I have created a js constructor function to create a D3 chart object.
The function appears to work on initial load. However,I have also added an onresize listener to re-draw the chart on resize.
However, when the resize event occurs, a console.log() of the data used to make the chart shows that the dates field (the first field) is all null. I have not been successful in using console.log to find where this change actually occurs. The data seems normal before the resize and before the chart drawing function runs.
Here is a jsfiddle, which as the full code. When you resize the viewport, the chart disappears. console shows myData is null
Relevant code:
HTML
var firstChart = new LineChart(myData,'chart-container','chart_area','This Is A Chart',["red","yellow","blue"],"temp","date")
//Re draw on resize
window.onresize = function(){
firstChart.drawChart();
console.log(myData);
}
DATA
var myData = [
{"date":20111001,"New_York":63.4,"San_Francisco":62.7,"Austin":72.2},
{"date":20111002,"New_York":58,"San_Francisco":59.9,"Austin":67.7},
{"date":20111003,"New_York":53.3,"San_Francisco":59.1,"Austin":69.4},
{"date":20111004,"New_York":55.7,"San_Francisco":58.8,"Austin":68},
{"date":20111005,"New_York":64.2,"San_Francisco":58.7,"Austin":72.4},
{"date":20111006,"New_York":58.8,"San_Francisco":57,"Austin":77},
{"date":20111007,"New_York":57.9,"San_Francisco":56.7,"Austin":82.3},
{"date":20111008,"New_York":61.8,"San_Francisco":56.8,"Austin":78.9},
{"date":20111009,"New_York":69.3,"San_Francisco":56.7,"Austin":68.8},
{"date":20111010,"New_York":71.2,"San_Francisco":60.1,"Austin":68.7},
{"date":20111011,"New_York":68.7,"San_Francisco":61.1,"Austin":70.3},
{"date":20111012,"New_York":61.8,"San_Francisco":61.5,"Austin":75.3},
{"date":20111013,"New_York":63,"San_Francisco":64.3,"Austin":76.6},
{"date":20111014,"New_York":66.9,"San_Francisco":67.1,"Austin":66.6},
{"date":20111015,"New_York":61.7,"San_Francisco":64.6,"Austin":68},
{"date":20111016,"New_York":61.8,"San_Francisco":61.6,"Austin":70.6},
{"date":20111017,"New_York":62.8,"San_Francisco":61.1,"Austin":71.1},
{"date":20111018,"New_York":60.8,"San_Francisco":59.2,"Austin":70},
{"date":20111019,"New_York":62.1,"San_Francisco":58.9,"Austin":61.6},
{"date":20111020,"New_York":65.1,"San_Francisco":57.2,"Austin":57.4},
{"date":20111021,"New_York":55.6,"San_Francisco":56.4,"Austin":64.3}
]
On resize the date column is all null
JS
function LineChart(data,chartContainerID,chartAreaId,chartTitle,colorArray,yaxisLabel,xaxisLabel,legend,yaxisFormat, marginsDict){
this.data = data;
this.chartContainer = document.getElementById(chartContainerID)
this.chartArea = document.getElementById(chartAreaId);
this.chartTitle = chartTitle;
this.colors = colorArray;
this.yaxisLabel=yaxisLabel;
this.xaxisLabel=xaxisLabel;
this.isLegend = legend;
this.yaxisFormat= yaxisFormat;
this.margins = marginsDict;
///....more code here in js fiddle.....
this.drawChart = function(){
///....more code here in js fiddle.....
///Console leads me here. more code above it
var items = color.domain().map(function(name) {
return {
name: name,
values: data.map(function(d) {
console.log(d)
return {
date: d.date,
result: +d[name]
};
})
};
});
///....more code here in js fiddle.....
}
}
I am trying to create a list of example shapes which will be shown when any shapes in canvas is clicked. How do i create this in mxgraph.
i tried using popup menu in mxgraph and tried adding shapes to it.But i am unable to create the popup menu. i am using graph editor examples and want to create popup menu in mxgraph when any shape created is clicked.
var newDiv = document.createElement("div");
newDiv.setAttribute("id","geApp");
var graphs = new mxGraph(document.getElementById("geApp"))
graphs.setTooltips(true);
new mxRubberband(graphs);
var parent = graphs.getDefaultParent();
graphs.popupMenuHandler.autoExpand = true;
// Installs context menu
graphs.popupMenuHandler.factoryMethod = function(menu, cell, evt)
{
menu.addItem('Item 1', null, function()
{
alert('Item 1');
});
menu.addItem('Item 2', null, function()
{
alert('Item 2');
});
menu.addSeparator();
var submenu1 = menu.addItem('Submenu 1', null, null);
menu.addItem('Subitem 1', null, function()
{
alert('Subitem 1');
}, submenu1);
menu.addItem('Subitem 1', null, function()
{
alert('Subitem 2');
}, submenu1);
};
I am getting error as
it skips the
graphs.popupMenuHandler.factoryMethod().
