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Vue 3: Dynamic Class Binding implementation guide on Reactive Property Change

πŸ‘€ Views: 126 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-14
vue.js vue3 reactivity vue

I'm deploying to production and I'm performance testing and I've been working on this all day and I'm working with an scenario with dynamic class binding in my Vue 3 application where the class does not update when the related reactive property changes... I have a component that conditionally adds a class based on a property in the data object. Here’s a simplified version of my code: ```vue <template> <div :class="{ 'active-class': isActive }">Toggle Class</div> <button @click="toggleActive">Toggle Active</button> </template> <script> export default { data() { return { isActive: false }; }, methods: { toggleActive() { this.isActive = !this.isActive; } } }; </script> ``` I expected that clicking the button would toggle the `isActive` state and subsequently update the class on the `<div>`. However, when I debug, I see that `isActive` is indeed being toggled, but the class does not update in the DOM as expected. I checked the Vue DevTools, and the state is changing as expected, yet the class remains unchanged. I've also tried using `v-bind:class` explicitly like so: ```vue <div v-bind:class="{ 'active-class': isActive }"> ``` Nothing changes. I ensured that there are no CSS rules overriding the visibility of the class. I suspect it might be a reactivity scenario or something related to the way Vue handles updates. I'm using Vue 3.2.0 and Vue Router 4.0.0. Any insights on why the dynamic class binding isn't working as I expected would be appreciated! For context: I'm using Vue on Ubuntu. Thanks in advance! Thanks, I really appreciate it! What am I doing wrong? I'm developing on CentOS with Vue. Is this even possible?