:class="{ active: isActive }"adds the class when the value is true.- Arrays:
:class="[base, extra]" :style="{ color: textColor, fontSize: size + 'px' }"
Vue Class & Style Bindings
Dynamic classes and inline styles.
✍️ 3 exercises + code challenge in this lessonKey Takeaways: Vue Class & Style Bindings
Mastering Vue Class & Style Bindings helps you write clean and reliable Vue.js code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
Vue Class & Style Bindings Code Example
Vue.js<script src="https://unpkg.com/vue@3.5.12/dist/vue.global.prod.js"></script>
<style>
.done { text-decoration: line-through; color: #94a3b8; }
</style>
<div id="app">
<p v-for="t in tasks" :key="t.text" :class="{ done: t.done }" @click="t.done = !t.done">{{ t.text }}</p>
<p :style="{ color: color, fontSize: size + 'px' }">Styled text</p>
</div>
<script>
Vue.createApp({
data() {
return { tasks: [ { text: "Learn Vue", done: true }, { text: "Build an app", done: false } ], color: "#42b883", size: 22 };
}
}).mount("#app");
</script>
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Vue Class & Style Bindings Practice Exercises
Check what you learned in “Vue Class & Style Bindings”.
/ 3 solved
Fill in the blank
Add the class "active" when isActive is true.
<div :class="{ : isActive }"></div>
✓ Correct!
Not quite. Try again.
Multiple choice
How do you bind an inline style?
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Code challenge
Add the class "highlight" to the <p> when important is true, using :class.
Write the code in the live editor. Your answer is checked automatically.
✓ Solved
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