextAngle: 30},
animation: {
duration: 1000,
easing: 'out'
}, // here is the change
vAxis:{viewWindow: {min: 0}}
};

Related

chart.js animate data through time? [duplicate]

I created an basic bar chart using chartjs and it works fine. Now I want to update the values on a time based interval. My problem is that after I created the chart, I do not know how to update its values correctly...
My code:
var ctx = $("#myChart").get(0).getContext("2d");
var dts = [
{
fillColor: "rgba(220,220,220,0.5)",
strokeColor: "rgba(220,220,220,1)",
data: [0, 0, 0, 0, 0]
}
];
var data = {
labels: ["Core#1", "Core#2", "Core#3", "Core#4", "Total"],
datasets: dts
};
var chart = new Chart(ctx);
chart.Bar(data);
//test code
setInterval( function () {
data.datasets[0].data = [random(), random(), random(), random(), random()];
chart.Bar(data);
},2000);
in the test code, I am updating the values with datasets[0].data- is this the right way to do it? The problem with this is that everytime I call chart.Bar(), the values are reset to 0 then animated to the random value (like I am recreating the chart). This way, all animations are always from 0 to value which looks strange. I would expect that if I update a value from 50 to 10 the bar would go down to 10 from 50 and not setted to 0 then animated to 10.
I did not found anything in the docs about this... am I doing something wrong or this is impossible with this library?

Update: Looks like chartjs has been updated (see comment below). There are some examples up that look very nice:
Here's an example of updating a line chart using new data: http://jsbin.com/yitep/5/edit
Here's how we can update existing data on a line chart: http://jsbin.com/yitep/4/edit
Original Post
As of Nov 2013, there seem to be very few options for updating charts.
There is a good example here (duplicated below) of adding new points to a line chart. Still kind of jumpy but not too bad. However, I think the effect probably depends on the chart you are using.
It does look like this is somewhere in the development pipeline. I don't see any indication of a release date yet though: https://github.com/nnnick/Chart.js/issues/13 [Closed as of Jul 26, 2014]
JS
$(document).ready(function(){
var count = 10;
var data = {
labels : ["1","2","3","4","5", "6", "7", "8", "9", "10"],
datasets : [
{
fillColor : "rgba(220,220,220,0.5)",
strokeColor : "rgba(220,220,220,1)",
pointColor : "rgba(220,220,220,1)",
pointStrokeColor : "#fff",
data : [65,59,90,81,56,45,30,20,3,37]
},
{
fillColor : "rgba(151,187,205,0.5)",
strokeColor : "rgba(151,187,205,1)",
pointColor : "rgba(151,187,205,1)",
pointStrokeColor : "#fff",
data : [28,48,40,19,96,87,66,97,92,85]
}
]
}
// this is ugly, don't judge me
var updateData = function(oldData){
var labels = oldData["labels"];
var dataSetA = oldData["datasets"][0]["data"];
var dataSetB = oldData["datasets"][1]["data"];
labels.shift();
count++;
labels.push(count.toString());
var newDataA = dataSetA[9] + (20 - Math.floor(Math.random() * (41)));
var newDataB = dataSetB[9] + (20 - Math.floor(Math.random() * (41)));
dataSetA.push(newDataA);
dataSetB.push(newDataB);
dataSetA.shift();
dataSetB.shift(); };
var optionsAnimation = {
//Boolean - If we want to override with a hard coded scale
scaleOverride : true,
//** Required if scaleOverride is true **
//Number - The number of steps in a hard coded scale
scaleSteps : 10,
//Number - The value jump in the hard coded scale
scaleStepWidth : 10,
//Number - The scale starting value
scaleStartValue : 0
}
// Not sure why the scaleOverride isn't working...
var optionsNoAnimation = {
animation : false,
//Boolean - If we want to override with a hard coded scale
scaleOverride : true,
//** Required if scaleOverride is true **
//Number - The number of steps in a hard coded scale
scaleSteps : 20,
//Number - The value jump in the hard coded scale
scaleStepWidth : 10,
//Number - The scale starting value
scaleStartValue : 0
}
//Get the context of the canvas element we want to select
var ctx = document.getElementById("myChart").getContext("2d");
var optionsNoAnimation = {animation : false}
var myNewChart = new Chart(ctx);
myNewChart.Line(data, optionsAnimation);
setInterval(function(){
updateData(data);
myNewChart.Line(data, optionsNoAnimation)
;}, 2000
);
});
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c.segmentStrokeWidth,b.strokeStyle=c.segmentStrokeColor,b.stroke());g+=l}},b)},J=function(a,c,b){for(var e=0,h=Math.min.apply(Math,[u/2,q/2])-5,f=h*(c.percentageInnerCutout/100),d=0;d<a.length;d++)e+=a[d].value;x(c,null,function(d){var k=-Math.PI/2,j=1,l=1;c.animation&&(c.animateScale&&(j=d),c.animateRotate&&(l=d));for(d=0;d<a.length;d++){var m=l*a[d].value/e*2*Math.PI;b.beginPath();b.arc(q/2,u/2,j*h,k,k+m,!1);b.arc(q/2,u/2,j*f,k+m,k,!0);b.closePath();b.fillStyle=a[d].color;b.fill();c.segmentShowStroke&&
(b.lineWidth=c.segmentStrokeWidth,b.strokeStyle=c.segmentStrokeColor,b.stroke());k+=m}},b)},K=function(a,c,b){var e,h,f,d,g,k,j,l,m,t,r,n,p,s=0;g=u;b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;t=1;for(d=0;d<a.labels.length;d++)e=b.measureText(a.labels[d]).width,t=e>t?e:t;q/a.labels.length<t?(s=45,q/a.labels.length<Math.cos(s)*t?(s=90,g-=t):g-=Math.sin(s)*t):g-=c.scaleFontSize;d=c.scaleFontSize;g=g-5-d;e=Number.MIN_VALUE;h=Number.MAX_VALUE;for(f=0;f<a.datasets.length;f++)for(l=
0;l<a.datasets[f].data.length;l++)a.datasets[f].data[l]>e&&(e=a.datasets[f].data[l]),a.datasets[f].data[l]<h&&(h=a.datasets[f].data[l]);f=Math.floor(g/(0.66*d));d=Math.floor(0.5*(g/d));l=c.scaleShowLabels?c.scaleLabel:"";c.scaleOverride?(j={steps:c.scaleSteps,stepValue:c.scaleStepWidth,graphMin:c.scaleStartValue,labels:[]},z(l,j.labels,j.steps,c.scaleStartValue,c.scaleStepWidth)):j=C(g,f,d,e,h,l);k=Math.floor(g/j.steps);d=1;if(c.scaleShowLabels){b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;
for(e=0;e<j.labels.length;e++)h=b.measureText(j.labels[e]).width,d=h>d?h:d;d+=10}r=q-d-t;m=Math.floor(r/(a.labels.length-1));n=q-t/2-r;p=g+c.scaleFontSize/2;x(c,function(){b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(q-t/2+5,p);b.lineTo(q-t/2-r-5,p);b.stroke();0<s?(b.save(),b.textAlign="right"):b.textAlign="center";b.fillStyle=c.scaleFontColor;for(var d=0;d<a.labels.length;d++)b.save(),0<s?(b.translate(n+d*m,p+c.scaleFontSize),b.rotate(-(s*(Math.PI/180))),b.fillText(a.labels[d],
