Develop Reference

Add text box on leaflet map with selected overlay layer name

Relatively new JavaScript user here, first question.
So I have a choropleth leaflet map that uses a jQuery slider (via https://github.com/dwilhelm89/LeafletSlider) to shift between years. The map contains about 50 years of global data, with each overlay layer corresponding to a layergroup containing each country's data for the appropriate year.
The purpose of the slider is to allow the user to quickly shift between years. However, I would like a visual cue to let the user know what year is being displayed at any moment. Is it possible to display something like a text box on the map that displays the name of the current overlay layer and automatically updates whenever the overlay layer switches? (the name of each layergroup is its respective year)
I know the textbox part is certainly possible
(Overlaying a text box on a leaflet.js map), but I'm not sure how to dynamically update it with the necessary info.
Thanks! Let me know if you need my code and I'll post it.

Okay, I thought a bit and here's a quick solution.
var sliderControl = null;
var map = L.map("map").setView([51.95, 7.6], 9);
L.tileLayer("//{s}.tile.osm.org/{z}/{x}/{y}.png", {
attribution:
'© OpenStreetMap contributors',
}).addTo(map);
//Fetch some data from a GeoJSON file
$.getJSON(
"https://dwilhelm89.github.io/LeafletSlider/points.json",
function (json) {
var testlayer = L.geoJson(json);
var sliderControl = L.control.sliderControl({
position: "topright",
layer: testlayer,
range: true,
});
//Make sure to add the slider to the map ;-)
map.addControl(sliderControl);
//An initialize the slider
sliderControl.startSlider();
}
);
map.on("layeradd", function () {
map.eachLayer(function (layer) {
if (layer instanceof L.Marker) {
let desc = document.querySelector(".description");
// desc.textContent = JSON.stringify(layer.getLatLng());
desc.textContent = layer.feature.properties.time;
}
});
});
// create legend
const legend = L.control({ position: "bottomleft" });
legend.onAdd = function () {
let div = L.DomUtil.create("div", "description");
div.className = "description";
return div;
};
legend.addTo(map);
*,
:after,
:before {
box-sizing: border-box;
padding: 0;
margin: 0;
}
html {
height: 100%;
}
body,
html,
#map {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
.description {
border: 1px solid black;
background: #fff;
}
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.6.0/dist/leaflet.css" />
<link rel="stylesheet" href="https://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" type="text/css">
<script src="https://unpkg.com/leaflet#1.6.0/dist/leaflet.js"></script>
<script src="https://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="https://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.2/jquery.ui.touch-punch.min.js"></script>
<script src="https://rawgit.com/dwilhelm89/LeafletSlider/master/SliderControl.js" type="text/javascript"></script>
<div id="map"></div>
And I recommend using the newer version of this plugin ;)
There you have the method event
And the easier way to download the data about the marker.

I've used Leaflet, Mapbox, and Google Maps on some personal and commercial projects, and whenever I wanted to overlay some information, I'd just use simple HTML elements. All you need to do is render whatever elements you want on the screen the same way you would normally, just ensure that you use correct position and applicable positioning units and ensure you have a higher z-index on your element that you want to show, i.e. your year indicator, than you do on your map element. Treat it just like you would any other HTML!
Edit:
Here is an example screenshot: https://imgur.com/a/2fXf5CI. Also, if you aren't already using a position property on your Leaflet map, you should go ahead and add a position: relative; property to the selector for the map so that you can also assign it a z-index. And then, in your year indicator's styles, give it a higher z-index value than the one you gave to your Leaflet map.

javascript joystick for a camera

Hey I need to create a joystick for a camera control.
The joystick need to be able to move to four directions: left,right,up and down and two have functionality of stop.
I have search the web for hours, finally I found something which called nipplejs.
I have attached the code of nipplejs to this thread:
var radius = 100;
var sampleJoystick = {
mode: 'static',
position: {
left: '50%',
top: '50%'
},
size: radius*2,
color: 'black'
};
var joystick;
var position;
joystick = nipplejs.create(sampleJoystick);
joystick.on('start end', function(evt, data) {
position = data;
}).on('move', function(evt, data) {
position = data;
}).on('dir:up plain:up dir:left plain:left dir:down' +
'plain:down dir:right plain:right',
function(evt, data) {
//position=data;
}
).on('pressure', function(evt, data) {
position=data;
});
<script src="//yoannmoinet.github.io/nipplejs/javascripts/nipplejs.js"></script>
<div id="zone_joystick">
</div>
At first glance it looks like the perfect library, but on second look I can see that I have no directions indicators on the joystick and I can't implement a stop behavior with this joystick, and it won't be intuitive control for elders who will use the software.
I am looking for alternative solution for a panel control which have the functionalities which I have talked about.
functionalities:
joystick which can be turn to 4 different directions: Left,Right,Up and Down.
joystick have a stop functionality as well.

