move a large div opposite to mouse movement - javascript

I have a table full of data that tends to be larger than the screen.
I put the table in a DIV and set the "overflow" to "auto" in CSS
div.scrolling-comps {
width : 970px;
height : 800px;
overflow : auto;
}
So the DIV can be scrolled up/down, left right using the browser's built-in scroll bars.
Problem is, the table can be WAAY bigger than the screen. And while the mousewheel will scroll it up/down, scrolling left/right is a pain in the hooch.
So, looking for a javascript/jquery or CSS way to scroll the div NATURALLY.
In other words, when someone viewing the huuuge table moves their mouse to the right, the DIV goes to the left (thus scrolling without using the scroll bars).
Something similar to this, but instead of following the mouse, the div would move opposite the mouse...
window.onload = function() {
var bsDiv = document.getElementById("box-shadow-div");
var x, y;
// On mousemove use event.clientX and event.clientY to set the location of the div to the location of the cursor:
window.addEventListener('mousemove', function(event) {
x = event.clientX;
y = event.clientY;
if (typeof x !== 'undefined') {
bsDiv.style.left = x + "px";
bsDiv.style.top = y + "px";
}
}, false);
}
#box-shadow-div {
position: fixed;
width: 1000px;
height: 800px;
border-radius: 0%;
background-color: black;
box-shadow: 0 0 10px 10px black;
top: 49%;
left: 48.85%;
}
<div id="box-shadow-div"></div>

The example you have about using the mouse position is interesting... But it is not what you need to achieve what you described.
In fact... What you need to know is the "ratio" between the div wrapping the table and its scrollWidth
Then, using the X position of the mouse, you can apply a scroll to the div in order to make it "move".
I used jQuery to do it using very few lines.
// Just to fake a big table
var fakeCell = $("<td>Some data</td>");
for(i=0;i<100;i++){
var fakeRow = $("<tr>");
for(k=0;k<50;k++){
fakeRow.append(fakeCell.clone().append(" "+k));
}
$("#test").append(fakeRow.clone());
}
// ---------------------------------------------------
// Calculate the "ratio" of the box-div width versus its scrollable width
var ratio = $("#box-div")[0].scrollWidth / $("#box-div").width();
console.log("Ratio: "+ratio);
// Scroll left/rigth based on mouse movement
$(window).on("mousemove", function(e){
var X = ratio * e.pageX;
// Scroll the div using the mouse position multiplyed by the ratio
$("#box-div").scrollLeft(X);
});
td{
white-space: nowrap;
border: 1px solid black;
}
#box-div{
overflow:auto;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>
<div id="box-div">
<table id="test">
</table>
</div>
</body>
So while the user moves the mouse over the div's width, you apply a scroll multiplied by the ratio... The effect is the user can scroll it all from the most left to most right ends easilly.

How about this?
wrap a table in div (i.e. parent-div) which is relatively positioned
Give position absolute to the target div.
And change left & top position of target div on mousemove event.
window.onload = function() {
var bsDiv = document.getElementById("box-shadow-div");
var x, y;
// On mousemove use event.clientX and event.clientY to set the location of the div to the location of the cursor:
window.addEventListener('mousemove', function(event) {
x = event.clientX;
y = event.clientY;
if (typeof x !== 'undefined') {
bsDiv.style.left = -x + "px";
bsDiv.style.top = -y + "px";
}
}, false);
}
.parent-div {
position: relative;
}
#box-shadow-div {
position: absolute;
width: 1000px;
height: 800px;
border-radius: 0%;
background-color: black;
box-shadow: 0 0 10px 10px black;
top: 0;
left: 0;
}
<div class="parent-div">
<div id="box-shadow-div"></div>
</div>

Have you tried changing x to -x? this will technically "invert" the effect.
window.onload = function() {
var bsDiv = document.getElementById("box-shadow-div");
var x, y;
// On mousemove use event.clientX and event.clientY to set the location of the div to the location of the cursor:
window.addEventListener('mousemove', function(event) {
x = event.clientX;
y = event.clientY;
if (typeof x !== 'undefined') {
bsDiv.style.left = -x + "px";
bsDiv.style.top = -y + "px";
}
}, false);
}
#box-shadow-div {
position: fixed;
width: 1000px;
height: 800px;
border-radius: 0%;
background-color: black;
box-shadow: 0 0 10px 10px black;
top: 49%;
left: 48.85%;
}
<div id="box-shadow-div"></div>

Related

How to let the coodinates of the cursor follow the cursor when hovering over a rectangle?