I want to create a popup menu or a context pad in mxgraph whenever a shape created on canvas is clicked.
The graph does not have createElement() function, instead you should use :
var t = document.createElement('div');
But why are you appending this div to container?
Please write the code in the following way. The return statement is missing in your code
graph.popupMenuHandler.factoryMethod = function(menu, cell, evt)
{
return createPopupMenu(menu, cell, evt);
};
function createPopupMenu(menu, cell, evt)
{
// Your code to add the menu item
}
I am working on a Web Application for a client and it has lots of graphs to show data about multiple things.
Currently I am working on a graph that will show skills for each Work item, since work items get added and changed all the time I can't have the chart setup like this...
var workName1 = {
labels : graphWork['New Work']['labels'],
datasets : [
{
fillColor : "rgba(151,187,205,0.5)",
highlightFill : "rgba(151,187,205,0.75)",
data: graphWork['New Work']['values']
}
]
}
window.onload = function(){
var ctx = document.getElementById("canvas").getContext("2d");
window.myBar = new Chart(ctx).Bar(workName1, {
// invertXY: true
// responsive : true,
});
}
Doing it this way would be too static and also because I will have a drop down that functions kind of like this,
$( "#typeUser" ).change(function() {
window.myBar.destroy();
chartType = $('#typeUser').val();
if(chartType == "Random Work"){
var ctx = document.getElementById("canvas").getContext("2d");
window.myBar = new Chart(ctx).Bar(randomWork, {
// responsive : true,
invertXY: true
});
}else if(chartType == "New Work"){
var ctx = document.getElementById("canvas").getContext("2d");
window.myBar = new Chart(ctx).Bar(workName1, {
// responsive : true,
invertXY: true
});
}
});
Again that is also very static and wouldn't allow for dynamic changes if new work gets added.
Question:
What can I do to set this up dynamically. I have thought about doing a $.each on graphWork and then some how creating the variable sets that way but then I dunno how I would do the change function or if that is the correct way to go about doing this?
I have setup a JSFiddle that is pulling data and can be used for testing and to see what I am doing. https://jsfiddle.net/L6396hsq/1/
u can with .draw() to new draw the canvaselement if u filled it with new data.
And with .reflow() u bring the start-motion back ;D
Maybe try this:
window.myBar.draw();
window.myBar.reflow();
I'm using Chartjs to display a Line Chart and this works fine:
// get line chart canvas
var targetCanvas = document.getElementById('chartCanvas').getContext('2d');
// draw line chart
var chart = new Chart(targetCanvas).Line(chartData);
But the problem occurs when I try to change the data for the Chart. I update the graph by creating a new instance of a Chart with the new data points, and thus reinitializing the canvas.
This works fine. However, when I hover over the new chart, if I happen to go over specific locations corresponding to points displayed on the old chart, the hover/label is still triggered and suddenly the old chart is visible. It remains visible while my mouse is at this location and disappears when move off that point. I don't want the old chart to display. I want to remove it completely.
I've tried to clear both the canvas and the existing chart before loading the new one. Like:
targetCanvas.clearRect(0,0, targetCanvas.canvas.width, targetCanvas.canvas.height);
and
chart.clear();
But none of these have worked so far. Any ideas about how I can stop this from happening?
I had huge problems with this
First I tried .clear() then I tried .destroy() and I tried setting my chart reference to null
What finally fixed the issue for me: deleting the <canvas> element and then reappending a new <canvas> to the parent container
My specific code (obviously there's a million ways to do this):
var resetCanvas = function(){
$('#results-graph').remove(); // this is my <canvas> element
$('#graph-container').append('<canvas id="results-graph"><canvas>');
canvas = document.querySelector('#results-graph');
ctx = canvas.getContext('2d');
ctx.canvas.width = $('#graph').width(); // resize to parent width
ctx.canvas.height = $('#graph').height(); // resize to parent height
var x = canvas.width/2;
var y = canvas.height/2;
ctx.font = '10pt Verdana';
ctx.textAlign = 'center';
ctx.fillText('This text is centered on the canvas', x, y);
};
I have faced the same problem few hours ago.
The ".clear()" method actually clears the canvas, but (evidently) it leaves the object alive and reactive.
