<script>
export default {
setup() {
}
created() {
}
}
</script>
When i change to use script setup syntax, how to use created hook ?
<setup script>
// how to use created hook ?
</script>
As you can see here, there is no such thing as created in Composition API lifecycle: https://vuejs.org/api/composition-api-lifecycle.html
Because it happens before the actual creation
All APIs listed on this page must be called synchronously during the setup() phase of a component. See Guide - Lifecycle Hooks for more details.
created hook coming just after as shown here: https://vuejs.org/guide/essentials/lifecycle.html#lifecycle-diagram
Related
Here is the scenario, I have a component, and inside the script tag I am calling an action
<script>
if (something is true) {
await store.doSomething()
}
</script>
The component fails to mount.
When I use the onMounted hook, it seems to work.
I am beginner in Vue, but my question is what is really happening when I don't use the hook? and is it always necessary to use hook when making asynchronous calls ?
Put it inside onMounted to get it to work, although ran into other test failures afterwards.
Looking at what you wrote as of right now, you should have the Options API like this
<script>
export default {
mounted() {
// your code
},
setup() {
// can also use setup here
}
}
</script>
With Composition API (notice the setup)
<script setup>
onMounted(() => {
// your code
})
</script>
In 2., if you don't use onMounted it will be run withing the setup lifecycle as shown here.
is it always necessary to use hook when making asynchronous calls ?
Not really, but at the same time it depends on when/how you want it to run. Start by running it into mounted initially yep, easier and safer to understand overall.
Especially since setup does not re-run when re-mounted, can be quite confusing.
It also depends exactly on what is something is true exactly, regarding the lifecycle + state.
Pinia and Vitest will get their own things to think about.
I recommend reading the documentation and getting an initial grasp before proceeding.
Could you advise what is the equivalent of the created() in the new Vue composition API, which I'm using from within Vue2 like this:
import { reactive, toRefs } from '#vue/composition-api'
From the Composition API docs on Lifecycle Hooks:
Because setup is run around the beforeCreate and created lifecycle hooks, you do not need to explicitly define them. In other words, any code that would be written inside those hooks should be written directly in the setup function.
Anything you would have done in the created hook you can do in setup.
to help the community, the created() method can be used this way.
hope this helps :)
<script>
import TenantsAPI from "#/api/tenants";
export default {
setup() {
const tenantsAPI = new TenantsAPI(); //compositon api
};
}
//options api
//async created(){
// this.tenantsAPI = new TenantsAPI();
//}
</script>
Is this instance lifecycle hooks diagram also valid(the same) for a vue.js single file component or a global component(vue.componnet())? or is it only used for a Vue instance(new Vue)??
thanks.
Yes, these lifecycle hooks are there for all vue instances: SFCs, global components, explicit new Vue, vue-test-utils wrappers, and so on.
The only thing that SFC do are to write the .render method for you because it's way simpler to write it with an html-like syntax rather than write the render function manually.
In an SFC, you'd tap into them as such:
<script>
export default {
created() {
// do something on created
}
}
</script>
In an explicit new Vue, like this:
new Vue({
created() {
// do something on created
}
});
You get the point.
I'm building server UI and I'm struggling with components. Maybe someone knows how to stack all components and control all UI with functions?
example
App.vue
chat.vue
hud.vue
player.vue
I need to display all .vue in app.vue
App.vue
import chat from './components/chat.vue'
export default {
name: 'app',
components: {
chat
}
}
chat.vue
export default {
methods: {
test: function() {
console.log("test");
}
}
}
How can I call the function test in the DevTools console, when I run the webiste?
Do you know about the Vue Dev Tools browser extension? That will let you inspect all components on a page and tweak their data/props.
I don't think it will let you call their methods, but if you need to call one of those methods in the console you might try (temporarily, for testing purposes) making a component instance available on the window inside a mounted lifecycle function.
EDIT: Is that your entire App.vue, by the way? I'm thinking maybe I misunderstood your question and you think that...
components: {
chat
}
...means that it should render the component on the page. It only makes it available for the parent component to use. You have to place it inside a <template> to actually render it.
I am trying to create some plugins according to this article:
https://alligator.io/vuejs/creating-custom-plugins/
I have a plugin that needs to run something when the root Vue instance mounts or is created. So far I can only see a way to inject something into all components which is not what I would want.
I simply need to do something when the main Vue instance mounts. How can I do this with a plugin?
The install method from the plugin does not seem to do the trick because this seems to happen before the actual created method.
It's possible to have multiple root Vue components. A "root component" is just a component created with the new syntax and no parent component, so you can detect this as follows:
Vue.mixin({
created() {
if (!this.$parent) {
// This is either the root component or a component
// created with `new` and no parent
}
}
})
It's actually easy to include mixins for just a particular component!
In your component that you want to add the mixin to, just import it like you would anything else, and include an array in your component called mixins like so:
import myMixin from 'src/mixin/myMixin'
export default {
mixins: [myMixin]
}
Then your myMixin code would look like this (don't use Vue.mixin, which is global):
export default {
beforeMount () {
console.log('Your component is about to be mounted!')
}
}