Summary of common operation methods of JavaScript table

  • 2020-05-27 04:24:02
  • OfStack

This example summarizes common operations for JavaScript tables. Share with you 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> No title page </title>
<script type="text/javascript">
var mytable=null;
window.onload=function(){
mytable=new CTable("tbl",10); // Random create 10 Line form 
}
Array.prototype.each=function(f){ // Array traversal 
for(var i=0;i<this.length;i++) f(this[i],i,this)}
function $A(arrayLike){ // Numerical filling 
for(var i=0,ret=[];i<arrayLike.length;i++) ret.push(arrayLike[i]);
return ret
}
Function.prototype.bind = function() { // Data binding 
 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) // Add the number of rows to the table 
}
CTable.prototype={
addrows:function(n){ // Random added n line 
new Array(n).each(this.add.bind(this))
},
add:function(){ // add 1 line 
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) // The first 1 Columns add checkboxes 
td1.setAttribute("width","35")
td2.innerHTML=Math.ceil(Math.random()*99) // The first 2 The random filling of a column 
td3.innerHTML=Math.ceil(Math.random()*99) // The first 3 The random filling of a column 
},
del:function(){ // Deletes the selected row 
var self=this
$A(self.tbl.rows).each(function(tr){if (self.getChkBox(tr).checked) tr.parentNode.removeChild(tr)})
},
up:function(){ // Move the selected row up 
  var self=this
  var upOne=function(tr){ // Move up 1 line 
  if (tr.rowIndex>0){
  self.swapTr(tr,self.tbl.rows[tr.rowIndex-1])
  self.getChkBox(tr).checked=true}}
  var arr=$A(self.tbl.rows).reverse() // The selected 
  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(){ // Move the selected row down 
  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(){ // The sorting  
var self=this,order=arguments[0];
var sortBy=function(a,b){
if (typeof(order)=="number"){ // digital , Sort by the column indicated by the number 
return Number(a.cells[order].innerHTML)>=Number(b.cells[order].innerHTML)?1:-1; 
// Convert to numeric type to compare size 
}else if (typeof(order)=="function"){
// Return result sort 
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(){ // Select a few lines of data 
var self=this,selmax=0,tbl=self.tbl;
if (tbl.rows.length){
 selmax=Math.max(Math.ceil(tbl.rows.length/4),1);
// No more than the number of rows selected tr The number of 1/4
 $A(tbl.rows).each(function(x){
self.getChkBox(x).checked=false;
self.restoreBgColor(x)
})
}else{
return alert(" There is no data to choose from ")
}
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(){ // Sets the background color of the row 
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){ // exchange tr1 and tr2 The location of the 
var target=(tr1.rowIndex<tr2.rowIndex)?tr2.nextSibling:tr2;
var tBody=tr1.parentNode
tBody.replaceChild(tr2,tr1);
  tBody.insertBefore(tr1,target);
},
getChkBox:function(tr){ // from tr get  checkbox object 
return tr.cells[0].firstChild
},
restoreBgColor:function(tr){     
tr.style.backgroundColor="#ffffff"
},
setBgColor:function(tr){ // Set the background color 
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()"> Random selection of rows </button>
<button onClick="javascript:mytable.add()"> add 1 line </button>
<button onClick="javascript:mytable.del()"> Delete the selected row </button>
<button onClick="javascript:mytable.up()"> Move the selected row up </button>
<button onClick="javascript:mytable.down()"> Move down the selected row </button>
<button onClick="javascript:mytable.sort(1)"> According to the first 1 Column sorting </button>
<button onClick="javascript:mytable.sort(f)"> By data and sort </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 has been helpful to your javascript programming.


Related articles: