JavaScript简单实现鼠标拖动选择功能
JavaScript简单实现鼠标拖动选择功能
发布时间：2016-12-30 来源：查字典编辑
摘要：复制代码代码如下://Array.prototype.remove=function(item){for(vari=0;i

复制代码 代码如下:

<style><></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样式

_self.clearSelections(_regions);

this.className += " "+_self.selectedClass;

// 清空selected数组，并加入当前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;

}

// 判断一个区域是否在选择区内

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("共选择 "+arr.length+" 个文件，分别是：n"+selInfo);

}

// ]]></script>

<p><button>getRegions</button></p>

<div>file1</div>

<div>file2</div>

<div>file3</div>

<div>file4</div>

<div>file5</div>

<div>file6</div>

<div>file7</div>

<div>file8</div>

<div><button>getRegions</button></div>

<script type="text/javascript">// <![CDATA[

new RegionSelect({

region:'div.fileDiv',

selectedClass: 'seled'

}).select();

// ]]></script>

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