最近不太忙，终于有时间，研究了一下早就想搞定的拖拽系列，先是写了面向过程式的，再做一个面向对象的，再顺便弄弄继承，最后玩一下ES6的class 不觉用了一天多，收获很大。拖拽弄完，想再弄一个拖放。 上代码：
函数式简单版：
<style type="text/css">
#div1 {
position: absolute;
height: 100px;
width: 100px;
background: #ccc;
}
</style> <div id="div1"> sdasd
</div> <p>sdfsfsdfsdfsz</p> <script>
var log = console.log.bind(this); ;(function(win, doc) { var drag = function(obj, options, callback) { obj.onmousedown = function(ev) { var oEvent = ev || window.event;
var disX = oEvent.offsetX;
var disY = oEvent.offsetY; doc.onmousemove = function(ev) { var oEvent = ev || window.event; var x = oEvent.clientX - disX;
var y = oEvent.clientY - disY; obj.style.left = x + 'px'; obj.style.top = y + 'px'; } doc.onmouseup = function() {
doc.onmousedown = null;
doc.onmousemove = null;
obj.releaseCapture && obj.releaseCapture();
} obj.setCapture && obj.setCapture();
return false; } }; win.drag = drag; })(window, document); var div1 = document.getElementById('div1'); drag(div1);
</script>
面向对象+继承:
<style type="text/css">
#div1 {
position: absolute;
height: 100px;
width: 100px;
background: #ccc;
} .drag_box {
height: 100px;
width: 100px;
background: rgb(254, 171, 121);
position: absolute;
}
</style>
<div id="div1">
sdasd
</div> <p>sdfsfsdfsdfsz
<br /> sdadas </p> <div class="drag_box">
多box拖拽 </div> <div class="drag_box">
多box拖拽 </div> <a href="javascript:;">dsadasd</a> <script>
var log = console.log.bind(this); ;
(function() { window.Drag = function Drag(cls) { this.obj = Array.prototype.slice.call(document.querySelectorAll(cls)); this.win_w = document.documentElement.clientWidth || document.body.clientWidth;
this.win_h = document.documentElement.clientHeight || document.body.clientHeight; } Drag.prototype.init = function(user_config) {
//默认参数
var defaults = {
isLimit: false,
isChangeIndex: false } this.config = this.extend(defaults, user_config); var _this = this;
for(var i = 0; i < this.obj.length; i++) { (function(i) {
_this.obj[i].onmousedown = function() {
this.disX;
this.disY;
var pos = document.defaultView.getComputedStyle(_this.obj[i], false).Position; if(!pos || pos.toLowerCase() == 'static') { _this.obj[i].style.position = 'absolute'
};
var e = e || window.event;
_this.mousedown(_this.obj[i], e);
return false } })(i); }
} Drag.prototype.extend = function(a, b) { for(var key in b) {
if(b.hasOwnProperty(key)) {
a[key] = b[key];
}
}
return a; } Drag.prototype.mousedown = function(ele, e) {
var _this = this; var e = e || window.event;
this.disX = e.offsetX;
this.disY = e.offsetY;
if(this.config.isChangeIndex) { for(var i = 0; i < this.obj.length; i++) { this.obj[i].style.zIndex = 'auto' } ele.style.zIndex = 100;
} document.onmousemove = function(e) {
var e = e || window.event;
_this.mousemove(ele, e); } document.onmouseup = function(e) { var e = e || window.event; _this.mouseup(ele, e) } } Drag.prototype.mousemove = function(ele, e) {
var l = e.clientX - this.disX;
var t = e.clientY - this.disY;
if(this.config.isLimit) { var w = this.win_w - ele.offsetWidth;
var h = this.win_h - ele.offsetHeight; ele.style.left = l <= 0 ? 0 : (l > w ? (w + 'px') : (l + 'px')); ele.style.top = t <= 0 ? 0 : (t >= h ? (h + 'px') : (t + 'px')); } else { ele.style.left = l + 'px';
ele.style.top = t + 'px'; } } Drag.prototype.mouseup = function(ele, e) { document.onmousedown = null;
document.onmousemove = null;
document.onmouseup = null;
if(this.config.isChangeIndex) {
ele.style.zIndex = 100;
} return false }; })(); //继承出LimitDrag
;
(function() { // 限制范围拖拽 window.LimitDrag = function LimitDrag(cls) { Drag.call(this, cls) } LimitDrag.prototype = new Drag(); LimitDrag.prototype.constructor = LimitDrag; //限制范围