The following code always shows the coordinates of the cursor below the cursor:
function showCoords(e) {
var x = event.clientX;
var y = event.clientY;
var coor = "(" + x + ", " + y + ")";
document.getElementById("box").innerHTML = coor;
var bx = document.getElementById("box");
bx.style.left = e.pageX - 50;
bx.style.top = e.pageY + 20;
}
function clearCoords() {
document.getElementById("box").innerHTML = "";
}
div.relative {
position: relative;
width: 400px;
height: 300px;
border: 1px solid black;
}
div.abs {
position: absolute;
top: 100px;
right: 50px;
width: 200px;
height: 100px;
background-color: yellow;
}
<body onmousemove="showCoords(event)">
<div class="relative">
<div class="abs" onmousemove="showCoords(event)" onmouseout="clearCoords()"></div>
</div>
<div id="box" style="width:100px; height:30px; position:absolute"></div>
</body>
I only want the coordinates to be visible when the mouse pointer is hovering over the yellow rectangle.
If I change <body onmousemove="showCoords(event)"> to <body>, the coordinates are never visible.
How do I get the coordinates be visible only when hovering over the yellow rectangle?
Move the onmousemove listener from the body to the element you want to listen on - div.abs in this case.
I'd recommend not using the onmousemove attribute, in favour of using an entirely javascript solution - just to keep javascript-y things together. Something like (untested)
var listenOn = document.querySelector(".abs");
listenOn.addEventListener("mousemove", ShowCoords);

Javascript moving element to mouse click position, element not responding

I'm trying to get my png to move to the mouse click position when the user clicks within the container but I cant get the png to respond. I'm following this tutorial (https://www.youtube.com/watch?v=b4GwvdhrEQg), and stuck on the first test. my target doesnt respond to clicks at all.
Please help
var theGirl = document.querySelector("#girl");
var container = document.querySelector("#floor");
container.addEventListener("click", getClickPosition, false);
function getClickPosition(e) {
var xPosition = e.clientX - (theGirl.offsetWidth / 2);
var yPosition = e.clientY; - (theGirl.offsetHeight / 2)
var translate3dValue = "translate3d(" + xPosition + "px" + yPosition + "px, 0)";
theGirl.style.transform = translate3dValue;
}
#floor {
width: 700px;
height: 600px;
cursor: pointer;
overflow: visible;
border: 10px #EDEDED solid;
}
#girl {
height: 450px;
width: 200px;
border: 15px red solid;
transform: translate3d(50px, 50px, 0);
}
<body>
<div id="floor">
<div>
<img src="girl.png" id="girl"> </div>
</div>
Change #girl's position to absolute. I think it works after that.

Drag an element using JavaScript (Translating the position CSS3)

