How to use jQuery to find elements whose name attribute is not empty?

How to use jQuery to find elements whose name attribute is not empty?

When writing web pages, you often need to operate on web page elements, and sometimes you need to filter specific elements based on their attributes. When using jQuery, we can easily find elements that meet the conditions through selectors. This article will detail how to use jQuery to find elements with specific attributes, along with code examples.

First of all, we need to clarify our requirements: find elements whose name attribute is not empty. Next, we can use jQuery's attribute selectors to accomplish this task. Attribute selectors are represented by square brackets [], and elements can be found by specifying attributes and their corresponding values ​​within the square brackets.

The specific code examples are as follows:

<!-- HTML结构 -->
<div name="test1">元素1</div>
<div name="">元素2</div>
<div>元素3</div>
<div name="test2">元素4</div>

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
    // 使用属性选择器查找name属性不为空的元素
    var elementsWithName = $('[name]:not([name=""])');
    
    // 遍历找到的元素并输出其内容
    elementsWithName.each(function(){
        console.log($(this).text());
    });
});
</script>

In the above code, we first define an HTML structure containing four div elements, some of which have the name attribute. Then bring in the jQuery library and execute the code after the document is ready. In the code, we use the attribute selector [name]:not([name=""]) to find the element with the name attribute and the name attribute is not empty, and store it in elementsWithName variable.

Next, we use the each method to traverse these elements, and obtain the text content of each element through $(this).text(), and finally through console.logOutput to the console.

Through the above code example, we successfully used jQuery to find elements with a name attribute that is not empty, and can further operate these elements to achieve our needs. jQuery's selector function is powerful and flexible, which can help us quickly and accurately locate the elements that need to be operated and improve development efficiency.

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