finding span inside this

im trying to change the display attribute of a span inside of a li using the find function of jquery....its not working and i think i know why....because the span isnt inside of the input element right? but im not sure how to fix it

heres my code:

$('form ul li input').click(function() {
    if ($(this).is(':checked'))
        $(this).find('span').attr('display', 'block');
    else
        $(this).find('span').attr('display', 'none');
});

i know all i need to do is make it so it searches the LI and not the INPUT....but im not sure how to do this.

heres the HTML for an li:

<li>

    <input type="checkbox" name="attack_strategies[]" id="strategy_4" value="4" /> 
    <label for="strategy_4">meditation</label>

    <span>

        <select name="attack_strategies_e[]" id="strategy_e_4">
        <option value="">How effective was it?</option>
        <option value="0">0</option>
        <option value="1">1</option><option value="2">2</opt开发者_C百科ion>
        <option value="3">3</option><option value="4">4</option>
        <option value="5">5</option><option value="6">6</option>
        <option value="7">7</option><option value="8">8</option>
        <option value="9">9</option><option value="10">10</option>          
        </select>

    </span>

</li>

You are right. Actually, an input element ^{[HTML4 spec]} cannot have any children:

<!ELEMENT INPUT - O EMPTY              -- form control -->

You can use closest ^[docs] to find the ancestor li and then search the span from there:

$(this).closest('li').find('span').css('display', 'block');

There might be other ways to to find the span but that depends on your HTML structure, which we don't know.

In the code you posted, this refer to the input field, and .find() documentation reads:

Description: Get the descendants of each element in the current set of matched elements, filtered by a selector, jQuery object, or element.

So you can't use find in an input field because it can haven't span child.

You can use what Felix Kling suggests.