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How to import logic using composition API in vue 3?

I have a vue 3 script setup component (composition api), and another file (for printing) that has some logic I want to inject into my main component.
My main file looks like
<template>
<v-app>
<v-main>
<v-table-mobile :headers="headers" :rows="rows" :items-per-page="itemsPerPage" no-data-text="No data to display" pagination-text="{0} - {1} of {2}" :sort-by="sortBy" :group-by="groupBy">
<template #item.a="{ item }">
{{ item.a }}
</template>
</v-table-mobile>
</v-main>
</v-app>
</template>
<script lang="ts">
import * as Print from './utils/print';
export Print;
</script>
<script setup lang="ts">
import { ref, onMounted } from 'vue';
import VTableMobile, { TableHeader, TableColumnSort, TableColumnGroup } from './components/MobileTable.vue';
const sortBy = ref({key:'a', order:'asc'} as TableColumnSort);
//const sortBy = ref({} as TableColumnSort);
const groupBy = ref({key:'a', expanded:[1] as any[]} as TableColumnGroup);
//const groupBy = ref({} as TableColumnGroup);
const itemsPerPage = ref(3);
const headers = ref([
{ key: "a", title: "a" },
{ key: "b", title: "b" }
] as TableHeader[]);
const rows = ref([
{ a:1, b:2 },
{ a:3, b:4 },
{ a:1, b:6 },
{ a:7, b:8 },
{ a:9, b:10 },
{ a:11, b:12 },
{ a:13, b:14 },
{ a:15, b:16 },
{ a:17, b:18 },
{ a:19, b:20 }
]);
onMounted(() => {
setTimeout(() => {
rows.value = rows.value.concat([ { a:21, b:22 } ]);
itemsPerPage.value = 4;
}, 3000);
})
</script>
The print file looks like
import { Ref, nextTick } from 'vue';
export default {
mounted() {
alert(1);
},
beforeUnmount() {
alert(2);
},
methods: {
async Print(print_mode:Ref<boolean>) {
print_mode.value = true;
await nextTick();
window.print();
},
DisablePrintMode(print_mode:Ref<boolean>) {
print_mode.value = false;
}
}
}
I want to add the mounted, beforeMount and the 2 methods to be injected into my main component. But this is not working. How can I fix it?
Right now I get an error
Declaration or statement expected.ts(1128) where the export Print is.
Thanks

Vue composables are designed for this.
Composables | VueJS
<!-- print file -->
<script setup>
import { onMounted, onUnmounted, nextTick } from 'vue'
/*
Other logic code
*/
async function Print(print_mode) {
print_mode.value = true;
await nextTick();
window.print();
},
function DisablePrintMode(print_mode) {
print_mode.value = false;
}
onMounted(() => {
// content of this hook
})
onUnmounted(() => {
// content of this hook
})
</script>
<!-- main file -->
<script setup>
import { usePrint } from './print.js'
const printFunc = usePrint()
</script>
I have written a sample code, you can take this reference to your code

How to get $refs using Composition API in Vue3?

I am trying to get $refs in Vue 3 using Composition API. This is my template that has two child components and I need to get reference to one child component instance:
<template>
<comp-foo />
<comp-bar ref="table"/>
</template>
In my code I use Template Refs: ref is a special attribute, that allows us to obtain a direct reference to a specific DOM element or child component instance after it's mounted.
If I use Options API then I don't have any problems:
mounted() {
console.log("Mounted - ok");
console.log(this.$refs.table.temp());
}
However, using Composition API I get error:
setup() {
const that: any = getCurrentInstance();
onMounted(() => {
console.log("Mounted - ok");
console.log(that.$refs.table.temp());//ERROR that.$refs is undefined
});
return {};
}
Could anyone say how to do it using Composition API?

