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jQuery attr() Overview

jQuery removeAttr() method

jQuery attr() and removeAttr() examples

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Let's talk about how to dynamically remove attributes in jQuery

PHPz

Apr 06, 2023 am 09:10 AM

jQuery is a widely used JavaScript library that optimizes, simplifies and unifies the way DOM manipulation is performed. jQuery provides a large number of encapsulated functions to facilitate the use of common DOM operations, such as adding, deleting, modifying the attributes and content of DOM elements, etc. Among them, the attr() function is a method used to get or set the attribute value of a DOM element. But sometimes we need to remove an attribute, in which case we need to use the removeAttr() method of attr(). This article will introduce you to the method of dynamically removing attributes in jQuery.

jQuery attr() Overview

Before introducing the dynamic removal of attributes, let’s first review jQuery’s attr() function. The attr() function has the function of getting or setting the attribute value of a DOM element. The usage is as follows:

// 获取属性值
$(selector).attr(attribute)
// 设置属性值
$(selector).attr(attribute,value)

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selector is a selector used to specify an HTML element or a collection of elements;
attribute is an attribute name string;
value is an attribute value string or function.

If you need to set multiple attributes at the same time, you can use objects as parameters, the syntax is as follows:

1	`$(selector).attr({attribute1:value1, attribute2:value2, ...})`

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jQuery removeAttr() method

removeAttr() function is a function that dynamically removes attributes in jQuery. Its syntax is:

1	`$(selector).removeAttr(attribute)`

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Among them, selector and attribute have the same meaning as in the attr() function The same. The removeAttr() function can dynamically remove HTML attributes and return them to their default state.

For example, we can remove the "disabled" attribute of the element through the following code:

1	`$("input[type='button']").removeAttr("disabled");`

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Note that the removeAttr() function can only remove those items that exist in HTML Attributes in the element. If the element has attributes set and modified via CSS, this method cannot remove those modified attribute values.

jQuery attr() and removeAttr() examples

In the following examples, we use the attr() and removeAttr() methods to dynamically modify the attributes of HTML elements. We first create a piece of HTML code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>jQuery attr() 和 removeAttr() 实例</title>
  <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
  <script>
    $(document).ready(function(){
      $("button").click(function(){
        $("p").attr("style","background-color:yellow; font-size:24px;");
      });
      $("input[type='button']").click(function(){
        $("p").removeAttr("style");
      });
    });
  </script>
  <style>
    p {
      background-color: lightblue;
      font-size: 20px;
    }
  </style>
</head>
<body>
 
<h2>jQuery attr() 和 removeAttr() 实例</h2>
 
<p>点击第一个按钮将更改样式。</p>
 
<button>更改样式</button>
<input type="button" value="移除样式">
 
</body>
</html>

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We reference the latest version of the jQuery library in this text code and create an HTML page that contains a button and an input box. When the user clicks the Change Style button, the

element background color will change to yellow, and the font size will change to 24px. When the user clicks the Remove Style button, the

element will revert to its default state. The event handlers for these two buttons use jQuery's attr() and removeAttr() methods. Of course, we can also test these two methods in the console.

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