jquery的实操题（jQuery第二十八天练习）
jquery的实操题（jQuery第二十八天练习）
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width initial-scale=1.0">
<script src="js/jquery-3.4.1.min.js"></script>
<script src="js/jquery.easydrag.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('.one').click(function(){
$('.box').show();
});
$('span').click(function(){
$('.box').hide();
});
$('.box_all').easydrag();
});
</script>
<style type="text/css">
* {
padding:0; margin:0;
}
body { font-size:12px; padding:100px; }
.box_all { float:left; padding:5px; background:#eee; position:absolute; top:30%; left:30%;}
.box { width:500px; border:1px solid #4c7ebd; display:none; }
.box h1 { height:30px; line-height:30px; color:#fff; font-size:14px; background:#87b0e1; padding-left:10px; }
.box span { float:right; padding-right:10px; cursor:pointer;}
.box span a { display:block; height:30px; width:30px; background:url(images/close.jpg) no-repeat; text-indent:-9999px;}
.box span a:hover { background:url(images/close_hover.jpg) no-repeat;}
.box p { padding:10px; height:400px; background:#fff; border:3px solid #eee; }
.one { display:block;}
</style>
</head>
<body>
<a href="#" class="one">测试弹出层</a>
<div class="box_all">
<div class="box">
<h1><span><a href="#">关闭</a></span>这是标题</h1>
<p>这是内容</p>
</div>
</div>
</body>
</html>
jquery.easydrag.js
/**
* EasyDrag 1.5 - Drag & Drop jQuery Plug-in
*
* Thanks for the community that is helping the improvement
* of this little piece of code.
*
* For usage instructions please visit http://fromvega.com/scripts
*/
(function($){
// to track if the mouse button is pressed
var isMouseDown = false;
// to track the current element being dragged
var currentElement = null;
// callback holders
var dropCallbacks = {};
var dragCallbacks = {};
// bubbling status
var bubblings = {};
// global position records
var lastMouseX;
var lastMouseY;
var lastElemTop;
var lastElemLeft;
// track element dragStatus
var dragStatus = {};
// if user is holding any handle or not
var holdingHandler = false;
// returns the mouse (cursor) current position
$.getMousePosition = function(e){
var posx = 0;
var posy = 0;
if (!e) var e = window.event;
if (e.pageX || e.pageY) {
posx = e.pageX;
posy = e.pageY;
}
else if (e.clientX || e.clientY) {
posx = e.clientX document.body.scrollLeft document.documentElement.scrollLeft;
posy = e.clientY document.body.scrollTop document.documentElement.scrollTop;
}
return { 'x': posx 'y': posy };
};
// updates the position of the current element being dragged
$.updatePosition = function(e) {
var pos = $.getMousePosition(e);
var spanX = (pos.x - lastMouseX);
var spanY = (pos.y - lastMouseY);
$(currentElement).css("top" (lastElemTop spanY));
$(currentElement).css("left" (lastElemLeft spanX));
};
// when the mouse is moved while the mouse button is pressed
$(document).mousemove(function(e){
if(isMouseDown && dragStatus[currentElement.id] != 'false'){
// update the position and call the registered function
$.updatePosition(e);
if(dragCallbacks[currentElement.id] != undefined){
dragCallbacks[currentElement.id](e currentElement);
}
return false;
}
});
// when the mouse button is released
$(document).mouseup(function(e){
if(isMouseDown && dragStatus[currentElement.id] != 'false'){
isMouseDown = false;
if(dropCallbacks[currentElement.id] != undefined){
dropCallbacks[currentElement.id](e currentElement);
}
return false;
}
});
// register the function to be called while an element is being dragged
$.fn.ondrag = function(callback){
return this.each(function(){
dragCallbacks[this.id] = callback;
});
};
// register the function to be called when an element is dropped
$.fn.ondrop = function(callback){
return this.each(function(){
dropCallbacks[this.id] = callback;
});
};
// disable the dragging feature for the element
$.fn.dragOff = function(){
return this.each(function(){
dragStatus[this.id] = 'off';
});
};
// enable the dragging feature for the element
$.fn.dragOn = function(){
return this.each(function(){
dragStatus[this.id] = 'on';
});
};
// set a child element as a handler
$.fn.setHandler = function(handlerId){
return this.each(function(){
var draggable = this;
// enable event bubbling so the user can reach the handle
bubblings[this.id] = true;
// reset cursor style
$(draggable).css("cursor" "");
// set current drag status
dragStatus[draggable.id] = "handler";
// change handle cursor type
$("#" handlerId).css("cursor" "move");
// bind event handler
$("#" handlerId).mousedown(function(e){
holdingHandler = true;
$(draggable).trigger('mousedown' e);
});
// bind event handler
$("#" handlerId).mouseup(function(e){
holdingHandler = false;
});
});
}
// set an element as draggable - allowBubbling enables/disables event bubbling
$.fn.easydrag = function(allowBubbling){
return this.each(function(){
// if no id is defined assign a unique one
if(undefined == this.id || !this.id.length) this.id = "easydrag" (new Date().getTime());
// save event bubbling status
bubblings[this.id] = allowBubbling ? true : false;
// set dragStatus
dragStatus[this.id] = "on";
// change the mouse pointer
$(this).css("cursor" "move");
// when an element receives a mouse press
$(this).mousedown(function(e){
// just when "on" or "handler"
if((dragStatus[this.id] == "off") || (dragStatus[this.id] == "handler" && !holdingHandler))
return bubblings[this.id];
// set it as absolute positioned
$(this).css("position" "absolute");
// set z-index
$(this).css("z-index" parseInt( new Date().getTime()/1000 ));
// update track variables
isMouseDown = true;
currentElement = this;
// retrieve positioning properties
var pos = $.getMousePosition(e);
lastMouseX = pos.x;
lastMouseY = pos.y;
lastElemTop = this.offsetTop;
lastElemLeft = this.offsetLeft;
$.updatePosition(e);
return bubblings[this.id];
});
});
};
})(jQuery);
