Creating dynamic tables using javascript, given rows and column in textboxes

Question

I am back with a problem again (please cooperate with my silly questions, i am very new to JavaScript). I am trying for understanding the concept of dynamic tables in JavaS

Answer 1

JS

function createTable() {
    var a, b, tableElem, rowElem, colElem;

    a = document.getElementById('tb1').value;
    b = document.getElementById('tb2').value;

    if (a == "" || b == "") {
        alert("Please enter some numeric value");
    } else {
        tableElem = document.createElement('table');

        for (var i = 0; i < a; i++) {
            rowElem = document.createElement('tr');

            for (var j = 0; j < b; j++) {
                colElem = document.createElement('td');
                colElem.appendChild(document.createTextNode(j + 1)); //to print cell number
                rowElem.appendChild(colElem);
            }

            tableElem.appendChild(rowElem);
        }

        document.body.appendChild(tableElem);


    }
}

JSFiddle
http://jsfiddle.net/mprRb/1/

Answer 2

here's another solution using innerHTML

<script type = "text/javascript">

function createTable(){

var a = document.getElementById("tb1").value;
var b = document.getElementById("tb2").value;
var resultTable = '<table>';

if(a=="" || b==""){
    alert("Please enter some numeric value");
    }else{
         for(var i=0;i<parseInt(a);i++){
              resultTable += '<tr>';
              for (var j=0;j<parseInt(b);j++)
                   resultTable +='<td><\/td>';
              }
              resultTable +='<\/tr>';

         }
    resultTable+='<\/table';
    }
    return resultTable;

}

</script>

after that, just add the result to whatever element you want using innerHTML, for example, if you have:

<div id='myElement'></div>

then you can add the table to the element (inside any js function) like this:

var targetElement = document.getElementById('myElement');
targetElement.innerHTML = createTable();

otherwise, you can just delete the line:

return resultTable;

and add the table to the element directly inside the function, like this:

var target = document.getElementById('myElement');
target.innerHTML=resultTable;

Answer 3

Here is your function:

function createTable(){
    var a = document.getElementById("tb1").value;
    var b = document.getElementById("tb2").value;

        if(a=="" || b==""){
            alert("Please enter some numeric value");
            }else{


            row=new Array();
        cell=new Array();

        row_num=parseInt(a); //edit this value to suit
        cell_num=parseInt(b); //edit this value to suit

        tab=document.createElement('table');
        tab.setAttribute('id','newtable');

        tbo=document.createElement('tbody');

        for(c=0;c<row_num;c++){
        row[c]=document.createElement('tr');

        for(k=0;k<cell_num;k++) {
        cell[k]=document.createElement('td');
        cont=document.createTextNode((c+1)*(k+1))
        cell[k].appendChild(cont);
        row[c].appendChild(cell[k]);
        }
        tbo.appendChild(row[c]);
        }
        tab.appendChild(tbo);
        document.getElementById('mytable').appendChild(tab);//'myTable' is the parent control of your table, change it as per your requirements
                }
            }

        }

Add this attribute to your button b1 onclick="createTable();"