javascript實現行拖動的方法

2024-05-06 16:20:56

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這篇文章主要介紹了javascript實現行拖動的方法,涉及javascript鼠標事件及頁面元素的相關操作技巧,需要的朋友可以參考下

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>