Vue.js v-bind:style Pseudo element :: after content icon

Question

I have a Bootstrap Vue ProgressBar. I need to add to the class ".progress-bar" pseudo element :: after with content icon (from FontAwsome). And I also want it to be dynamic. Because I have implemented steps in my ProgressBar(from 0 tp 100) and i want, when i click, this icon will go with ProgressBar line.

<b-progress v-bind:style="styleProgressBar" :value="counter" :max="max"></b-progress>

 export default {
        components:{
            'navbar':navbar
        },
        name: "myPage",
        data() {
            return {
                counter: 0,
                max: 100,
                step:1,
            }
        },
        methods:{
            prev() {
                this.step--;
            },
            next() {
                this.step++;
                if (this.counter < 100) {
                    this.counter += 34;
                }
            }
        }
    }

I also saw this: https://v2.vuejs.org/v2/guide/class-and-style.html

<div v-bind:style="styleObject"></div>

data: {
  styleObject: {
    color: 'red',
    fontSize: '13px'
  }
}

Answer 1

Let's say you have a parent component:

<div id="parent">
  <ChildComponent id="child"> // Possibly from another library?
</div>

// renders ->

<div id="parent">
   <div id="child">
     <div id="child-component-item">
        ::after
     </div>
   </div>
</div>

The challenge is creating a binding for the #child-component-item:after selector.

We can use css vars to solve this problem, by "reaching into" the child component with some CSS. Note that you may have to use ::v-deep if your style is scoped.

parent-component.js

<div id="parent-component" :style="{'--bgColor': bgColor}">
   <ChildComponent>
</div>

<script>
  export default {
    data() {
      return {
        bgColor: 'red'
      }
    }
  }
</script>

<style>
   #child-component-item:after {
      background-color: var(--bgColor)
   }
</style>

Answer 2

Use css var()

And then :style="{ '--varName': xxx}"