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how to v-model on different array vue 3

Hi I was trying to use a v-model an input to a value in object in an array of object in Vue 3. The complexity lies in the fact the object is first processed by a function. And that it need to be processed every time when a change is made to an input. Here is my code (and a sandbox link) :
<template>
<div id="app">
<div v-for="param in process(parameters)" :key="param">
Name : {{param.name}} Value : <input v-model="param.value">
</div>
{{parameters}}
</div>
</template>
<script>
export default {
name: "App",
data(){
return{
parameters :[
{'name':'Richard Stallman','value':'cool dude'},
{'name':'Linus Torvalds','value':'very cool dude'},
{'name':'Dennis Ritchie','value':'very very cool dude'}
]
}
},
methods:{
process(parameters){
const results = parameters.map( param =>{
return {name:param.name+' extra text',
value:param.value+' extra text',
}
})
return results
}
}
};
</script>
I just want the original parameters to change when something is types in the inputs. Maybe #change could be of use. But I didn't find a fix with #change. Does anyone know a solution to my problem? Thanks in advance.

Use computed property to get reactive state of the data.
Working Demo :
new Vue({
el: '#app',
data: {
parameters :[
{'name':'Richard Stallman','value':'cool dude'},
{'name':'Linus Torvalds','value':'very cool dude'},
{'name':'Dennis Ritchie','value':'very very cool dude'}
]
},
computed: {
process() {
const results = this.parameters.map((param) => {
return {
name: param.name + ' extra text',
value: param.value + ' extra text'
}
});
return results;
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div v-for="param in process" :key="param">
Name : {{param.name}}
Value : <input v-model="param.value">
</div><br>
<strong>Orinigal Data :</strong> {{parameters}}
</div>

I am not entirely sure I understood whether the person should be able to see/edit the text you added within you processing method.
Anyway, I think this sample of code should solve you problem :
<template>
<div id="app">
<div v-for="param in parameters" :key="param.name">
Name : {{ param.name }} Value : <input v-model="param.value" />
</div>
{{ process }}
</div>
</template>
<script>
export default {
name: "App",
data() {
return {
parameters: [
{ name: "Richard Stallman", value: "cool dude" },
{ name: "Linus Torvalds", value: "very cool dude" },
{ name: "Dennis Ritchie", value: "very very cool dude" },
],
};
},
computed: {
process: function() {
const results = this.parameters.map((param) => {
return {
name: param.name + " extra text",
value: param.value + " extra text",
};
});
return results;
},
},
};
</script>
So, we're iterating through the parameters array directly, adding an input on the value just like you did.
When you type in the input, you update the parameter linked to it, in live.
I just switched the method you made into a computed method.
This way, every time parameters is updated, "process" is also updated because it's depending on it directly.
I also removed passing the "parameters" argument, it's in the component data, you can just access it directly.
This way, using "process" just like any variable, you'll always have the updated parameters + what you added to em.

Vue.js return component value to vanilla javascript

I'm wondering if I am able to get a components data, the count property in this instance and console.log it into normal javascript, is this possible? I'm wanting to do console.log(btn.data.count) in this case
<div id="app" v-cloak>
<h1>{{greeting}}</h1>
<button-counter></button-counter>
</div>
<script src="https://unpkg.com/vue#next"></script>
<script>
let app = Vue.createApp({
data: function(){
return {
greeting: "hi"
}
}
})
let btn = app.component('button-counter', {
data: function () {
return {
count: 0
}
},
template: '<button v-on:click="count++">You clicked me {{ count }} times.</button>'
})
console.log(btn.data.count) // doesn't work
app.mount("#app")
</script>

There might be multiple instances of the button-counter component, so you cannot ask for the count.
You can only access the data from within the component itself. For example from within a method that handles the click event:
let btn = app.component('button-counter', {
data: function () {
return {
count: 0
}
},
methods: {
onClick() {
console.log(this.count)
this.count++
}
},
template: '<button v-on:click="onClick">You clicked me {{ count }} times.</button>'
})

You can use console.log normally you just need to use it where it makes sense. It does not make sense using it before #app is mounted.
Try writing a method for your count++ and add console log there you will see that it gets executed every time.