You have to connect to the hardware first, before you can read its input. Have you considered using the browser native GamePad API? This doesn't work in all browsers though.
https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API

Changing All Icons Rotating Down to One

I currently have a giant table of "auditpoints", some of those points are "automated". If they are automated they receive a gear icon in their row. The gear icon is not the only icon each row receives. Each row, no matter if it's automated or not receives two other icons, a pencil and a toggle button. When an automated point "runs" the gear icon rotates until it is finished "running". I've have implemented some code to ran all of these points at once but I have a small problem. When you click my button to run all these points all three of the icons I have mentioned rotate and this is not the result I am looking for. The line commented out in my code snippet (and it's matching bracket) will prevent the code from running all of the automated points. Commenting out the line is what causes all the icons to rotate. I know this line is required to get the automated points to run properly as it used in the single execution of automated points I just don't know what to change it to. It obviously shouldn't be click because you are no longer clicking the gear icon to get a point to run I just don't know what to change it to but the classes in that click function are related to the gear icon.
Hopefully this is a very easy question to solve and doesn't waste anyone's time. Thank you!
private updateAuto() {
var self = this;
$(".auditPointRow").each(function () {
//self.el.on("click", ".update, .edit", function () {
var row = $(this).closest(".auditPointRow");
var id = row.data("id");
var automated = (<string>row.data("automated")).toLowerCase() == "true";
var running = true;
if (automated && $(this).closest(".edit").length == 0) {
var gear = $(this).find(".fa");
var maxTurns = 120;
gear.css("transition", "transform linear " + maxTurns * 2 + "s");
gear.css("transform", "rotate(" + (maxTurns * 360) + "deg)");
var request = $.ajax(self.root + "api/sites/" + self.site.ID + "/auditpoints/" + id, {
"type": "PATCH", data: JSON.stringify([
{
Op: "Replace"
, Path: "/score"
, Value: "run"
}
])
});
request.done(function () {
gear.css("transition", "").css("transform", "rotate(0deg)");
row.prev().find("td").css("background-color", "");
if (row.prev().qtip("api")) {
row.prev().qtip("api").destroy(true);
}
});
}
//}
});
}

I think I found a solution to my problem. I used .each again to go through all of the "gears" and only rotate them.
private updateAuto() {
var self = this;
//$(".auditPointRow").each(function () {
$(".update, .edit").each(function () {
//Left out the rest of the code so this answer isn't too
//long, none of it changed if that matters.
});
//});
}
For some reason the result runs very slowly (but it runs!) and I'm not sure why so if anyone has any better suggestion/optimizations please feel free to leave those here.
Edit: I realized I didn't to go through .each twice, that's what was slowing to down so I removed that first each that went over auditPoints and just did the ones with gears instead.

About image rotation once element with specific id is clicked

Logo and elements from ul once clicked rotates image. By default image is already rotated by certain degrees, then on each click image rotates to necessary value.
So far I was using the following:
$("#objRotates").css('opacity','.2');
var value = 0;
var prev_value = 0;
$( "li" ).click(function() {
var text=$(this).text();
if(text==="text1"){value=0;}
if(text==="text2"){value=33;}
if(text==="text3"){value=66;}
if(prev_value != value){
$("#objRotates").animate({opacity:'1'});
$("#objRotates").rotate({
animateTo:value,
easing: $.easing.easeInOutExpo,
center: ["25px", "150px"],
callback: function(){$("#objRotates").animate({opacity:'0.2'});}
});
}
prev_value = value;
});
Above code is the one that was used before, where images start position was 0 and its animation was triggered from link text.
Using jqueryRotate.js examples(here)
How do I change the code, so that images start position is certain degrees and animation starts if element with specific ID is clicked?
Give at least clue..Cause for now, looking at my old code, I am lost. Thanks in advance.
SIMPLIFIED FIDDLE

