本文实例为大家分享了JS面向对象之多选框实现代码，供大家参考，具体内容如下

描述：

JS面向对象——多选框的实现

效果：

实现：

Utile.js

(function () { Object.prototype.addProto=function (sourceObj) { var names=Object.getOwnPropertyNames(sourceObj); for(var i=0;i<names.length;i++){ var desc=Object.getOwnPropertyDescriptor(sourceObj,names[i]); if(typeof desc.value==="object" && desc.value!==null){ var obj=new desc.value.constructor(); obj.addProto(desc.value);//把obj当成引用对象带入递归函数继续给obj赋值 Object.defineProperty(this,names[i],{ enumerable:desc.enumerable, writable:desc.writable, configurable:desc.configurable, value:obj }); continue; } Object.defineProperty(this,names[i],desc); } return this; }; Function.prototype.extendClass=function (supClass) { function F() {} F.prototype=supClass.prototype; this.prototype=new F(); this.prototype.constructor=this; this.supClass=supClass.prototype; if(supClass.prototype.constructor===Object.prototype.constructor){ supClass.prototype.constructor=supClass; } }})();var RES=(function () { var list={}; return { DATA_FINISH_EVENT:"data_finish_event", init:function (imgDataList,basePath,type) { if(imgDataList.length===0) return; if(!type) type="json"; RES.imgDataList=imgDataList.reverse(); RES.basePath=basePath; RES.type=type; RES.ajax(basePath+imgDataList.pop()+"."+type) }, ajax:function (path) { var xhr=new XMLHttpRequest(); xhr.addEventListener("load",RES.loadHandler); xhr.open("GET",path); xhr.send(); }, loadHandler:function (e) { this.removeEventListener("load",RES.loadHandler); var key,obj; if(RES.type==="json"){ obj=JSON.parse(this.response); key=obj.meta.image.split(".png")[0]; list[key]=obj.frames; }else if(RES.type==="xml"){ obj=this.responseXML.children[0]; key=obj.getAttribute("imagePath").split(".png")[0]; list[key]=obj; } if(RES.imgDataList.length===0){ var evt=new Event(RES.DATA_FINISH_EVENT); evt.list=list; document.dispatchEvent(evt); // Model.instance.menuData=list; return; } RES.ajax(RES.basePath+RES.imgDataList.pop()+"."+RES.type); }, getNameJSONData:function (name) { var fileName=RES.basePath; for(var key in list){ var arr=list[key].filter(function (t) { return t.filename===name; }); if(arr.length>0){ fileName+=key+".png"; break; } } if(arr.length===0){ return false; }else{ return { file:fileName, w:arr[0].frame.w, h:arr[0].frame.h, x:arr[0].frame.x, y:arr[0].frame.y }; } }, getNameXMLData:function (name) { var fileName=RES.basePath; for(var key in list){ var elem=list[key].querySelector("[n="+name+"]"); if(elem){ fileName+=list[key].getAttribute("imagePath"); break; } } if(!elem) return false; return { file:fileName, w:elem.getAttribute("w"), h:elem.getAttribute("h"), x:elem.getAttribute("x"), y:elem.getAttribute("y") } }, getImage:function (name) { var obj; if(RES.type==="json"){ obj=RES.getNameJSONData(name); }else if(RES.type==="xml"){ obj=RES.getNameXMLData(name) } if(!obj)return; var div=document.createElement("div"); Object.assign(div.style,{ width:obj.w+"px", height:obj.h+"px", backgroundImage:"url("+obj.file+")", backgroundPositionX:-obj.x+"px", backgroundPositionY:-obj.y+"px", position:"absolute" }); return div; }, changeImg:function (elem,name) { var obj; if(RES.type==="json"){ obj=RES.getNameJSONData(name); }else if(RES.type==="xml"){ obj=RES.getNameXMLData(name) } if(!obj)return; Object.assign(elem.style,{ width:obj.w+"px", height:obj.h+"px", backgroundImage:"url("+obj.file+")", backgroundPositionX:-obj.x+"px", backgroundPositionY:-obj.y+"px", position:"absolute" }); } }})();

UIComponent.js

var CheckBox=(function () { function CheckBox(parent) { this.checkView=this.init(parent); } CheckBox.prototype.addProto({ _label:"", _checked:false, init:function (parent) { if(this.checkView) return this.checkView; var div=document.createElement("div"); var icon=RES.getImage("f-checkbox"); div.appendChild(icon); var label=document.createElement("span"); div.style.position=icon.style.position=label.style.position="relative"; icon.style.float=label.style.float="left"; label.textContent=""; Object.assign(label.style,{ fontSize:"16px", lineHeight:"20px", marginLeft:"5px", marginRight:"10px" }); var h=RES.getNameXMLData("f-checkbox").h; icon.style.top=(20-h)/2+"px"; div.appendChild(label); parent.appendChild(div); this.clickHandlerBind=this.clickHandler.bind(this); div.addEventListener("click",this.clickHandlerBind); return div; }, clickHandler:function (e) { this.checked=!this.checked; }, set label(value){ this._label=value; this.checkView.lastElementChild.textContent=value; }, get label(){ return this._label; }, set checked(value){ if(this._checked===value)return; this._checked=value; if(value){ RES.changeImg(this.checkView.firstElementChild,"f-checkbox-active"); }else{ RES.changeImg(this.checkView.firstElementChild,"f-checkbox"); } this.checkView.firstElementChild.style.position="relative"; this.dispatchMessage(value); }, dispatchMessage:function (value) { var evt=new Event("change"); evt.checked=value; evt.elem=this; document.dispatchEvent(evt); }, get checked(){ return this._checked; } }); return CheckBox;})(); var Radio=(function () { function Radio(parent,groupName) { this.constructor.supClass.constructor.call(this,parent); this.groupName=groupName; this.checkView.self=this; this.checkView.setAttribute("groupName",groupName); } Radio.extendClass(CheckBox); Radio.prototype.addProto({ clickHandler:function (e) { // console.log(Model.instance.menuData); if(this.checked)return; var list=document.querySelectorAll("[groupName="+this.groupName+"]"); for(var i=0;i<list.length;i++){ list[i].self.checked=false; } this.checked=true; }, dispatchMessage:function (value) { if(!value)return; this.constructor.supClass.dispatchMessage.call(this,value); } }); return Radio;})();

html

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <script src="js/Utile.js"></script> <script src="js/UIComponent.js"></script></head><body> <script> document.addEventListener(RES.DATA_FINISH_EVENT,init); RES.init(["new_icon"],"img/","xml"); function init() { var elem=document.createDocumentFragment(); document.addEventListener("change",changeHandler); var check=new CheckBox(elem); check.checked=true; check.label="男"; var check1=new CheckBox(elem); check1.label="女"; document.body.appendChild(elem); } function changeHandler(e) { console.log(e); } </script></body></html>

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