Why if I get the object property within the computed object gets undefined but not the object itself? Which approach fits better in this context?

My Greeting.
To put in context, my purpose of asking this question is to be able to render a child component inside a form based on the selected option of the <app-selector> Vue component as simple and silly as that.
For the sake of simplicity. I've made a snippet down here to expose what I'm trying to figure out.
Basically, the aim is to get the component name to be rendered by using the computed property cardTypeComponent. However, I want to fathom the way cardTypeComponent is working, since I cannot see why, in one hand, the first return (return this.form) is giving the object (this.form) with the property I want (card_type) but on the other hand the second return (return this.form.card_type ? this.form.card_type + 'Compose' : '') is giving me an empty string, assuming this.form.card_type is undefined when it is clear looking at the first return that, in fact, is not taking it as undefined.
There is way more context, since once the option is selected there is a validation process from the server before setting the value inside this.form object. Moreover, the form interaction is through steps, so once the user select the option he has to click a button to reach the form fields that corresponds to that type card selected, therefore the component is not going to be rendered the very first moment the user selects an option as in the snippet approach. However, it would entangle what I'm asking. Thanks beforehand.
It is better to use the Fiddle link below.
Snippet
var appSelector = Vue.component('app-selector', {
name: 'AppSelector',
template: `<div>
<label for="card_type">Card Type:</label>
<select :name="name" value="" #change="sendSelectedValue">
<option v-for="option in options" :value="option.value">
{{ option.name }}
</option>
</select>
</div>`,
props: {
name: {
required: false,
type: String,
},
options: {
required: false,
type: Array,
}
},
methods: {
sendSelectedValue: function(ev) {
this.$emit('selected', ev.target.value, this.name)
}
}
});
var guessByImageCompose = Vue.component({
name: 'GuessByImageComponse',
template: `<p>Guess By Image Compose Form</p>`
});
var guessByQuoteCompose = Vue.component({
name: 'GuessByQuoteComponse',
template: `<p>Guess By Quote Compose Form</p>`
});
new Vue({
el: '#app',
components: {
appSelector: appSelector,
guessByImageCompose: guessByImageCompose,
guessByQuoteCompose: guessByQuoteCompose,
},
data() {
return {
form: {},
card_types: [
{
name: 'Guess By Quote',
value: 'GuessByQuote'
},
{
name: 'Guess By Image',
value: 'GuessByImage'
}
],
}
},
computed: {
cardTypeComponent: function() {
return this.form; // return { card_type: "GuessByImage" || "GuessByQuote" }
return this.form.card_type ? this.form.card_type + 'Compose' : ''; // return empty string ("") Why?
}
},
methods: {
setCardType: function(selectedValue, field) {
this.form[field] = selectedValue;
console.log(this.form.card_type); // GuessByImage || GuessByQuote
console.log(this.cardTypeComponent); // empty string ("") Why?
}
},
mounted() {
console.log(this.cardTypeComponent); // empty string ("")
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<form action="#" method="post">
<app-selector
:name="'card_type'"
:options="card_types"
#selected="setCardType"
>
</app-selector>
{{ cardTypeComponent }} <!-- Always empty string !-->
<component v-if="cardTypeComponent !== ''" :is="cardTypeComponent">
</component>
</form>
</div>
https://jsfiddle.net/k7gnouty/2/

You're setting a property on this.form which is not initialized first in data. This means you have run into Vue's change detection caveat. Use Vue.set when setting it:
methods: {
setCardType: function(selectedValue, field) {
Vue.set(this.form, field, selectedValue);
}
}
Alternatively, you could declare the properties first if that works better for you.

