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首頁 > 編程 > JavaScript > 正文

javascript實現鼠標選取拖動或Ctrl選取拖動

2019-11-21 02:01:31

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<style>  *{position:absolute;}  #panel *{border:1px solid gray}  </style>  <script>  /**********判斷瀏覽器**********/  var isIE = false;  if(document.all) isIE = true;  /*******HashArray*******/     function HashArray(){      this.keyList = new Array();      this.put = function(key, value){        this[key] = value;        if(!this.containsKey(key)){          this.keyList.push(key);        }      }      this.size = function(){        return this.keyList.length;      }      this.containsKey = function(key){        if(this.keyList.length == 0) return false;        var keyStr = this.keyList.join(",") + ",";        if(keyStr.indexOf(key + ",") == -1){          return false;        }else{          return true;        }      }      this.get = function(key){        return this[key];      }      this.keySet = function(){        return this.keyList;      }      this.isEmpty = function(){        return this.keyList.length==0;      }      this.remove = function(key){        if(this.containsKey(key)){          delete this[key];          this.keyList.splice(this.getIndex(key), 1);        }      }      this.removeAll = function(key){        for(var i=0;i<this.keyList.length;i++){          delete this[this.keyList[i]];        }        this.keyList.length = 0;      }            this.getIndex = function(key){        for(var i=0;i<this.keyList.length;i++){          if(this.keyList[i] == key) return i;        }      }      this.toString = function(){        var str = "";        for(var i=0;i<this.keyList.length;i++){          str+= this.keyList[i] + ":" + this[this.keyList[i]].toString() + ",";        }        return str;      }   }  var dragArray = new HashArray();  /*********選中邊框變色********/  function selecting(obj){    if(obj.selected) obj.style.borderColor = "lime";    else obj.style.borderColor = "gray";  }  /*******拖動封裝類********/  function DragObject(obj){    this.oldX = 0;    this.oldY = 0;    this.isDraging = false;    this.dragObj = obj;    this.dragObj.style.position="absolute";    if(!this.dragObj.style.left) this.dragObj.style.left = 0;    if(!this.dragObj.style.top) this.dragObj.style.top = 0;        var theObj = this;    this.zIndex = 2;    obj.onmousedown = function(){ theObj.startDrag(); }    obj.onmousemove = function(){ theObj.drag(); }    obj.onmouseup = function(){ theObj.endDrag(); }    this.startDrag = function(){//alert(3)      DragObject.curObj = this;   //當前被拖動對象      this.isDrag = true;      this.oldX = event.x;      this.oldY = event.y;      this.dragObj.style.zIndex = this.zIndex++;    }        this.endDrag = function(){      this.isDrag = false;        }    this.drag = function(){      if(this.isDrag){        var x = window.event.x;        var y = window.event.y;                if(dragArray.containsKey(this.dragObj.id)){          for(var i=0;i<dragArray.keyList.length;i++){            var obj = dragArray[dragArray.keyList[i]];            obj.isOnDrag = true;            obj.style.left = parseInt(obj.style.left.replace("px","")) + (x - this.oldX);            obj.style.top = parseInt(obj.style.top.replace("px","")) + (y - this.oldY);          }        }        this.oldX = x;        this.oldY = y;      }    }  }  /*********拖動DIV********/  isMouseDown = false;  var originX,originY;  var isDrag = false;  function moveDiv(e){        if(DragObject.curObj) DragObject.curObj.drag();    if(isMouseDown && !isDrag){      var x,y;      if(document.all){        x = event.x;        y = event.y;      }else{        x = e.pageX;        y = e.pageY;      }      divMove.style.display="block";      divMove.style.width = Math.abs(x-originX) + "px";      divMove.style.height = Math.abs(y-originY) + "px";      if(x > originX){        divMove.style.left = originX+ "px";      }else divMove.style.left = (x-2)+ "px";            if(y > originY){        divMove.style.top = originY+ "px";      }else divMove.style.top = (y-2)+ "px";     }      }  /**********處理mousedown事件********/  function mousedown(e){    if(isIE){      if(event.srcElement.id == "panel"){        originX=event.x;        originY=event.y;        isMouseDown=true;      }else{        isDrag = true;      }    }else{      if(e.target.id == "panel"){        originX=e.pageX;        originY=e.pageY;        isMouseDown=true;      }else{        isDrag = true;      }    }  }  /**********處理mouseup事件********/  function mouseup(e){    if(isIE){      if(event.srcElement.id == "divMove" || event.srcElement.id == "panel"){        selectObjects();        isMouseDown=false;        divMove.style.display='none';      }else{        if(DragObject.curObj) DragObject.curObj.endDrag();        isDrag = false;      }    }else{      if(e.target.id == "divMove" || e.target.id == "panel"){        selectObjects();        isMouseDown=false;        divMove.style.display='none';      }else{        if(DragObject.curObj) DragObject.curObj.endDrag();        isDrag = false;      }    }  }  /*********選中對象********/  function selectObjects(){    for(var i=0;i<elems.length;i++){      var objX = elems[i].offsetLeft + elems[i].offsetWidth/2;      var objY = elems[i].offsetTop + elems[i].offsetWidth/2;      if(objX > divMove.offsetLeft && objX < divMove.offsetLeft + parseInt(divMove.style.width)  &&         objY > divMove.offsetTop && objY < divMove.offsetTop + parseInt(divMove.style.width)){        elems[i].selected = true;        dragArray.put(elems[i].id, elems[i]);        selecting(elems[i]);      }    }  }  /**********ID取對象********/  function $(){    if(document.getElementById){      return document.getElementById(arguments[0]);    }else{      return eval(arguments[0]);    }  }  </script>  <body onselectstart="return false;">  <div   class="iwvjtn8m0"   id="divMove" style="z-index:9999;display:none;border:1px solid lime;background:transparent;font-size:0px"></div>  <div   class="iwvjtn8m0"   id="panel" style="width:1024;height:768;background:#555555;left:0px;top:0px">  <input id="z" type="button" value="注 冊" style="top:200px;left:200px;">  <div   class="iwvjtn8m0"   id="d" style="width:150px;height:50px;top:100px;left:150px;">中國是一個發展中國家</div>  </div>  <script>  var divMove = $("divMove");  var elems = $("panel").children;  document.onmousemove=moveDiv;   document.onmousedown=mousedown;  document.onmouseup=mouseup;  for(var i=0;i<elems.length;i++){    with(elems[i]){      elems[i].dragObj = new DragObject(elems[i]);      elems[i].selected = false;      elems[i].isOnDrag = false;      onclick = function(){        if(this.selected){          if(!this.isOnDrag){            this.selected = !selected;            dragArray.remove(this.id);          }else{            this.isOnDrag = false;          }          }else if(dragArray.isEmpty() || event.ctrlKey){          this.selected = !selected;          dragArray.put(this.id, this);        }        selecting(this);      }    }  }  </script>  </body>

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