When editing a component, the vue data state will reset after an hmr update.
<template>
<div>
{{ count }} <button #click="count++">increment</button>
</div>
</template>
<script>
export default {
data() {
return {
count: 0
};
}
};
</script>
Increment count 2 times and change the template (e.g. add another button). The count will display 0 again after an hmr update.
Try it here: https://stackblitz.com/edit/vite-vue2
Am i missing a vite.config.js setting, or is it something else?
Related
I have a weird situation with my Vue3 component. I am trying to get a value from the props inside the setup() function. But this returns nothing.
<template>
<div class="border p-2 space-y-2">
<h2 class="text-center">Makers</h2>
{{ product.makers }}
</div>
</template>
<script>
import { ref, onMounted, toRef, toRefs } from 'vue'
import ProductStore from '../store/ProductStore'
export default {
props: {
product: Object
},
setup(props) {
console.log(props.product.makers)
},
}
</script>
The value is sent from another component like the one below
<ProductMakers :product="product"/>
But I always get undefined as my response. Any clue to resolve this problem? Am I missing something?
To my surprise, the template is always showing the value correctly. The problem is only inside the setup(). Any clue?
This means that product is reactively updated after the creation of component instance.
Updated value is supposed to be accessed in a watcher or a computed. In case a side effect like logging is needed, this is the case for a watcher:
setup(props) {
watchEffect(() => {
if (props.product.makers)
console.log(props.product.makers)
});
},
I've multiple (20+) pages where I need the following code:
<template>
<template v-if="isLoading">
<Spinner full size="medium" />
</template>
<template v-else>
<p>Page data</p>
</template>
</template>
<script>
export default {
computed: {
isLoading() {
return this.$store.getters['loader/isLoading'];
},
},
};
</script>
I don't want to rewrite this part everytime I need it so is there a way to create something like a higher order component with access to the computed method and a way to add the hoc to the script tag of the different vue files? Or another way to archive this?
I could recommend extending the spinner component where you want to show the spinner. I've created a boilerplate setup that show a very simple implementation of this approach here.
The main idea is to expose a default slot for you spinner component, and wrap the page component in that slot.
<template>
<div>
<Spinner v-if="isLoading" full size="medium" />
<!-- Slot for component data -->
<slot v-else></slot>
</div>
</template>
<script>
export default {
computed: {
isLoading() {
return this.$store.getters['loader/isLoading'];
},
},
};
</script>
Then in any component that you want to show the spinner:
<template>
<spinner>
<!-- Pass here the component content to be shown after the spinner is hidden -->
</spinner>
</template>
<script>
import Spinner from "./spinner";
export default {
name: "Page1",
extends: Spinner,
components: { Spinner }
};
</script>
I am new to Vuejs, I am using 4 different components, where in every component i have called the API. Here 4 different components are all same except their contents.
Now, i want to make my code effective, so i want to have a single component, the reason why i created different components is my another App.vue component has 4 different buttons, so whenever you click any of it, it will open the respective component.
But now i want to have only one component instead of four different components, and whenever the buttons in App.vue component is clicked it should open the exact content in single component(instead of 4 components).
Please do help me with this, by sharing your ideas and if any examples.
In this context, you can use props, which is a way of passing data to "child" components.
https://v2.vuejs.org/v2/guide/components-props.html
Example
App.vue
<template>
<div id="app">
<SingleComponent :button="button" />
</div>
</template>
<script>
import SingleComponent from "#/components/SingleComponent.vue";
// #/ means src/
export default {
name: "App",
components: {
SingleComponent,
},
data: () => ({
button: 2,
}),
};
</script>
SingleComponent.vue
<template>
<div>
<button v-if="button === 0">...</button>
<button v-else-if="button === 1">...</button>
<button v-else-if="button === 2">...</button>
<button v-else-if="button === 3">...</button>
</div>
</template>
<script>
export default {
name: "SingleComponent",
props: {
button: {
type: Number,
required: true,
},
},
};
</script>
You should also take a look at slots, it is very important in Vue.js and that could also solve your problem.
