Linking a watcher property to control the opacity value of inline styles

Struggling to connect the opacity of a div with the value of a slider.

<div class="container" v-bind:style="opacity">test content</div>

Despite my efforts, I can't seem to make the binding work correctly. When I check in the developer tools, I see that the div is being bound to the object instead of the style itself.

My watcher function looks like this:

watch:{
opacity: function(oldValue, newValue) {
            console.log(this.opacity);
            return {
                '"style"':this.opacity
            }
        },
},...

The console shows the correct opacity values ranging from 0-1. They appear like this: https://i.sstatic.net/5Tvgw.png

I'm puzzled by what's going wrong with the inline binding. Any assistance would be highly appreciated!

javascripthtmlcssvue.js

Answer №1

In the case where `opacity` is a number, you will need to implement it as follows:

<div class="container" v-bind:style="{opacity: opacity}">test content</div>

Within `{opacity: opacity}`, the first part represents the CSS property name while the second part represents the `data` vue property name.

It is important to note the usage of the watcher:

watch:{
opacity: function(oldMessage, newMessage) {
            console.log(this.opacity);
            return {
                '"style"':this.opacity
            }
        },
},...

However, this implementation seems illogical as watchers are not meant to return values. Therefore, returning that object serves no real purpose. It is possible that what you intended was actually creating a computed property:

new Vue({
  el: '#app',
  data: {
    opacity: 0.5
  },
  computed: {
    containerStyle() {
      return {opacity: this.opacity}
    }
  }
})
<script src="https://unpkg.com/vue"></script>

<div id="app">
  <input type="range" min="0" max="1" value="0.5" step="0.01" v-model="opacity"> {{ opacity }}
  <div class="container" v-bind:style="containerStyle">TEST CONTENT</div>
</div>

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