Develop Reference

How do get I the clickable point from a html element?

how do I get the x,y coordinates from a HTML element relative to screen?
I'm using x,y from getBoundingClientRect() as below, but as you can see in the blow image, if I use move the cursor to this x,y position, the curson is in the middle between 0 and + buttons not the 5 button, which is the target button.
What am I missing?
JS code:
var e = document.querySelector('input[id=five]');"
var r = e.getBoundingClientRect();
var x = r.x;
var y = r.y;
MoveMouseTo(x,y); // imaginary call, the real cursor move is done by C# but I can share the code, as needed.
Image:
NOTE: if this aditional info may help, it's a C# application with embedded browser.

const getCoords = (e) => {
var x = e.clientX
var y = e.clientY
var xx = e.screenX
var yy = e.screenY
console.log(x, y, "client")
console.log(xx, yy, "screen")
}
You're going to want to assign this function to a onmousemove event to the outermost div containing the UI for your calculator. This should at least show you the difference between a screen X,Y and a client X,Y
https://www.w3schools.com/code/tryit.asp?filename=FVXZOK1SPTR0

You can try to add an event listener on your element and use the event to retrieve the coordinates of the mouse.
const $element = document.querySelector('input[id=five]');
$element.addEventListener('mousemove', handleMouseMove);
function handleMouseMove (event) {
console.log('Offset from the screen coordinates', event.screenX, event.screenY);
// The client refers to the element you are bound to;
console.log('Offset from the client coordinates', event.clientX, event.clientY);
};

How to correctly get mouse coordinates with JavaScript without JQuery?

I am aware of the fact that variations of that question were asked many times before. Looking through Google output I found pages with examples like that:
function point_it(event) {
pos_x = event.offsetX ? (event.offsetX) : event.pageX - document.getElementById("pointer_div").offsetLeft;
pos_y = event.offsetY ? (event.offsetY) : event.pageY - document.getElementById("pointer_div").offsetTop;
document.pointform.form_x.value = pos_x;
document.pointform.form_y.value = pos_y;
}
The code works, but when I look at
MouseEvent.offsetX it says "This is an experimental technology...".
So my question is, is it save to use the above construction or not? Is it better to learn how to use JQuery?

Please try this
function getClickPosition(e) {
var xPosition = e.clientX;
var yPosition = e.clientY;
}
Call this function on "onClick" event. You can get the coordinates.
Output the coordinates of the mouse pointer when the mouse button is clicked on an element.

event.pageX not working in Firefox, but does in Chrome

I am having what I thought was a simple problem, but after about a week of searching for the solution I can't seem to find the reason behind it.
Basically I am calling the function below every time the mouse is clicked, and it works fine in Chrome, but in Firefox the alert("This is not called") never gets called.
I know the problem is in the two lines of code:
x = event.pageX - canvas.offsetLeft;
y = event.pageY - canvas.offsetTop;
but can't seem to find whats wrong. Mozillas site says that event.pageX is a legitimate command to call,
and as well the canvas.offsetLeft.
But the function still isn't getting called. I have tried defining the variables in the function rather than globally, and that doesn't work, and have tried a few other alternatives out, including a jQuery event handler, but I want to try to stay away from jQuery if at all possible, mostly because I want to understand what's going on here, not just find something to patch over it.
Any help would be much appreciated.
also, the site in question is http://cabbibo.com.
EDIT:
If it helps at all, the rest of the Javascript in Firefox is running very slowly, which leads me to believe it could be a problem somewhere else in the code, for example when the side navigation is opening, each time the function for the animation is called, it takes much longer then it should.
function q(event){
if(hasBeenCalled==0){
event = event || window.event;
var canvas = document.getElementById('canvas');
x = event.pageX - canvas.offsetLeft;
y = event.pageY - canvas.offsetTop;
alert("This Is Not Called");
Changer2();
stopDraw();
moveToCenter();
t = setInterval(rotateDrawRec, 1);
}else{}
}

Instead of doing this:
<canvas id="canvas" onclick="q()" width="1000" height="900"></canvas>
function q(event){
if(hasBeenCalled==0){
event = event || window.event;
var canvas = document.getElementById('canvas');
x = event.pageX - canvas.offsetLeft;
y = event.pageY - canvas.offsetTop;
alert("This Is Not Called");
Changer2();
stopDraw();
moveToCenter();
t = setInterval(rotateDrawRec, 1);
}else{}
}
Try this:
<canvas id="canvas" width="1000" height="900"></canvas>
var canvasElem = document.getElementById('canvas');
canvasElem.addEventListener("click", q, false);
function q(event){
if(hasBeenCalled==0){
event = event || window.event;
x = event.pageX - this.offsetLeft;
y = event.pageY - this.offsetTop;
alert("This Is Not Called");
Changer2();
stopDraw();
moveToCenter();
t = setInterval(rotateDrawRec, 1);
}else{}
}
JSFiddle:
http://jsfiddle.net/5Xs2S/3/

