javascript实现行拖动的方法

段干英杰

2023-03-14

本文向大家介绍javascript实现行拖动的方法，包括了javascript实现行拖动的方法的使用技巧和注意事项，需要的朋友参考一下

本文实例讲述了javascript实现行拖动的方法。分享给大家供大家参考。具体如下：

<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>行拖动</title>
<script>
 window.onload = function(){
 //绑定事件
 var addEvent = document.addEventListener ? function(el,type,callback){
  el.addEventListener( type, callback, !1 );
 } : function(el,type,callback){
  el.attachEvent( "on" + type, callback );
 }
 //判定对样式的支持
 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 $1.toUpperCase();
  });
  if(test in style){
  return test;
  }
  }
  return null;
  }
  return getStyleName;
 })();
 var userSelect = getStyleName("user-select");
 //精确获取样式
 var getStyle = document.defaultView ? function(el,style){
  return document.defaultView.getComputedStyle(el, null).getPropertyValue(style)
 } : function(el,style){
  style = style.replace(/\-(\w)/g, function($, $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"))
  }
  //显示为可移动的状态
  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时拖动行
  var handler = dragManager.handler;
  if(handler){
  e = e || event;
  var y = e.clientY;
  var down = y > dragManager.y;//是否向下移动
  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>行拖动</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>

希望本文所述对大家的javascript程序设计有所帮助。

javascript实现行拖动的方法

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