Detailed explanation of table operation classes implemented by JS (add, delete, sort, move up, move down)

Detailed explanation of table operation classes implemented by JS (add, delete, sort, move up, move down)_javascript skills

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Release： 2016-05-16 15:24:15

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The example in this article describes the table operation class implemented by JS. Share it with everyone for your reference, the details are as follows:

The screenshot of the running effect is as follows:

Click here to view Online Demo.

The specific code is as follows:

<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> 
<style type="text/css">*{font-size:14px}button{margin:3px}</style> 
<script type="text/javascript"> 
var mytable=null,mytable2=null; 
window.onload=function(){ 
mytable=new CTable("tbl",10); 
mytable2=new CTable("tbl2",6); 
} 
Array.prototype.each=function(f){for(var i=0;i<this.length;i++) f(this[i],i,this)} 
function $A(arrayLike){ 
for(var i=0,ret=[];i<arrayLike.length;i++) ret.push(arrayLike[i]); 
return ret 
} 
Function.prototype.bind = function() { 
 var __method = this, args = $A(arguments), object = args.shift(); 
 return function() { 
  return __method.apply(object, args.concat($A(arguments))); 
 } 
} 
function CTable(id,rows){ 
this.tbl=typeof(id)=="string"&#63;document.getElementById(id):id; 
if (rows && /^\d+$/.test(rows)) this.addrows(rows) 
} 
CTable.prototype={ 
addrows:function(n){ //随机添加n个tr 
new Array(n).each(this.add.bind(this)) 
}, 
add:function(){ //添加1个tr 
var self=this; 
var tr = self.tbl.insertRow(-1),td1= tr.insertCell(-1),td2= tr.insertCell(-1),td3= tr.insertCell(-1); 
var chkbox=document.createElement("INPUT") 
chkbox.type="checkbox" 
chkbox.onclick=self.highlight.bind(self) 
td1.appendChild(chkbox) 
td1.setAttribute("width","35") 
td2.innerHTML=Math.ceil(Math.random()*99) 
td3.innerHTML=Math.ceil(Math.random()*99) 
}, 
del:function(){ //删除所选tr 
var self=this 
$A(self.tbl.rows).each(function(tr){if (self.getChkBox(tr).checked) tr.parentNode.removeChild(tr)}) 
}, 
up:function(){ //上移所选tr 
var self=this 
var upOne=function(tr){ //上移1个tr 
if (tr.rowIndex>0){ 
self.swapTr(tr,self.tbl.rows[tr.rowIndex-1]) 
self.getChkBox(tr).checked=true 
} 
} 
var arr=$A(self.tbl.rows).reverse() 
if (arr.length>0 && self.getChkBox(arr[arr.length-1]).checked){ 
for(var i=arr.length-1;i>=0;i--){ 
if (self.getChkBox(arr[i]).checked){ 
arr.pop()      
}else{ 
break 
} 
} 
} 
arr.reverse().each(function(tr){if (self.getChkBox(tr).checked) upOne(tr)}); 
}, 
down:function(){ 
var self=this 
var downOne=function(tr){    
if (tr.rowIndex<self.tbl.rows.length-1) { 
self.swapTr(tr,self.tbl.rows[tr.rowIndex+1]); 
self.getChkBox(tr).checked=true; 
} 
} 
var arr=$A(self.tbl.rows) 
if (arr.length>0 && self.getChkBox(arr[arr.length-1]).checked){ 
for(var i=arr.length-1;i>=0;i--){ 
if (self.getChkBox(arr[i]).checked){ 
arr.pop() 
}else{ 
break 
} 
} 
} 
arr.reverse().each(function(tr){if (self.getChkBox(tr).checked) downOne(tr)}); 
}, 
sort:function(){ //排序  
var self=this,order=arguments[0]; 
var sortBy=function(a,b){ 
if (typeof(order)=="number"){ //数字,则按数字指示的列排序 
return Number(a.cells[order].innerHTML)>=Number(b.cells[order].innerHTML)&#63;1:-1;  //转化为数字类型比较大小 
}else if (typeof(order)=="function"){ //为程序,按 程序的返回结果排序 
return order(a,b); 
}else{ 
return 1; 
} 
} 
$A(self.tbl.rows).sort(sortBy).each(function(x){ 
var checkStatus=self.getChkBox(x).checked; 
self.tbl.firstChild.appendChild(x); 
if (checkStatus) self.getChkBox(x).checked=checkStatus; 
}); 
}, 
rnd:function(){ //随即选择几行tr 
var self=this,selmax=0,tbl=self.tbl; 
if (tbl.rows.length){ 
 selmax=Math.max(Math.ceil(tbl.rows.length/4),1); //选择的行数不超过tr数的1/4 
 $A(tbl.rows).each(function(x){ 
self.getChkBox(x).checked=false; 
self.restoreBgColor(x) 
}) 
}else{ 
return alert("无数据可以选") 
} 
new Array(selmax).each(function(){ 
var tr=tbl.rows[Math.floor(Math.random()*tbl.rows.length)] 
self.getChkBox(tr).checked=true; 
self.highlight({target:self.getChkBox(tr)}) 
}) 
}, 
highlight:function(){        //设置tr的背景色 
var self=this; 
var evt=arguments[0] || window.event 
var chkbox=evt.srcElement || evt.target 
var tr=chkbox.parentNode.parentNode 
chkbox.checked&#63;self.setBgColor(tr):self.restoreBgColor(tr) 
}, 
swapTr:function(tr1,tr2){       //交换tr1和tr2的位置 
var target=(tr1.rowIndex<tr2.rowIndex)&#63;tr2.nextSibling:tr2; 
var tBody=tr1.parentNode 
tBody.replaceChild(tr2,tr1); 
  tBody.insertBefore(tr1,target); 
}, 
getChkBox:function(tr){      //从tr得到 checkbox对象 
return tr.cells[0].firstChild 
}, 
restoreBgColor:function(tr){      
tr.style.backgroundColor="#ffffff" 
}, 
setBgColor:function(tr){ 
tr.style.backgroundColor="#c0c0c0" 
} 
} 
function f(a,b){ 
var sumRow=function(row){return Number(row.cells[1].innerHTML)+Number(row.cells[2].innerHTML)}; 
return sumRow(a)>sumRow(b)&#63;1:-1; 
} 
</script> 
</head> 
<body> 
<button onClick="javascript:mytable.rnd()">随机选择行</button> 
<button onClick="javascript:mytable.add()">添加一行</button> 
<button onClick="javascript:mytable.del()">删除选定行</button> 
<button onClick="javascript:mytable.up()">上移选定行</button> 
<button onClick="javascript:mytable.down()">下移选定行</button> 
<button onClick="javascript:mytable.sort(1)">按第一列数字排序</button> 
<button onClick="javascript:mytable.sort(f)">按每行数据的和排序</button> 
<table width=100%> 
<tr> 
<td valign="top"><table border id="tbl" width="80%"></table></td> 
<td valign="top"><table border id="tbl2" width="80%"></table></td> 
</tr> 
</table> 
<button onClick="javascript:mytable2.rnd()">随机选择行</button> 
<button onClick="javascript:mytable2.add()">添加一行</button> 
<button onClick="javascript:mytable2.del()">删除选定行</button> 
<button onClick="javascript:mytable2.up()">上移选定行</button> 
<button onClick="javascript:mytable2.down()">下移选定行</button> 
<button onClick="javascript:mytable2.sort(2)">按第二列数字排序</button> 
<button onClick="javascript:mytable2.sort(f)">按每行数据的和排序</button> 
</body> 
</html>

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I hope this article will be helpful to everyone in JavaScript programming.