jQuery无法使用next / closest选择元素

Question

I have the following HTML on my page;

<div id="c2">
    <input type="checkbox" class="expandCollapseSection" id="my_chk">
    <span>Header</span>
    <div style="" class="contentDiv">
        <div class="oj-inputtext oj-form-control oj-component">some things</div>
    </div>
</div>

I have the following JS code;

$(".expandCollapseSection").click(function (event) {
    if ($(this).prop("checked")) {
        $(this).next('.contentDiv').slideDown('slow');
    } else {
        $(this).next('.contentDiv').slideUp('slow');
    }
}); 

Now my question is $(this).next('.contentDiv') does not select the contentDiv

I even tried using $(this).closest('.contentDiv')

But still does not select.

Just to add $(".contentDiv") does get the div though.

Am I doing something wrong here?

Answer 1

use siblings( ".selected" )

$(".expandCollapseSection").click(function (event) {
    if ($(this).prop("checked")) {
        $(this).siblings('.contentDiv').slideDown('slow');
    } else {
        $(this).siblings('.contentDiv').slideUp('slow');
    }
});  

Demo

Answer 2

You can try:

$(this).closest('div').find('.contentDiv');

 $(".expandCollapseSection").click(function (event) { if ($(this).prop("checked")) { $(this).closest('div').find('.contentDiv').css({'color':'red'}); } else { $(this).closest('div').find('.contentDiv').css({'color':'green'}); } }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <div id="c2"> <input type="checkbox" class="expandCollapseSection" id="my_chk"> <span>Header</span> <div style="" class="contentDiv"> <div class="oj-inputtext oj-form-control oj-component">some things</div> </div> </div> <div id="c3"> <input type="checkbox" class="expandCollapseSection" id="my_chk"> <span>Header</span> <div style="" class="contentDiv"> <div class="oj-inputtext oj-form-control oj-component">some things</div> </div> </div> 

Answer 3

kapantzak's answer is correct.

However you could simply use

$(this).parent().find('.contentDiv');

Slightly more efficient, as you don't have to find closest div.

Answer 4

Try This Code,

$(".expandCollapseSection").click(function (event) {
    if ($(this).prop("checked")) {
        $(this).closest('#c2').find('.contentDiv').slideDown('slow');
    } else {
        $(this).closest('#c2').find('.contentDiv').slideUp('slow');
    }
}); 

Answer 5

You may also use nextAll and shorten your code too, like below.

$(".expandCollapseSection").change(function (event) {
    var div = $(this).nextAll('.contentDiv');
    var func = this.checked ? 'slideDown' : 'slideUp';
    div[func]("slow");
});

Demo@ Fiddle