html - How to add rows and columns dynamically in a listbox in javascript -

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i trying create 1500 rows each having 4 column/cells in list box. wanted dynamically. have added listbox using html html

<body onload="load()"> <div id="myform">  <select id ="listid" name="mytable" size="5" style="width: 100px;" > </select>  <input type="button" id="create" value="click here" onclick="javascript:addtable()"> <!-- create table , add srows , column javascript -->  </div> </body>

javascript note: able create row dont know how create column.

function addtable() {  var nofrow = 1500; (var = 0; < nofrow; i++) {      var opt = document.createelement("option");      document.getelementbyid("listid").options.add(opt);    // (var j = 0; j < noofcell; j++) {    //           not able figure out add    //} } 

function addrow(tableid) {   var table = document.getelementbyid(tableid);   var rowcount = table.rows.length;   var row = table.insertrow(rowcount);    var cell1 = row.insertcell(0);   var element1 = document.createelement("input");   element1.type = "checkbox";   element1.name="chkbox[]";   cell1.appendchild(element1);    var cell2 = row.insertcell(1);   cell2.innerhtml = rowcount + 1;    var cell3 = row.insertcell(2);   var element2 = document.createelement("input");   element2.type = "text";   element2.name = "txtbox[]";   cell3.appendchild(element2);  }

source dynamically add/remove rows in html table using javascript


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