0,0),b.restore()):b.fillText(a.labels[d],n+d*m,p+c.scaleFontSize+3),b.beginPath(),b.moveTo(n+d*m,p+3),c.scaleShowGridLines&&0<d?(b.lineWidth=c.scaleGridLineWidth,b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+d*m,5)):b.lineTo(n+d*m,p+3),b.stroke();b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(n,p+5);b.lineTo(n,5);b.stroke();b.textAlign="right";b.textBaseline="middle";for(d=0;d<j.steps;d++)b.beginPath(),b.moveTo(n-3,p-(d+1)*k),c.scaleShowGridLines?(b.lineWidth=c.scaleGridLineWidth,
b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+r+5,p-(d+1)*k)):b.lineTo(n-0.5,p-(d+1)*k),b.stroke(),c.scaleShowLabels&&b.fillText(j.labels[d],n-8,p-(d+1)*k)},function(d){function e(b,c){return p-d*v(a.datasets[b].data[c],j,k)}for(var f=0;f<a.datasets.length;f++){b.strokeStyle=a.datasets[f].strokeColor;b.lineWidth=c.datasetStrokeWidth;b.beginPath();b.moveTo(n,p-d*v(a.datasets[f].data[0],j,k));for(var g=1;g<a.datasets[f].data.length;g++)c.bezierCurve?b.bezierCurveTo(n+m*(g-0.5),e(f,g-1),n+m*(g-0.5),
e(f,g),n+m*g,e(f,g)):b.lineTo(n+m*g,e(f,g));b.stroke();c.datasetFill?(b.lineTo(n+m*(a.datasets[f].data.length-1),p),b.lineTo(n,p),b.closePath(),b.fillStyle=a.datasets[f].fillColor,b.fill()):b.closePath();if(c.pointDot){b.fillStyle=a.datasets[f].pointColor;b.strokeStyle=a.datasets[f].pointStrokeColor;b.lineWidth=c.pointDotStrokeWidth;for(g=0;g<a.datasets[f].data.length;g++)b.beginPath(),b.arc(n+m*g,p-d*v(a.datasets[f].data[g],j,k),c.pointDotRadius,0,2*Math.PI,!0),b.fill(),b.stroke()}}},b)},L=function(a,
c,b){var e,h,f,d,g,k,j,l,m,t,r,n,p,s,w=0;g=u;b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;t=1;for(d=0;d<a.labels.length;d++)e=b.measureText(a.labels[d]).width,t=e>t?e:t;q/a.labels.length<t?(w=45,q/a.labels.length<Math.cos(w)*t?(w=90,g-=t):g-=Math.sin(w)*t):g-=c.scaleFontSize;d=c.scaleFontSize;g=g-5-d;e=Number.MIN_VALUE;h=Number.MAX_VALUE;for(f=0;f<a.datasets.length;f++)for(l=0;l<a.datasets[f].data.length;l++)a.datasets[f].data[l]>e&&(e=a.datasets[f].data[l]),a.datasets[f].data[l]<
h&&(h=a.datasets[f].data[l]);f=Math.floor(g/(0.66*d));d=Math.floor(0.5*(g/d));l=c.scaleShowLabels?c.scaleLabel:"";c.scaleOverride?(j={steps:c.scaleSteps,stepValue:c.scaleStepWidth,graphMin:c.scaleStartValue,labels:[]},z(l,j.labels,j.steps,c.scaleStartValue,c.scaleStepWidth)):j=C(g,f,d,e,h,l);k=Math.floor(g/j.steps);d=1;if(c.scaleShowLabels){b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;for(e=0;e<j.labels.length;e++)h=b.measureText(j.labels[e]).width,d=h>d?h:d;d+=10}r=q-d-t;m=
Math.floor(r/a.labels.length);s=(m-2*c.scaleGridLineWidth-2*c.barValueSpacing-(c.barDatasetSpacing*a.datasets.length-1)-(c.barStrokeWidth/2*a.datasets.length-1))/a.datasets.length;n=q-t/2-r;p=g+c.scaleFontSize/2;x(c,function(){b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(q-t/2+5,p);b.lineTo(q-t/2-r-5,p);b.stroke();0<w?(b.save(),b.textAlign="right"):b.textAlign="center";b.fillStyle=c.scaleFontColor;for(var d=0;d<a.labels.length;d++)b.save(),0<w?(b.translate(n+
d*m,p+c.scaleFontSize),b.rotate(-(w*(Math.PI/180))),b.fillText(a.labels[d],0,0),b.restore()):b.fillText(a.labels[d],n+d*m+m/2,p+c.scaleFontSize+3),b.beginPath(),b.moveTo(n+(d+1)*m,p+3),b.lineWidth=c.scaleGridLineWidth,b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+(d+1)*m,5),b.stroke();b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(n,p+5);b.lineTo(n,5);b.stroke();b.textAlign="right";b.textBaseline="middle";for(d=0;d<j.steps;d++)b.beginPath(),b.moveTo(n-3,p-(d+1)*
k),c.scaleShowGridLines?(b.lineWidth=c.scaleGridLineWidth,b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+r+5,p-(d+1)*k)):b.lineTo(n-0.5,p-(d+1)*k),b.stroke(),c.scaleShowLabels&&b.fillText(j.labels[d],n-8,p-(d+1)*k)},function(d){b.lineWidth=c.barStrokeWidth;for(var e=0;e<a.datasets.length;e++){b.fillStyle=a.datasets[e].fillColor;b.strokeStyle=a.datasets[e].strokeColor;for(var f=0;f<a.datasets[e].data.length;f++){var g=n+c.barValueSpacing+m*f+s*e+c.barDatasetSpacing*e+c.barStrokeWidth*e;b.beginPath();
b.moveTo(g,p);b.lineTo(g,p-d*v(a.datasets[e].data[f],j,k)+c.barStrokeWidth/2);b.lineTo(g+s,p-d*v(a.datasets[e].data[f],j,k)+c.barStrokeWidth/2);b.lineTo(g+s,p);c.barShowStroke&&b.stroke();b.closePath();b.fill()}}},b)},D=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){window.setTimeout(a,1E3/60)},F={}};
HTML
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
</head>
<body>
<h1>Live Updating Chart.js</h1>
<canvas id="myChart" width="400" height="150"></canvas>
</body>
</html>

