Element in Vue.js not recognized

Question

Element in Vue.js not recognized

Recently, I decided to dive into Vue.js as a beginner and started working on an app to manage my daily tasks. However, I encountered Vue Components along the way and ran into an error that has me puzzled:

vue.js:1023 [Vue warn]: Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the "name" option.

If anyone has any insights or tips, please share them with me!

new Vue({
  el : '#app',
  data : {
    tasks : [
      { name : "task 1", completed : false},
      { name : "task 2", completed : false},
      { name : "task 3", completed : true}
    ]
  },
  methods : {
  
  },
  computed : {
  
  },
  ready : function(){

  }

});

Vue.component('my-task',{
  template : '#task-template',
  data : function(){
    return this.tasks
  },
  props : ['task']
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/1.0.26/vue.js"></script>
<div id="app">
  <div v-for="task in tasks">
      <my-task :task="task"></my-task>
  </div>
  
</div>

<template id="task-template">
  <h1>My tasks</h1>
  <div class="">{{ task.name }}</div>
</template>

javascript vue.js

Answer 1

Answer №1

It appears that you overlooked the components section in your Vue initialization. Therefore, Vue is unaware of your component's existence.

Make the following adjustments:

var myTask = Vue.component('my-task', {
 template: '#task-template',
 data: function() {
  return this.tasks; //Note: components' data should return an object. For instance, "return { someProp: 1 }"
 },
 props: ['task']
});

new Vue({
 el: '#app',
 data: {
  tasks: [{
    name: "task 1",
    completed: false
   },
   {
    name: "task 2",
    completed: false
   },
   {
    name: "task 3",
    completed: true
   }
  ]
 },
 components: {
  myTask: myTask
 },
 methods: {

 },
 computed: {

 },
 ready: function() {

 }

});

You can also view a working example on jsBin here: http://jsbin.com/lahawepube/edit?html,js,output

UPDATE

There are situations where you may need your components to be globally accessible by other components.

In such cases, you must register your components as follows, prior to your Vue initialization or export (if registering from another component):

Vue.component('exampleComponent', require('./components/ExampleComponent.vue')); //Ensure component name is camel-case

Then, you can include your component within your vue el:

<example-component></example-component>

Answer 2

It appears that you overlooked the components section in your Vue initialization. Therefore, Vue is unaware of your component's existence.

Make the following adjustments:

var myTask = Vue.component('my-task', {
 template: '#task-template',
 data: function() {
  return this.tasks; //Note: components' data should return an object. For instance, "return { someProp: 1 }"
 },
 props: ['task']
});

new Vue({
 el: '#app',
 data: {
  tasks: [{
    name: "task 1",
    completed: false
   },
   {
    name: "task 2",
    completed: false
   },
   {
    name: "task 3",
    completed: true
   }
  ]
 },
 components: {
  myTask: myTask
 },
 methods: {

 },
 computed: {

 },
 ready: function() {

 }

});

You can also view a working example on jsBin here: http://jsbin.com/lahawepube/edit?html,js,output

UPDATE

There are situations where you may need your components to be globally accessible by other components.

In such cases, you must register your components as follows, prior to your Vue initialization or export (if registering from another component):

Vue.component('exampleComponent', require('./components/ExampleComponent.vue')); //Ensure component name is camel-case

Then, you can include your component within your vue el:

<example-component></example-component>

Answer 3

Answer №2

Make sure to declare Vue.component() before initializing new Vue().

Vue.component('my-task',{
     .......
});

new Vue({
    .......
});

Important Update

HTML automatically changes <anyTag> to <anytag>
Avoid using uppercase letters in component names
Instead of <myTag>, use <my-tag>

Github issue : https://github.com/vuejs/vue/issues/2308

Answer 4

Make sure to declare Vue.component() before initializing new Vue().

Vue.component('my-task',{
     .......
});

new Vue({
    .......
});

Important Update

HTML automatically changes <anyTag> to <anytag>
Avoid using uppercase letters in component names
Instead of <myTag>, use <my-tag>

Github issue : https://github.com/vuejs/vue/issues/2308

Answer 5

Answer №3

After dedicating an hour to unraveling this issue, I finally found the solution.

The culprit turned out to be a simple oversight on my part - forgetting to close the <script> tag in the parent component.

It's frustrating that neither the browser console nor my code editor provided any clues to point me in the right direction.

Answer 6

After dedicating an hour to unraveling this issue, I finally found the solution.

The culprit turned out to be a simple oversight on my part - forgetting to close the <script> tag in the parent component.

It's frustrating that neither the browser console nor my code editor provided any clues to point me in the right direction.

Answer 7

Answer №4

Vue has been known to have some issues in this area. In my experience, while declaring a component like this

components: { MyComponent }

tends to be effective most of the time and allows for both MyComponent or my-component usage automatically, there are occasions where you need to specify it explicitly like so

components: { 'my-component' : MyComponent }

And then strictly use it as my-component

Answer 8

Vue has been known to have some issues in this area. In my experience, while declaring a component like this

components: { MyComponent }

tends to be effective most of the time and allows for both MyComponent or my-component usage automatically, there are occasions where you need to specify it explicitly like so

components: { 'my-component' : MyComponent }

And then strictly use it as my-component

Answer 9

Answer №5

My issue was resolved by making a simple modification to my code.