Your site (http://cabbibo.com/) throws an "canvas3 is null" error on line 61:
var ctx3 = canvas3.getContext("2d");
This error halts the execution of the entire script, so understandably the alert in q() does not get called either.

javascript onmousemove get relative coordinates

function aim() {
var mousex = ?
}
<div class="gameArea" onmousemove="aim();"> </div>
I can't find how to get the mouse coordinates for an onmousemove event in javascript.

var guide = null;
function aim(event) {
if(window.event)
event = window.event; //grrr IE
var mousex = event.clientX - guide.offsetLeft;
alert('mouse x' + mousex)
}
function init() {
guide = document.getElementById("guide")
guide.onmousemove = aim;
}
<body onload="init();">
This appears to work on both browsers. I cant do onmousemove="aim();" in html because it doesn't pass the mousemove event object.

The above example using guide.offsetLeft only works if the enclosing element is at (0,0). If not, you can use guide.getBoundingClientRect().left (and similar for vertical coord)

Take a lot at the following script. I believe it should be exactly what you're looking for.
Capture Mouse Position

Getting mouse position in major internet browsers with javascript

I read this article regarding creating popup notes with javascript and css
The problem is that this one works only in IE since window.event is undefined in Firefox.
// assigns X,Y mouse coordinates to note element
note.style.left=event.clientX;
note.style.top=event.clientY;
So could you point me a fully working example? Or at least, how could i modify the javascript code to make it work in both internet browsers?

There are more than two browsers, but the following should work in most of them (adapted from the function on the page you linked to):
showNote = function(evt) {
evt = evt || window.event;
// gets note1 element
var note1=document.getElementById('note1');
// assigns X,Y mouse coordinates to 'note1' element
note1.style.left=evt.clientX;
note1.style.top=evt.clientY;
// makes note1 element visible
note1.style.visibility='visible';
};
The problem is that not all browsers have an event property of window and instead use an event object implicitly passed in as a parameter to an event handler function such as showNote. The evt = evt || window.event; line assigns window.event to the evt variable if no event parameter was passed into the function (which is what happens in Internet Explorer).

You can separate the two branches when you define the method.
It takes more characters than bundling them together,
but you do not have to check for support on every every call.
//
window.whereAt= (function(){
var fun;
if(typeof pageXOffset== 'number'){
fun= function(e){
var pX, pY, sX, sY;
pX= e.clientX || 0;
pY= e.clientY || 0;
sX= window.pageXOffset;
sY= window.pageYOffset;
return [(pX+sX), (pY+sY)];
}
}
else{
fun= function(e){
e= (e && e.clientX)? e: window.event;
var pX, pY, sX, sY;
pX= (e.clientX);
pY= (e.clientY);
var d= document.documentElement;
var b= document.body;
sX= Math.max(d.scrollLeft, b.scrollLeft);
sY= Math.max(d.scrollTop, b.scrollTop);
var pwot= [(pX+sX), (pY+sY)];
return pwot;
}
}
return fun;
})()
//test case
document.ondblclick= function(ev){
alert(whereAt(ev))
};

I finally found a solution, but using canvas.addEventListener instead of onclick funion bind in attributes of canvas. And it works in IE, FF, Chrome.
canvas.addEventListener('mousedown', ev_canvas, false);
function ev_mousedown(ev){
var posx=0;posy=0;
if (e.offsetX > 0) { // IE, Chrome
posx = e.offsetX;
posy = e.offsetY;
} else{ // Firefox
posx = e.layerX;
posy = e.layerY;
}
} // This also works correctly while zoom!=100%
<div style="position: relative;">
<canvas id="canvas" width="600" height="600" onClick="newClick()" style="position: relative;"></canvas>
</div>
See reference: http://dev.opera.com/articles/view/html5-canvas-painting/
The following codes doesn't work in Firefox.
showNote = function(evt) {
evt = evt || window.event;
// gets note1 element
var note1=document.getElementById('note1');
// assigns X,Y mouse coordinates to 'note1' element
note1.style.left=evt.clientX;
note1.style.top=evt.clientY;
// makes note1 element visible
note1.style.visibility='visible'
}
I have google for many solutions and referenced the relatively official site for browers differs: http://www.quirksmode.org/dom/w3c_cssom.html#mousepos
But still have not found a solution in Firefox 20.
window.event has no definition in FF. But works well in IE and Chrome.
I wonder have I misunderstood something in this point?