Detect System Theme Preference Change Using JavaScript

Date:


JavaScript and CSS allow users to detect the user theme preference with CSS’ prefers-color-scheme media query. It’s standard these days to use that preference to show the dark or light theme on a given website. But what if the user changes their preference while using your app?

To detect a system theme preference change using JavaScript, you need to combine matchMedia, prefers-color-scheme, and an event listener:

window.matchMedia('(prefers-color-scheme: dark)')
      .addEventListener('change',({ matches }) => {
  if (matches) {
    console.log("change to dark mode!")
  } else {
    console.log("change to light mode!")
  }
})

The change event of the matchMedia API notifies you when the system preference changes. You can use this event to automatically update the site’s display in real time.

I love that this API allows detecting user preference on a system level. Catering to user needs is an important part of creating a great web experience!

  • Responsive Images: The Ultimate Guide

    Chances are that any Web designers using our Ghostlab browser testing app, which allows seamless testing across all devices simultaneously, will have worked with responsive design in some shape or form. And as today’s websites and devices become ever more varied, a plethora of responsive images…

  • CSS Gradients

    With CSS border-radius, I showed you how CSS can bridge the gap between design and development by adding rounded corners to elements.  CSS gradients are another step in that direction.  Now that CSS gradients are supported in Internet Explorer 8+, Firefox, Safari, and Chrome…

  • Reverse Element Order with CSS Flexbox

    CSS is becoming more and more powerful these days, almost to the point where the order of HTML elements output to the page no longer matters from a display standpoint — CSS lets you do so much that almost any layout, large or small, is possible.  Semantics…

  • Introducing MooTools Templated

    One major problem with creating UI components with the MooTools JavaScript framework is that there isn’t a great way of allowing customization of template and ease of node creation. As of today, there are two ways of creating: new Element Madness The first way to create UI-driven…



Source link

Share post:

[tds_leads title_text="Subscribe" input_placeholder="Email address" btn_horiz_align="content-horiz-center" pp_checkbox="yes" pp_msg="SSd2ZSUyMHJlYWQlMjBhbmQlMjBhY2NlcHQlMjB0aGUlMjAlM0NhJTIwaHJlZiUzRCUyMiUyMyUyMiUzRVByaXZhY3klMjBQb2xpY3klM0MlMkZhJTNFLg==" f_title_font_family="653" f_title_font_size="eyJhbGwiOiIyNCIsInBvcnRyYWl0IjoiMjAiLCJsYW5kc2NhcGUiOiIyMiJ9" f_title_font_line_height="1" f_title_font_weight="700" f_title_font_spacing="-1" msg_composer="success" display="column" gap="10" input_padd="eyJhbGwiOiIxNXB4IDEwcHgiLCJsYW5kc2NhcGUiOiIxMnB4IDhweCIsInBvcnRyYWl0IjoiMTBweCA2cHgifQ==" input_border="1" btn_text="I want in" btn_tdicon="tdc-font-tdmp tdc-font-tdmp-arrow-right" btn_icon_size="eyJhbGwiOiIxOSIsImxhbmRzY2FwZSI6IjE3IiwicG9ydHJhaXQiOiIxNSJ9" btn_icon_space="eyJhbGwiOiI1IiwicG9ydHJhaXQiOiIzIn0=" btn_radius="3" input_radius="3" f_msg_font_family="653" f_msg_font_size="eyJhbGwiOiIxMyIsInBvcnRyYWl0IjoiMTIifQ==" f_msg_font_weight="600" f_msg_font_line_height="1.4" f_input_font_family="653" f_input_font_size="eyJhbGwiOiIxNCIsImxhbmRzY2FwZSI6IjEzIiwicG9ydHJhaXQiOiIxMiJ9" f_input_font_line_height="1.2" f_btn_font_family="653" f_input_font_weight="500" f_btn_font_size="eyJhbGwiOiIxMyIsImxhbmRzY2FwZSI6IjEyIiwicG9ydHJhaXQiOiIxMSJ9" f_btn_font_line_height="1.2" f_btn_font_weight="700" f_pp_font_family="653" f_pp_font_size="eyJhbGwiOiIxMyIsImxhbmRzY2FwZSI6IjEyIiwicG9ydHJhaXQiOiIxMSJ9" f_pp_font_line_height="1.2" pp_check_color="#000000" pp_check_color_a="#ec3535" pp_check_color_a_h="#c11f1f" f_btn_font_transform="uppercase" tdc_css="eyJhbGwiOnsibWFyZ2luLWJvdHRvbSI6IjQwIiwiZGlzcGxheSI6IiJ9LCJsYW5kc2NhcGUiOnsibWFyZ2luLWJvdHRvbSI6IjM1IiwiZGlzcGxheSI6IiJ9LCJsYW5kc2NhcGVfbWF4X3dpZHRoIjoxMTQwLCJsYW5kc2NhcGVfbWluX3dpZHRoIjoxMDE5LCJwb3J0cmFpdCI6eyJtYXJnaW4tYm90dG9tIjoiMzAiLCJkaXNwbGF5IjoiIn0sInBvcnRyYWl0X21heF93aWR0aCI6MTAxOCwicG9ydHJhaXRfbWluX3dpZHRoIjo3Njh9" msg_succ_radius="2" btn_bg="#ec3535" btn_bg_h="#c11f1f" title_space="eyJwb3J0cmFpdCI6IjEyIiwibGFuZHNjYXBlIjoiMTQiLCJhbGwiOiIxOCJ9" msg_space="eyJsYW5kc2NhcGUiOiIwIDAgMTJweCJ9" btn_padd="eyJsYW5kc2NhcGUiOiIxMiIsInBvcnRyYWl0IjoiMTBweCJ9" msg_padd="eyJwb3J0cmFpdCI6IjZweCAxMHB4In0="]
spot_imgspot_img

Popular

More like this
Related