Vaadin: change CSS variables dynamically

Question

Is there a way to change dynamically the lumo primary colors:

html {
  --lumo-primary-text-color: hsl(214, 35%, 15%);
  --lumo-primary-color-50pct: rgba(140, 236, 0, 0.5);
  --lumo-primary-color-10pct: rgba(140, 236, 0, 0.1);
  --lumo-primary-color: #8CEC00;
  --lumo-primary-contrast-color: hsl(214, 35%, 15%);
}

Thanks in advance!

Best Regards, Thomas

Hi! This is likely useful to you: demo.vaadin.com/lumo-editor — Jouni
– Jouni, Commented May 14, 2021 at 10:09
Hello! I used the theme editor to get my colors. But how can I change this live in the application? — Thomas
– Thomas, Commented May 14, 2021 at 10:15
@Thomas So you mean you want to change them programmatically at runtime? Like let the user change some color? If so, do you want to do it in Java? — Tarek Oraby
– Tarek Oraby, Commented May 14, 2021 at 10:18
Hello Tarek! Yes, I want to change to colors during runtime. — Thomas
– Thomas, Commented May 14, 2021 at 10:35

Tarek Oraby · Accepted Answer · 2021-05-14 10:50:22Z

9

The CSS variables can be updated dynamically from Java like so

UI.getCurrent().getElement().getStyle().set("--lumo-primary-text-color", "hsl(214, 35%, 15%)")

This will update the variable's value for the whole UI. If you want to change the variable only for a specific component (and its children), then you can call getElement().getStyle().set() on that component only.

answered May 14, 2021 at 10:50

Tarek Oraby

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1 Comment

Thomas Over a year ago

Wow, so easy! Thank you :)

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