Using jQuery in Rails 3 to display the id of a td element

Question

Using jQuery in Rails 3 to display the id of a td element

I am working with a 3x3 table that contains td elements with unique id's (id='a1'...id='c3'). I want to enable the user to click on any of these 9 td elements and receive an alert displaying the id of the clicked td.

Below is my Coffeescript code (found in the asset pipeline):

$(document).ready ->
$("td").click ->
    alert(#I wish to display the id of the clicked td cell)

This is the content of my index.html.erb file:

<table>
 <tbody>
  <tr>
   <td id='a1'>A1</td>
   <td id='b1'>B1</td>
   <td id='c1'>C1</td>
  </tr>

  <tr>
   <td id='a2'>A2</td>
   <td id='b2'>B2</td>
   <td id='c2'>C2</td>
  </tr>

  <tr>
   <td id='a3'>A3</td>
   <td id='b3'>B3</td>
   <td id='c3'>C3</td>
  </tr>
 </tbody>
</table>

Any assistance with JavaScript will be greatly appreciated!

javascript html ruby-on-rails-3 jquery-ui coffeescript

Answer 1

Answer №1

$('td').click: (e)->
  alert $(@).id

Using CoffeeScript, you can achieve the same functionality as above.

Storing user data within HTML elements is made simple with data-* attributes, an example being:

<td data-id="42"></td>

Retrieving this id using jQuery's data method is straightforward:

var id = $('td').data('id');

Answer 2

$('td').click: (e)->
  alert $(@).id

Using CoffeeScript, you can achieve the same functionality as above.

Storing user data within HTML elements is made simple with data-* attributes, an example being:

<td data-id="42"></td>

Retrieving this id using jQuery's data method is straightforward:

var id = $('td').data('id');

Answer 3

Answer №2

Initially, utilizing jQuery on results in enhanced performance compared to attaching a click handler individually to each td, especially in scenarios where there are numerous tds:

$('table').on 'click', 'td', (event) ->
  # event.currentTarget represents the clicked td
  alert event.currentTarget.id

event.currentTarget is an object of the DOM element, therefore all attributes are accessible as object properties. The assertions made by other answers regarding $(this).id are inaccurate, as $(this) (or $(event.currentTarget)) is a jQuery object, and hence attributes can be accessed using the attr method: $(this).attr('id').

Answer 4

Initially, utilizing jQuery on results in enhanced performance compared to attaching a click handler individually to each td, especially in scenarios where there are numerous tds:

$('table').on 'click', 'td', (event) ->
  # event.currentTarget represents the clicked td
  alert event.currentTarget.id

event.currentTarget is an object of the DOM element, therefore all attributes are accessible as object properties. The assertions made by other answers regarding $(this).id are inaccurate, as $(this) (or $(event.currentTarget)) is a jQuery object, and hence attributes can be accessed using the attr method: $(this).attr('id').

Using jQuery in Rails 3 to display the id of a td element

Answer №1

Answer №2

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