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How to query the previous element with jquery
- 青灯夜游Original
- 2022-03-16 15:51:175993browse
In jquery, you can use the prev() method to query the previous element of a specified element. This method can return the previous sibling element of the selected element. The syntax is "$(selector).prev(filter) "; "filter" is an optional parameter. If set, it can narrow the scope of searching for the previous sibling element.
The operating environment of this tutorial: windows7 system, jquery3.2.1 version, Dell G3 computer.
In jquery, you can use the prev() method to query the previous element of a specified element.
prev() method returns the previous sibling element of the selected element.
Sibling elements are elements that share the same parent element.
Note: This method only returns one element.
Syntax:
$(selector).prev(filter)
Parameter filter: Optional, specifies a selector expression that narrows the scope of the search for the previous sibling element.
Example 1: Return the previous sibling element of each
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<style>
.siblings * {
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(document).ready(function() {
$("li.start").prev().css({
"color": "red",
"border": "2px solid red"
});
});
</script>
</head>
<body>
<div style="width:500px;" class="siblings">
<ul>ul (父节点)
<li>li (兄弟节点)</li>
<li>li (类名为"start"的li节点的上一个兄弟节点)</li>
<li class="start">li (类名为"start"的li节点)</li>
<li>li (兄弟节点)</li>
<li>li (兄弟节点)</li>
</ul>
</div>
</body>
</html>
Example 2: Select the previous sibling element of each <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(document).ready(function() {
$("div").prev().css("background-color", "yellow");
});
</script>
</head>
<body>
<p>这是一个P元素。</p>
<h2>这是一个标题，并且是div元素的上一个兄弟元素</h2>
<div style="border:1px solid black;padding:10px;">这是一个div元素。</div>
<p>这是另一个P元素。</p>
<p>这是一个P元素，并且是div元素的上一个兄弟元素。</p>
<div style="border:1px solid black;padding:10px;">
<p>这是div里面的一个P元素。</p>
</div>
</body>
</html>
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