What is the best way to monitor a document variable that is set after a component has been

Is there a way to access the variable document.googleAnalytics, added by Google Tag Manager, for A/B testing on a Vue.js page? I attempted to initialize the variable in both the mounted and created methods of the component, but it returns as undefined:

export default {
  data() {
    return {
      myVar: null,
    }
  },

  mounted() {
    this.myVar = document.googleAnalytics; // undefined
  }
}

I also tried using a watcher for myVar, but it did not resolve the issue:

watch: {
  myVar(val) {
    this.myVar = val;
  }
}

Is it possible to retrieve the value from the document if the Tag Manager script is loaded after Vue has already been loaded and rendered?

Answer №1

One option to consider is utilizing the Vue 'NextTick' function like so:

mounted() {
  this.$nextTick(function () {
    // Code that will execute after the
    // entire view has finished rendering
    this.myVar = val;
  })
}

To learn more about the Mounted lifecycle step, check out: https://v2.vuejs.org/v2/api/#mounted

Additionally, this resource provides a helpful explanation of 'NextTick':

Give it a try and share your experience with me.

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