LimitDrag.prototype.mousemove = function(ele, e) { var l = e.clientX - this.disX;
var t = e.clientY - this.disY;
var w = this.win_w - ele.offsetWidth;
var h = this.win_h - ele.offsetHeight; ele.style.left = l <= 0 ? 0 : (l > w ? (w + 'px') : (l + 'px')); ele.style.top = t <= 0 ? 0 : (t >= h ? (h + 'px') : (t + 'px')); ele.style.zIndex = 100; }
})(); window.onload = function() { new Drag('#div1').init({ }); new Drag('a').init({ }); new Drag('.drag_box').init({ isLimit: true,
isChangeIndex: true
}); new LimitDrag('p').init({ isLimit: true,
isChangeIndex: true
});
}
</script>
面向对象ES6：
<style type="text/css">
#div1 {
position: absolute;
height: 100px;
width: 100px;
background: #ccc;
} .drag_box {
height: 100px;
width: 100px;
background: rgb(254, 171, 121);
position: absolute;
}
</style>
<div id="div1">
sdasd
</div> <p>sdfsfsdfsdfsz
<br /> sdadas </p> <div class="drag_box">
多box拖拽 </div> <div class="drag_box" style="left: 300px;">
多box拖拽 </div> <script>
var log = console.log.bind(this); // es6 class class Drag { constructor(cls) { this.obj = document.querySelectorAll(cls);
this.win_w = document.documentElement.clientWidth || document.body.clientWidth;
this.win_h = document.documentElement.clientHeight || document.body.clientHeight; } init(user_config) { var defaults = { isLimit: false,
isChangeIndex: false
} this.config = this.extend(defaults, user_config); for(let i = 0; i < this.obj.length; i++) {
this.disX;
this.disY; this.obj[i].onmousedown = (e => {
var e = e || window.event;
this.mousedown(e, this.obj[i]);
})
}
} extend(a, b) { for(let attr in b) { if(b.hasOwnProperty(attr)) { a[attr] = b[attr] } } return a; } mousedown(e, ele) { this.disX = e.offsetX;
this.disY = e.offsetY;
var _this = this; var pos = document.defaultView.getComputedStyle(ele, false).Position; if(!pos || pos.toLowerCase() == 'static') { ele.style.position = 'absolute'
}; if(this.config.isChangeIndex) { for(let i = 0; i < this.obj.length; i++) { this.obj[i].style.zIndex = 'auto' } ele.style.zIndex = 100;
} document.onmousemove = function(e) {
var e = e || window.event;
_this.mousemove(e, ele);
return false
} document.onmouseup = function() { _this.mouseup(ele)
} } mousemove(e, ele) {
let l = e.clientX - this.disX;
let t = e.clientY - this.disY;
if(this.config.isLimit) { let w = this.win_w - ele.offsetWidth;
let h = this.win_h - ele.offsetHeight; ele.style.left = l <= 0 ? 0 : (l > w ? (w + 'px') : (l + 'px')); ele.style.top = t <= 0 ? 0 : (t >= h ? (h + 'px') : (t + 'px')); } else { ele.style.left = l + 'px';
ele.style.top = t + 'px'; } return false; } mouseup(ele) {
document.onmousedown = null;
document.onmousemove = null;
document.onmouseup = null;
if(this.config.isChangeIndex) {
ele.style.zIndex = 100;
}
return false;
} } class chixingDrag extends Drag { constructor(...arg) { super(...arg)
} mousemove(e, ele) { let l = e.clientX - this.disX;
let t = e.clientY - this.disY; if(this.config.isLimit) { let w = this.win_w - ele.offsetWidth;
let h = this.win_h - ele.offsetHeight; ele.style.left = l <= 50 ? 0 : (l > (w - 50) ? (w + 'px') : (l + 'px')); ele.style.top = t <= 50 ? 0 : (t >= (h - 50) ? (h + 'px') : (t + 'px')); } else { ele.style.left = l + 'px';
ele.style.top = t + 'px'; } return false; } } window.onload = function() { var drag1 = new Drag('#div1').init({ isLimit: true
}); new chixingDrag('.drag_box').init({ isLimit: true,
isChangeIndex: true
}); }
</script>
参数说明：
isLimit: true,//是否限制范围，默认false
isChangeIndex: true //是否改变z-index，默认false，也就是多文件拖拽的时候是否新挪动的在最上边。
tips:关于setCapture,releaseCapture不是很懂，说了为了兼容IE，这里的问题暂时不考虑了。