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/