How to delete css attributes in js

How to use JavaScript to delete CSS attributes

In the process of using JavaScript for web development, it is often necessary to modify or delete CSS attributes. In this article, we will explain how to remove CSS properties using JavaScript.

1. Get the element

Before modifying the CSS properties, we need to get the element to be modified. We can get the element using the following method:

1. Get the element by ID:

var element = document.getElementById("elementId");

2. Get the element by tag name:

var element = document.getElementsByTagName("elementTagName")[0];

3. Get the element through the class name:

var elements = document.getElementsByClassName("elementClassName");

2. Delete the CSS attribute

After getting the element, we need to use JavaScript to delete the CSS attribute. There are two methods:

1. Use the removeProperty method

The removeProperty method can delete the value of the specified property.

element.style.removeProperty("propertyName");

Among them, propertyName is the name of the CSS property to be deleted.

For example, if we want to delete the color attribute of the element with the id "elementId", we can use the following code:

var element = document.getElementById("elementId");
element.style.removeProperty("color");

2. Use the direct assignment to "" method

We can also directly assign the CSS attribute value to the empty string "" to delete the attribute.

element.style.propertyName = "";

For example, if we want to delete the color attribute of the element with the id "elementId", we can use the following code:

var element = document.getElementById("elementId");
element.style.color = "";

3. Apply to specific scenarios

The following is a A specific scenario to demonstrate how to use JavaScript to remove CSS properties. We have a button. When the button is clicked, the color attribute of the h1 tag needs to be deleted.

HTML code:

<h1 id="title">Hello, World!</h1>
<button id="button">Click</button>

JavaScript code:

var button = document.getElementById("button");
var title = document.getElementById("title");

button.addEventListener("click", function() {
  title.style.color = "";
});

In the above code, we first obtain the button and h1 tag. Then, we added a click event listener to the button. When the button is clicked, the click event handler will set the color attribute of the h1 tag to an empty string, thus deleting the attribute.

Summary

The above is how to delete CSS properties using JavaScript. We can use the removeProperty method or directly assign the property value to an empty string to achieve deletion. In specific applications, we need to first obtain the element to be modified, and then add the corresponding event listener to trigger the deletion operation.

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