Ok, so I've created a couple of samples for you to check out. The first one is very basic and I've simplified the code a little to make it easier to understand. This one just uses completely static values and a static elementId for the event, which I'm pretty sure answers your question based on your response to my comment yesterday. http://jsfiddle.net/x9ja7/594/
$("#elementId").click(function () {
var startingAngle = 45;
var endingAngle = 90;
var elementToRotate = "img";
$(elementToRotate).rotate({
angle: startingAngle,
animateTo: endingAngle
});
});
But I wanted to give another example as well that would be dynamic and repeatable for multiple elements. With the code above, you would have to copy/paste the same code over and over again if you want to perform this animation by clicking different elements. Here's an alternative. In this example, you set all of your parameters in the data attributes in the clickable element, then the function is completely repeatable, you only have to write it once. Less code = everyone happy! Here's the example: http://jsfiddle.net/x9ja7/595/
//#region Default starting angles
$("#image1").rotate({ angle: 90 });
$("#image2").rotate({ angle: 20 });
//#endregion
$(".rotateAction").click(function () {
//#region Optional parameter - used in the optional callback function
var $self = $(this);
//#endregion
var startingAngle = Number($(this).attr("data-startingangle"));
var endingAngle = Number($(this).attr("data-endingangle"));
var elementToRotate = $(this).attr("data-elementtorotate");
//#region If the current angle is the ending angle, reverse the animation - this can be removed if you want, I thought it may be cool to show some of the things you can do with this.
var currentAngle = $(elementToRotate).getRotateAngle();
if ( currentAngle[0] === endingAngle) {
startingAngle = Number($(this).attr("data-endingangle"));
endingAngle = Number($(this).attr("data-startingangle"));
}
//#endregion
$(elementToRotate).rotate({
angle: startingAngle,
animateTo: endingAngle
//#region This is optional - uncommenting this code would make the animation single-use only
//, callback: function () { $self.off().removeClass("clickable"); }
//#endregion
});
});
Hope this helps. If you need any other assistance, please let me know.

how to build a 3d donut chart

I wonder if it's possible to build a 3d donut chart in html.
I have found a interesting link here but infortunatly i need to add links (or javascript event) when clicking to launch a ajax request.
Have you ever done such a thing ?
Thanks for your answers

See the following example I've just made:
http://jsfiddle.net/baQCD/3/embedded/result/
The key point (pun intended) is to add a url key for each row (object) in the data array, and use it in the 'click' event handler:
point: {
events: {
click: function(e) {
location.href = e.point.url;
e.preventDefault();
}
}
},
In your case instead of opening a new url, you could do your ajax request or do anything else. In my example I've shown how to manipulate the data and title.
click: function(e) {
if (this.name == "Randomize!") {
sliceK = getRandomInt(0,chart.series[0].data.length-1);
chart.options.series[0].data[sliceK].y = getRandomInt(1,30);
chart = new Highcharts.Chart(chart.options);
} else if (this.name == "Link") {
location.href = this.url;
e.preventDefault();
} else {
chart.setTitle(null,{text:this.name + " clicked"});
}
}
You can immediately see, 2 features I very like in Highcharts, the ability to print or download the chart, and the ability to disable part of the data (removing it from the chart) by clicking on the legend.
This is based on the code shown in:
http://birdchan.com/home/2012/09/07/highcharts-pie-charts-can-have-url-links/
http://www.highcharts.com/demo/3d-pie-donut/

