检查（如果）并在jQuery中选择孩子/父母

Question

My html:

<div class="red-box">
<h2>
<a href="#">My Cars</a>
</h2>

<div class="block_left layout2">
    <div class="part1">
        <div class="gallery_block">
            <div class="block_topic">1</div>
            <div class="block_topic">2</div>
            <div class="block_topic">3</div>
        </div>
    </div>
</div>

<div class="red-box">
<h2>
<a href="#">My Bikes</a>
</h2>

<div class="block_left layout2">
    <div class="part1">
        <div class="gallery_block">
            <div class="block_topic">1</div>
            <div class="block_topic">2</div>
            <div class="block_topic">3</div>
        </div>
    </div>
</div>

</div>....

There are a lot of "red-box" divs with different titles in <h2><a href="">TITLE</a></h2> like in example above. And I need to select and change only one - "red-box" -> "block_left" -> "part1" -> "gallery_block" -> "block_topic" which contains "3" and do it only in single "red-box" which got <h2><a href="">My Cars</a></h2>

So, I am doing following:

    if ($(".red-box").children("h2").children("a").children("span:contains('My Cars')").length > 0) 
    {
// it finds the "red-box" which i need but how to select
// <div class="block_topic">3</div> in the "red-box" whose href has "My Cars"?
}

Thanks

Answer 1

$('.red-box').has('h2:contains(My Cars)').find('div.block_topic').eq(2);

http://jsfiddle.net/L5YBf/1/

Answer 2

using .has() , :contains ..

try this

$('.red-box').has('h2:contains("My Cars")').find('div.block_topic:contains("3")');

$('.red-box').has('h2:contains("My Cars")') => gets .red-box containing "My cars".

.find('div.block_topic:contains("3")') =>finds div.block_topic containing 3

Answer 3

If I understand correctly, you don't need an if() expression, just an appropriately phrased jQuery selection expression.

Also, particularly if the expression is to be generalized, you should avoid :contains , which is indiscriminate, in that it will find elements with embedded substrings matching the string of interest.

To select elements with exactly matching text, you can use .filter() , as follows :

$(".red-box h2 a").filter(function() {
    return $(this).text() === 'My Cars';
}).closest(".red-box").find(".block_topic").filter(function() {
    return $(this).text() === '3';
});

or, if you want a .block_topic of known index :

$(".red-box h2 a").filter(function() {
    return $(this).text() === 'My Cars';
}).closest(".red-box").find(".block_topic").eq(2);