本篇文章主要是對JavaScript簡單實現鼠標拖動選擇功能的示例代碼進行了介紹，需要的朋友可以過來參考下，希望對大家有所幫助
代碼如下: <style><!-- body{padding-top:50px;padding-left:100px;padding-right:150px;} .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">// <![CDATA[ Array.prototype.remove = function( item ){ for( var i = 0 ; i < this.length ; i++ ){ if( item == this[i] ) break; } if( i == this.length ) return; for( var j = i ; j < this.length - 1 ; j++ ){ this[ j ] = this[ j + 1 ]; } this.length--; } String.prototype.replaceAll = function (AFindText,ARepText){ raRegExp = new RegExp(AFindText,"g"); return this.replace(raRegExp,ARepText);} function getAllChildren(e) { return e.all ? e.all : e.getElementsByTagName('*'); } document.getElementsBySelector = function(selector) { if (!document.getElementsByTagName) { return new Array(); } var tokens = selector.split(' '); var currentContext = new Array(document); for (var i = 0; i < tokens.length; i++) { token = tokens[i].replace(/^s+/,'').replace(/s+$/,'');; if (token.indexOf('#') > -1) { var bits = token.split('#'); var tagName = bits[0]; var id = bits[1]; var element = document.getElementById(id); if (tagName && element.nodeName.toLowerCase() != tagName) { return new Array(); } currentContext = new Array(element); continue; } if (token.indexOf('.') > -1) { var bits = token.split('.'); var tagName = bits[0]; var className = bits[1]; if (!tagName) { tagName = '*'; } var found = new Array; var foundCount = 0; for (var h = 0; h < currentContext.length; h++) { var elements; if (tagName == '*') { elements = getAllChildren(currentContext[h]); } else { elements = currentContext[h].getElementsByTagName(tagName); } for (var j = 0; j < elements.length; j++) { found[foundCount++] = elements[j]; } } currentContext = new Array; var currentContextIndex = 0; for (var k = 0; k < found.length; k++) { if (found[k].className && found[k].className.match(new RegExp('b'+className+'b'))) { currentContext[currentContextIndex++] = found[k]; } } continue; } if (token.match(/^(w*)[(w+)([=~|^$*]?)=?"?([^]"]*)"?]$/)) { var tagName = RegExp.$1; var attrName = RegExp.$2; var attrOperator = RegExp.$3; var attrValue = RegExp.$4; if (!tagName) { tagName = '*'; } var found = new Array; var foundCount = 0; for (var h = 0; h < currentContext.length; h++) { var elements; if (tagName == '*') { elements = getAllChildren(currentContext[h]); } else { elements = currentContext[h].getElementsByTagName(tagName); } for (var j = 0; j < elements.length; j++) { found[foundCount++] = elements[j]; } } currentContext = new Array; var currentContextIndex = 0; var checkFunction; switch (attrOperator) { case '=': checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); }; break; case '~': checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('b'+attrValue+'b'))); }; break; case '|': checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); }; break; case '^': checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); }; break; case '$': checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); }; break; case '*': checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); }; break; default : checkFunction = function(e) { return e.getAttribute(attrName); }; } currentContext = new Array; var currentContextIndex = 0; for (var k = 0; k < found.length; k++) { if (checkFunction(found[k])) { currentContext[currentContextIndex++] = found[k]; } } continue; } tagName = token; var found = new Array; var foundCount = 0; for (var h = 0; h < currentContext.length; h++) { var elements = currentContext[h].getElementsByTagName(tagName); for (var j = 0; j < elements.length; j++) { found[foundCount++] = elements[j]; } } currentContext = found; } return currentContext; } function addEvent(eventType,eventFunc,eventObj){ eventObj = eventObj || document; if(window.attachEvent) eventObj.attachEvent("on"+eventType,eventFunc); if(window.addEventListener) eventObj.addEventListener(eventType,eventFunc,false); } function clearEventBubble(evt){ evt = evt || window.event; if (evt.stopPropagation) evt.stopPropagation(); else evt.cancelBubble = true; if (evt.preventDefault) evt.preventDefault(); else evt.returnValue = false; } function posXY(event){ event = event || window.event; var posX = event.pageX || (event.