I try to come up with an example when to use each Vue.js lifecycle hook. For beforeMount() I can't come up with any use case. While researching I have als read:
Most likely we’ll never need to use this hook.
Can someone provide an example when I would like to use this lifecycle hook?
1 Answer
Best use case that I can come up with comes from Directly injecting data to Vue apps with Symfony/Twig. Before the mount happens, you can still see the actual, untransformed Element before it gets replaced by Vue. A particular piece that you can access is the data properties. In the example below, we lose data-fizz if we don't pull stuff out of it before we get to mounted.
const app = new Vue({ el: "#app", data() { return { foo: "bar" }; }, template: "<div>{{foo}}</div>", beforeMount() { console.log(this.$el); // <div></div> console.log(this.$el.dataset.fizz); // buzz }, mounted() { console.log(this.$el); // <div>bar</div> console.log(this.$el.dataset.fizz); // undefined }
});<script src=""></script>
<div></div>