Reading carefully the official documentation, in the "Advanced usage" section, I have noticed the method ".destroy()", described as follows:
"Use this to destroy any chart instances that are created. This will
clean up any references stored to the chart object within Chart.js,
along with any associated event listeners attached by Chart.js."
It actually does what it claims and it has worked fine for me, I suggest you to give it a try.
var myPieChart=null;
function drawChart(objChart,data){
if(myPieChart!=null){
myPieChart.destroy();
}
// Get the context of the canvas element we want to select
var ctx = objChart.getContext("2d");
myPieChart = new Chart(ctx).Pie(data, {animateScale: true});
}
This is the only thing that worked for me:
document.getElementById("chartContainer").innerHTML = ' ';
document.getElementById("chartContainer").innerHTML = '<canvas id="myCanvas"></canvas>';
var ctx = document.getElementById("myCanvas").getContext("2d");
We can update the chart data in Chart.js V2.0 as follows:
var myChart = new Chart(ctx, data);
myChart.config.data = new_data;
myChart.update();
I had the same problem here... I tried to use destroy() and clear() method, but without success.
I resolved it the next way:
HTML:
<div id="pieChartContent">
<canvas id="pieChart" width="300" height="300"></canvas>
</div>
Javascript:
var pieChartContent = document.getElementById('pieChartContent');
pieChartContent.innerHTML = ' ';
$('#pieChartContent').append('<canvas id="pieChart" width="300" height="300"><canvas>');
ctx = $("#pieChart").get(0).getContext("2d");
var myPieChart = new Chart(ctx).Pie(data, options);
It works perfect to me... I hope that It helps.
This worked very well for me
var ctx = $("#mycanvas");
var LineGraph = new Chart(ctx, {
type: 'line',
data: chartdata});
LineGraph.destroy();
Use .destroy this to destroy any chart instances that are created. This will clean up any references stored to the chart object within Chart.js, along with any associated event listeners attached by Chart.js. This must be called before the canvas is reused for a new chart.
It's best to use Chart.js specific functionalities to initially check for the existing chart instance and then perform destroy or clear in order to reuse the same canvas element for rendering another chart, instead of handlding HTML elements from within JS.
ChartJs's getChart(key) - finds the chart instance from the given key.
If the key is a string, it is interpreted as the ID of the Canvas element for the Chart.
The key can also be a CanvasRenderingContext2D or an HTMLDOMElement.
Note: This will return undefined if no Chart is found. If the instance of the chart is found, it signifies that the chart must have previously been created.
// JS - Destroy exiting Chart Instance to reuse <canvas> element
let chartStatus = Chart.getChart("myChart"); // <canvas> id
if (chartStatus != undefined) {
chartStatus.destroy();
//(or)
// chartStatus.clear();
}
//-- End of chart destroy
var chartCanvas = $('#myChart'); //<canvas> id
chartInstance = new Chart(chartCanvas, {
type: 'line',
data: data
});
<!-- HTML -Line Graph - Chart.js -->
<div class="container-fluid" id="chartContainer">
<canvas id="myChart" width="400" height="150"> </canvas>
</div>
This approach would save you from remove - create - append a Canvas element into DIV from inside JS.
Simple edit for 2020:
This worked for me. Change the chart to global by making it window owned (Change the declaration from var myChart to window myChart)
Check whether the chart variable is already initialized as Chart, if so, destroy it and create a new one, even you can create another one on the same name. Below is the code:
if(window.myChart instanceof Chart)
{
window.myChart.destroy();
}
var ctx = document.getElementById('myChart').getContext("2d");
Hope it works!
Complementing Adam's Answer
With Vanilla JS:
document.getElementById("results-graph").remove(); //canvas
div = document.querySelector("#graph-container"); //canvas parent element
div.insertAdjacentHTML("afterbegin", "<canvas id='results-graph'></canvas>"); //adding the canvas again
Using CanvasJS, this works for me clearing chart and everything else, might work for you as well, granting you set your canvas/chart up fully before each processing elsewhere:
var myDiv= document.getElementById("my_chart_container{0}";
myDiv.innerHTML = "";
I couldn't get .destroy() to work either so this is what I'm doing. The chart_parent div is where I want the canvas to show up. I need the canvas to resize each time, so this answer is an extension of the above one.
HTML:
<div class="main_section" >
<div id="chart_parent"></div>
<div id="legend"></div>
</div>
JQuery:
$('#chart').remove(); // this is my <canvas> element
$('#chart_parent').append('<label for = "chart">Total<br /><canvas class="chart" id="chart" width='+$('#chart_parent').width()+'><canvas></label>');
When you create one new chart.js canvas, this generate one new iframe hidden, you need delete the canvas and the olds iframes.