The update() triggers an update of the chart.
chart.update( )
.update(config)
Triggers an update of the chart. This can be safely called after updating the data object. This will update all scales, legends, and then re-render the chart. A config object can be provided with additional configuration for the update process.
update() can be safely called after updating values of one or more existing points within the the data object, rendering the changes in one animated render loop.
// update the first dataset's value of 'March' to be 50
myBarChart.data.datasets[0].bars[2].value = 50;
// animate update of 'March' from 90 to 50.
myBarChart.update();

Here is how to do it in the last version of ChartJs:
setInterval(function(){
chart.data.datasets[0].data[5] = 80;
chart.data.labels[5] = "Newly Added";
chart.update();
}
Look at this clear video
or test it in jsfiddle

You also can use destroy() function. Like this
if( window.myBar!==undefined)
window.myBar.destroy();
var ctx = document.getElementById("canvas").getContext("2d");
window.myBar = new Chart(ctx).Bar(barChartData, {
responsive : true,
});

You just need to change the chartObject.data.datasets value and call update() like this:
chartObject.data.datasets = newData.datasets;
chartObject.data.labels = newData.labels;
chartObject.update();

Remove the canvas dom and add in again.
function renderChart(label,data){
$("#canvas-wrapper").html("").html('<canvas id="storeSends"></canvas>');
var lineChartData = {
labels : label,
datasets : [
{
fillColor : "rgba(49, 195, 166, 0.2)",
strokeColor : "rgba(49, 195, 166, 1)",
pointColor : "rgba(49, 195, 166, 1)",
pointStrokeColor : "#fff",
data : data
}
]
}
var canvas = document.getElementById("storeSends");
var ctx = canvas.getContext("2d");
myLine = new Chart(ctx).Line(lineChartData, {
responsive: true,
maintainAspectRatio: false
});
}

I think the easiest way is to write a function to update your chart including the chart.update()method. Check out this simple example I wrote in jsfiddle for a Bar Chart.
//value for x-axis
var emotions = ["calm", "happy", "angry", "disgust"];
//colours for each bar
var colouarray = ['red', 'green', 'yellow', 'blue'];
//Let's initialData[] be the initial data set
var initialData = [0.1, 0.4, 0.3, 0.6];
//Let's updatedDataSet[] be the array to hold the upadted data set with every update call
var updatedDataSet;
/*Creating the bar chart*/
var ctx = document.getElementById("barChart");
var barChart = new Chart(ctx, {
type: 'bar',
data: {
labels: emotions,
datasets: [{
backgroundColor: colouarray,
label: 'Prediction',
data: initialData
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true,
min: 0,
max: 1,
stepSize: 0.5,
}
}]
}
}
});
/*Function to update the bar chart*/
function updateBarGraph(chart, label, color, data) {
chart.data.datasets.pop();
chart.data.datasets.push({
label: label,
backgroundColor: color,
data: data
});
chart.update();
}
/*Updating the bar chart with updated data in every second. */
setInterval(function() {
updatedDataSet = [Math.random(), Math.random(), Math.random(), Math.random()];
updateBarGraph(barChart, 'Prediction', colouarray, updatedDataSet);
}, 1000);
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.min.js"></script>
<body>
<div>
<h1>Update Bar Chart</h1>
<canvas id="barChart" width="800" height="450"></canvas>
</div>
<script src="barchart.js"></script>
</body>
</head>
</html>
Hope this helps.

If destroy() and clear() is not working (just like what i had experience) you can use jquery to remove the canvas and append it again.
$('#chartAmazon').remove();
$('#chartBar').append('<canvas id="chartAmazon"></canvas>');
var ctxAmazon = $("#chartAmazon").get(0).getContext("2d");
var AmazonChart = new Chart(ctxAmazon, {
type: 'doughnut',
data: dataAmazon,
options: optionsA
});

I don't think it's possible right now.
However that's a feature which should come soon, as the author hinted here:
https://github.com/nnnick/Chart.js/issues/161#issuecomment-20487775

This is an example with ChartJs - 2.9.4
var maximumPoints = 5;// with this variable you can decide how many points are display on the chart
function addData(chart, label, data) {
chart.data.labels.push(label);
chart.data.datasets.forEach((dataset) => {
var d = data[0];
dataset.data.push(d);
data.shift();
});
var canRemoveData = false;
chart.data.datasets.forEach((dataset) => {
if (dataset.data.length > maximumPoints) {
if (!canRemoveData) {
canRemoveData = true;
chart.data.labels.shift();
}
dataset.data.shift();
}
});
chart.update();
}
window.onload = function () {
var canvas = document.getElementById('elm-chart'),
ctx = canvas.getContext('2d');
var myLineChart = new Chart(ctx, {
type: 'line',
data: {
labels: [],
datasets: [
{
data: [],
label: 'Dataset-1',
backgroundColor: "#36a2eb88",
borderColor: "#36a2eb",
},
{
data: [],
label: 'Dataset-2',
backgroundColor: "#ff638488",
borderColor: "#ff6384",
}
],
},
options: {
responsive: false,
maintainAspectRatio: false,
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
var index = 0;
setInterval(function () {
var data = [];
myLineChart.data.datasets.forEach((dataset) => {
data.push(Math.random() * 100);
});
addData(myLineChart, index, data);
index++;
}, 1000);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>
<canvas id="elm-chart" width="640" height="480"></canvas>

There are 2 ways to solve it:
chart.update()
Delete existing chart using chart.destroy() and create new chart object.

