How to change the cursor icon when dragging in HTML5?
I didn't care about a particular cursor, I just wanted to get rid of the "crossed circle" one. My solution was to include dragover event (with following function) to all elements, that already had dragenter, dragstart and dragend events.
function dragover(event)
{
event.dataTransfer.dropEffect = "move";
event.preventDefault();
}
Do you actually need the Drag API? I found that I was using the Drag API because I was having trouble with the reliability of mouse events (mouseups not being captured, for example).
The Drag API is only for drag-and-drop functionality, and, if you're simply fiddling with the reliability of your clicking and pointing events, a new API, .setPointerCapture is made to handle these cases more effectively. Here's the minimal viable way to achieve this:
el.onpointerdown = ev => {
el.onpointermove = pointerMove
el.setPointerCapture(ev.pointerId)
}
pointerMove = ev => {
console.log('Dragged!')
}
el.onpointerUp = ev => {
el.onpointermove = null
el.releasePointerCapture(ev.pointerId)
}
Beautifully, you will maintain full control over your cursor's display style.
use mousedown and mousemove
window.app = {
dragging: false,
config: {
canDrag: false,
cursorOffsetX: null,
cursorOffsetY: null
},
reset: function () {
this.config.cursorOffsetX = null;
this.config.cursorOffsetY = null;
},
start: function () {
document.getElementById('target').addEventListener('mousedown', function (event) {
console.log('+++++++++++++ dragstart');
this.dragging = true;
this.config.cursorOffsetX = event.offsetX;
this.config.cursorOffsetY = event.offsetY;
this.adjustPostion(event);
}.bind(this));
document.getElementById('target').addEventListener('mousemove', function (event) {
if (this.dragging) {
console.log('+++++++++++++ drag');
event.target.style.cursor = 'move';
this.adjustPostion(event);
}
}.bind(this));
document.getElementById('target').addEventListener('mouseup', function (event) {
console.log('+++++++++++++ dragend');
this.dragging = false;
event.target.style.cursor = 'pointer';
this.reset();
}.bind(this));
},
adjustPostion: function (event) {
if (event.clientX <= 0 || event.clientY <= 0) {
console.log('skipped');
return;
}
var elm = document.getElementById('target');
elm.style.left = (event.clientX - this.config.cursorOffsetX) + 'px';
elm.style.top = (event.clientY - this.config.cursorOffsetY) + 'px';
console.log(event.pageX);
console.log(event.pageY);
}
};#target {
position: absolute;
top: 100px;
left: 100px;
width: 400px;
height: 400px;
background-color: red;
-moz-user-select: none;
-ms-user-select: none;
-webkit-user-select: none;
user-select: none;
}
#ui1 {
position: absolute;
top: 50px;
left: 50px;
width: 100px;
height: 400px;
background-color: blue;
z-index: 100;
}
#ui2 {
position: absolute;
top: 50px;
left: 550px;
width: 100px;
height: 400px;
background-color: green;
z-index: 100;
}<!-- simulate -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>title</title>
</head>
<body onload="window.app.start();">
<div id="ui1"></div>
<div id="ui2"></div>
<div id="target"></div>
</body>
</html>