当用户拖动 DIV(下例中的红色 div)时,我需要设置光标图标。
我尝试了几次尝试,包括使用 CSS cursor:move
和 event.dataTransfer.dropEffect
但都没有成功,因为图标总是显示一个“交叉圆” .
关于如何使用 HTML5 拖放 API 解决这个问题有什么想法吗?
http://jsbin.com/hifidunuqa/1/
<script>
window.app = {
config: {
canDrag: false,
cursorOffsetX: null,
cursorOffsetY: null
},
reset: function () {
this.config.cursorOffsetX = null;
this.config.cursorOffsetY = null;
},
start: function () {
document.getElementById('target').addEventListener('dragstart', function (event) {
console.log('+++++++++++++ dragstart')
this.config.cursorOffsetX = event.offsetX;
this.config.cursorOffsetY = event.offsetY;
this.adjustPostion(event);
event.dataTransfer.effectAllowed = 'move';
event.dataTransfer.dropEffect = 'move';
}.bind(this));
document.getElementById('target').addEventListener('drag', function (event) {
console.log('+++++++++++++ drag')
this.adjustPostion(event);
}.bind(this));
document.getElementById('target').addEventListener('dragend', function (event) {
console.log('+++++++++++++ dragend')
this.reset();
}.bind(this));;
},
adjustPostion: function (event) {
if (event.pageX <= 0 || event.pageY <= 0) {
console.log('skipped');
return;
}
var elm = document.getElementById('target');
elm.style.left = (event.pageX - this.config.cursorOffsetX) + 'px';
elm.style.top = (event.pageY - this.config.cursorOffsetY) + 'px';
console.log(event.pageX);
console.log(event.pageY);
}
};
</script>
最佳答案
使用 mousedown 和 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>
关于javascript - 如何在 HTML5 中拖动时更改光标图标?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30052111/