js模拟电脑选择多文件夹效果_选区代码
2010-09-14 13:28:50 来源：WEB开发网按住鼠标键不动，拖动鼠标，会看到效果
运行可以看到效果
<html>
<head></head>
<style>
body{padding:100px;}
.fileDiv{float:left;width:100px;height:100px;text-align:center;line-height:100px;font-size:12px;border:1px solid #cccccc;margin-right:10px;margin-bottom:10px;}
.seled{border:1px solid #ff0000;background-color:#D6DFF7;}
</style>
<script type="text/javascript">
(function(){
document.xywxusedown = function(){
var selList = [];
var fileNodes = document.getElementsByTagName("div");
for(var i=0; i < fileNodes.length; i++){
if(fileNodes[i].className.indexOf("fileDiv")!=-1){
fileNodes[i].className = "fileDiv";
selList.push(fileNodes[i]);
}
}
var isSelect = true;
var evt = window.event || arguments[0];
var startX = (evt.x || evt.clientX);
var startY = (evt.y || evt.clientY);
var selDiv = document.createElement("div");
selDiv.style.cssText = "position:absolute;width:0px;height:0px;font-size:0px;margin:0px;padding:0px;border:1px dashed #0099FF;background-color:#C3D5ED;z-index:1000;filter:alpha(opacity:60);opacity:0.6;display:none;";
selDiv.id = "selectDiv";
document.body.appendChild(selDiv);
selDiv.style.left = startX +"px";
selDiv.style.top = startY +"px";
var _x = null;
var _y = null;
clearEventBubble(evt);
document.onmousemove = function(){
evt = window.event || arguments[0];
if(isSelect){
if(selDiv.style.display == "none"){ selDiv.style.display = "";}
_x = (evt.x || evt.clientX);
_y = (evt.y || evt.clientY);
selDiv.style.left = Math.min(_x, startX)+"px";
selDiv.style.top = Math.min(_y, startY) +"px";
selDiv.style.width = Math.abs(_x - startX) +"px";
selDiv.style.height = Math.abs(_y - startY)+"px";
// ---------------- 关键算法 ---------------------
var _l = selDiv.offsetLeft, _t = selDiv.offsetTop;
var _w = selDiv.offsetWidth, _h = selDiv.offsetHeight;
for(var i=0; i< selList.length; i++){
var sl = selList[i].offsetWidth + selList[i].offsetLeft;
var st = selList[i].offsetHeight + selList[i].offsetTop;
if(sl > _l && st > _t && selList[i].offsetLeft < _l+_w && selList[i].offsetTop < _t + _h){
if(selList[i].className.indexOf("seled") == -1){
selList[i].className = selList[i].className +" seled";
}
}else{
if(selList[i].className.indexOf("seled") != -1){
selList[i].className = "fileDiv";
}
}
}
}
clearEventBubble(evt);
}
document.onmouseup = function(){
isSelect = false;
if(selDiv){
document.body.removeChild(selDiv);
showSelDiv(selList);
}
selList = null,_x = null,_y = null,selDiv = null,startX = null,startY = null, evt = null;
}
}
})();
function clearEventBubble(evt){
if (evt.stopPropagation) evt.stopPropagation(); else evt.cancelBubble = true;
if (evt.preventDefault) evt.preventDefault(); else evt.returnValue = false;
}
//www.jb51.net 脚本之家
function showSelDiv(arr){
var count =0;
var selInfo = "";
for(var i=0; i<arr.length;i++){
if(arr[i].className.indexOf("seled")!=-1){
count ++;
selInfo += arr[i].innerHTML+"n";
}
}
alert("脚本之家共选择 "+count+" 个文件，分别是：n"+selInfo);
}
</script>
<body>
<div class="fileDiv">file1</div>
<div class="fileDiv">file2</div>
<div class="fileDiv">file3</div>
<div class="fileDiv">file4</div>
<div class="fileDiv">file5</div>
<div class="fileDiv">file6</div>
<div class="fileDiv">file7</div>
<div class="fileDiv">file8</div>
<div class="fileDiv">file9</div>
</body>
</html>
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