The simplest way is to replace the canvas element and then call new Chart() again:
function reloadMyChart() {
$('myChart').replaceWith('<canvas id="myChart"></canvas>');
new Chart(document.getElementById("myChart"), {
data: yourChartData,
type: yourChartType,
options: yourChartOptions
});
}
Of course, you must replace yourChartData, yourChartType and yourChartOptions with the correct values required to initialize Chart.js. See Chart.js Docs.
You can call reloadMyChart function on a button click or any other event you need. Probably you'll add parameters to this function and use these to make a REST call to dynamically update your chart, like this:
function reloadMyChart(param1, param2) {
$('myChart').replaceWith('<canvas id="myChart"></canvas>');
$.get("restUrl?param1=" + param1 + "&param2=" + param2 + ",
function(data) {
// call new Chart() here and use returned data
}
);
Hope it helps! =)

Showing realtime update chartJS
function add_data(chart, label, data)
{
var today = new Date();
var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
myLineChart.data.datasets[0].data.push(Math.random() * 100);
myLineChart.data.datasets[1].data.push(Math.random() * 100);
myLineChart.data.labels.push(time)
myLineChart.update();
}
setInterval(add_data, 10000); //milisecond
full code , you can download in description link

As of 2022 and using ChartJS v3.7.1 you can use the code below.
Note that it is based on the JSBin snippets in doub1ejack's answer but these were not up to date and wouldn't work with the latest ChartJS version, mainly because the path to charts' data changed (now being yourChart._metasets[0]._dataset.data).
var canvas = document.getElementById('updating-chart'),
ctx = canvas.getContext('2d'),
startingData = {
labels: [1, 2, 3, 4, 5, 6, 7],
datasets: [
{
fillColor: "rgba(220,220,220,0.2)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(220,220,220,1)",
pointStrokeColor: "#fff",
data: [65, 59, 80, 81, 56, 55, 40]
},
{
fillColor: "rgba(151,187,205,0.2)",
strokeColor: "rgba(151,187,205,1)",
pointColor: "rgba(151,187,205,1)",
pointStrokeColor: "#fff",
data: [28, 48, 40, 19, 86, 27, 90]
}
]
};
// Reduce the animation steps for demo clarity.
const myLiveChart = new Chart(ctx, {
type: 'bar',
data: startingData,
options: {
scales: {
y: {
beginAtZero: true
}
},
maintainAspectRatio: false,
}
});
setInterval(function(){
// Get a random index point
var indexToUpdate = Math.round(Math.random() * startingData.labels.length);
// Update one of the points in the second dataset
myLiveChart._metasets[0]._dataset.data[indexToUpdate] = Math.random() * 100;
myLiveChart.update();
}, 5000);
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Updating chart example</title>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
</head>
<body>
<canvas id="updating-chart" width="500" height="300"></canvas>
</body>
</html>

You can check instance of Chart by using Chart.instances.
This will give you all the charts instances.
Now you can iterate on that instances and and change the data, which is present inside config.
suppose you have only one chart in your page.
for (var _chartjsindex in Chart.instances) {
/*
* Here in the config your actual data and options which you have given at the
time of creating chart so no need for changing option only you can change data
*/
Chart.instances[_chartjsindex].config.data = [];
// here you can give add your data
Chart.instances[_chartjsindex].update();
// update will rewrite your whole chart with new value
}

My solve was to actually store the charts outside of the state of Vue. Store the charts in a const variable in like a utility.js file. Then I was able to simply do this:
const PVR_CANVASES = {}
//This was my vue method for building the charts
build_metrics() {
this.votingResults.metrics.forEach(metric => {
const el = document.getElementById(metric.metric_data.canvas);
const n_chart = new Chart(el, {
type: 'line',
data: metric.chart.data,
options: {
responsive: true,
maintainAspectRatio: true,
layout: {
autoPadding: false
},
plugins: {
legend: {
display: false,
}
},
scales: {
x: {
display: false
},
y: {
display: false
}
},
elements: {
line: {
tension: 0.4
},
point: {
backgroundColor: 'rgba(0, 0, 0, 0.1)'
}
}
}
});
PVR_CANVASES[metric.chart.id] = n_chart;
})
}
//UPDATE CHART IS THIS SIMPLE
this.votingResults.metrics.forEach(metric => {
const n_chart = PVR_CANVASES[metric.chart.id];
n_chart.data = metric.chart.data;
n_chart.update();
});

