I am making a component InputText.vue as follows:
<template>
<div class="row">
<div class="col-sm-12">
<div class="form-group">
<h4>Edit Text:</h4>
<textarea class="form-control" cols="50" rows="4" placeholder="Enter text here..." v-model="textBoxInput" #keyup="textChanged"></textarea>
</div>
</div>
</div>
</template>
<script>
export default{
data: function(){
return {
textBoxInput: ""
}
},
methods: {
textChanged: function(){
this.$emit('displayTextChanged', this.textBoxInput);
}
}
}
</script>
Then I am registering and using it in CardFront.vue component as follows:
<style>
.edit-area {
padding: 20px;
height: 800px;
background-color: #d2f9f9;
}
.card-display {
padding: 20px;
height: 800px;
}
</style>
<template>
<div class="row">
<div class="card col-sm-6 edit-area">
<cc-text-area></cc-text-area>
</div>
<div class="card col-sm-6 card-display">
</div>
</div>
</template>
<script>
import TextInput from './TextInput.vue'
export default{
components: {
ccTextArea: TextInput
}
}
<script>
It gives this error:
Error
Please help me out. I am using Vue version 2. Whenever I try to refresh the page, it gives error like: [Vue warn]: Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the "name" option.
I am making a component InputText.vue as follows:
Check that the filename and component names match.
If you import TextInput from './TextInput.vue' in the using component, then also make sure you name your component that, and optionally add a name property as suggested in the comments.
// TextInput.vue (not InputText.vue)
export default {
name: 'TextInput',
...
}
I solved the issue. Thank you so much everyone for your help. The issue lied in the closing script tag in CardFront.vue component.
I am quite new in vue so I haven't understood the logic completely. My question is I have ticket and ticketlist components. So I am not on my ticket list component I am creating some tickets data and I want to show them according to the ticket component. To make it more clear here is my ticketlist component:
<template>
<section class="tickets">
<div class="container">
<div class="row">
<div class="col-12 col-md-3 mb-3">
<Ticket v-for="ticket in tickets" :key="ticket.id" :product="ticket"/>
</div>
</div>
</div>
</section>
</template>
<script>
import Ticket from './Ticket'
export default {
components: {
Ticket
},
data() {
return {
tickets: [
{
id: 0,
category: "Einzelkarte",
price: "€3,50",
tariff: [
"Wählen Sie eine Option",
"Erwachsene",
"Erwachsener erm.",
"Kinder / Jugendliche",
"Kinder / Jugendliche erm.",
],
available_amount: 23,
article_number: "2021.05.04-2673990197-1",
},
],
};
},
}
</script>
And also ticket component:
<template>
<widget type="ticket" class="--flex-column">
<div class="top --flex-column">
<div class="bandname -bold">Ghost Mice</div>
<div class="tourname">Home Tour</div>
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/199011/concert.png" alt="" />
<div class="deetz --flex-row-j!sb">
<div class="event --flex-column">
<div class="date">3rd March 2017</div>
<div class="location -bold">Bloomington, Indiana</div>
</div>
<div class="price --flex-column">
<div class="label">Price</div>
<div class="cost -bold">€{{ ticket.price }}</div>
</div>
</div>
</div>
<div class="rip"></div>
<div class="bottom --flex-row-j!sb">
<a class="btn button" href="#">ADD TO CART</a>
</div>
</widget>
</template>
<script>
export default {
props: ['ticket'],
}
</script>
<style scoped>
#import 'https://i.koya.io/flex/1.1.0.css';
*, ::after, ::before {
box-sizing: unset;
}
</style>
So, I am showing TicketList component in one of the page but the thing is it doesnt show anything. So I wonder how can I connect them together and show tickets data according to ticket component. I hope I am clear but if I am not I can answer you in the comments.
The probleme is the props name, you need to pass ticket as props and not product
...
<Ticket v-for="ticket in tickets" :key="ticket.id" :ticket="ticket"/>
...
or the contrary inside you Ticket component set :
props: ['product']
so on this project i was trying to make an image component to display an image from a string props.
here is my component code
this is the component
<template>
<div class="Img-grid">
<div class="container">
<div class="col">
<img :v-bind:src="recipeImage" alt="image-photo">
<p>{{recipeName}}</p>
</div>
</div>
</div>
</template>
<script>
export default {
name: 'ImgGrd'
props: {
recipeImage: String,
recipeName: String
}
}
</script>
this is my where the component display
<template>
<div class="RecipeByYou">
<div class="container">
<ImgGrid recipeName="a" v-bind:recipeImage="imgUrl" />
</div>
</div>
</template>
<script>
import ImgGrid from '../components/Image_Grid.vue'
export default {
name: 'RecipeImage',
components: {
Header,
ImgGrid
},
data () {
return {
imgUrl: 'https://media.sproutsocial.com/uploads/2017/02/10x-featured-social-media-image-size.png'
}
}
}
am i doing anything wrong? because when i inspect the web element it shows this thing, so i was confuse where did i do wrong, is this the correct method?