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft)); var posY = event.pageY || (event.clientY + (document.documentElement.scrollTop || document.body.scrollTop)); return {x:posX, y:posY}; } var _selectedRegions = []; function RegionSelect(selRegionProp){ this.regions =[]; var _regions = document.getElementsBySelector(selRegionProp["region"]); if(_regions && _regions.length > 0){ var _self = this; for(var i=0; i< _regions.length;i++){ _regions[i].onmousedown = function(){ var evt = window.event || arguments[0]; if(!evt.shiftKey && !evt.ctrlKey){ // 清空所有select樣式 _self.clearSelections(_regions); this.className += " "+_self.selectedClass; // 清空selected數組，並加入當前select中的元素 _selectedRegions = []; _selectedRegions.push(this); }else{ if(this.className.indexOf(_self.selectedClass) == -1){ this.className += " "+_self.selectedClass; _selectedRegions.push(this); }else{ this.className = this.className.replaceAll(_self.selectedClass,""); _selectedRegions.remove(this); } } clearEventBubble(evt); } this.regions.push(_regions[i]); } } this.selectedClass = selRegionProp["selectedClass"]; this.selectedRegion = []; this.selectDiv = null; this.startX = null; this.startY = null; } RegionSelect.prototype.select = function(){ var _self = this; addEvent("mousedown",function(){ var evt = window.event || arguments[0]; _self.onBeforeSelect(evt); clearEventBubble(evt); },document); addEvent("mousemove",function(){ var evt = window.event || arguments[0]; _self.onSelect(evt); clearEventBubble(evt); },document); addEvent("mouseup",function(){ _self.onEnd(); },document); } RegionSelect.prototype.onBeforeSelect = function(evt){ if(!document.getElementById("selContainer")){ this.selectDiv = document.createElement("div"); this.selectDiv.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;"; this.selectDiv.id = "selContainer"; document.body.appendChild(this.selectDiv); }else{ this.selectDiv = document.getElementById("selContainer"); } this.startX = posXY(evt).x; this.startY = posXY(evt).y; this.isSelect = true; } RegionSelect.prototype.onSelect = function(evt){ var _self = this; if(_self.isSelect){ if(_self.selectDiv.style.display == "none") _self.selectDiv.style.display = ""; var posX = posXY(evt).x; var poxY = posXY(evt).y; _self.selectDiv.style.left = Math.min(posX, this.startX); _self.selectDiv.style.top = Math.min(poxY, this.startY); _self.selectDiv.style.width = Math.abs(posX - this.startX); _self.selectDiv.style.height = Math.abs(poxY - this.startY); var regionList = _self.regions; for(var i=0; i< regionList.length; i++){ var r = regionList[i], sr = _self.innerRegion(_self.selectDiv,r); if(sr && r.className.indexOf(_self.selectedClass) == -1){ r.className = r.className + " "+_self.selectedClass; _selectedRegions.push(r); }else if(!sr && r.className.indexOf(_self.selectedClass) != -1){ r.className = r.className.replaceAll(_self.selectedClass,""); _selectedRegions.remove(r); } } } } RegionSelect.prototype.onEnd = function(){ if(this.selectDiv){ this.selectDiv.style.display = "none"; } this.isSelect = false; //_selectedRegions = this.selectedRegion; } // 判斷一個區域是否在選擇區內 RegionSelect.prototype.innerRegion = function(selDiv, region){ var s_top = parseInt(selDiv.style.top); var s_left = parseInt(selDiv.style.left); var s_right = s_left + parseInt(selDiv.offsetWidth); var s_bottom = s_top + parseInt(selDiv.offsetHeight); var r_top = parseInt(region.offsetTop); var r_left = parseInt(region.offsetLeft); var r_right = r_left + parseInt(region.offsetWidth); var r_bottom = r_top + parseInt(region.offsetHeight); var t = Math.max(s_top, r_top); var r = Math.min(s_right, r_right); var b = Math.min(s_bottom, r_bottom); var l = Math.max(s_left, r_left); if (b > t+5 && r > l+5) { return region; } else { return null; } } RegionSelect.prototype.clearSelections = function(regions){ for(var i=0; i<regions.length;i++){ regions[i].className = regions[i].className.replaceAll(this.selectedClass,""); } } function getSelectedRegions(){ return _selectedRegions; } function showSelDiv(){ var selInfo = ""; var arr = getSelectedRegions(); for(var i=0; i<arr.length;i++){ selInfo += arr[i].innerHTML+"n"; } alert("共選擇 "+arr.length+" 個文件，分別是：n"+selInfo); } // ]]></script> <p><button onclick="showSelDiv();">getRegions</button></p> <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 style="float: left; width: 100%;"><button onclick="showSelDiv();">getRegions</button></div> <script type="text/javascript">// <![CDATA[ new RegionSelect({ region:'div.fileDiv', selectedClass: 'seled' }).select(); // ]]></script>