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How to get the parent element of an element using the parent() method? Detailed explanation of parent() method case

伊谢尔伦
伊谢尔伦Original
2017-06-17 10:38:313971browse

Definition and Usage

parent() Gets the parent element of each element in the current set of matching elements. Filtering with a selector is optional.

.parent(selector)

selector: String value containing the selector expression used to match the element.

Syntax structure:

$(":parent")

This selector is generally used in conjunction with other selectors, such as Class selector and element selectors and so on. For example:

$("div:parent").animate({width:"300px"})

The above code can set the width of a div containing text or elements to 300px.
If not used with other selectors, the default state is to be used with the * selector, for example, $(":parent") is equivalent to $("*:parent").

Details

Given a jQuery object representing a collection of DOM elements, the .parent() method allows us to search the DOM tree for the parent elements of these elements and construct a new one with the matching elements. jQuery object. The .parents() method is similar to the .parent() method, except that the latter traverses a single level up the DOM tree.

This method accepts an optional selector expression of the same type as the parameter we passed to the $() function. If this selector is applied, elements will be filtered by testing whether they match the selector.

Example

Find the parent element of each paragraph with the "selected" class: 

$("p").parent(".selected")

Consider this page with a basic nested list: 

<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>

If we start with item A, we can find its parent element: 

$(&#39;li.item-a&#39;).parent().css(&#39;background-color&#39;, &#39;red&#39;);

The result of this call is to set a red background for the level-2 list. Since we didn't apply a selector expression, the parent element naturally becomes part of the object. If a selector is applied, the element is checked to see if it matches the selector before it is included.

Example 1 code is as follows: 

<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.php.cn/" />
<title>php.cn</title>
<style type="text/css">
div{
list-style-type:none;
width:150px;
height:30px;
border:1px solid red;
}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("button").click(function(){
$("div:parent").animate({width:"300px"})
})
})
</script>
</head>
<body>
<div>我是文本</div>
<div></div>
<button>点击查看效果</button>
</body>
</html>

Example 2: 

<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.php.cn/" />
<title>php.cn</title>
<style type="text/css">
div{
list-style-type:none;
width:150px;
height:30px;
border:1px solid red;
}
span{border:1px solid green;}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("button").click(function(){
$("*:parent").animate({width:"300px"})
})
})
</script>
</head>
<body>
<div>我是文本</div>
<div></div>
<span>大家好</span>
<button>点击查看效果</button>
</body>
</html>

Since the above code does not specify a selector to be used with the :parent selector, it defaults to * Selector is used together, so the code can set the width of the element containing text and elements to 300px in a custom animation.

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