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我在製作sticky note system，我希望粘滯便箋可以通過javascript拖動。我在這個site上找到了一個拖放腳本，這對我來說非常有用。但是我在粘滯便箋div裏面有一個「拖拽欄」，它應該是唯一可以拖動特定粘滯便箋的地方。我只拖動了光標所點擊的腳本，我希望它拖動「.dragbar」div的父元素「.parent」。使用Javascript進行拖放
現在，當您點擊.parent時，腳本被設置爲拖動.parent。如何在此代碼中選擇「.dragbar」的父級「div」？
如果我讓腳本選擇.dragbar，它只是在.parent內移動拖動條。注意：腳本是原始代碼，只是第87和95行中的選擇器名稱從「拖動」更改爲「父級」。
<!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>
我不會使用包含註釋的代碼，例如「IE被延遲」。這樣的評論意味着一個編碼人員顯然與「高級瀏覽器」的「奢侈」生活了很長時間，並且永遠不會意識到IE9和IE10正在取得的進展。考慮到編碼器，然後繼續使用「innerHTML」 - 微軟發明的一個屬性（！） - 他/她變成了一個完整的僞君子。也就是說，我不使用其他人的代碼，我自己寫代碼XD –
我自己完全沒有對IE的反對，並且我非常喜歡它，因爲它在IE8和IE9中的最新進展。我想我只是忘記了這個評論，但我不會寬恕使用這種語言的任何形式的談話。謝謝閱讀！ – jcrowley
我並沒有真正批評你，更多的是首先編寫代碼的人。 –