https://v2.vuejs.org/v2/guide/components-slots.html
I am terribly new to Vue, so forgive me if my terminology is off. I have a .NET Core MVC project with small, separate vue pages. On my current page, I return a view from the controller that just has:
#model long;
<div id="faq-category" v-bind:faqCategoryId="#Model"></div>
#section Scripts {
<script src="~/scripts/js/faqCategory.js"></script>
}
Where I send in the id of the item this page will go grab and create the edit form for. faqCategory.js is the compiled vue app. I need to pass in the long parameter to the vue app on initialization, so it can go fetch the full object. I mount it with a main.ts like:
import { createApp } from 'vue'
import FaqCategoryPage from './FaqCategoryPage.vue'
createApp(FaqCategoryPage)
.mount('#faq-category');
How can I get my faqCategoryId into my vue app to kick off the initialization and load the object? My v-bind attempt seems to not work - I have a #Prop(Number) readonly faqCategoryId: number = 0; on the vue component, but it is always 0.
My FaqCategoryPAge.vue script is simply:
<script lang="ts">
import { Options, Vue } from "vue-class-component";
import { Prop } from 'vue-property-decorator'
import Card from "#/Card.vue";
import axios from "axios";
import FaqCategory from "../shared/FaqCategory";
#Options({
components: {
Card,
},
})
export default class FaqCategoryPage extends Vue {
#Prop(Number) readonly faqCategoryId: number = 0;
mounted() {
console.log(this.faqCategoryId);
}
}
</script>
It seems passing props to root instance vie attributes placed on element the app is mounting on is not supported
You can solve it using data- attributes easily
Vue 2
const mountEl = document.querySelector("#app");
new Vue({
propsData: { ...mountEl.dataset },
props: ["message"]
}).$mount("#app");
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app" data-message="Hello from HTML">
{{ message }}
</div>
Vue 3
const mountEl = document.querySelector("#app");
Vue.createApp({
props: ["message"]
}, { ...mountEl.dataset }).mount("#app");
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/3.0.0/vue.global.js"></script>
<div id="app" data-message="Hello from HTML">
{{ message }}
</div>
Biggest disadvantage of this is that everything taken from data- attributes is a string so if your component expects something else (Number, Boolean etc) you need to make conversion yourself.
One more option of course is pushing your component one level down. As long as you use v-bind (:counter), proper JS type is passed into the component:
Vue.createApp({
components: {
MyComponent: {
props: {
message: String,
counter: Number
},
template: '<div> {{ message }} (counter: {{ counter }}) </div>'
}
},
}).mount("#app");
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/3.0.0/vue.global.js"></script>
<div id="app">
<my-component :message="'Hello from HTML'" :counter="10" />
</div>
Just an idea (not a real problem)
Not really sure but it can be a problem with Props casing
HTML attribute names are case-insensitive, so browsers will interpret any uppercase characters as lowercase. That means when you're using in-DOM templates, camelCased prop names need to use their kebab-cased (hyphen-delimited) equivalents
Try to change your MVC view into this:
<div id="faq-category" v-bind:faq-category-id="#Model"></div>
Further to Michal Levý's answer regarding Vue 3, you can also implement that pattern with a Single File Component:
app.html
<div id="app" data-message="My Message"/>
app.js
import { createApp } from 'vue';
import MyComponent from './my-component.vue';
const mountEl = document.querySelector("#app");
Vue.createApp(MyComponent, { ...mountEl.dataset }).mount("#app");
my-component.vue
<template>
{{ message }}
</template>
<script>
export default {
props: {
message: String
}
};
</script>
Or you could even grab data from anywhere on the parent HTML page, eg:
app.html
<h1>My Message</h1>
<div id="app"/>
app.js
import { createApp } from 'vue';
import MyComponent from './my-component.vue';
const message = document.querySelector('h1').innerText;
Vue.createApp(MyComponent, { message }).mount("#app");
my-component.vue
<template>
{{ message }}
</template>
<script>
export default {
props: {
message: String
}
};
</script>
To answer TheStoryCoder's question: you would need to use a data prop. My answers above demonstrate how to pass a value from the parent DOM to the Vue app when it is mounted. If you wanted to then change the value of message after it was mounted, you would need to do something like this (I've called the data prop myMessage for clarity, but you could also just use the same prop name message):
<template>
{{ myMessage }}
<button #click="myMessage = 'foo'">Foo me</button>
</template>
<script>
export default {
props: {
message: String
},
data() {
return {
myMessage: this.message
}
}
};
</script>
So I'm not at all familiar with .NET and what model does, but Vue will treat the DOM element as a placeholder only and it does not extend to it the same functionality as the components within the app have.
