重新整理了一篇自己寫過的一個jquery拖動程式碼,精簡了一些東西。
實現以下目標:
1.支援自適應(縮放時,不會看不到,始終會在視窗內,記錄位置)
2.拖動的元素不會拖到外面去(保持始終可見)
3.相容IE瀏覽器,使用流暢
html程式碼:
<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">點選拖動</div>
<div class="drag-body">
蔡寶堅部落格專注於前端開發,歡迎關注和收藏。<br/>
微博:<a href="http://weibo.com/kujian" target="_blank">http://weibo.com/kujian</a><br/>
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</div>
</div>
jQuery程式碼:
var _drag = {};
_drag.top = 0; //拖動過的位置距離上邊
_drag.left = 0; //拖動過的位置距離左邊
_drag.maxLeft; //距離左邊最大的距離
_drag.maxTop; //距離上邊最大的距離
_drag.dragging = false; //是否拖動標誌
//拖動函式
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:
原文:http://caibaojian.com/jquery-drag.html
PS:該專欄以後會不定期同步前端開發部落格上的文章過來,歡迎大家關注,也感謝sf這麼一個平臺,希望和你們一起進步。