Implementing a watcher property in JavaScript to dynamically add a class to an element

I'm currently facing an issue where I need to apply a class to an element when a certain data property changes. My approach involves using a watcher to monitor the value change and adding a class through JavaScript, as demonstrated in the code snippet below.

 <div class="ad-video" >
      
watch: {
  testAdActive() {
   document.querySelector('.ad-video').classList.add('ad-resize');
  }
}

Unfortunately, it seems that the above code is not functioning as expected, with the class 'ad-resize' failing to be added. Any suggestions on alternative approaches would be greatly appreciated.

Thank you, Jyoti

Answer №1

To tackle this issue, consider utilizing class-binding:

<div :class="{ 'ad-video': testAdActive }">

</div>

When the variable testAdActive is true, the class .ad-video will be added to your div.

The usage of : indicates v-bind.

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