<img data-v-366ed4fa="" v-bind:src="https://media.sproutsocial.com/uploads/2017/02/10x-featured-social-media-image-size.png" alt="image-photo">
change this code <img :v-bind:src="recipeImage" alt="image-photo"> to <img v-bind:src="recipeImage" alt="image-photo">.
or you can change <img :v-bind:src="recipeImage" alt="image-photo"> to <img :src="recipeImage" alt="image-photo">.
: is shorthand of v-bind, your code :v-bind:src="recipeImage" means v-bind:v-bind:src="recipeImage"
Is there a way to only display a slot if it has any content?
For example, I'm building a simple Card.vue component, and I only want the footer displayed if the footer slot has content:
Template
<template>
<div class="panel" :class="panelType">
<div class="panel-heading">
<h3 class="panel-title">
<slot name="title">
Default Title
</slot>
</h3>
</div>
<div class="panel-body">
<slot name="body"></slot>
<p class="category">
<slot name="category"></slot>
</p>
</div>
<div class="panel-footer" v-if="hasFooterSlot">
<slot name="footer"></slot>
</div>
</div>
</template>
Script
<script>
export default {
props: {
active: true,
type: {
type: String,
default: 'default',
},
},
computed: {
panelType() {
return `panel-${this.type}`;
},
hasFooterSlot() {
return this.$slots['footer']
}
}
}
</script>
In in View:
<card type="success"></card>
Since the above component doesn't contain a footer, it should not be rendered, but it is.
I've tried using this.$slots['footer'], but this returns undefined.
Does anyone have any tips?
It should be available at
this.$slots.footer
So, this should work.
hasFooterSlot() {
return !!this.$slots.footer;
}
Example.
You should check vm.$slots and also vm.$scopedSlots for it.
hasSlot (name = 'default') {
return !!this.$slots[ name ] || !!this.$scopedSlots[ name ];
}
CSS simplifies this a lot. Just use the following code and voila!
.panel-footer:empty {
display: none;
}
This is the solution for Vue 3 composition API:
<template>
<div class="md:grid md:grid-cols-5 md:gap-6">
<!-- Here, you hide the wrapper if there is no used slot or empty -->
<div class="md:col-span-2" v-if="hasTitle">
<slot name="title"></slot>
</div>
<div class="mt-5 md:mt-0"
:class="{'md:col-span-3': hasTitle, 'md:col-span-5': !hasTitle}">
<div class="bg-white rounded-md shadow">
<div class="py-7">
<slot></slot>
</div>
</div>
</div>
</div>
</template>
<script>
import {ref} from "vue";
export default {
setup(props, {slots}) {
const hasTitle = ref(false)
// Check if the slot exists by name and has content.
// It returns an empty array if it's empty.
if (slots.title && slots.title().length) {
hasTitle.value = true
}
return {
hasTitle
}
}
}
</script>
Now, in Vue3 composition API , you can use useSlots.
<script setup>
import { useSlots } from 'vue'
const slots = useSlots()
</script>
<template>
<div v-if="slots.content" class="classname">
<slot name="content"></slot>
</div>
</template>
In short do this in inline:
<template lang="pug">
div
h2(v-if="$slots.title")
slot(name="title")
h3(v-if="$slots['sub-title']")
slot(name="sub-title")
</template>
I have ran into a similiar issue but across a wide code base and when creating atomic design structured components it can be tiring writing hasSlot() methods all the time and when it comes to TDD - its one more method to test... Saying that, you can always put the raw logic in a v-if but i have found that the template end up cluttered and harder to read on occasions especially for a new dev checking out the code structure.
I was tasked to find out a way of removing parent divs of slots when the slot isnt provided.