so v-bind is not going to work, even without the value being reactive, the option is not there to do it.
you could try a hack to access the value and assign to a data such as...
const app = Vue.createApp({
data(){
return {
faqCategoryId: null
}
},
mounted() {
const props = ["faqCategoryId"]
const el = this.$el.parentElement;
props.forEach((key) => {
const val = el.getAttribute(key);
if(val !== null) this[key] = (val);
})
}
})
app.mount('#app')
<script src="https://unpkg.com/vue#3.0.0-rc.11/dist/vue.global.prod.js"></script>
<div id="app" faqCategoryId="12">
<h1>Faq Category Id: {{faqCategoryId}}</h1>
</div>
where you get the value from the html dom element, and assign to a data. The reason I'm suggesting data instead of props is that props are setup to be write only, so you wouldn't be able to override them, so instead I've used a variable props to define the props to look for in the dom element.
Another option
is to use inject/provide
it's easier to just use js to provide the variable, but assuming you want to use this in an mvc framework, so that it is managed through the view only. In addition, you can make it simpler by picking the exact attributes you want to pass to the application, but this provides a better "framework" for reuse.
const mount = ($el) => {
const app = Vue.createApp({
inject: {
faqCategoryId: {
default: 'optional'
},
},
})
const el = document.querySelector($el)
Object.keys(app._component.inject).forEach(key => {
if (el.getAttribute(key) !== null) {
app.provide(key, el.getAttribute(key))
}
})
app.mount('#app')
}
mount('#app')
<script src="https://unpkg.com/vue#3.0.0-rc.11/dist/vue.global.prod.js"></script>
<div id="app" faqCategoryId="66">
<h1>Faq Category Id: {{faqCategoryId}}</h1>
</div>
As i tried in the following example
https://codepen.io/boussadjra/pen/vYGvXvq
you could do :
mounted() {
console.log(this.$el.parentElement.getAttribute("faqCategoryId"));
}
All other answers might be valid, but for Vue 3 the simple way is here:
import {createApp} from 'vue'
import rootComponent from './app.vue'
let rootProps = {};
createApp(rootComponent, rootProps)
.mount('#somewhere')
i'm new with vue.js. i have two different vue.js file
this is the first file:
<template>
<SecondFile />
</template>
<script>
import SecondFile from SecondFile.vue
export default {
name: 'FirstFile',
component : { SecondFile },
};
</script>
this first vue file contains a value with variable profile.status which bring the value (active / inactive ) and i wanna pass it to second vue file.
this is the second file:
<template>
<a-dropdown class="action-bar">
<a class="action-dropdown" href="#"> ACTION <a-icon type="down" /> </a>
<a-menu slot="overlay">
<a-menu-item>
EXPORT PDF
</a-menu-item>
<a-menu-item>
{{ profile.status }}
</a-menu-item>
<a-menu-item>
DELETE
</a-menu-item>
</a-menu>
</a-dropdown>
</template>
<script>
export default {
name: 'SecondFile',
};
</script>
the profile.status value does not appear in the second file. how can i pass the value of profile.status? anyone can help me??
There are few way to communicate between Vue components, one of them is using Props.
steps:
add props property in the second file:
export default {
name: 'SecondFile',
props: {
profile: Object
}
};
edit first file:
<template>
<SecondFile :profile="profile"/>
</template>
see:Passing Data to Child Components with Props