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How to query all child elements with jquery
- 青灯夜游Original
- 2022-04-15 12:11:249815browse
In jquery, you can use the find() method to query all child elements. This method can obtain all subset elements under the specified element, including subsets of subsets; this method requires passing in a parameter. To filter the results, you only need to set the parameter to "*" to find all sub-elements, the syntax is "$(specified element).find("*")".
The operating environment of this tutorial: windows7 system, jquery3.6.1 version, Dell G3 computer.
In jquery, there are two ways to find child elements:
children() method: Get the direct subset elements under the element
find() method: Get all subset elements (including subsets of subsets) under the element
Among them, you want to query all sub-elements , you can only use the find() method.
The find() method returns the descendant elements of the selected element. (Descendants are children, grandchildren, great-grandchildren, and so on.)
DOM tree: This method traverses all paths down the DOM element's descendants to the last descendant (< ;html>).
Syntax:
$(selector).find(filter)
| Parameters | Description |
|---|---|
| filter | Required. A selector expression, element, or jQuery object that filters search descendants. Note: To return multiple descendants, use commas to separate each expression. |
Description: The filter parameter is used to filter the search results. You only need to set the parameter to "*" to find all sub-elements.
Example: Query all child elements
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.6.1.min.js"></script>
<style>
div * {
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script>
$(document).ready(function() {
$("button").on("click", function() {
$("ul").find("*").css({
"color": "red",
"border": "2px solid red"
});
});
});
</script>
</head>
<body class="ancestors">
<div style="width:500px;">div (父节点)
<ul>ul (指定元素)
<li>li (子节点1)
<span>span (孙节点1)</span>
</li>
<li>li (子节点2)
<span>span (孙节点2)</span>
</li>
<li>li (子节点3)
<span>span (孙节点3)</span>
</li>
</ul>
</div>
<button>选取ul的所有子元素</button>
</body>
</html>
[Recommended learning: jQuery video tutorial, web front-end video】
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