Issue:
<template>
<div>
<div class="hello">
<slot name="foo" />
</div>
<div class="world">
<slot name="bar" />
</div>
</div>
</template>
//instantiation
<my-component>
<span slot="foo">show me</span>
</my-component>
//renders
<div>
<div class="hello">
<span slot="foo">show me</span>
</div>
<div class="world"></div>
</div>
as you can see, the issue is that i have an almost 'trailing' div, that could provide styling issues when the component author decides there is no need for a bar slot.
ofcourse we could go <div v-if="$slots.bar">...</div> or <div v-if="hasBar()">...</div> etc but like i said - that can get tiresome and eventually end up harder to read.
Solution
My solution was to make a generic slot component that just rendered out a slot with a surrounding div...see below.
//slot component
<template>
<div v-if="!!$slots.default">
<slot />
</div>
</template>
//usage within <my-component/>
<template>
<div>
<slot-component class="hello">
<slot name="foo"/>
</slot-component>
<slot-component class="world">
<slot name="bar"/>
</slot-component>
</div>
</template>
//instantiation
<my-component>
<span slot="foo">show me</span>
</my-component>
//renders
<div>
<div class="hello">
<span>show me</span>
</div>
</div>
I came into use-case issues when trying this idea and sometimes it was my markup structure that needed to change for the benefit of this approach.
This approach reduces the need for small slot checks within each component template. i suppose you could see the component as a <conditional-div /> component...
It is also worth noting that applying attributes to the slot-component instantiation (<slot-component class="myClass" data-random="randomshjhsa" />) is fine as the attributes trickle into the containing div of the slot-component template.
Hope this helps.
UPDATE
I wrote a plugin for this so the need for importing the custom-slot component in each consumer component is not needed anymore and you will only have to write Vue.use(SlotPlugin) in your main.js instantiation. (see below)
const SLOT_COMPONENT = {
name: 'custom-slot',
template: `
<div v-if="$slots.default">
<slot />
</div>
`
}
const SLOT_PLUGIN = {
install (Vue) {
Vue.component(SLOT_COMPONENT.name, SLOT_COMPONENT)
}
}
export default SLOT_PLUGIN
//main.js
import SlotPlugin from 'path/to/plugin'
Vue.use(SlotPlugin)
//...rest of code
Initially I thought https://stackoverflow.com/a/50096300/752916 was working, but I had to expand on it a bit since $scopeSlots returns a function which is always truthy regardless of its return value. This is my solution, though I've come to the conclusion that the real answer to this question is "doing this is an antipattern and you should avoid it if possible". E.g. just make a separate footer component that could be slotted in.
Hacky solution
hasFooterSlot() {
const ss = this.$scopedSlots;
const footerNodes = ss && ss.footer && ss.footer();
return footerNodes && footerNodes.length;
}
Best Practice (helper component for footer)
const panelComponent = {
template: `
<div class="nice-panel">
<div class="nice-panel-content">
<!-- Slot for main content -->
<slot />
</div>
<!-- Slot for optional footer -->
<slot name="footer"></slot>
</div>
`
}
const footerComponent = {
template: `
<div class="nice-panel-footer">
<slot />
</div>
`
}
var app = new Vue({
el: '#app',
components: {
panelComponent,
footerComponent
},
data() {
return {
name: 'Vue'
}
}
})
.nice-panel {
max-width: 200px;
border: 1px solid lightgray;
}
.nice-panel-content {
padding: 30px;
}
.nice-panel-footer {
background-color: lightgray;
padding: 5px 30px;
text-align: center;
}
<script src="https://unpkg.com/vue#2.6.11/dist/vue.min.js"></script>
<div id="app">
<h1>Panel with footer</h1>
<panel-component>
lorem ipsum
<template #footer>
<footer-component> Some Footer Content</footer-component>
</template>
</panel-component>
<h1>Panel without footer</h1>
<panel-component>
lorem ipsum
</panel-component>
</div>
Hope I understand this right. Why not using a <template> tag, which is not rendered, if the slot is empty.
<slot name="foo"></slot>
Use it like this:
<template slot="foo">
...
</template>
For Vue 3:
Create an utility function
//utils.js
function isSlotHasContent(slotName, slots) {
return Boolean(!!slots[slotName] && slots[slotName]()[0].children.length > 0);
}
In your component:
<script setup>
import { isSlotHasContent } from 'path/to/utils.js';
const slots = useSlots();
// "computed" props has a better performance
const isFooSlotHasContent = computed(() => isSlotHasContent('foo', slots));
</script>
<template>
<div>
<div v-if="isFooSlotHasContent">
<slot name="foo" />
</div>
<div v-if="!isFooSlotHasContent">
Some placeholder
</div>
</div>
</template>
TESTED
So this work for me in vue 3:
I use onMounted to first get the value, and then onUpdate so the value can update.