I changed the line from

import {component} from "@/path/to/component.vue"

to

import component from "@/path/to/component.vue"

and that fixed everything for me.

Answer 10

My issue was resolved by making a simple modification to my code.

I changed the line from

import {component} from "@/path/to/component.vue"

to

import component from "@/path/to/component.vue"

and that fixed everything for me.

Answer 11

Answer №6

Avoid excessive use of Vue.component() as it registers components globally. Instead, consider creating a new file named MyTask.vue where you export the Vue object. You can find more information on this approach at this link. Once you have created the file, import it into your main file and remember to register it with the following code:

new Vue({
...
components: { myTask }
...
})

Answer 12

Avoid excessive use of Vue.component() as it registers components globally. Instead, consider creating a new file named MyTask.vue where you export the Vue object. You can find more information on this approach at this link. Once you have created the file, import it into your main file and remember to register it with the following code:

new Vue({
...
components: { myTask }
...
})

Answer 13

Answer №7

After some research, I found the solution that worked for me: I passed in a third argument as an object.

In my app.js file (while using Laravel and Webpack):

Vue.component('news-item', require('./components/NewsItem.vue'), {
    name: 'news-item'
});

Answer 14

After some research, I found the solution that worked for me: I passed in a third argument as an object.

In my app.js file (while using Laravel and Webpack):

Vue.component('news-item', require('./components/NewsItem.vue'), {
    name: 'news-item'
});

Answer 15

Answer №8

While searching for a solution one day, I came across an error that seemed so obvious yet was causing me immense frustration. It turned out that I had accidentally declared the same component twice in my VueJS code. Despite being a simple mistake, it went unnoticed because VueJS did not throw any errors when this happened. The issue arose from having a large chunk of code in between the duplicate declarations. When adding a new component, I inadvertently placed its declaration at the top without realizing there was already one at the bottom. This experience taught me to always check for duplicated components first in order to save time and avoid unnecessary headaches.

Answer 16

While searching for a solution one day, I came across an error that seemed so obvious yet was causing me immense frustration. It turned out that I had accidentally declared the same component twice in my VueJS code. Despite being a simple mistake, it went unnoticed because VueJS did not throw any errors when this happened. The issue arose from having a large chunk of code in between the duplicate declarations. When adding a new component, I inadvertently placed its declaration at the top without realizing there was already one at the bottom. This experience taught me to always check for duplicated components first in order to save time and avoid unnecessary headaches.

Answer 17

Answer №9

Ensure that the component has been properly included in the components section.

Here is an example:

export default {
data() {
    return {}
},
components: {
    'lead-status-modal': LeadStatusModal,
},
}

Answer 18

Ensure that the component has been properly included in the components section.

Here is an example:

export default {
data() {
    return {}
},
components: {
    'lead-status-modal': LeadStatusModal,
},
}

Answer 19

Answer №10

A fantastic approach to constructing a Vue component.

let template = `<ul>
  <li>Insert your content here</li>
</ul>`;

Vue.component('my-component', {
  template: template,
  data() {

  },
  props: {
    content: {
      type: String
    }
  },
  methods: {

  },
  computed: {

  },
  ready() {

  }
});

new Vue({
 el : '#app'
});

Answer 20

A fantastic approach to constructing a Vue component.

let template = `<ul>
  <li>Insert your content here</li>
</ul>`;

Vue.component('my-component', {
  template: template,
  data() {

  },
  props: {
    content: {
      type: String
    }
  },
  methods: {

  },
  computed: {

  },
  ready() {

  }
});

new Vue({
 el : '#app'
});

Answer 21

Answer №11

While studying the Vue documentation on https://v2.vuejs.org/v2/guide/index.html, I encountered a stumbling block.

They later explain the syntax as follows:

Up to this point, we have only been registering components globally using Vue.component:
   Vue.component('my-component-name', {
       // ... options ...
   })
Globally registered components can be used in the template of any root Vue instance (new Vue) created afterwards – and even inside all >subcomponents of that Vue instance’s component tree.

(https://v2.vuejs.org/v2/guide/components.html#Organizing-Components)

As mentioned by Umesh Kadam above, ensure that the global component definition is placed before the var app = new Vue({}) instantiation.

Answer 22

While studying the Vue documentation on https://v2.vuejs.org/v2/guide/index.html, I encountered a stumbling block.

They later explain the syntax as follows:

Up to this point, we have only been registering components globally using Vue.component:
   Vue.component('my-component-name', {
       // ... options ...
   })
Globally registered components can be used in the template of any root Vue instance (new Vue) created afterwards – and even inside all >subcomponents of that Vue instance’s component tree.

(https://v2.vuejs.org/v2/guide/components.html#Organizing-Components)

As mentioned by Umesh Kadam above, ensure that the global component definition is placed before the var app = new Vue({}) instantiation.

Element in Vue.js not recognized

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

Answer №10

Answer №11

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