In my vue app, I want the contents of a meta tag to be the result of a network request. To get this done, I'm learning quasar to make my app partially SSR, but I can't figure out how to run something async before a server-side render completes.
Here's a little MRE that isolates the problem. I try to delay with a promise, then set a value in the metaData
below....
<script>
import { defineComponent } from 'vue'
import { useMeta } from 'quasar'
const metaData = {
// sets document title
title: 'title initial value',
// optional; sets final title as "Index Page - My Website", useful for multiple level meta
titleTemplate: title => `The title is: ${title}`,
// meta tags
meta: {
// note: for Open Graph type metadata you will need to use SSR, to ensure page is rendered by the server
ogTitle: {
property: 'og:title',
// optional; similar to titleTemplate, but allows templating with other meta properties
template (ogTitle) {
return `${ogTitle} - My OG Website`
}
}
}
}
const delay = time => new Promise(resolve => setTimeout(resolve, time))
export default defineComponent({
async beforeCreate () {
await delay(3000)
// I want this to be in the rendered page
metaData.title = 'title, initialized after a delay'
},
setup () {
useMeta(metaData)
},
name: 'IndexPage'
})
</script>
I've proven that beforeCreate
is being executed, but I think what's happening is that it returns a promise on the await
, and the SSR just plows ahead. The initial value for title
ends up in the client's tag, instead of the one I want.
Is there a way I can use SSR but do some async work before rendering?
A way to handle asynchronous data in a server-side rendered Vue app is to use the asyncData
method. This method is called before the server-side render occurs. It allows you to perform asynchronous operations.
For example:
export default {
async asyncData({ params, $http }) {
const post = await $http.$get(`https://api.nuxtjs.dev/posts/${params.id}`)
return { post }
}
}
You can use the asyncData
method in Quasar by setting the ssr: true
option in your Quasar app's quasar.conf.js
file. You can then use the asyncData
method in your Vue components as shown in the example above.
More info: https://nuxtjs.org/docs/features/data-fetching/#async-data
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