I am working on a small task, where I have to drag (translate) an element anywhere in the document freely. I have done the basic work but confused about the current position of the mouse. Because when I start dragging the element, the mouse position is not on the spot where the mousedown occurs.
Simply, I want the position of the mouse to stay on where I clicked on the box.
Here's the JSFiddle link.
Well you need to calculate the width and height of the element in order to keep the cursor in its center, note that now it's working with any width and height values, here i have added an animation just resizing width and height to see that always we get the center of the element
let target = document.querySelector(".drag");
function onDrag(e) {
// we could make them global variables instead
const {width, height} = window.getComputedStyle(target);
target.style.transform = `translate(${e.clientX - +width.replace("px", "") / 2}px, ${e.clientY - +height.replace("px", "") / 2}px)`;
}
function onLetGo() {
document.removeEventListener('mousemove', onDrag);
document.removeEventListener('mouseup', onLetGo);
}
function onGrab() {
document.addEventListener('mousemove', onDrag);
document.addEventListener('mouseup', onLetGo);
}
target.addEventListener('mousedown', onGrab);
* {
box-sizing: border-box;
}
.drag{
width: 100px;
height: 100px;
border: 1px solid black;
background: blue;
cursor: pointer;
position: fixed;
animation-name: resize;
animation-duration: 4s;
animation-timing-function: linear;
animation-iteration-count: infinite;
}
#keyframes resize {
0% {width: 100px}
25% {height: 150px}
50% {width: 150px}
100% {height: 100px}
}
<div class="drag"></div>
Edited to answer the comment of the OP
Thanks for the answer, it works fine. Is there any way, we can drag the div from any place where we click the div?
So now you want to drag the element from the clicked point and not from its center you can subtract event.offsetX from event.clientX to get the correct cursor position and the same for the y axis, and make sure there is no margin or padding for the containers, in this example I have removed the margin and padding from the HTML and BODY elements
let target = document.querySelector(".drag"), x = 0, y = 0;
function onDrag(e) {
// we use the coords of the mousedown event
target.style.transform = `translate(${e.clientX - x}px, ${e.clientY - y}px)`;
}
function onLetGo() {
document.removeEventListener('mousemove', onDrag);
document.removeEventListener('mouseup', onLetGo);
}
function onGrab(e) {
// we store the point of click(coords)
x = e.offsetX, y = e.offsetY;
document.addEventListener('mousemove', onDrag);
document.addEventListener('mouseup', onLetGo);
}
target.addEventListener('mousedown', onGrab);
* {
box-sizing: border-box;
}
html, body {
margin: 0;
padding: 0;
}
.drag{
width: 100px;
height: 100px;
border: 1px solid black;
background: blue;
cursor: pointer;
position: fixed;
}
<div class="drag"></div>
Well because transition is affected by margin, padding and other flow control rules you can avoid using it and just use the left and top rules to properly position your element like this
let target = document.querySelector(".drag"), x = 0, y = 0;
function onDrag(e) {
// use the `left` and `top` rules to properly position your element, so
// you no more care about other flow affecting rules
target.style.left = `${e.clientX - x}px`;
target.style.top = `${e.clientY - y}px`;
}
function onLetGo() {
document.removeEventListener('mousemove', onDrag);
document.removeEventListener('mouseup', onLetGo);
}
function onGrab(e) {
x = e.offsetX, y = e.offsetY;
document.addEventListener('mousemove', onDrag);
document.addEventListener('mouseup', onLetGo);
}
target.addEventListener('mousedown', onGrab);
.drag {
width: 100px;
height: 100px;
border: 1px solid black;
background: blue;
cursor: pointer;
position: fixed;
}
<div class="drag"></div>