So simple, Just replace the chart canvas element.
$('#canvas').replaceWith(' id="canvas" height="200px"
width="368px">');

I am not able to remove legend in this google chart, also not able to change height , I putted it inside a col-md-4 div , also there help me

js code :
its to add chart to col-4 bar must have 3 columns each having space between it all different color, remove legend in this google chart
function drawBarChart() {
var data = google.visualization.arrayToDataTable([
["Retention", "Level", {
role: "style"
}],
["HIGH", 12, "#E54B4B"],
["ELEVATED", 29, "#FFB100"],
["LOW", 52, "#2BC18D"],
]);
var options = {
title: "Density of Precious Metals, in g/cm^3",
height: 600,
width: 370,
legend: 'none',
bar: {
groupWidth: "55%"
},
ticks: [0, 20, 40, 60, 80, 100],
};
var chart = new google.visualization.ColumnChart(document.getElementById('chart_divTwo'));
// Convert the Classic options to Material options.
chart.draw(data, google.charts.Bar.convertOptions(data, options));
};

How to select context or scale on chart in chartjs quickchart io to run getValueForPixel?

I am trying to run a function to create gradient line on my chart like:
y.getValueForPixel(50),
and for that I need chart pixel for a certain value, but I can't figure out to select it on quickchart, as context is undefined there.
On the front end I am doing it like this:
borderColor: function(context, options) { // context is automatically fetched here from chart
let chart = context.chart;
let {
ctx,
chartArea
} = chart;
if (!chartArea) {
return null;
}
return getGradient(ctx, chartArea, chart);
}
getGradient function (for frontend):
function getGradient(ctx, chartArea, chart) {
let chartWidth = chartArea.right - chartArea.left;
let chartHeight = chartArea.bottom - chartArea.top;
if (gradient === null || width !== chartWidth || height !== chartHeight) {
width = chartWidth;
height = chartHeight;
let {
scales: {
x,
y
}
} = chart;
gradient = ctx.createLinearGradient(0, chartArea.top, 0, chartArea.bottom);
gradient.addColorStop(0, 'green');
gradient.addColorStop(y.getPixelForValue(50) / y.getPixelForValue(100), 'yellow')
}
return gradient;
}`;
But I can't figure out how to select context on quickchart io, any help would be great.

The full chart context is unavailable in the Community version of QuickChart at this time for security reasons. You'll either have to upgrade to Professional or self-host the service.
However, there is a built-in function getGradientFillHelper that wraps some of this access and may achieve the desired effect.
Here's an exmaple:
{
type: 'line',
data: {
labels: [2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020],
datasets: [
{
data: [12, 6, 5, 18, 12, 20, 50, 80, 90],
fill: false,
borderColor: getGradientFillHelper('vertical', [
'#eb3639',
'#a336eb',
'#36a2eb',
]),
borderWidth: 5,
pointRadius: 0,
},
],
},
options: {
legend: {
display: false,
},
},
}
Link to this chart in Quickchart editor
getGradientFillHelper documentation

Google Chart bars half the correct height in wkhtmltopdf

My Google Chart works perfectly in the browser:
Works perfectly
However, when I try to render this as a PDF using:
wkhtmltopdf --javascript-delay 2000 --print-media-type chart_dummy.html chart_dummy.pdf
the heights of the bars get halved, and the colour code goes missing:
Rendered PDF with bars half height
I take it there must be some wkhtmltopdf option to correct this, but I can't for the life of me identify one.
I'm using Ubuntu 16.04.7 LTS (Xenial Xerus), and wkhtmltopdf 0.12.5 (with patched qt).
My visualization function is
function drawVisualization() {// Create the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'focus name');
data.addColumn('number', 'Exceeded');
data.addColumn('number', 'Achieved');
data.addColumn('number', 'Not Achieved');
data.addColumn('number', 'Regressed');
var width = $($('.container-fluid')[0]).width();
var height = $($('.container-fluid')[0]).height();
var options = {
'width': width,
'height': height,
'chartArea': {top:10},
title: String(),
vAxis: {
title: '% Progress',
minValue: 0,
maxValue: 100,
format: '#\'%\'',
baseline: 0,
},
hAxis: {
title: ''
},
seriesType: 'bars',
series: {
5: {
type: 'line'
}
},
colors: ['#ffe400', '#03ea74', '#ffa000', '#0095ff'],
annotations: {
alwaysOutside: true,
textStyle: {
fontSize: 20,
auraColor: '#eee',
color: '#eee'
}
},
animation: {
duration: 2000,
easing: 'linear',
startup: true
},
legend: 'bottom'
};
reportData = {
"combined": {
"exceeded": "34",
"achieved": "72",
"not_achieved": "14",
"regressed": "8"
}
};
data.addRows([
['All Focus Areas', Number(reportData['combined']['exceeded']), Number(reportData['combined']['achieved']), Number(reportData['combined']['not_achieved']), Number(reportData['combined']['regressed'])]
]);
var chart = new google.visualization.ComboChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
Has anyone a clue how to make the PDF the same as the Browser rendering?

