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Complete sample code sharing for developing JavaScript components

黄舟Original: 2017-03-18 15:00:031373browse

Use JavaScript to build components according to Object-oriented ideas.

Now take building a TAB component as an example.

Functionally speaking, components include visual parts and logical control parts; from code structure speaking, components include code parts and resource parts (styles, pictures, etc.).

Features of components: high cohesion, low coupling (does not intersect with other code logic, can be inherited and included); encapsulation (hide private methods and variables); reusability (can be used repeatedly, used to assemble more complex applications).

<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>JS 组件</title>
<style>
.TabControl{
	position:absolute;

}

.TabControl .tab-head{
	height:22px;width:100%;
/*	border-left: solid 0px #e0e0e0;border-right: solid 0px #e0e0e0;border-top: solid 0px #e0e0e0;border-bottom: solid 1px #e0e0e0; */
	position:absolute;
	z-index:9;
}

.TabControl ul{
	position:absolute;
	top:2px;
	padding:0px;
	margin:0px;
	z-index:10;
}

.TabControl li{
	list-style:none; /* 将默认的列表符号去掉 */
	padding-left:10px;  padding-right:10px;
	margin:0; 
	float:left;
	border: solid 1px #e0e0e0;
	background-color:#ffffff;	
	height:20px;
	cursor:default;
}

.TabControl  li.selected{
	border-bottom: solid 1px #ffffff;border-top: solid 1px #ff0000;
	z-index:10;	
}

.TabControl li.unselected{
	border-bottom: solid 1px #e0e0e0;border-top: solid 1px #e0e0e0;
	z-index:10;	
}


.TabControl  .pageSelected{
	position:absolute;
	display:block;
	border: solid 1px #e0e0e0; 
	width:100%;height:100%;
	z-index:1;
	top:23px;
}

.TabControl .pageUnSelected{
	display:none;
	border: solid 1px #e0e0e0; 
	width:100%;height:100%;
	z-index:1;
	top:23px;	
}
</style>
</head>

<body>
<script lang="javascript">
	var TabControl = function(width, height){
		var me = this;
		
		//TAB控件容器，头，列表
		var cbody,tabHead, ul;	
		
		//最后选中的TAB页
		var lastSelectedPage = 0;
		
		//TAB页管理容器
		var pages = [];		
		

		/**
		 * 初始化函数
		 * param{tabCount}, 创建tab页的个数
		 */
		me.init = function(tabCount){
			//创建TAB容器
			cbody = document.createElement("p");
			cbody.className = "TabControl";
			cbody.style.width = width || "400px";
			cbody.style.height = height || "300px";

		    //创建TAB控件头
			tabHead= document.createElement("p");
			tabHead.className = "tab-head";
			cbody.appendChild(tabHead);
			
			//创建TAB头
			ul = document.createElement("UL");
			tabHead.appendChild(ul);
		
			//根据参数初始化TAB页，缺省创建2个TAB页
			var tc = tabCount ||  2;
			
			for(var i=0;i<tc;i++){
				me.insertPage(i,"tabPage" + i) 
			}
			
			//缺省选中第一页
			me.selectPage(0); 
		}
		
		/**
		 * 插入TAB页
		 * param{idx},插入位置
		 * param{title},TAB页标题
		 *
		 */
		me.insertPage = function(idx,title){
			if(parseInt(idx)>=0){
			 	var li = document.createElement("LI");
			 	li.className = "unselected";
			 	li.innerText = title;
			 	var chd = ul.childNodes[idx];
			 	ul.insertBefore(li);
			 	li.onclick = function(){
			 		me.selectPage(getSelectedIndex(li));
			 	}
			 	
			 	
			 	//创建page
			 	var page = document.createElement("p");
			 	page.className = "pageUnSelected";
			 	pages.push(page);
			 	cbody.appendChild(page);
			 }			
		}
		
		/*
		 * 内部函数
		 * 根据选中的对象，获取对应的TAB页索引
		 */
		function getSelectedIndex(li){
			var chd = ul.childNodes;
			for(var i=0;i<chd.length;i++){
				if(chd[i] == li){
					return i;
				}
			}
		}
		
		
		/**
		 * 选中某页
		 * param{idx},选中页的索引
		 */
		me.selectPage  = function(idx){
			if(parseInt(idx)>=0){				
				var lis = ul.childNodes;

				alert(lastSelectedPage + &#39;,&#39; + idx);
				lis[lastSelectedPage].className = "unselected";	
				lis[idx].className  = "selected";

/*
				
				for(var i=0;i<lis.length;i++){
					if( i== idx){
						lis[i].className  = "selected";
					} else{
						alert(&#39;B:&#39;+ i + &#39;,&#39;  + lis[idx].innerText);
						lis[i].className  = "unselected";
					}

				}
*/						
				
				//隐藏无需显示的TAB页，显示选中的TAB页
				pages[lastSelectedPage].className = "pageUnSelected";	
				pages[idx].className = "pageSelected";	
	
				lastSelectedPage = idx;
			}

		}
		
		//在函数尾部调用初始化函数执行初始化
		me.init();
	
	    //最后返回DOM对象
		return  cbody;
	}


	var tabControl = new TabControl();
	document.body.appendChild(tabControl);	
</script>
</body>

</html>

The final effect is as shown below:

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