Object with fixed Y-axis that follows the mouse on X-axis

I need help for an effect I'm trying to create: I made a CSS triangle and I want it to be fixed on the Y-axis but follow the mouse on his X-axis (didn't you read the title ?!). If it's not clear, I want it to move only to the left/right but not up/down. I managed to apply a js script I found on the internet to my triangle but I can't figure out how to change it to stop it from moving on the Y-axis. When I try to change anything, the whole thing doesn't move anymore. Can some one help me ?
// Here get the Div that you want to follow the mouse
var div_moving = document.getElementById('div_moving');
// Here add the ID of the parent element
var parent_div = 'parent_div';
// object to make a HTML element to follow mouse cursor ( http://coursesweb.net/ )
var movingDiv = {
mouseXY: {}, // will contain the X, Y mouse coords inside its parent
// Get X and Y position of the elm (from: vishalsays.wordpress.com/ )
getXYpos: function(elm) {
x = elm.offsetLeft; // set x to elm’s offsetLeft
y = elm.offsetTop; // set y to elm’s offsetTop
elm = elm.offsetParent; // set elm to its offsetParent
//use while loop to check if elm is null
// if not then add current elm’s offsetLeft to x, offsetTop to y and set elm to its offsetParent
while(elm != null) {
x = parseInt(x) + parseInt(elm.offsetLeft);
y = parseInt(y) + parseInt(elm.offsetTop);
elm = elm.offsetParent;
}
// returns an object with "xp" (Left), "=yp" (Top) position
return {'xp':x, 'yp':y};
},
// Returns object with X, Y coords inside its parent
getCoords: function(e) {
var xy_pos = this.getXYpos(e.target);
// if IE
if(navigator.appVersion.indexOf("MSIE") != -1) {
var standardBody = (document.compatMode == 'CSS1Compat') ? document.documentElement : document.body;
x = event.clientX + standardBody.scrollLeft;
y = event.clientY + standardBody.scrollTop;
}
else {
x = e.pageX;
y = e.pageY;
}
x = x - xy_pos['xp'];
y = y - xy_pos['yp'];
return {'xp':x, 'yp':y};
}
};
// registers 'mousemove' event to parent_div
document.getElementById(parent_div).addEventListener('mousemove', function(e){
mouseXY = movingDiv.getCoords(e);
div_moving.style.left = mouseXY.xp + 8 +'px';
div_moving.style.top = mouseXY.yp - 8 +'px';
});
#parent_div {
position: relative;
width: 100%;
height: 800px;
margin: 1em auto;
border; 1px solid #333;
background: #fefebe;
}
#div_moving {
position: absolute;
width: 41em;
height: 31em;
margin: 0;
border: 1px solid #33f;
background: #88ee99;
overflow:hidden;
}
.container {
width: 37.5em;
height: 37.5em;
position: relative;
border-top: 20px solid #e74c3c;
left:3%;
}
.triangle {
position: relative;
margin: auto;
top: -20em;
left: 0;
right: 0;
width:31em;
height:31em;
transform: rotate(45deg);
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-o-transform: rotate(45deg);
-ms-transform: rotate(45deg);
border-right: 20px solid #e74c3c;
border-bottom: 20px solid #e74c3c;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="parent_div">
<div id="div_moving">
<div class="container">
<div class="triangle"></div>
</div>
</div>
Content in parent ...
</div>
I just reformatted a little, then commented one line and it's working in Chrome on my machine. Is this what you're looking for?
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script language="javascript">
// object to make a HTML element to follow mouse cursor ( http://coursesweb.net/ )
var movingDiv = {
mouseXY: {}, // will contain the X, Y mouse coords inside its parent
// Get X and Y position of the elm (from: vishalsays.wordpress.com/ )
getXYpos: function(elm) {
x = elm.offsetLeft; // set x to elm’s offsetLeft
y = elm.offsetTop; // set y to elm’s offsetTop
elm = elm.offsetParent; // set elm to its offsetParent
//use while loop to check if elm is null
// if not then add current elm’s offsetLeft to x, offsetTop to y and set elm to its offsetParent
while(elm != null) {
x = parseInt(x) + parseInt(elm.offsetLeft);
y = parseInt(y) + parseInt(elm.offsetTop);
elm = elm.offsetParent;
}
// returns an object with "xp" (Left), "=yp" (Top) position
return {'xp':x, 'yp':y};
},
// Returns object with X, Y coords inside its parent
getCoords: function(e) {
var xy_pos = this.getXYpos(e.target);
// if IE
if(navigator.appVersion.indexOf("MSIE") != -1) {
var standardBody = (document.compatMode == 'CSS1Compat') ? document.documentElement : document.body;
x = event.clientX + standardBody.scrollLeft;
y = event.clientY + standardBody.scrollTop;
}
else {
x = e.pageX;
y = e.pageY;
}
x = x - xy_pos['xp'];
y = y - xy_pos['yp'];
return {'xp':x, 'yp':y};
}
};
$(document).ready(function() {
// Here get the Div that you want to follow the mouse
var div_moving = document.getElementById('div_moving');
// Here add the ID of the parent element
var parent_div = 'parent_div';
// registers 'mousemove' event to parent_div
document.getElementById(parent_div).addEventListener('mousemove', function(e){
mouseXY = movingDiv.getCoords(e);
div_moving.style.left = mouseXY.xp + 8 +'px';
//div_moving.style.top = mouseXY.yp - 8 +'px';
});
});
</script>
<style>
#parent_div {
position: relative;
width: 100%;
height: 800px;
margin: 1em auto;
border; 1px solid #333;
background: #fefebe;
}
#div_moving {
position: absolute;
width: 41em;
height: 31em;
margin: 0;
border: 1px solid #33f;
background: #88ee99;
overflow:hidden;
}
.container {
width: 37.5em;
height: 37.5em;
position: relative;
border-top: 20px solid #e74c3c;
left:3%;
}
.triangle {
position: relative;
margin: auto;
top: -20em;
left: 0;
right: 0;
width:31em;
height:31em;
transform: rotate(45deg);
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-o-transform: rotate(45deg);
-ms-transform: rotate(45deg);
border-right: 20px solid #e74c3c;
border-bottom: 20px solid #e74c3c;
}
</style>
</head>
<body>
<div id="parent_div">
<div id="div_moving">
<div class="container">
<div class="triangle"></div>
</div>
</div>
Content in parent ...
</div>
</body>
</html>
Differences:
Load the JQuery script first
Process the listener in a ready function so all the content has been loaded
Comment out the Y positioning
EDIT: I found a solution to my problem.
So here the problems and what I did:
I wanted the object to move only on X-axis and not Y: IgnusFast found out the line to delete was "div_moving.style.top = mouseXY.yp - 8 +'px';"
I wanted it to stop staggering when the mouse passed over it: deleted "parseInt(x) +" in "while(elm != null) {x = parseInt(x) + parseInt(elm.offsetLeft); elm = elm.offsetParent;}" (makes the div stay where it is when not sure.
I wanted it to center with the mouse instead of being on its right: original was " div_moving.style.left = mouseXY.xp + 8 +'px';" wich made it go 8 pixels to the right of the current mouse's coordinates so I just used a negative number and place like this :" div_moving.style.left = mouseXY.xp + -350 +'px';"