How to change color of annotation text in google-charts

How do you change the color of an annotation text in Google Chart Tools LineChart ?
Here is an example
google.load('visualization', '1', {packages: ['corechart']});
google.setOnLoadCallback(drawChart);
function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('number', 'Sales');
data.addColumn({id: 'title', label: 'Title', type: 'string', role: 'annotation'});
data.addRows([
[new Date(2012, 3, 5), 80, null],
[new Date(2012, 3, 12), 120, 'New Product'],
[new Date(2012, 3, 19), 80, null],
[new Date(2012, 3, 26), 65, null],
[new Date(2012, 4, 2), 70, null],
]);
var options = {
title: 'Sales by Week',
displayAnnotations: true,
hAxis: {title: 'Date',
titleTextStyle: {color: 'grey'}},
colors: ['#f07f09']
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
I want the line to be orange and the annotation text in grey. Currently the annotation text is orange.

No need for extra style data column and plumbing code to fill it for every row with ugly (and even incomplete above) formatting string. Only resort to separate styling column if you want to have different annotation color for the different data points.
There's a global setting, search for annotations.textStyle in https://developers.google.com/chart/interactive/docs/gallery/linechart
var options = {
annotations: {
textStyle: {
fontName: 'Times-Roman',
fontSize: 18,
bold: true,
italic: true,
// The color of the text.
color: '#871b47',
// The color of the text outline.
auraColor: '#d799ae',
// The transparency of the text.
opacity: 0.8
}
}
};
Here is a concept code for your case (notice different initialization google.charts, very important):
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
google.charts.load('current', { 'packages': ['corechart', 'line', 'bar'] });
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('number', 'Sales');
data.addColumn({id: 'title', label: 'Title', type: 'string', role: 'annotation'});
data.addRows([
[new Date(2012, 3, 5), 80, null],
[new Date(2012, 3, 12), 120, 'New Product'],
[new Date(2012, 3, 19), 80, null],
[new Date(2012, 3, 26), 65, null],
[new Date(2012, 4, 2), 70, null],
]);
var options = {
chart: {
title: 'Sales by Week'
},
hAxis: {
title: 'Date',
titleTextStyle: {color: 'grey'}
},
annotations: {
textStyle: {
color: 'grey',
}
}
colors: ['#f07f09']
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
You can also change other text formatting of the annotation, like bold, italic, font type, etc. Here is an example where most of the text is configured to be bold:
var options = {
chart: {
title: title
},
hAxis: {
textStyle: {
bold: true
}
},
vAxis: {
format: 'decimal',
textStyle: {
bold: true
}
},
legendTextStyle: {
bold: true
},
titleTextStyle: {
bold: true
},
width: chart_width,
//theme: 'material', // material theme decreases the color contrast and sets the black color items (all text) to 171,171,171 grey -> washed out
annotations: {
alwaysOutside: true,
highContrast: true, // default is true, but be sure
textStyle: {
bold: true
}
}
};
More examples with source repo link: https://mrcsabatoth.github.io/GoogleChartsTalk/

Actually you can. Color of the annotations is the same as line color. Just put a dot in the place you want to make an annotation and set a dot's color to the desirable annotation color.
data.addColumn({type: 'string', role: 'style'});
data.addColumn({type:'string', role:'annotation'});
and then when you add data
'point { size: 14; shape-type: circle; fill-color: #63A74A','Your annotation'
See example at
http://www.marketvolume.com/stocks/stochasticsmomentumindex.asp?s=SPY&t=spdr-s-p-500

