本文實例講述了javascript實現行拖動的方法。分享給大家供大家參考。具體如下：
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>行拖動</title>
<script>
window.onload = function(){
//綁定事件
var addEvent = document.addEventListener ? function(el,type,callback){
el.addEventListener( type, callback, !1 );
} : function(el,type,callback){
el.attachEvent( "on" + type, callback );
}
//判定對樣式的支持
var getStyleName= (function(){
var prefixes = ['', '-ms-','-moz-', '-webkit-', '-khtml-', '-o-'];
var reg_cap = /-([a-z])/g;
function getStyleName(css, el) {
el = el || document.documentElement;
var style = el.style,test;
for (var i=0, l=prefixes.length; i < l; i++) {
test = (prefixes[i] + css).replace(reg_cap,function($0,$1){
return $1.toUpperCase();
});
if(test in style){
return test;
}
}
return null;
}
return getStyleName;
})();
var userSelect = getStyleName("user-select");
//精確獲取樣式
var getStyle = document.defaultView ? function(el,style){
return document.defaultView.getComputedStyle(el, null).getPropertyValue(style)
} : function(el,style){
style = style.replace(/\-(\w)/g, function($, $1){
return $1.toUpperCase();
});
return el.currentStyle[style];
}
var dragManager = {
y:0,
dragStart:function(e){
e = e || event;
var handler = e.target || e.srcElement;
if(handler.nodeName === "TD"){
handler = handler.parentNode;
dragManager.handler = handler;
if(!handler.getAttribute("data-background")){
handler.setAttribute("data-background",getStyle(handler,"background-color"))
}
//顯示為可移動的狀態
handler.style.backgroundColor = "#ccc";
handler.style.cursor = "move";
dragManager.y = e.clientY;
if(typeof userSelect === "string"){
return document.documentElement.style[userSelect] = "none";
}
document.unselectable = "on";
document.onselectstart = function(){
return false;
}
}
},
draging:function(e){//mousemove時拖動行
var handler = dragManager.handler;
if(handler){
e = e || event;
var y = e.clientY;
var down = y > dragManager.y;//是否向下移動
var tr = document.elementFromPoint(e.clientX,e.clientY);
if(tr && tr.nodeName == "TD"){
tr = tr.parentNode
dragManager.y = y;
if( handler !== tr){
tr.parentNode.insertBefore(handler, (down ? tr.nextSibling : tr));
}
};
}
},
dragEnd:function(){
var handler = dragManager.handler
if (handler) {
handler.style.backgroundColor = handler.getAttribute("data-background");
handler.style.cursor = "default";
dragManager.handler = null;
}
if(typeof userSelect === "string"){
return document.documentElement.style[userSelect] = "text";
}
document.unselectable = "off";
document.onselectstart = null;
},
main:function(el){
addEvent(el,"mousedown",dragManager.dragStart);
addEvent(document,"mousemove",dragManager.draging);
addEvent(document,"mouseup",dragManager.dragEnd);
}
}
var el = document.getElementById("table");
dragManager.main(el);
}
</script>
<style>
.table{width:60%;border: 1px solid red;border-collapse: collapse;}
.table td{border: 1px solid red;height: 20px;}
</style>
</head>
<body>
<h1>行拖動</h1>
<table id="table" class="table">
<tbody>
<tr><td>1</td><td>One</td><td>dom.require</td></tr>
<tr id="2" ><td class="2">2</td><td>Two</td><td>ControlJS </td></tr>
<tr id="3" ><td class="3">3</td><td>Three</td><td>HeadJS</td></tr>
<tr id="4" ><td class="4">4</td><td>Four</td><td>LAB.js</td></tr>
<tr id="5" ><td class="5">5</td><td>Five</td><td>$script.js</td></tr>
<tr id="6" ><td class="6">6</td><td>Six</td><td>NBL.js</td></tr>
</tbody>
</table>
</body>
</html>
希望本文所述對大家的javascript程序設計有所幫助。