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Method instances of using jquery selectors to obtain parent elements, child elements, and sibling elements

伊谢尔伦Original: 2018-05-15 11:11:562832browse

1. Get parent elements

1. parent([expr]): Get all parent elements of the specified element

<p id="par_p"><a id="href_fir" href="#">href_fir</a> 
<a id="href_sec" href="#">href_sec</a> 
<a id="href_thr" href="#">href_thr</a></p> 
<span id="par_span"> 
<a id="href_fiv" href="#">href_fiv</a> 
</span> 
$(
document
).ready(function(){ 
$("a").parent().addClass(&#39;a_par&#39;); 
});

firebugView the effect of jquery parent

2. Get the sibling element:
1. next([expr]):
Get the next sibling element of the specified element (note that it is the next sibling Element)

<!DOCTYPE html> 
<html> 
<head> 
<script type="text/
javascript
" src="/jquery/jquery.js"></script> 
</head> 
<body> 
<ul> 
<li>list item 1</li> 
<li>list item 2</li> 
<li class="third-item">list item 3</li> 
<li>list item 4</li> 
<li>list item 5</li> 
</ul> 
<script> 
$(&#39;li.third-item&#39;).next().css(&#39;
background-color
&#39;, &#39;red&#39;); 
</script> 
</body> 
</html>

The result of this example is that only the background color of list item 4 changes to red
2, nextAll([expr]):
Get all sibling elements behind the specified element

<p><span>And Again</span></p> 
var p_nex = $("p").nextAll(); 
p_nex.addClass(&#39;p_next_all&#39;);

Pay attention to the last "e388a4556c0f65e1904146cc1a846bee" tag, which is also added with the class name of 'p_next_all'~~
3. andSelf():
Get the content behind the specified element All sibling elements, followed by the specified element

<p>Hello</p><p>Hello Again</p><p><span>And Again</span></p> 
var p_nex = $("p").nextAll().andSelf(); 
p_nex.addClass(&#39;p_next_all&#39;);

Pay attention to the first "e388a4556c0f65e1904146cc1a846bee" tag. This sentence means to select all sibling tags after the p tag. , and myself. . .
The following two will not give specific examples. They are actually the opposite of next() and nextAll()
4. prev(): Get the previous sibling element of the specified element (the previous one) ).
5. prevAll(): Get all sibling elements in front of the specified element.
3. Obtain child elements
1. Search child elements method 1: >
For example: var aNods = $("ul > a"); Find all a tags under ul
2 , Find child elements method 2: children()
3. Find child elements method 3: find()
Here is a brief introduction to the following similarities and differences between children() and find():
1> children andfind methodBoth are used to obtain the subelements of element. Neither of them will return text node, just like most jQuery methods.
2> The children method only obtains the child elements below the element, namely: immediate children.
3> The find method obtains all subordinate elements, that is: descendants of these elements in the DOM tree
4> The parameter selector of the children method is optional (optionally), used to filter child elements,
But The parameter selector method of the find method is required.
5> The find method can actually be implemented by using jQuery(selector, context). That is, $('li.item-ii').find('li') is equivalent to $('li', 'li.item-ii').
Example:

<ul class="level-1"> 
<li class="item-i">I</li> 
<li class="item-ii">II 
<ul class="level-2"> 
<li class="item-a">A</li> 
<li class="item-b">B 
<ul class="level-3"> 
<li class="item-1">1</li> 
<li class="item-2">2</li> 
<li class="item-3">3</li> 
</ul> 
</li> 
<li class="item-c">C</li> 
</ul> 
</li> 
<li class="item-iii">III</li> 
</ul>

Use: $ ('ul.level-2').children().css('border', '1px solid green');
Use $('ul.level-2').find('li').css ('border', '1px solid green').

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