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How to add and remove elements with jquery
- 青灯夜游Original
- 2022-05-24 16:07:332467browse
Methods to add elements: 1. Use append() or prepend() to add sub-elements inside the specified element; 2. Use after() or before() to add sibling elements. Removal method: 1. Use remove() to delete the selected elements and sub-elements; 2. Use empty() to delete the sub-elements but keep the selected elements.
The operating environment of this tutorial: windows7 system, jquery3.2.1 version, Dell G3 computer.
Four ways to add elements with jQuery:
1. append() adds content at the end of the selected element.
Use the append() method to add child elements to the "end" inside the div element.
Syntax:
$(A).append(B)
means inserting B at the end of A.
Example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(function () {
$("#btn").click(function () {
var newp = "<p>一个新段落</p>";
$("div").append(newp);
})
})
</script>
</head>
<body>
<div style="background-color: #FF0000;">
<p>第一段文本</p>
<p>第二段文本</p>
<p>第三段文本</p>
</div>
<input id="btn" type="button" value="插入" />
</body>
</html>
2. prepend() adds content at the beginning of the selected element.
The prepend() method can add child elements to the "beginning" inside the div element.
Syntax:
$(A).prepend(B)
means inserting B at the beginning of A.
Example:
$(function () {
$("#btn").click(function () {
var newp = "<p>一个新段落</p>";
$("div").prepend(newp);
})
})
3. after() selects an element and inserts content after the element.
$(A).after(B) means inserting B after the outside of A.
Example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(document).ready(function() {
$("button").click(function() {
$("div").after("这是往div后面增加的新文本内容");
});
});
</script>
</head>
<body>
<div style="height:100px;background-color:yellow">
这是一些文本。
<p>这是div块中的一个p段落。</p>
</div><br>
<button>往div后面增加内容</button>
</body>
</html>
4. before() selects an element and inserts content into the element.
$(A).before(B) means inserting B before the outside of A.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(document).ready(function() {
$("button").click(function() {
$("div").before("这是往div前面增加的新文本内容");
});
});
</script>
</head>
<body>
<div style="height:100px;background-color:yellow">
这是一些文本。
<p>这是div块中的一个p段落。</p>
</div><br>
<button>往div前面增加内容</button>
</body>
</html>
jQuery way to delete elements 2 methods:
Use The remove() method can delete the selected element and sub-elements at the same time.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(function () {
$("#btn").click(function () {
$("li:nth-child(4)").remove();
})
})
</script>
</head>
<body>
<ul>
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
<li>jQuery</li>
<li>Vue.js</li>
</ul>
<input id="btn" type="button" value="删除" />
</body>
</html>
Using empty() will delete the child elements of the selected element, but will not delete the selected element.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(function () {
$("#btn").click(function () {
$("ul li:nth-child(4)").empty();
});
})
</script>
</head>
<body>
<ul>
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
<li>jQuery</li>
<li>Vue.js</li>
</ul>
<input id="btn" type="button" value="删除" />
</body>
</html>
[Recommended learning: jQuery video tutorial, web front-end video】
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