How to change element in another element

Question

I have a page which has several

<tr>

elements, which contains three things:

<td>
with number and dot behind it (like this:
<td>19.</td>
)

<td>
with description

<td>
with checkbox

<table>

  <!-- Some other <tr>s there... -->

  <tr id="somethingGeneratedWhichIDontKnow">

    <td id="aduju1j">13.</td>

    <td id="ajdi1">lorem ipsum dolor sit amet consectetur adipiscing elit</td>

    <td id="3j21">

      <input type="checkbox" id="3125ac_a">

    </td>

  </tr>

  <!-- Some other <tr>s there... -->

</table>

I need to find

<tr>

element which has 1st

<td>

with some number and change the checkbox there.

So my question is: How can I find the right checkbox? ID of elements is generated by web, so I can't select it by ID. I accept both javascript and jQuery answers.

I'm new to JS and jQuery so thanks you for all your help :-)

Answer 1

var checkbox = $('td:contains("13.")').eq(0).parent().find(":checkbox")

How to change element in another element

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