If your annotations are not "touching", ie. the points you'd like to annotate are not next to each other, you could add a second line and add the annotations to that line.
In the JSON example below I have a date and a "total balance", as well as an "Ann" line.
"cols":[
{
"id":"date",
"label":"date",
"type":"date",
"p":{
"role":"domain"
}
},
{
"id":"total-balance",
"label":"Total balance",
"type":"number",
"p":{
"role":"data"
}
},
{
"id":"ann",
"label":"Ann",
"type":"number",
"p":{
"role":"data"
}
},
{
"type":"string",
"p":{
"role":"annotation"
}
},
{
"type":"string",
"p":{
"role":"annotationText"
}
}
],
The annotation comes after the "Ann" column so it'll be added to the "Ann" data points.
In my JSON, the date and "total-balance" are always filled in. "Ann" and the annotations are usually empty:
"rows":[
{
"c":[
{
"v":"Date(2013, 0, 1)"
},
{
"v":1000
},
{
"v":null
},
{
"v":null
},
{
"v":null
}
]
},
{
"c":[
{
"v":"Date(2013, 0, 8)"
},
{
"v":1001
},
{
"v":null
},
{
"v":null
},
{
"v":null
}
]
},
When I need an annotation, the "Ann" cell gets the same value as the total balance, and the annotation is added:
{
"c":[
{
"v":"Date(2013, 1, 26)"
},
{
"v":2000
},
{
"v":2000
},
{
"v":"Something!"
},
{
"v":"Something happened here!"
}
]
},
In your GChart's configuration, you can now set two colours. One for the normal line, and one for the "Ann".
colors: ['black','red']
If you have no annotations "touching", GCharts will not draw a line between them and the points will remain "invisible", while the annotations show up at exactly the right place.

Short answer: no, you can't change the text color through standard options (you could write something to find that text in the SVG and change its color with javascript, but that is beyond my level).
You can see an answer from ASGallant on Google Groups here, and his example here.
// code borrowed from Google visualization API playground, slightly modified here
google.load('visualization', '1', {packages: ['corechart']});
google.setOnLoadCallback(drawVisualization);
function drawVisualization() {
// Create and populate the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'x');
data.addColumn({type: 'string', role: 'annotation'});
data.addColumn({type: 'string', role: 'annotationText'});
data.addColumn('number', 'Cats');
data.addColumn('number', 'Blanket 1');
data.addColumn('number', 'Blanket 2');
data.addRow(["A", null, null, 1, 1, 0.5]);
data.addRow(["B", null, null, 2, 0.5, 1]);
data.addRow(["C", null, null, 4, 1, 0.5]);
data.addRow(["D", null, null, 8, 0.5, 1]);
data.addRow(["E", 'foo', 'foo text', 7, 1, 0.5]);
data.addRow(["F", null, null, 7, 0.5, 1]);
data.addRow(["G", null, null, 8, 1, 0.5]);
data.addRow(["H", null, null, 4, 0.5, 1]);
data.addRow(["I", null, null, 2, 1, 0.5]);
data.addRow(["J", null, null, 3.5, 0.5, 1]);
data.addRow(["K", null, null, 3, 1, 0.5]);
data.addRow(["L", null, null, 3.5, 0.5, 1]);
data.addRow(["M", null, null, 1, 1, 0.5]);
data.addRow(["N", null, null, 1, 0.5, 1]);
// Create and draw the visualization.
var chart = new google.visualization.LineChart(document.getElementById('visualization'));
chart.draw(data, {
annotation: {
1: {
style: 'line'
}
},
curveType: "function",
width: 500,
height: 400,
vAxis: {
maxValue: 10
}
});
}
The best you can do is to change the style of the line, but it doesn't look like you can currently change the color of the line.

Has this been updated using the 'style' option where one could add a new column {"type":"string","role":"style"} and in each row we would have {"v":"point {size: 4; fill-color: #3366cc;}"}? This allows the annotation to have the same color as the point/marker (which could be changed for each point) but does not allow it to be bold. One example of the data to try would be,
var data =new google.visualization.DataTable(
{
"cols":[
{"label":"Log GDP Per-Capita ","type":"number"},
{"label":"New Chart",
"type":"number"},
{"type":"string","role":"annotation"},
{"type":"string","role":"style"}
],
"rows":[
{"c":[{"v":10.21932},{"v":12.3199676},{"v":"ABW"},{"v":"point {size: 4; fill-color: #3366cc;}"}]},
{"c":[{"v":10.68416},{"v":8.4347518},{"v":"ARE"},{"v":"point {size: 4; fill-color: #3366cc;}"}]},
{"c":[{"v":9.634226},{"v":12.0774068},{"v":"ATG"},{"v":"point {size: 4; fill-color: #3366cc;}"}]},
{"c":[{"v":10.83869},{"v":1.8545959},{"v":"AUS"},{"v":"point {size: 4; fill-color: #3366cc;}"}]},
{"c":[{"v":10.7687},{"v":7.4919999},{"v":"AUT"},{"v":"point {size: 4; fill-color: #3366cc;}"}]}
]
}
);