Show and hide table column using jQuery

Question

I came across this fiddle from a SO answer, that hides a table column once a button is clicked. What i want is the absolute opposite. I want it to be hidden by default, and then show and hide (toggle) when i click a button.

How can i achieve this?

Here's the fiddle:

FIDDLE

HTML:

<table id="foo">
<tr><td>1</td><td>2</td><td>3</td><td>4</td></tr>
<tr><td>1</td><td>2</td><td>3</td><td>4</td></tr>
<tr><td>1</td><td>2</td><td>3</td><td>4</td></tr>
<tr><td>1</td><td>2</td><td>3</td><td>4</td></tr>
<tr><td>1</td><td>2</td><td>3</td><td>4</td></tr>
</table>
<button onclick='document.getElementById("foo").classList.toggle("hide2")'>Click me</button>

CSS:

#foo td {
padding: 1em;
border: 1px solid black;
}

#foo.hide2 tr > *:nth-child(2) {
    display: none;
}

Answer 1

Set the hide2 class initially to the element or execute the toggle statement once.

 #foo td { padding: 1em; border: 1px solid black; } #foo.hide2 tr > td:nth-child(2) { display: none; } 

 <table id="foo" class="hide2"> <!------------^^^^^^^^^^^--> <tr> <td>1</td> <td>2</td> <td>3</td> <td>4</td> </tr> <tr> <td>1</td> <td>2</td> <td>3</td> <td>4</td> </tr> <tr> <td>1</td> <td>2</td> <td>3</td> <td>4</td> </tr> <tr> <td>1</td> <td>2</td> <td>3</td> <td>4</td> </tr> <tr> <td>1</td> <td>2</td> <td>3</td> <td>4</td> </tr> </table> <button onclick='document.getElementById("foo").classList.toggle("hide2")'>Click me</button> 

Answer 2

I know how to do it with JQuery adding this line.

$('td:nth-child(2)').hide();

http://jsfiddle.net/bnDVS/609/

And with CSS add it:

#foo td:nth-child(2) { display: none;}

And change it:

#foo.hide2 tr > td:nth-child(2) {
    display: none;
}

To:

#foo.hide2 tr > td:nth-child(2) {
    display: table-cell;
}

http://jsfiddle.net/bnDVS/610/