What is the best way to activate a function within an npm package in a Vue application?

I'm just starting out with Vuejs and I've recently installed the vue-countup-v2 npm package. I successfully imported it into my Vue component and noticed that it works perfectly when the page loads. However, I am interested in triggering the CountUp component when the user scrolls down the screen, rather than upon page load. The vue-countup-v2 package includes a method called start() which can be triggered for this purpose, but I'm unsure of how to do so.

Below is the code snippet:


  <template>
  <div id="main-wrapper" class="flex justify-around w-full p-12 my-12">
      <CountUp
           id="count-up"
           :delay="delay"
           :endVal="endVal[index]"
           :options="options"
      />
  </div>
  </template>

<script>
import CountUp from 'vue-countup-v2';
import inViewport from 'in-viewport';

export default {
  name: "NumberAnime",
  components: {
    CountUp,
  },

  data() {
    return {
      delay: 1000,
      endVal: [40, 300000, 25000, 350],
      options: {
        useEasing: true,
        useGrouping: true,
        separator: ',',
        decimal: '.',
        prefix: '',
        suffix: '',
      }
    }
  },

  mounted() {
    inViewport('elementId', 'the function I want to callback')
  },
}
</script>

Answer №1

For those looking for a solution in the future, here is how I resolved the issue:

To control the execution of code when scrolling down, set a v-if condition to false within the count tag, and then change it to true during scrolling to initiate the process.

<div id="before_count_div" class="text-4xl flex items-end">
            <CountUp
                v-if="options.begin == true"
                id="count"
                :delay="delay"
                :endVal="endVal[index]"
                :options="options"
            />
          </div>

In the data:

options: {
        useEasing: true,
        useGrouping: true,
        separator: ',',
        decimal: '.',
        prefix: '',
        suffix: '',
        begin: false,
      }

In the mounted:

mounted() {
    const el = document.getElementById('before_count_div');
    inViewport(el, () => {
      this.options.begin = true;
    })
  },

Answer №2

Based on my understanding, you can make use of the "ref" attribute with the CountUp component

<CountUp
       ref="counterRef"
/>

this.$refs.counterRef.start()

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