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How to modify the attribute value of child elements in jquery
- 青灯夜游Original
- 2023-01-17 16:13:262154browse
Modification method: 1. Use the selector to obtain the specified element object. The syntax "$(selector)" will return a jquery object containing the specified element; 2. Use children() to obtain the children under the specified element object. Element, the syntax is "element object.children(filter)"; 3. Use attr() to modify the attribute value of the child element, the syntax is "child element.attr("attribute name","new value")" or "child element.attr" ({Attribute 1: "New Value", Attribute 2: "New Value"...})".
The operating environment of this tutorial: windows7 system, jquery3.6 version, Dell G3 computer.
In jquery, you can use the children() and attr() functions to modify the attribute values of child elements.
Implementation steps:
Step 1: Use jquery selector to obtain the specified element object
$(selector)
Will return a jquery object containing the specified element
Step 2: Use the children() function to obtain the direct child elements under the specified element object
元素对象.children(filter)
| Parameters | Description |
|---|---|
| filter | Optional. Specifies a selector expression that narrows the search for child elements. |
Will return the child elements under the specified element object
Step 3: Use attr () function modifies the attribute value of the child element
//单个属性
子元素对象.attr("属性名","新属性值");
//多个个属性
子元素对象.attr({属性1:"新值",属性2:"新值"....}); Implementation example:
Modifies the child element of ul## The class attribute value of #li
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.6.0.min.js"></script>
<style>
div * {
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
li{
color:red;
border:2px solid red;
}
.li{
color:green;
border:2px solid green;
}
</style>
<script>
$(document).ready(function() {
$("button").on("click", function() {
$("ul").children("li").attr("class","li");
});
});
</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>修改ul的子元素li的class属性值</button>
</body>
</html>
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