Updating Vue.js Component Data

Question

Updating Vue.js Component Data

I have set up a basic Example Component which is bound to a Vue Instance as shown below:

<template>
    <div class="container-fluid">
        <div class="row">
            <div class="col-md-8 col-md-offset-2">
                <div class="panel panel-default">
                    <div class="panel-heading">Example Component</div>

                    <div class="panel-body">
                        {{ msg }}
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
    export default {
        data : function(){
            return{
                msg : "Hello"
            }
        },
        mounted() {
            console.log('Component mounted.')
        }
    }
</script>

Here is my app.js file

/**
 * First we will load all of this project's JavaScript dependencies including
 * Vue and other libraries. This serves as a great kickoff point for developing
 * powerful web applications using Vue and Laravel.
 */

require('./bootstrap');

window.Vue = require('vue');

/**
 * Next, we will create a new Vue application instance and connect it to
 * the page. You can then start adding components to this application
 * or customize the JavaScript scaffolding to meet your specific requirements.
 */

Vue.component('example-component', require('./components/ExampleComponent.vue'));

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

This is my HTML

<!doctype html>
<html lang="{{ app()->getLocale() }}">
    <head>
        <meta charset="utf-8">
        <meta name="csrf-token" content="{{ csrf_token() }}">

        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">

        <title>Laravel</title>


    </head>
    <body>

        <div id="app">
            <example-component></example-component>
        </div>

        <script src="{{ asset('js/app.js') }}"></script>
    </body>
</html>

How can I change the value of msg now? There is no reference to that component anywhere. How should I proceed?

Can this be done?

var ex = Vue.component('example-component', require('./components/ExampleComponent.vue'));
ex.data = "new Value";

javascript vue.js vuejs2

Answer 1

Answer №1

Include a props property in your component and assign the msg property to it:

<script>
export default {
     props:{
         msg:{
            type:String,
            default:"Hello"
          }
       },
    data : function(){

    },
    mounted() {
        console.log('Component mounted.')
    }
  }
</script>

Then use it like this:

 <example-component msg="new Hello"></example-component>

UPDATE

If you need to access the child component directly, consider using child component ref

const ExampleComponent = Vue.component('example-component', {
  template: `
    <div>
      <h2>Example component</h2>
      <div>{{msg}}</div>
    </div>
  `,
  data() {
    return {
      msg: "Hello"
    }
  }
});

window.root = new Vue({
  el: '#app',
  components: {
    ExampleComponent
  }
});

root.$refs.example.msg = "new hello"

<!DOCTYPE html>
<html lang="en" dir="ltr">

<head>
  <meta charset="utf-8>
  <title></title>
  <script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c5b3b0a085f7ebf0ebf4f2">[email protected]</a>/dist/vue.js></script>

</head>

<body>

  <div id="app">
    <h2>Parent</h2>

    <example-component ref="example"></example-component>
  </div>
</body>

</html>

Answer 2

Include a props property in your component and assign the msg property to it:

<script>
export default {
     props:{
         msg:{
            type:String,
            default:"Hello"
          }
       },
    data : function(){

    },
    mounted() {
        console.log('Component mounted.')
    }
  }
</script>

Then use it like this:

 <example-component msg="new Hello"></example-component>

UPDATE

If you need to access the child component directly, consider using child component ref

const ExampleComponent = Vue.component('example-component', {
  template: `
    <div>
      <h2>Example component</h2>
      <div>{{msg}}</div>
    </div>
  `,
  data() {
    return {
      msg: "Hello"
    }
  }
});

window.root = new Vue({
  el: '#app',
  components: {
    ExampleComponent
  }
});

root.$refs.example.msg = "new hello"

<!DOCTYPE html>
<html lang="en" dir="ltr">

<head>
  <meta charset="utf-8>
  <title></title>
  <script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c5b3b0a085f7ebf0ebf4f2">[email protected]</a>/dist/vue.js></script>

</head>

<body>

  <div id="app">
    <h2>Parent</h2>

    <example-component ref="example"></example-component>
  </div>
</body>

</html>

Answer 3

Answer №2

TL;DR Check out this example, it does exactly what you need: https://codesandbox.io/s/88ojwpjq88

You must differentiate between the component's private `data` and the `props` (data passed to the child component). Refer to this section of the Vue.js guide: https://v2.vuejs.org/v2/guide/components.html

In your component, make sure to declare the prop:

export default {
    props : ['msg'],
    mounted() {
        console.log('Component mounted.')
    }
}

Then you can assign data to the child component like so:

<example-component :msg="myMessage"></example-component>

, assuming that the parent component has declared `myMessage` like this:

data : function(){
   return {
    myMessage : "Hello"
  }
}

To update the value, you can bind it to an input element. Here's an example with a text field:

<input v-model="myMessage">

.

If you type something into this field, you should see the bound value in your component update accordingly.

Please refer to the manual here: https://v2.vuejs.org/v2/guide/index.html. It provides comprehensive coverage for your questions.

Answer 4

TL;DR Check out this example, it does exactly what you need: https://codesandbox.io/s/88ojwpjq88

You must differentiate between the component's private `data` and the `props` (data passed to the child component). Refer to this section of the Vue.js guide: https://v2.vuejs.org/v2/guide/components.html

In your component, make sure to declare the prop:

export default {
    props : ['msg'],
    mounted() {
        console.log('Component mounted.')
    }
}

Then you can assign data to the child component like so:

<example-component :msg="myMessage"></example-component>

, assuming that the parent component has declared `myMessage` like this:

data : function(){
   return {
    myMessage : "Hello"
  }
}

To update the value, you can bind it to an input element. Here's an example with a text field:

<input v-model="myMessage">

.

If you type something into this field, you should see the bound value in your component update accordingly.

Please refer to the manual here: https://v2.vuejs.org/v2/guide/index.html. It provides comprehensive coverage for your questions.

Answer 5

Answer №3

To establish communication between parent and child components in Vue.js, you need to add a property to your component and bind it accordingly. Depending on the data flow direction - from parent to child or vice versa - you will either pass data through props or emit events. More information here

When passing data from parent to child:

<template>
  <div> {{msg}} </div>
</template>

<script>
export default {
 props: {
  msg: {
  type: String,
  default: 'Hello'
  }
 }
}
</script>

In the child component:

<template>
 <div>
  <parent :msg="valueMsg"/>
 </div>
</template>

And in the child component script:

<script>
import pai from './pai'
export default {components: {parent},
 data: () => ({
  valueMsg = 'Hello Test'
  })
}

Check out this example for reference

Answer 6

To establish communication between parent and child components in Vue.js, you need to add a property to your component and bind it accordingly. Depending on the data flow direction - from parent to child or vice versa - you will either pass data through props or emit events. More information here

When passing data from parent to child:

<template>
  <div> {{msg}} </div>
</template>

<script>
export default {
 props: {
  msg: {
  type: String,
  default: 'Hello'
  }
 }
}
</script>

In the child component:

<template>
 <div>
  <parent :msg="valueMsg"/>
 </div>
</template>

And in the child component script:

<script>
import pai from './pai'
export default {components: {parent},
 data: () => ({
  valueMsg = 'Hello Test'
  })
}

Check out this example for reference

Updating Vue.js Component Data

Answer №1

Answer №2

Answer №3

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