this is a simple 3d Axonometric class i wrote for testing, its very simple it puts the canvas transformation into a plane of zy or zx or yx... it uses canvas setTransform
you first have to call the axionometric class with phi and theta the angles of view
get_bd is a function where you can enter x,y,z coordinates and the method returns an object with b and d value... b is the x of the screen and d is the y of the screen.
i have appended and example, you just have to put a canvas tag in the html with id canvasView
//3d Maths - Axonometric -- Artner Thorsten -- Austria -- Wiener Neustadt
var context=document.getElementById("canvasView").getContext("2d");
function Axonometric (phi,theta)
{
var cosPHI=Math.cos(phi);
var sinPHI=Math.sin(phi);
var cosTHETA=Math.cos(theta);
var sinTHETA=Math.sin(theta);
this.cosPHI=cosPHI;
this.sinPHI=sinPHI;
this.cosTHETA=cosTHETA;
this.sinTHETA=sinTHETA;
this.phi=phi;
this.theta=theta;
}
Axonometric.prototype.get_bd=function (x,y,z)
{
var b=y*this.cosPHI-x*this.sinPHI-500;
var d=x*this.cosPHI*this.cosTHETA+y*this.sinPHI*this.cosTHETA-z*this.sinTHETA+500;
return {b:b,d:d};
}
Axonometric.prototype.plane_zy=function (x)
{
context.setTransform (0,this.sinTHETA,-this.cosPHI,this.sinPHI*this.cosTHETA,500+x*this.sinPHI,500+x*this.cosPHI*this.cosTHETA);
}
Axonometric.prototype.plane_zx=function (y)
{
context.setTransform (this.sinPHI,this.cosPHI*this.cosTHETA,0,this.sinTHETA,500+y*-this.cosPHI,500+y*this.sinPHI*this.cosTHETA);
}
Axonometric.prototype.plane_yx=function (z)
{
context.setTransform (this.sinPHI,this.cosPHI*this.cosTHETA,-this.cosPHI,this.sinPHI*this.cosTHETA,500,500-z*this.sinTHETA);
}
Axonometric.prototype.draw_axis=function (length)
{
var O=this.get_bd (0,0,0);
var X=this.get_bd (length,0,0);
var Y=this.get_bd (0,length,0);
var Z=this.get_bd (0,0,length);
context.save;
context.beginPath ();
context.textAlign="top";
context.fillText ("X",-X.b,X.d);
context.moveTo (-O.b,O.d);
context.lineTo (-X.b,X.d);
context.strokeStyle="red";
context.stroke ();
context.beginPath ();
context.fillText ("Y",-Y.b,Y.d);
context.moveTo (-O.b,O.d);
context.lineTo (-Y.b,Y.d);
context.strokeStyle="green";
context.stroke ();
context.beginPath ();
context.fillText ("Z",-Z.b,Z.d);
context.moveTo (-O.b,O.d);
context.lineTo (-Z.b,Z.d);
context.strokeStyle="blue";
context.stroke ();
context.restore ();
}
// example
var Viewer=new Axonometric (Math.PI/4, Math.PI/8);
Viewer.draw_axis (400);
Viewer.plane_yx (0);
context.beginPath ();
context.fillStyle="red";
context.fillRect (0,0,200,200);
Viewer.plane_zx (0);
context.beginPath ();
context.fillStyle="lightgrey";
context.fillRect (0,0,200,-200);
Viewer.plane_zy (0);
context.beginPath ();
context.arc (-100,100,100,0,2*Math.PI);
context.fillStyle="black";
context.fill();

Using an existing library is an easy solution. If I'm understanding your question properly, you would like users to be able to click on a slice to open a new URL.
This can be achieved in ZingChart by setting up a "pie3d" type, and then including "url" and "target" in the series.
Here's how I did it:
{
"graphset":[
{
"type":"pie3d",
"plot":{
"slice":45
},
"plotarea":{
"margin-top":"35px"
},
"series":[
{
"text":"Apples",
"values":[5],
"url":"http://www.google.com",
"target":"_blank"
},
{
"text":"Oranges",
"values":[8]
},
{
"text":"Bananas",
"values":[22]
},
{
"text":"Grapes",
"values":[16]
},
{
"text":"Cherries",
"values":[12]
}
]
}
]
}

Expanding on Merrily's answer, you can also use ZingChart's API to track chart interaction and call any functions you like.
var ZCwindow;
function openWindow() {
ZCwindow = window.open("http://zingchart.com/docs/chart-types/pie/", "ZingChart Pie Charts");
}
zingchart.node_click = function(e){
if(e.value == 5) openWindow();
};
You can view a live demo here.
I am part of the ZingChart team. You can reach out to us for assistance via support#zingchart.com

For the past few months I have been working with Google Visualization charts, and I think it may be exactly what you're looking for. Here is the link to the documentation.
This will give you a donut chart (though I am not sure if you can make it 3-D or not, I believe you can) and you can add event handlers for when the user clicks on a slice. Here's what it looks like:
I highly recommend trying the charts, I have found them to be extraordinarily useful. Good luck!
EDIT: My apologies, after re-reading the section on donut charts it appears the new API does not yet support 3-D donut charts. Does it absolutely have to be three-dimensional? If not this is still an excellent choice.

It's not 3D, but you should have a look at chart.js