我要评论一、纯html+css+js实现；
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>document</title>
</head>
<body>
<div id="draggabledialog">
<div class="dialog-header">弹框标题</div>
<div class="dialog-content">弹框内容</div>
</div>
</body>
<style>
#draggabledialog {
position: absolute;
width: 300px;
height: 200px;
background-color: #fff;
border: 1px solid #ccc;
padding: 10px;
}
.dialog-header {
cursor: move;
background-color: #f0f0f0;
padding: 5px;
}
</style>
<script>
const dialog = document.getelementbyid('draggabledialog');
const dialogheader = dialog.queryselector('.dialog-header');
let isdragging = false;
let offsetx, offsety;
dialogheader.addeventlistener('mousedown', (e) => {
isdragging = true;
offsetx = e.clientx - dialog.offsetleft;
offsety = e.clienty - dialog.offsettop;
});
document.addeventlistener('mousemove', (e) => {
if (isdragging) {
dialog.style.left = e.clientx - offsetx + 'px';
dialog.style.top = e.clienty - offsety + 'px';
}
});
document.addeventlistener('mouseup', () => {
isdragging = false;
});
</script>
</html>
实现原理：使用js事件监听，监听document全局dom的鼠标移动事件，当触发事件后，目标元素将会随鼠标一起偏移(移动)相对应的距离；因目标元素并非一直需要跟随鼠标移动，于是通过给目标元素指定区域
dialogheader添加鼠标按下事件配合isdragging控制阀，实现只有当鼠标在指定区域按下才能实现拖动目标元素的效果。
二、vue模板实现；
<template>
<div id="draggabledialog" ref="dialog">
<div class="dialog-header" @mousedown="startdrag($event)">弹框标题</div>
<div class="dialog-content">弹框内容</div>
</div>
</template>
<script>
export default {
data() {
return {
isdragging: false,
offsetx: 0,
offsety: 0
};
},
methods: {
startdrag(event) {
this.isdragging = true;
this.offsetx = event.clientx - this.$refs.dialog.offsetleft;
this.offsety = event.clienty - this.$refs.dialog.offsettop;
document.addeventlistener('mousemove', this.drag);
document.addeventlistener('mouseup', this.stopdrag);
},
drag(event) {
if (this.isdragging) {
this.$refs.dialog.style.left = event.clientx - this.offsetx + 'px';
this.$refs.dialog.style.top = event.clienty - this.offsety + 'px';
}
},
stopdrag() {
this.isdragging = false;
document.removeeventlistener('mousemove', this.drag);
document.removeeventlistener('mouseup', this.stopdrag);
}
}
};
</script>
<style>
#draggabledialog {
position: absolute;
width: 300px;
height: 200px;
background-color: #fff;
border: 1px solid #ccc;
padding: 10px;
}
.dialog-header {
cursor: move;
background-color: #f0f0f0;
padding: 5px;
}
</style>
原理同上；
三、vue全局指令实现；
vue.directive('drag', {
bind(el) {
el.onmousedown = function(e) {
let disx = e.clientx - el.offsetleft;
let disy = e.clienty - el.offsettop;
document.onmousemove = function(e) {
let left = e.clientx - disx;
let top = e.clienty - disy;
if (left < 0) left = 0;
if (top < 0) top = 0;
if (left > document.documentelement.clientwidth - el.offsetwidth) left = document.documentelement.clientwidth - el.offsetwidth;
if (top > document.documentelement.clientheight - el.offsetheight) top = document.documentelement.clientheight - el.offsetheight;
el.style.left = left + 'px';
el.style.top = top + 'px';
};
document.onmouseup = function() {
document.onmousemove = null;
document.onmouseup = null;
};
};
}
});总结
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