$('#canvasChart').remove();
$('iframe.chartjs-hidden-iframe').remove();
$('#graph-container').append('<canvas id="canvasChart"><canvas>');
var ctx = document.getElementById("canvasChart");
var myChart = new Chart(ctx, { blablabla });
reference:
https://github.com/zebus3d/javascript/blob/master/chartJS_filtering_with_checkboxs.html
This worked for me.
Add a call to clearChart, at the top oF your updateChart()
`function clearChart() {
event.preventDefault();
var parent = document.getElementById('parent-canvas');
var child = document.getElementById('myChart');
parent.removeChild(child);
parent.innerHTML ='<canvas id="myChart" width="350" height="99" ></canvas>';
return;
}`
Since destroy kind of destroys "everything", a cheap and simple solution when all you really want is to just "reset the data". Resetting your datasets to an empty array will work perfectly fine as well. So, if you have a dataset with labels, and an axis on each side:
window.myLine2.data.labels = [];
window.myLine2.data.datasets[0].data = [];
window.myLine2.data.datasets[1].data = [];
After this, you can simply call:
window.myLine2.data.labels.push(x);
window.myLine2.data.datasets[0].data.push(y);
or, depending whether you're using a 2d dataset:
window.myLine2.data.datasets[0].data.push({ x: x, y: y});
It'll be a lot more lightweight than completely destroying your whole chart/dataset, and rebuilding everything.
If you are using chart.js in an Angular project with Typescript, the you can try the following;
Import the library:
import { Chart } from 'chart.js';
In your Component Class declare the variable and define a method:
chart: Chart;
drawGraph(): void {
if (this.chart) {
this.chart.destroy();
}
this.chart = new Chart('myChart', {
.........
});
}
In HTML Template:
<canvas id="myChart"></canvas>
What we did is, before initialization of new chart, remove/destroy the previews Chart instance, if exist already, then create a new chart, for example
if(myGraf != undefined)
myGraf.destroy();
myGraf= new Chart(document.getElementById("CanvasID"),
{
...
}
Hope this helps.
First put chart in some variable then history it next time before init
#Check if myChart object exist then distort it
if($scope.myChart) {
$scope.myChart.destroy();
}
$scope.myChart = new Chart(targetCanvas
You should save the chart as a variable.
On global scope, if its pure javascript, or as a class property, if its Angular.
Then you'll be able to use this reference to call destroy().
Pure Javascript:
var chart;
function startChart() {
// Code for chart initialization
chart = new Chart(...); // Replace ... with your chart parameters
}
function destroyChart() {
chart.destroy();
}
Angular:
export class MyComponent {
chart;
constructor() {
// Your constructor code goes here
}
ngOnInit() {
// Probably you'll start your chart here
// Code for chart initialization
this.chart = new Chart(...); // Replace ... with your chart parameters
}
destroyChart() {
this.chart.destroy();
}
}
For me this worked:
var in_canvas = document.getElementById('chart_holder');
//remove canvas if present
while (in_canvas.hasChildNodes()) {
in_canvas.removeChild(in_canvas.lastChild);
}
//insert canvas
var newDiv = document.createElement('canvas');
in_canvas.appendChild(newDiv);
newDiv.id = "myChart";
Chart.js has a bug:
Chart.controller(instance) registers any new chart in a global property Chart.instances[] and deletes it from this property on .destroy().
But at chart creation Chart.js also writes ._meta property to dataset variable:
var meta = dataset._meta[me.id];
if (!meta) {
meta = dataset._meta[me.id] = {
type: null,
data: [],
dataset: null,
controller: null,
hidden: null, // See isDatasetVisible() comment
xAxisID: null,
yAxisID: null
};
and it doesn't delete this property on destroy().
If you use your old dataset object without removing ._meta property, Chart.js will add new dataset to ._meta without deletion previous data. Thus, at each chart's re-initialization your dataset object accumulates all previous data.