You need to create the ref const inside the setup then return it so it can be used in the html.
<template>
<div ref="table"/>
</template>
import { ref, onMounted } from 'vue';
setup() {
const table = ref(null);
onMounted(() => {
console.log(table.value);
});
return { table };
}

On Laravel Inertia:
<script setup>
import { ref, onMounted } from "vue";
// a list for testing
let items = [
{ id: 1, name: "item name 1" },
{ id: 2, name: "item name 2" },
{ id: 3, name: "item name 3" },
];
// this also works with a list of elements
let elements = ref(null);
// testing
onMounted(() => {
let all = elements.value;
let item1 = all[0];
let item2 = all[1];
let item3 = all[2];
console.log([all, item1, item2, item3]);
});
</script>
<template>
<div>
<!-- elements -->
<div v-for="(item, i) in items" ref="elements" :key="item.id">
<!-- element's content -->
<div>ID: {{ item.id }}</div>
<div>Name: {{ item.name }}</div>
</div>
</div>
</template>

<template>
<your-table ref="table"/>
...
</template>
<script>
import { ref, onMounted } from 'vue';
setup() {
const table = ref(null);
onMounted(() => {
table.value.addEventListener('click', () => console.log("Event happened"))
});
return { table };
}
</script>
Inside your other component you can interact with events you already registered on onMounted life cycle hook as with my example i've registered only one evnet

If you want, you can use getCurrentInstance() in the parent component like this code:
<template>
<MyCompo ref="table"></MyCompo>
</template>
<script>
import MyCompo from "#/components/MyCompo.vue"
import { ref, onMounted, getCurrentInstance } from 'vue'
export default {
components : {
MyCompo
},
setup(props, ctx) {
onMounted(() => {
getCurrentInstance().ctx.$refs.table.tempMethod()
});
}
}
</script>
And this is the code of child component (here I called it MyCompo):
<template>
<h1>this is MyCompo component</h1>
</template>
<script>
export default {
setup(props, ctx) {
const tempMethod = () => {
console.log("temporary method");
}
return {
tempMethod
}
},
}
</script>

Vuejs how to use dynamical template in component?

const CustomComponent = {
props: ['index'],
template: `<span>I am a custom component: {{ index }}</span>`
};
const UserInputResult = {
components: {
CustomComponent
},
props: ['templateString'],
template: `<section v-html="templateString"></section>`
}
const app = new Vue({
el: '#app',
data(){
return {
userInput: 'user input example [:component-1]'
}
},
components: {
UserInputResult
},
methods: {
generateTemplate(){
let raw = this.userInput;
if (!!raw && raw.match(/\[\:component\-\d+\]/g)) {
let components = [...raw.match(/\[\:component\-\d+\]/g)];
components.forEach(component => {
raw = raw.replace(component, `<custom-component :index="${component.match(/\d+/)[0]}"></custom-component>`);
});
}
return raw;
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.16/vue.js"></script>
<div id="app">
<textarea v-model="userInput"></textarea>
<user-input-result :template-string="generateTemplate()">
</div>
I want to render a custom component which has a dynamical template base on user input.
when user input a specific string ([:component-1]), it will be render as a component (CustomComponent)
how to achieve this?
Thanks a lot for anyone help!

You should look into v-slot
https://v2.vuejs.org/v2/guide/components-slots.html
Example:
Parent:
<child-component v-html="myTemplate">
<span>From parent</span>
</child-component>
Child:
<div>
<v-slot></v-slot> //Will output "<span>From parent</span>"
</div>
**Added more explaination
You can then condition check and update myTemplate to your desired template. "<span>From parent</span>" is just there for explanation on how slot works.
updated by the questioner
const CustomComponent = {
props: ['index'],
template: `<span>I am a custom component: {{ index }}</span>`
};
const UserInputResult = {
template: `<section><slot></slot></section>`
}
const app = new Vue({
el: '#app',
data(){
return {
userInput: 'user input example [:component-1]'
}
},
components: {
UserInputResult,
CustomComponent
},
methods: {
generateTemplate(){
let raw = this.userInput;
if (!!raw && raw.match(/\[\:component\-\d+\]/g)) {
let components = [...raw.match(/\[\:component\-\d+\]/g)];
components.forEach(component => {
raw = raw.replace(component, `<custom-component :index="${component.match(/\d+/)[0]}"></custom-component>`);
});
}
return raw;
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.16/vue.js"></script>
<div id="app">
<textarea v-model="userInput"></textarea>
<user-input-result>
{{ generateTemplate() }}
</user-input-result>
</div>

