小编给大家分享一下JS如何实现多选框，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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);
}
/*
//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/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>
支付宝扫一扫
微信扫一扫
