拖拽
原 javascript读完大概需要9分钟
- 发布时间：2017-10-02 17:05 星期一
- 刘伟波
- 244
- 更新于： 2017-10-02 17:05 星期一
1.手机端拖拽
<div id="div" style="width:100px;height:100px;background-color:red;position:absolute;"></div>
<script>
var div = document.getElementById('div');
var oStyle = div.currentStyle? div.currentStyle : window.getComputedStyle(div, null);
div.addEventListener('touchmove', function(event) {
event.preventDefault();//阻止其他事件
// 如果这个元素的位置内只有一个手指的话
if (event.targetTouches.length == 1) {
var touch = event.targetTouches[0]; // 把元素放在手指所在的位置
div.style.left = touch.pageX -parseInt(oStyle.width)/2+ 'px';
div.style.top = touch.pageY -parseInt(oStyle.height)/2+ 'px';
}
}, false);
</script>
2.pc端
<style type="text/css">
#box{position:absolute; left:100px; top:100px; padding:5px; background:#f0f3f9; font-size:12px; -moz-box-shadow:2px 2px 4px #666666; -webkit-box-shadow:2px 2px 4px #666666;}
#main{border:1px solid #a0b3d6; background:white;}
#bar{line-height:24px; background:#beceeb; border-bottom:1px solid #a0b3d6; padding-left:5px; cursor:move;}
#content{width:420px; height:250px; padding:10px 5px;}
</style>
<div id="box">
<div id="main">
<div id="bar">拖拽</div>
<div id="content">
内容……
</div>
</div>
</div>
<script>
var params = {
left: 0,
top: 0,
currentX: 0,
currentY: 0,
flag: false
};
//获取相关CSS属性
var getCss = function(o,key){
return o.currentStyle? o.currentStyle[key] : document.defaultView.getComputedStyle(o,false)[key];
};
//拖拽的实现
var startDrag = function(bar, target, callback){
if(getCss(target, "left") !== "auto"){
params.left = getCss(target, "left");
}
if(getCss(target, "top") !== "auto"){
params.top = getCss(target, "top");
}
//o是移动对象
bar.onmousedown = function(event){
params.flag = true;
if(!event){
event = window.event;
//防止IE文字选中
bar.onselectstart = function(){
return false;
}
}
var e = event;
params.currentX = e.clientX;
params.currentY = e.clientY;
};
document.onmouseup = function(){
params.flag = false;
if(getCss(target, "left") !== "auto"){
params.left = getCss(target, "left");
}
if(getCss(target, "top") !== "auto"){
params.top = getCss(target, "top");
}
};
document.onmousemove = function(event){
var e = event ? event: window.event;
if(params.flag){
var nowX = e.clientX, nowY = e.clientY;
var disX = nowX - params.currentX, disY = nowY - params.currentY;
var _left=parseInt(params.left) + disX;
var _top=parseInt(params.top) + disY;
var _width=document.body.clientWidth-parseInt(getCss(target, "width"));
var _height=document.documentElement.clientHeight-parseInt(getCss(target, "height"));
//碰撞检测
_left<1 && (_left=0);
_left>_width && (_left=_width);
_top<1 && (_top=0);
_top>_height && (_top=_height);
target.style.left = _left+ "px";
target.style.top = _top + "px";
if (event.preventDefault) {
event.preventDefault();
}
return false;
}
if (typeof callback == "function") {
callback(parseInt(params.left) + disX, parseInt(params.top) + disY);
}
}
};
</script>
<script>
window.onload = function(){
var oBox = document.getElementById("command");
var oBar = document.getElementById("bar");
console.log(oBar)
startDrag(oBar, oBox);
};
</script>
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