Creating Dynamic Themes in Angular with CSS Variables

Dynamic themes incorporated in contemporary web applications give users improved experience through their capability to change between different theme choices. CSS variables enable users to establish this functionality in Angular applications. Here are the essential steps to implement dynamic theme functionality within Angular:

Make a styles.css or styles.scss file then set theme variables within it:

/* Light Theme */
:root {
--primary-color: #ffffff;
--secondary-color: #f0f0f0;
--text-color: #000000;
}
/* Dark Theme */
.dark-theme {
--primary-color: #121212;
--secondary-color: #1e1e1e;
--text-color: #ffffff;
}

Make use of the defined variables when creating styles for components:

body {
background-color: var(--primary-color);
color: var(--text-color);
}
button {
background-color: var(--secondary-color);
color: var(--text-color);
}

A method in your component should serve to control theme switching functions:

toggleTheme(isDarkMode: boolean) {
if (isDarkMode) {
document.body.classList.add('dark-theme');
} else {
document.body.classList.remove('dark-theme');
}
}

The HTML page should include a toggle button.

<button (click)="toggleTheme(isDarkMode = !isDarkMode)">
Toggle Theme
</button>

The values for colors are established by CSS variables.

Document.body.classList.add() together with .remove() allows dynamic theme switching.

CSS variables activate automatically at the moment the class addition or removal is detected.

Angular implements dynamic theming through CSS variables in an easy and time-efficient manner. A user-friendly experience through theme variables definition lets you switch themes by adding or removing classes while keeping user-selected themes between sessions.

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