JavaScript onClick event - HTML table

Question

I\'m learning JavaScript and recently I have been experimenting with Mouse events, trying to understand how they work.

Answer 1

var table = document.getElementById("tableID");
if (table != null) {
    for (var i = 0; i < table.rows.length; i++) {
        for (var j = 0; j < table.rows[i].cells.length; j++)
        table.rows[i].cells[j].onclick = function () {
            tableText(this);
        };
    }
}

function tableText(tableCell) {
    alert(tableCell.innerHTML);
}

is an example of what you could do. DEMO

Answer 2

Just insert onclick into each <td> of the table and if the cell's name were example, you could do something similar to this:

<td onclick="alert('You are clicking on the cell EXAMPLE')">

Answer 3

Instead of using getElementById, we could use .querySelectorAll to retrieve all the table dimensions AKA cells. After which, we can execute a single loop (Although please note that in the back end of JS, there will still be a loop executed to retrieve table cells.). First, let's create the action to be carried out upon clicking a cell:

function tableText() {
    alert(this.innerHTML);
}

Let's retrieve all the cells with querySelectorAll method:

var cells = document.querySelectorAll("td")

Place the event listener to each and every cell:

for (var i = 0; i < cells.length; i++)
    cells[i].addEventListener("click", tableText)
}

Complete code:

function tableText() {
  alert(this.innerHTML);
}

var cells = document.querySelectorAll("td")

for (var i = 0; i < cells.length; i++){
  cells[i].addEventListener("click", tableText)
}