Detailed explanation of jQuery's method of finding elements whose name attribute is not null

jQuery is a very popular JavaScript library that is widely used in web development. In web development, we often encounter the need to find specified elements, and sometimes we need to find elements with specific attributes, such as finding elements whose name attribute is not null. This article will introduce in detail how to use jQuery to find elements whose name attribute is not null, so that everyone can have a comprehensive understanding of this function.

First, let's look at a simple HTML example, assuming we have the following HTML structure:

<input type="text" name="username" />
<input type="text" name="email" />
<input type="text" />
<input type="text" name="phone" />

Now our goal is to use jQuery to find the property that has the name attribute and the name attribute is not null element. The following is a specific code example:

$(document).ready(function(){
    // 使用jQuery选择器来查找具有name属性并且name属性不为null的元素
    var elementsWithNameAttribute = $('input[name][name!=""]');
    
    // 遍历找到的元素并输出它们的name属性
    elementsWithNameAttribute.each(function(){
        console.log($(this).attr('name'));
    });
});

In the above code, we use jQuery's attribute selector to find elements that have a name attribute and the name attribute is not null. Specifically, $('input[name][name!=""]')This code will select all input elements that have a name attribute and the name attribute is not empty. We then use the each() method to iterate through the found elements and output their name attributes.

By running the above code, we will see the following console output:

username
email
phone

In this way, we have successfully found the element with the name attribute and the name attribute is not null, And output their name attribute.

To summarize, this article details how to use jQuery to find elements that have a name attribute and the name attribute is not null. We can easily implement this function through the combination of attribute selectors and each() method. I hope that through the explanation in this article, everyone will have a deeper understanding of this function and be able to use it flexibly in their own projects.

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