I figured it out by using Vue.complie
according to dynamically-fetch-and-compile-a-template-with-nuxt
const UserInputResult = {
props: ['templateString'],
render(h){
return h({
components: {
CustomComponent
},
template: `<section>${this.templateString}</section>`
});
}
}

How to make nested routing in Vuejs?

HelloWorld.vue
import axios from "axios";
export const router = () => axios.get("https://fakestoreapi.com/products");
<template>
<div>
<div v-for="item in items" :key="item.id">
<b> id: {{ item.id }}</b>
<router-link
:to="`/${item.id}`"
>
{{ item.title }}
</router-link>
</div><!-- end v-for -->
<router-view></router-view>
</div>
</template>
<script>
import { router } from "./router";
export default {
name: "HelloWorld",
components: {},
data() {
return {
items: [],
};
},
mounted() {
router().then((r) => {
this.items = r.data;
});
},
};
</script>
User.vue
import axios from "axios";
export const routerid = (itemId) =>
axios.get("https://fakestoreapi.com/products/" + itemId);
<template>
<div>
<div v-if="item">
<h1>Price: {{ item.price }}</h1>
</div>
<tabs />
</div>
</template>
<script>
import { routerid } from "./routerid";
import tabs from "./tabs";
export default {
name: "User",
components: {
tabs,
},
data() {
return {
item: null,
};
},
mounted() {
this.loadData();
},
computed: {
routeId() {
return this.$route.params.id;
},
},
watch: {
routeId() {
console.log("Reload (route change)");
this.loadData();
}, //reload when route id changes
},
methods: {
loadData() {
console.log("Reloading, ID", this.routeId);
if (!this.routeId) return; // no ID, leave early
routerid(this.$route.params.id).then((item) => {
this.item = item.data;
});
},
},
};
</script>
tabs.vue
import axios from "axios";
export const tabsandcontent = async (itemId) =>
await axios.get("https://fakestoreapi.com/products?limit=" + itemId);
<template>
<div>
<div v-if="item">
<h1>description: {{ item.description }}</h1>
</div>
</div>
</template>
<script>
import { tabsandcontent } from "./tabsandcontent";
export default {
name: "User",
components: {},
data() {
return {
item: null,
};
},
mounted() {
this.loadData();
},
computed: {
tabsandcontent() {
return this.$route.params.id;
},
},
watch: {
tabsandcontent() {
console.log("Reload (route change)");
this.loadData();
}, //reload when route id changes
},
methods: {
loadData() {
console.log("Reloading, ID", this.tabsandcontent);
if (!this.tabsandcontent) return; // no ID, leave early
tabsandcontent(this.$route.params.id).then((item) => {
this.item = item.data;
});
},
},
};
</script>
main.js
import Vue from "vue";
import App from "./App.vue";
import VueRouter from "vue-router";
import HelloWorld from "./components/HelloWorld";
import User from "./components/User";
Vue.use(VueRouter);
const router = new VueRouter({
routes: [
{
path: "/HelloWorld",
name: "HelloWorld",
component: HelloWorld,
children: [{ path: ":id", name: "User", component: User }]
}
]
});
Vue.config.productionTip = false;
new Vue({
router,
render: (h) => h(App)
}).$mount("#app");
code:- https://codesandbox.io/s/combined-logic-api-forked-41lh0f?file=/src/main.js
can you please answer this, In main.js routing I changed from path: "/" to path: "/HelloWorld" then all of sudden output not reflecting... because in my project path:'/' indicates login page??? In this scenario what changes, i need to make, to make logic work
also where is the relation between path:'/' and api call??

