Home > Developer > CSS

JavaScript/jquery dynamically changes the CSS style of an element

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

During development, we often encounter the need to dynamically modify the CSS style effect of an element, or dynamically change the style name of its div, next, I will introduce the implementation methods of js and jquery.

The js operation is simple. You can directly operate document. getElementById (id ).

Example

The Code is as follows: Copy code

<! DOCTYPE html>
<Html>
<Head>
<Title> TITLE </title>
<Style type = "text/css">
# MyDiv {
Background-color: blue;
Width: 100px;
Height: 200px;
}
</Style>
<Script type = "text/javascript">
Window. onload = function (){
Alert (document. getElementById ("myDiv"). style. width );
Document. getElementById ("myDiv"). style. width = "100px ";
}
</Script>
</Head>
<Body>
<Div id = "myDiv" style = "background-color: red; border: 1px solid black">
MyDiv
</Div>
</Body>
</Html>

Jquery Operation Method

The Code is as follows: Copy code
<P class = "myclass" title = "select your favorite fruit"> what is your favorite fruit? <P>

In the code above, the class is also the attribute of the p element. Therefore, you can use the attr () method to obtain the class and set the class.
The Code is as follows:

The Code is as follows: Copy code
Var p_class = $ ("p"). attr ("class"); // obtain the class of the p element

You can also use the attr () method to set the class.

The Code is as follows: Copy code
$ ("P"). attr ("class", "high"); // set the class of the p element to high

In most cases, it replaces the original class with the new class, instead of appending the new class on the basis of the original

The new Code is

The Code is as follows: Copy code
<P class = "high" title = "select your favorite fruit"> what is your favorite fruit? <P>

Append Style

The Code is as follows: Copy code

<Style>

. Another {

Font-style: italic;/* italic */

Color: blue;}/* set the font to blue */

</Style>

Append a style to the webpage

The Code is as follows: Copy code

$ ("Input: eq (2)"). click (function (){

$ ("P"). addclass ("another ");

})

The removeClass () method is used to remove a style.

The Code is as follows: Copy code

$ ("P"). removeclass ("high ");

<P class = "high another"> test <p>,

Remove both p classes

The Code is as follows: Copy code
$ ("P"). removeclass ("high"). removeclass ("another ");
Or
$ ("P"). removeclass ("high another ");
Or remove all classes.
$ ("P"). removeclass ();

Change style
Jquery provides the toggleclass () method to control style switching.

The Code is as follows: Copy code
$ ("P"). toggleclass ("another ");

Determines whether a style is included. If yes, true is returned. Otherwise, false is returned.

The Code is as follows: Copy code

$ ("P"). hasClass ("another"); equivalent to $ ("p"). is (". another ");

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More