In order to avoid this, destroy dataset object after calling Chart.destroy().
for those who like me use a function to create several graphics and want to update them a block too, only the function .destroy() worked for me, I would have liked to make an .update(), which seems cleaner but ... here is a code snippet that may help.
var SNS_Chart = {};
// IF LABELS IS EMPTY (after update my datas)
if( labels.length != 0 ){
if( Object.entries(SNS_Chart).length != 0 ){
array_items_datas.forEach(function(for_item, k_arr){
SNS_Chart[''+for_item+''].destroy();
});
}
// LOOP OVER ARRAY_ITEMS
array_items_datas.forEach(function(for_item, k_arr){
// chart
OPTIONS.title.text = array_str[k_arr];
var elem = document.getElementById(for_item);
SNS_Chart[''+for_item+''] = new Chart(elem, {
type: 'doughnut',
data: {
labels: labels[''+for_item+''],
datasets: [{
// label: '',
backgroundColor: [
'#5b9aa0',
'#c6bcb6',
'#eeac99',
'#a79e84',
'#dbceb0',
'#8ca3a3',
'#82b74b',
'#454140',
'#c1502e',
'#bd5734'
],
borderColor: '#757575',
borderWidth : 2,
// hoverBackgroundColor : '#616161',
data: datas[''+for_item+''],
}]
},
options: OPTIONS
});
// chart
});
// END LOOP ARRAY_ITEMS
}
// END IF LABELS IS EMPTY ...
just declare let doughnut = null before creating your chart
const doughnutDriverStatsChartCanvas = $('#dougnautChartDriverStats').get(0).getContext('2d')
const doughnutOptionsDriverStats = {
maintainAspectRatio: false,
responsive: true,
}
let doughnut = null
doughnut = new Chart(doughnutDriverStatsChartCanvas, {
type: 'doughnut',
data: doughnutChartDriverStats,
options: doughnutOptionsDriverStats
})
I am new and I saw similar questions but quite old and without solution. All I want is to open new window inside activeTab and preserve the tab group. Unfortunately my code opens new window but does not keep the tabs, the window is just full screen.
I would greatly appreciate if someone could confirm if what I want to achieve is possible at all. Maybe with views somehow... Once again it should work for android. Here is the code:
// this sets the background color of the master UIView (when there are no windows/tab groups on it)
Titanium.UI.setBackgroundColor('#000');
// create tab group
var tabGroup = Titanium.UI.createTabGroup();
//
// create base UI tab and root window
//
var win1 = Titanium.UI.createWindow({
title:'Tab 1',
backgroundColor:'#fff'
});
var tab1 = Titanium.UI.createTab({
icon:'KS_nav_views.png',
title:'Tab 1',
window:win1
});
//
// create controls tab and root window
//
var win2 = Titanium.UI.createWindow({
title:'Tab 2',
backgroundColor:'#fff'
});
var tab2 = Titanium.UI.createTab({
icon:'KS_nav_ui.png',
title:'Tab 2',
window:win2
});
var label2 = Titanium.UI.createLabel({
color:'#999',
text:'I am Window 2',
font:{fontSize:20,fontFamily:'Helvetica Neue'},
textAlign:'center',
width:'auto'
});
win2.add(label2);
var data = [
{title:"Sample 1",color:'black',hasChild:true,font:{fontSize:16,fontWeight:'bold'}},
{title:"Sample 2",color:'black',hasChild:true,font:{fontSize:16,fontWeight:'bold'}}
];
var table = Titanium.UI.createTableView({
data:data,
separatorColor: '#ccc',
backgroundColor:'#fff'
});
win1.add(table);
// create table view event listener
table.addEventListener('click', function(e)
{
var win = Titanium.UI.createWindow({
url:'windows/main.js'
});
// this simply opens the new created window but full screen and without original tab group.
tabGroup.activeTab.open(win,{animated:true});
});
//
// add tabs
//
tabGroup.addTab(tab1);
tabGroup.addTab(tab2);
// open tab group
tabGroup.open();
There is currently no way to do that on android:
http://developer.appcelerator.com/question/145471/application-with-strange-navigation-how-to-implement-it#answer-252500
here you can find a demo of my solution...
http://sharesend.com/kbkasavo
hope this helps
You have to create navigation group for each tab windows.
For example
//Here's the first window...
var first = Ti.UI.createWindow({
backgroundColor:"#fff",
title:"My App"
});
Next, we’ll create a NavigationGroup. This is an iPhone-only component that controls a stack of windows (reference doc) – we’ll pass it our first window to use as its initially viewable window:
//Here's the nav group that will hold them both...
var firstnavGroup = Ti.UI.iPhone.createNavigationGroup({
window:first
});
//This is the main window of the application
var mainfirst = Ti.UI.createWindow();
mainfirst.add(firstnavGroup);
then assing this mainfirst window to tab.
Repeat this prosess for all tabs
Now when you need to open new window then you have to write
var second = Ti.UI.createWindow({
background:"#fff",
title:"Child Window"
});
firstnavGroup.open(second);
I hope this will help you.