重新整理了一篇自己写过的一个jquery拖动代码,精简了一些东西。

实现以下目标:

1.支持自适应(缩放时,不会看不到,始终会在窗口内,记录位置)
2.拖动的元素不会拖到外面去(保持始终可见)
3.兼容IE浏览器,使用流畅

html代码:

<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">点击拖动</div>
    <div class="drag-body">
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    </div>
</div>

jQuery代码:

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'));

演示地址:

链接

原文:http://caibaojian.com/jquery-drag.html

PS:该专栏以后会不定期同步前端开发博客上的文章过来,欢迎大家关注,也感谢sf这么一个平台,希望和你们一起进步。


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