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

WBOY
WBOYOriginal
2016-05-16 15:24:151434browse

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>

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

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