JS面向对象——单选框的实现

  时间:2019-01-11
本文章向大家介绍JS面向对象——单选框的实现,主要包括JS面向对象——单选框的实现使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。

描述:

JS面向对象——单选框的实现

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);
    }
    /*
     //ES5 单例
    CheckBox.getInstance=function () {
        if(!CheckBox._instance){
            CheckBox._instance=new CheckBox();
        }
        return CheckBox._instance;
    };*/
    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/Model.js"></script>
    <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");
        var arr=["北京","上海","广州","深圳","成都"];

        function init() {
            document.addEventListener("change",changeHandler);
            var elem=document.createDocumentFragment();
            for(var i=0;i<arr.length;i++){
                var radio=new Radio(elem);
                radio.label=arr[i];
                if(i===0){
                    radio.checked=true;
                }
            }
            document.body.appendChild(elem);

        }

        function changeHandler(e) {
            console.log(e);
        }



        Model.instance.elem.addEventListener("chi",chiHandler);

        Model.instance.elem.dispatchEvent(new Event("chi"));

        function chiHandler(e) {
            console.log(e)
        }
    </script>
</body>
</html>

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原文地址:http://www.manongjc.com/article/42932.html