Get exact relative mouse position X Y

I create table, handlers hooked up mousemove.
But in top left point I get .offsetX.offsetY equals -5-5.
Why? I need 0\0.
<table cellpadding="0"
id="target"
cellspacing="0"
width="602"
height="500"
style="float:left;
position:relative;
background: url(/content/games/kamikaze2/back.jpg) no-repeat 0 0;">
<tbody>...
</tbody>
</table>
<script type="text/javascript">
$("#target").mousemove(function (event) {
var msg = "Handler for .mousemove() called at ";
msg += event.offsetX + ", " + event.offsetY;
$("#log").append("<div>" + msg + "</div>");
});
</script>
More examples here: show-popup-on-mouse-location
Mouse coordinates within element
The most accurate way to get the mouse coordinates within an element (without scrollbars) relative to viewport is by calculating the difference between
MouseEvent.clientX, MouseEvent.clientY and
Element.getBoundingClientRect()
const getMousePos = (evt) => {
const pos = evt.currentTarget.getBoundingClientRect();
return {
x: evt.clientX - pos.left,
y: evt.clientY - pos.top
};
};
document.querySelector("#target").addEventListener('mousemove', (evt) => {
const mPos = getMousePos(evt);
evt.currentTarget.textContent = `Mouse position x:${mPos.x} y:${mPos.y}`;
});
#target {
position: absolute;
left: 50px;
top: 20px;
width: 200px;
height: 100px;
background: #0bf;
transform: translate(20px, 30px); /* works even with translate */
}
<div id="target"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
Subtracting those values you can retrieve the exact mouse position, x:0, y:0 being the upper left corner of your element. Even if an element is CSS-transformed, i.e: transform: translate(-50%, -50%), the returned values are still correct.

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