Before and After pseudo classes used with styled-components

问题

What is the proper way to apply :before and :after pseudo classes to styled components?

I know that you can use

&:hover {}

to apply the :hover pseudo class to a styled-component.

Does this work for All pseudo elements like before and after?

I have tried using the &:before and &:after strategy with some rather complex examples and i'm not sure if my attempts are not working because i've got something wrong with my example or it just doesn't work like that.

Does someone have some insight on this? Thank you.

回答1:

Pseudo-selectors in styled-components work just like they do in CSS. (or rather, Sass) Whatever isn't working is likely a problem in your specific code, but that's hard to debug without seeing the actual code!

Here is an example of how to use a simple :after:

const UnicornAfter = styled.div`
  &:after {
    content: " 🦄";
  }
`;

<UnicornAfter>I am a</UnicornAfter> // renders: "I am a 🦄"

If you post your code I'll likely be able to help debug your specific issue!

回答2:

This will print the triangle at middle of the div.

const LoginBackground = styled.div`
  & {
    width: 30%;
    height: 75%;
    padding: 0.5em;
    background-color: #f8d05d;
    margin: 0 auto;
    position: relative;
  }
  &:after {
    border-right: solid 20px transparent;
    border-left: solid 20px transparent;
    border-top: solid 20px #f8d05d;
    transform: translateX(-50%);
    position: absolute;
    z-index: -1;
    content: "";
    top: 100%;
    left: 50%;
    height: 0;
    width: 0;
  }
`;

回答3:

Can try like this.
It works perfectly fine

var setValue="abc";
var elementstyle = '<style>YourClass:before { right:' + abc + 'px;}</style>'
 $(".YourClass").append(setValue);

 var rightMarginForNotificationPanelConnectorStyle = '<style>.authenticated-page.dx-authenticated .dx-notification .dx-notification-dialog.dx-content-frame:before { right:' + rightMarginForNotificationPanelConnectorWithBadge + 'px;}</style>'
                        $(".authenticated-page.dx-authenticated .dx-notification .dx-notification-dialog.dx-content-frame").append(rightMarginForNotificationPanelConnectorStyle);

来源：https://stackoverflow.com/questions/45871439/before-and-after-pseudo-classes-used-with-styled-components

标签

reactjs

pseudo-class

styled-components