


Summary of common operations methods for JavaScript tables_javascript skills
The examples in this article summarize common operation methods of JavaScript tables. Share it with everyone for your reference. The details are as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>无标题页</title> <script type="text/javascript"> var mytable=null; window.onload=function(){ mytable=new CTable("tbl",10); //随机创建10行表格 } Array.prototype.each=function(f){ //数组的遍历 for(var i=0;i<this.length;i++) f(this[i],i,this)} function $A(arrayLike){ //数值的填充 for(var i=0,ret=[];i<arrayLike.length;i++) ret.push(arrayLike[i]); return ret } Function.prototype.bind = function() { //数据的绑定 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"?document.getElementById(id):id; if (rows && /^d+$/.test(rows)) this.addrows(rows) //为表格添加行数 } CTable.prototype={ addrows:function(n){ //随机添加n行 new Array(n).each(this.add.bind(this)) }, add:function(){ //添加1行 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) //第一列添加复选框 td1.setAttribute("width","35") td2.innerHTML=Math.ceil(Math.random()*99) //第二列的随机填充值 td3.innerHTML=Math.ceil(Math.random()*99) //第三列的随机填充值 }, del:function(){ //删除所选行 var self=this $A(self.tbl.rows).each(function(tr){if (self.getChkBox(tr).checked) tr.parentNode.removeChild(tr)}) }, up:function(){ //上移所选行 var self=this var upOne=function(tr){ //上移1行 if (tr.rowIndex>0){ self.swapTr(tr,self.tbl.rows[tr.rowIndex-1]) self.getChkBox(tr).checked=true}} var arr=$A(self.tbl.rows).reverse() //反选 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(){ //下移所选行 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)?1:-1; //转化为数字类型比较大小 }else if (typeof(order)=="function"){ //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(){ //随即选择几行数据 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(){ //设置行的背景色 var self=this; var evt=arguments[0] || window.event var chkbox=evt.srcElement || evt.target var tr=chkbox.parentNode.parentNode chkbox.checked?self.setBgColor(tr):self.restoreBgColor(tr) }, swapTr:function(tr1,tr2){ //交换tr1和tr2的位置 var target=(tr1.rowIndex<tr2.rowIndex)?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){ //设置背景色 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)?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)">按第一列排序</button> <button onClick="javascript:mytable.sort(f)">按数据和排序</button> <br/><br/> <table width=100%> <tr> <td valign="top"><table border id="tbl" width="80%"></table></td> </tr> </table> </body> </html>
I hope this article will be helpful to everyone’s JavaScript programming design.

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