jquery实现拖动效果（代码分享）
程序员文章站
2022-06-01 15:00:53
话不多说，请看代码：
话不多说，请看代码：
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>document</title>
</head>
<body>
<style type="text/css">
.page{text-align:left;}
.dragdiv{border:1px solid #ddd; padding:10px; width:300px; margin:0 auto; border-radius:4px; box-shadow:0 1px 2px #fefefe; position: fixed;}
</style>
<div class="dragdiv" id="drag">
<div class="drag-head">自己动手试试</div>
<div class="drag-body">
点击鼠标拖拖看
</div>
</div>
</body>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script>
var _drag = {};
_drag.top = 0; //拖动过的位置距离上边
_drag.left = 0; //拖动过的位置距离左边
_drag.maxleft; //距离左边最大的距离
_drag.maxtop; //距离上边最大的距离
_drag.dragging = false; //是否拖动标志
//拖动函数
function binddrag(el){
var winwidth = $(window).width(), winheight =$(window).height(),objwidth = $(el).outerwidth(), objheight = $(el).outerheight();
_drag.maxleft = winwidth - objwidth, _drag.maxtop = winheight - objheight;
var els = el.style,x=0,y=0;
var objtop = $(el).offset().top, objleft = $(el).offset().left;
$(el).mousedown(function(e){
_drag.dragging = true;
_drag.isdragged = true;
x = e.clientx - el.offsetleft;
y = e.clienty - el.offsettop;
el.setcapture && el.setcapture();
$(document).bind('mousemove',mousemove).bind('mouseup',mouseup);
return false;
});
function mousemove(e){
e = e || window.event;
if(_drag.dragging){
_drag.top = e.clienty - y;
_drag.left = e.clientx - x;
_drag.top = _drag.top > _drag.maxtop ? _drag.maxtop : _drag.top;
_drag.left = _drag.left > _drag.maxleft ? _drag.maxleft : _drag.left;
_drag.top = _drag.top < 0 ? 0 : _drag.top;
_drag.left = _drag.left <0 ? 0 : _drag.left;
els.top = _drag.top + 'px';
els.left = _drag.left+ 'px';
return false;
}
}
function mouseup(e){
_drag.dragging = false;
el.releasecapture && el.releasecapture();
e.cancelbubble = true;
$(document).unbind('mousemove',mousemove).unbind('mouseup',mouseup);
}
$(window).resize(function(){
var winwidth = $(window).width(),
winheight = $(window).height(),
el = $(el),
elwidth = el.outerwidth(),
elheight = el.outerheight(),
elleft = parsefloat(el.css('left')),
eltop = parsefloat(el.css('top'));
_drag.maxleft = winwidth - elwidth;
_drag.maxtop = winheight - elheight;
_drag.top = _drag.maxtop < eltop ? _drag.maxtop : eltop;
_drag.left = _drag.maxleft < elleft ? _drag.maxleft : elleft;
el.css({
top:_drag.top,
left:_drag.left
})
})
}
binddrag(document.getelementbyid('drag'));
</script>
</html>
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