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我在制作sticky note system，我希望粘滞便笺可以通过javascript拖动。我在这个site上找到了一个拖放脚本，这对我来说非常有用。但是我在粘滞便笺div里面有一个“拖拽栏”，它应该是唯一可以拖动特定粘滞便笺的地方。我只拖动了光标所点击的脚本，我希望它拖动“.dragbar”div的父元素“.parent”。使用Javascript进行拖放
现在，当您点击.parent时，脚本被设置为拖动.parent。如何在此代码中选择“.dragbar”的父级“div”？
如果我让脚本选择.dragbar，它只是在.parent内移动拖动条。注意：脚本是原始代码，只是第87和95行中的选择器名称从“拖动”更改为“父级”。
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.pagecontent {
width:98%;
height:96%;
overflow:hidden;
background:lightyellow;
border:1px solid black;
padding:10px;
}
.parent {
position:relative;
height:300px;
width:300px;
background-color:gray;
border:1px solid black;
float:left;
margin:0 10px 0 0;
overflow:auto;
}
.dragbar {
height:50px;
width:300px;
background:lightgray;
cursor:move;
position:relative;
}
</style>
</head>
<body>
<div class="pagecontent">
<h1>Dragging Practice</h1>
<h3>Drag and drop the parent div by using the child dragbar</h3>
<pre id="debug">mouse up</pre>
<div class="parent">
<div class="dragbar">I am the Child, my class is .dragbar</div>I am the Parent, my class is
.parent</div>
<div class="parent">
<div class="dragbar">I am the Child, my class is .dragbar</div>I am the Parent, my class is
.parent</div>
<script language="JavaScript" type="text/javascript">
<!--
// this is simply a shortcut for the eyes and fingers
function $(id) {
return document.getElementById(id);
}
var _startX = 0; // mouse starting positions
var _startY = 0;
var _offsetX = 0; // current element offset
var _offsetY = 0;
var _dragElement; // needs to be passed from OnMouseDown to OnMouseMove
var _oldZIndex = 0; // we temporarily increase the z-index during drag
var _debug = $('debug'); // makes life easier
InitDragDrop();
function InitDragDrop() {
document.onmousedown = OnMouseDown;
document.onmouseup = OnMouseUp;
}
function OnMouseDown(e) {
// IE is retarded and doesn't pass the event object
if (e == null) e = window.event;
// IE uses srcElement, others use target
var target = e.target != null ? e.target : e.srcElement;
_debug.innerHTML = target.className == 'parent' //Selector
?
'draggable element clicked' : 'NON-draggable element clicked';
// for IE, left click == 1
// for Firefox, left click == 0
if ((e.button == 1 && window.event != null || e.button == 0) && target.className == 'parent') //Selector
{
// grab the mouse position
_startX = e.clientX;
_startY = e.clientY;
// grab the clicked element's position
_offsetX = ExtractNumber(target.style.left);
_offsetY = ExtractNumber(target.style.top);
// bring the clicked element to the front while it is being dragged
_oldZIndex = target.style.zIndex;
target.style.zIndex = 10000;
// we need to access the element in OnMouseMove
_dragElement = target;
// tell our code to start moving the element with the mouse
document.onmousemove = OnMouseMove;
// cancel out any text selections
document.body.focus();
// prevent text selection in IE
document.onselectstart = function() {
return false;
};
// prevent IE from trying to drag an image
target.ondragstart = function() {
return false;
};
// prevent text selection (except IE)
return false;
}
}
function ExtractNumber(value) {
var n = parseInt(value);
return n == null || isNaN(n) ? 0 : n;
}
function OnMouseMove(e) {
if (e == null) var e = window.event;
// this is the actual "drag code"
_dragElement.style.left = (_offsetX + e.clientX - _startX) + 'px';
_dragElement.style.top = (_offsetY + e.clientY - _startY) + 'px';
_debug.innerHTML = '(' + _dragElement.style.left + ', ' + _dragElement.style.top + ')';
}
function OnMouseUp(e) {
if (_dragElement != null) {
_dragElement.style.zIndex = _oldZIndex;
// we're done with these events until the next OnMouseDown
document.onmousemove = null;
document.onselectstart = null;
_dragElement.ondragstart = null;
// this is how we know we're not dragging
_dragElement = null;
_debug.innerHTML = 'mouse up';
}
}
//-->
</script>
</div>
</body>
</html>
我不会使用包含注释的代码，例如“IE被延迟”。这样的评论意味着一个编码人员显然与“高级浏览器”的“奢侈”生活了很长时间，并且永远不会意识到IE9和IE10正在取得的进展。考虑到编码器，然后继续使用“innerHTML” - 微软发明的一个属性（！） - 他/她变成了一个完整的伪君子。也就是说，我不使用其他人的代码，我自己写代码XD –
我自己完全没有对IE的反对，并且我非常喜欢它，因为它在IE8和IE9中的最新进展。我想我只是忘记了这个评论，但我不会宽恕使用这种语言的任何形式的谈话。谢谢阅读！ – jcrowley
我并没有真正批评你，更多的是首先编写代码的人。 –