jQuery traversal add() method

jQuery is a collection object. After finding the specified collection of elements through the $() method, a series of operations can be performed. After $(), it means that the collection object is already determined. What to do if you need to add a new element to this collection later? jQuery provides the add method for this, which is used to create a new jQuery object , the element is added to the set of matched elements. The argument to add() can accept almost any $(), including a jQuery selector expression, DOM element, or HTML fragment reference.

Let’s look at a simple case:

Operation: select all li elements, and then add the p element to the li collection

<ul>

<li>list item 3</li>
</ul>
<p>New p element</ p>

Process 1: Pass the selector

$('li').add('p')

Process 2: Pass the dom Element

$('li').add(document.getElementsByTagName('p')[0])

Another way is to dynamically create a P tag and add it to the collection , and then insert it into the specified position, but this changes the arrangement of the elements themselves

$('li').add('<p>New p element</p>'). appendTo(target location)

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <title></title>
    <style>
    .left {
        width: auto;
        height: 150px;
    }
    
    .left div {
        width: 150px;
        height: 120px;
        padding: 5px;
        margin: 5px;
        float: left;
        background: #bbffaa;
        border: 1px solid #ccc;
    }
    </style>
    <script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
</head>

<body>
    <h2>add方法()</h2>
    <div class="left first-div">
        <div class="div">
            <ul>
                <li>list item 1</li>
                <li>list item 2</li>
                <li>list item 3</li>
            </ul>
            <p>新的p元素</p>
        </div>
    </div>
    <div class="right"></div>
    <br/>
    <button>点击：add传递元素标签</button>
    <button>点击：add传递html结构</button>
    <script type="text/javascript">
    $("button:first").click(function() {
         //把p元素添加到li的合集中
         $('li').add('p').css('background', 'red')
    })
    </script>
    <script type="text/javascript">
    $("button:last").click(function() {
         //把html结构'<p>新的p元素</p>'
         //加入到li的合集中，为了能够在页面上显示
         //需要再重新appendTo到指定的节点处
         //值得注意：整个结构位置都改变了
         $('li').add('<p>新的p元素</p>').appendTo($('.right'))
    })
    </script>
</body>

</html>

Continuing Learning

new file

<!DOCTYPE html> <html> <head> <meta http-equiv="Content-type" content="text/html; charset=utf-8" /> <title></title> <style> .left { width: auto; height: 150px; } .left div { width: 150px; height: 120px; padding: 5px; margin: 5px; float: left; background: #bbffaa; border: 1px solid #ccc; } </style> <script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script> </head> <body> <h2>add方法()</h2> <div class="left first-div"> <div class="div"> <ul> <li>list item 1</li> <li>list item 2</li> <li>list item 3</li> </ul> <p>新的p元素</p> </div> </div> <div class="right"></div> <br/> <button>点击：add传递元素标签</button> <button>点击：add传递html结构</button> <script type="text/javascript"> $("button:first").click(function() { //把p元素添加到li的合集中 $('li').add('p').css('background', 'red') }) </script> <script type="text/javascript"> $("button:last").click(function() { //把html结构'<p>新的p元素</p>' //加入到li的合集中，为了能够在页面上显示 //需要再重新appendTo到指定的节点处 //值得注意：整个结构位置都改变了 $('li').add('<p>新的p元素</p>').appendTo($('.right')) }) </script> </body> </html>

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jQuery traversal add() method

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