You have same name for the variables in tabs component (In watch and computed). And In tabsandcontent.js, you have missed to fetch description for the specific item as performed in routerId.js.
Have a look at modified version which is working as you expected.
https://codesandbox.io/embed/combined-logic-api-forked-ji5oh4?fontsize=14&hidenavigation=1&theme=dark

First thing first, I want you to know that I don't understand what are you asking for. But I'm going to try to answer.
Your first question:
In main.js routing I changed from path: "/" to path: "/HelloWorld" then all of sudden output not reflecting.
Yes, you will not see your HelloWorld.vue component. You can see your page however if you type <your-url>/HelloWorld. Usually the / path is used for something like "Home" page.
However, I've tried checking out your codesandbox. And take a look at your HelloWorld.vue component.
I think you are confused because when you changed the path from / to /HelloWorld apart from the HelloWorld.vue not showing up. It somehow broken the link which causes the API in tabs.vue not functioning.
If that's the case, you just have to simply add HelloWorld/${item.id} in tabs.vue,
<template>
<div>
<div v-for="item in items" :key="item.id">
<b> id: {{ item.id }}</b>
<router-link
:to="`HelloWorld/${item.id}`" // --> Notice this line
>
{{ item.title }}
</router-link>
</div><!-- end v-for -->
<router-view></router-view>
</div>
</template>
This however, isn't a common thing to do routing. You should add your App URLs to main.js. Which also isn't common, but I'm assuming this is just a little reproduction code you made for StackOverflow.
Here are my CodeSandbox edits.
https://codesandbox.io/s/combined-logic-api-forked-jttt8p
I will update the answer again later, I'm still not on my personal laptop.

Getter should be a function but "getters.doubleCounter" is 20 - VUEX ERROR

I'm learning about Vuex right now and I'm running into some trouble. While trying to create a getter on my vuex instance I'm getting this error when trying to render from one of my components:
Getter should be a function but "getters.doubleCounter" is 20
store.js
import Vue from 'vue';
import Vuex from 'vuex';
Vue.use(Vuex);
export default new Vuex.Store({
state: {
counter: 10
},
getters: {
doubleCounter: state => {
return state.counter * 2;
}
}
});
MY COMPONENT:
<template>
<div>
<p>This is a message from services</p>
<button v-on:click="increment">+</button>
<button v-on:click="decrement">-</button>
{{ counter }}
</div>
</template>
<script>
export default {
computed: {
counter() {
return this.$store.getters.doubleCounter;
},
},
methods: {
increment: function () {
this.$store.state.counter++
},
decrement: function () {
this.$store.state.counter--
}
}
}
</script>
Again when I try to render the page that this component is on. It fails while giving me the title error message in the console. Any help would be great! Thanks!

Try this.
doubleCounter: (state) => {
return state.counter * 2;
}

I'm not sure what's causing your error but you are certainly not meant to be directly manipulating state outside of a mutation.
At no point should your code ever assign anything directly to a state property. For example, this is bad
this.$store.state.doubleCounter++
Here's what you should have.
Vue.component('counter', {
template: `
<div>
<p>This is a message from services</p>
<button v-on:click="increment">+</button>
<button v-on:click="decrement">-</button>
{{ counter }}
</div>
`,
computed: {
counter() {
return this.$store.getters.doubleCounter;
},
},
methods: {
increment: function () {
this.$store.commit('increment')
},
decrement: function () {
this.$store.commit('decrement')
}
}
})
const store = new Vuex.Store({
state: {
counter: 10
},
mutations: {
increment(state) { state.counter++ },
decrement(state) { state.counter-- }
},
getters: {
doubleCounter: state => {
return state.counter * 2;
}
}
})
new Vue({
el: '#app',
store
})
<script src="https://cdn.jsdelivr.net/npm/vue#2.5.13/dist/vue.js"></script>
<script src="https://unpkg.com/vuex#3.0.1/dist/vuex.js"></script>
<div id="app"><counter/></div>