jQuery 最接近的类选择器

jQuery closest class selector

提问by olo

<div class="wrap">
    <div class="Level2">Click me</div>
    <div class="Level3">Information</div>
</div>

<div class="wrap">
    <div class="Level2">Click me</div>
    <div class="Level3">Information</div>
</div>

<div class="wrap">
    <div class="Level2">Click me</div>
    <div class="Level3">Information</div>
</div>

<div class="wrap">
    <div class="Level2">Click me</div>
    <div class="Level3">Information</div>
</div>

jQuery

jQuery

$('.Level2').click(function(){
   $('.Level2').closest('.Level3').fadeToggle();
});

I wanted to select the closest level3 to fadeIn and fadeOut, but doesn't work. Is my syntax wrong? online Sample :http://jsfiddle.net/meEUZ/

我想选择最接近淡入和淡出的 level3，但不起作用。我的语法错了吗？在线示例：http: //jsfiddle.net/meEUZ/

回答by Rishabh

Try .next()instead of .closest()that traverses through the ancestors of the DOM element.

尝试.next()而不是.closest()遍历 DOM 元素的祖先。

Working Demo

工作演示

Also you should use $(this)rather than $('.Level2')else it'll select ALL the .Level2rather than the clicked one.

此外，您应该使用$(this)而不是$('.Level2')else 它将选择所有.Level2而不是点击的。

You can also go for something like this - $(this).closest('.wrap').find('.Level3').fadeToggle();.

你也可以这样做 - $(this).closest('.wrap').find('.Level3').fadeToggle();。

Cheers!

干杯!

回答by ryanbrill

jQuery's .closest()method doesn't select sibling selectors, but parents. Looks like you're looking for the .siblings()method.

jQuery 的.closest()方法不选择兄弟选择器，而是选择父选择器。看起来您正在寻找.siblings()方法。

$('.Level2').click(function(){
   $(this).siblings('.Level3').fadeToggle();
});

回答by Rooster

closest travels up the dom tree. it won't find something thats a sibling. you can use a find on a parent to achieve this

最近沿 dom 树向上移动。它不会找到兄弟姐妹的东西。您可以使用对父项的查找来实现此目的

$('.Level2').click(function(){
       $(this).parent().find('.Level3').fadeToggle();
    });

回答by Mr Singh

Yes, There are many method avaiable in Jquery to find closest of the DOMelement

是的，在 Jquery 中有很多方法可以找到最接近的DOM元素

$('.Level1').click(function(){
   $(this).next('.Level3').fadeToggle();
});
$('.Level2').click(function(){
   $(this).closest('.wrap').find('.Level3').fadeToggle();

});
$('.Level4').click(function(){
    $(this).parent().find('.Level3').fadeToggle(); 
});

$('.Level5').click(function(){
    $(this).siblings('.Level3').fadeToggle();
});

.level{background:Red;width:200px;height:40px;}
.Level3{background:blue;width:300px;height:50px;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrap">
    <div class="Level1 level">Click me()sing next)</div>
    <div class="Level3">Information</div>
</div>

<div class="wrap">
    <div class="Level2 level">Click me(Using closest)</div>
    <div class="Level3">Information</div>
</div>

<div class="wrap">
    <div class="Level4 level">Click me(Usingh Parent)</div>
    <div class="Level3">Information</div>
</div>

<div class="wrap">
    <div class="Level5 level">Click me(Using Sibiling)</div>
    <div class="Level3">Information</div>
</div>

回答by AL MaMun

Get a clear idea from the following code:

从下面的代码中得到一个清晰的想法：

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
    $(document).ready(function () {
        $(".add").on("click", function () {
            var v = $(this).closest(".division").find("input[name='roll']").val();
            alert(v);
        });
    });
</script>
<?php

for ($i = 1; $i <= 5; $i++) {
    echo'<div class = "division">'
        . '<form method="POST" action="">'
        . '<p><input type="number" name="roll" placeholder="Enter Roll"></p>'
        . '<p><input type="button" class="add" name = "submit" value = "Click"></p>'
        . '</form></div>';
}
?>

回答by Rutwick Gangurde

Yes! closeststarts the DOM search from the selector you pass to it, and goes upwards the DOM hierarchy, searching through the parents/ancestors. Use siblingsor nextinstead. Like this:

是的！closest从您传递给它的选择器开始 DOM 搜索，并向上 DOM 层次结构，搜索父/祖先。使用siblings或next代替。像这样：

$('.Level2').click(function(){
    $(this).siblings('.Level3').fadeToggle();
});