<template>
<div v-if="content" class="w-1/2">
<slot name="content"></slot>
</div>
</template>
<script>
import { ref, onMounted, defineComponent, onUpdated } from "vue";
export default defineComponent({
setup(props, { slots }) {
const content = ref()
onMounted(() => {
if (slots.content && slots.content().length) {
content.value = true
}
})
onUpdated(() => {
content.value = slots.content().length
console.log('CHECK VALUE', content.value)
})
})
</script>
#Bert answer does not seem to work for dynamic templates like <template v-slot:foo="{data}"> ... </template>.
i ended up using:
return (
Boolean(this.$slots.foo) ||
Boolean(typeof this.$scopedSlots.foo == 'function')
);
I like the Solution of #AlexMA however in my case I needed to pass props to the function in order to get the nodes to show up.
Here is an example of how I am passing the "row" to the scoped slot, in my case the row contains a type param that I want to test against in the calling component.
<other-component>
<template v-slot:expand="{ row }" v-if="!survey.editable">
<div v-if="row.type != 1" class="flex">
{{ row }}
</div>
</template>
</other-component>
In "other-component" I have the template defined as
<template>
<div>
<div v-for="(row, index) in rows">
{{ hasSlotContent(row) }}
<slot name="expand" :row="row"> </slot>
</div>
</div>
</template>
Because the v-slot requires "row" to be passed to it I created a a method
methods:{
hasSlotContent(row){
const ss = this.$scopedSlots
const nodes = ss && ss.expand && ss.expand({ row: row })
return !!(nodes && nodes.length)
}
}
I call this on each iteration so that it can evaluate itself and give back the appropriate response.
you can use the "hasSlotContent(row)" method where-ever you need it, in my example I'm just outputting the truthy value to the DOM.
I hope this helps someone come to a quicker solution.
Reposting a Vue 3 solution from Github, which also works with Options API, since there was a fairly upvoted method from an Issue there:
The comment itself: https://github.com/vuejs/core/issues/4733#issuecomment-1024816095
The function (remove types if you're not writing TypeScript):
import {
Comment,
Text,
Slot,
VNode,
} from 'vue';
export function hasSlotContent(slot: Slot|undefined, slotProps = {}): boolean {
if (!slot) return false;
return slot(slotProps).some((vnode: VNode) => {
if (vnode.type === Comment) return false;
if (Array.isArray(vnode.children) && !vnode.children.length) return false;
return (
vnode.type !== Text
|| (typeof vnode.children === 'string' && vnode.children.trim() !== '')
);
});
}
This works just as fine, if you delete the slotProps argument (unless you need it).
VueJS component doesn't get cached or atleast reattached after navigation. On refresh or launch everything gets attached and rendered well but after navigating to another page then back. The First Component - Carousel - component in my case doesn't get rendered but the API call is made.
<template>
<div class="rel">
<div id="homeCarousel" class="owl-carousel owl-slider">
<div class="item" v-for="product in featured">
<div class="bg-holder top-area-half" >
<div class="bg-mask-lighten"></div>
<img class="bg-img" v-bind:src="product.feature_image_url">
<div class="hero-caption">
<div class="container">
<h3 class="hero-title">{{product.feature_title}}</h3>
<p class="hero-subtitle">{{product.feature_subtitle}}</p>
<a class="btn btn-white btn-ghost btn-lg hero-btn" href="#">Shop now</a>
</div>
</div>
</div>
</div>
</div>
<div id="hero-slider-nav" class="hero-slider-nav">
<div class="container">
<div class="pull-right"></div>
</div>
</div>
</div>
</template>
<style>
</style>
<script>
export default{
data(){
return{
featured:[]
}
},
ready(){
},
mounted(){
this.getFeaturedProducts();
},
components:{
},
methods: {
getFeaturedProducts: function () {
Vue.http.get('/api/product/filter/featured=1').then(
(response) => {
this.featured = response.body;
}
)
}
}
}
</script>
`
<template>
<div class="global-wrapper clearfix ">
<keep-alive>
<Carousel></Carousel>
</keep-alive>
//The rest of the code which is just importing the Component
I found out what i was doing wrong. I had a separate JS/JQuery file and on the document ready i was initializing an owl carousel by id #('homeCarousel').owlCarousel({}) . What worked was, since i had already bootstrapped owl carousel -> on the mounted lifecycle callback i was now targeting the element and making it an owl carousel.