<!DOCTYPE html>
<html>
<head>
<title>frameSelect</title>
<style>
.fileDiv {display: inline-block; width: 100px; height: 100px; margin: 24px; border: 1px solid black; text-align: center; line-height: 100px;}
.selected {border: 1px solid red; color: red;}
</style>
<script>
(function() {
document.onmousedown = function () {
var selList = [];
// getElementByTagName返回带有指定标签名的对象的集合
var fileNodes = document.getElementsByTagName("div");
for(var i = 0; i < fileNodes.length; i++) {
// 返回数组中某个指定的元素位置
if (fileNodes[i].className.indexOf("fileDiv") != -1) {
fileNodes[i].className = "fileDiv";
selList.push(fileNodes[i]);
}
}
var isSelect = true;
// 获取事件触发后的event对象，做了一个兼容性处理
var evt = window.event || arguments[0];
// 存放鼠标点击初始位置
var startX = (evt.x || evt.clientX);
var startY = (evt.y || evt.clientY);
// 创建一个框选元素
var selDiv = document.createElement("div");
// 给框选元素添加CSS样式，使用决定定位
selDiv.style.cssText = "position:absolute; width:0px; height:0px; font-size:0px; margin:0px; padding:0px; border:1px dashed #0099FF; z-index:1000; filter:alpha(opacity:60); opacity:0.6; display:none";
// 添加ID
selDiv.id = "selectDiv";
// appendChild()向节点添加最后一个子节点
document.body.appendChild(selDiv);
// 根据起始位置，添加定位
selDiv.style.left = startX + "px";
selDiv.style.top = startY + "px";
// 根据坐标给选框修改样式
var _x = null;
var _y = null;
clearEventBubble(evt);
// 移动鼠标
document.onmousemove = function () {
evt = window.event || arguments[0];
if (isSelect) {
if (selDiv.style.display == "none") {
selDiv.style.display = "";
}
// 获取当前鼠标位置
_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'; //Math.abs()返回数的绝对值
selDiv.style.height = Math.abs(_y - startY) + 'px';
// *******************************************************************************
// 获取参数
var _l = selDiv.offsetLeft;
var _t = selDiv.offsetTop;
var _w = selDiv.offsetWidth;
var _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) {
// 该DOM元素被选中，进行处理
// indexOf()可返回某个指定的字符串值在字符串中首次出现的位置
if(selList[i].className.indexOf(" selected") == -1){
selList[i].className = selList[i].className + " selected";
}
}else{
if (selList[i].className.indexOf(" selected")!= -1) {
selList[i].className = "fileDiv";
}
}
}
}
clearEventBubble(evt);
}
// 放开鼠标，选框消失
document.onmouseup = function() {
isSelect = false;
if (selDiv) {
document.body.removeChild(selDiv);
}
selList = null, _x = null, _y = null, selDiv = null, startX = null, startY = null, evt = null;
}
}
})();
function clearEventBubble(evt) {
// stopPropagation()不再派发事件。终止事件在传播过程的捕获、目标处理或起跑阶段进一步传播
if (evt.stopPropagation)
evt.stopPropagation();
else
evt.cancelBubble = true; // 阻止该事件的进一步冒泡
if (evt.preventDefault)
evt.preventDefault(); // 取消事件的默认动作
else
evt.returnValue = false;
}
</script>
</head>
<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 ">flie6</div>
<div class="fileDiv ">file7</div>
<div class="fileDiv ">file8</div>
</body>
</html>
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