Can't access sub-object in Vue JS 3

I'm pretty new in VueJS and am stuck on the following problem:
I have a template in which a click on a button loads a new template through router.push and also sends an ID as data along.
The template:
<template>
<div>
{{ content.description }} // Works fine
{{ content.subobject.logo }} // Logo not found
</div>
</template>
In the new template that is being loaded I have the following function for saving the received ID into data:
created: function() {
this.ID = this.$route.params.data.toString()
},
then I have a function in methods which uses this ID to get data via axios/get:
methods: {
getContent: function() {
axios.get("https://api-url.com/" + this.ID)
.then((response) => {
this.content = response.data.data
console.log(response);
}).catch(error => {
console.log("ERRR:: ", error.response.data)
});
}
},
this function is called in mounted:
mounted: function() {
this.getContent()
}
My data function:
data: function() {
return {
ID: '',
content: [] as any
}
The data that is being returned by the API looks something like this:
title: "this is the title"
description: "Lorem Ipsum"
subobject: {
logo: "Logo URL"
}
When i use {{ content.title }} or {{ content.description }} in my template it shows up fine. As soon as I use {{ content.subobject.logo }} I'll get an error "logo" not found.
The funny thing is, when I have the template opend up and add the {{ content.subobject.logo }} after the page has loaded, save it, and it hot-reloads, it shows up fine?!
It seems like the data is not "available" on first load - but how can that be, if {{ content.title }} works fine?
Thanks a lot for any ideas!

The data is initially not available which means that content is still without inner field values, in order to avoid that add a conditional rendering like :
<div v-if="content.subobject">{{ content.subobject.logo }}</div>
you could also do :
data: function() {
return {
ID: '',
content: null
}
}
<template>
<template v-if="content">
<div >{{ content.subobject.logo }}</div>
<div >{{ content.title }}</div>
</template>
</template>

Vuejs not updating list but updating obect

I am learning Vuejs and I am stuck. Why can I see the messages get added to the object (in Chrome Vue debugger) yet it is not added to the div that contains the list?
My Vue Component:
<template>
<div id="round-status-message" class="round-status-message">
<div class="row">
<div class="col-xs-12" v-for="sysmessage in sysmessages" v-html="sysmessage.message"></div>
</div>
</div>
</template>
<script>
export default {
props: ['sysmessages'],
methods: {
scrollToTop () {
this.$el.scrollTop = 0
}
}
};
</script>
My Vue instance:
$(document).ready(function()
{
Vue.component('chat-system', require('../components/chat-system.vue'));
var chatSystem = new Vue({
el: '#system-chat',
data: function () {
return {
sysmessages: []
};
},
created() {
this.fetchMessages();
Echo.private(sys_channel)
.listen('SystemMessageSent', (e) => {
this.sysmessages.unshift({
sysmessage: e.message.message,
});
this.processMessage(e);
});
},
methods: {
fetchMessages() {
axios.get(sys_get_route)
.then(response => {
this.sysmessages = response.data;
});
},
processMessage(message) {
this.$nextTick(() => {
this.$refs.sysmessages.scrollToTop();
});
// updateGame();
}
}
});
});
My template call in HTML:
<div id="system-chat">
<chat-system ref="sysmessages" v-on:systemmessagesent="processMessage" :sysmessages="sysmessages" :player="{{ Auth::user() }}"></chat-system>
</div>
There are no compile or run time errors and I can see records added to the props in the vue chrome tool. I can also see empty HTML elements added to the div.
What have I missed?
UPDATE: My record structures:
response.data is an array of objects, each like this:
{"data":[
{"id":100,
"progress_id":5,
"message":"start message",
"action":"welcome"
},
{"id"....
e.message.message contains the text message entry, so just a string.
I am trying to access the message variable in each object during the fetchMessages method.

You're adding objects with sysmessage as the property.
this.sysmessages.unshift({
sysmessage: e.message.message,
});
But you are trying to view
v-for="sysmessage in sysmessages" v-html="sysmessage.message"
Based on your update, the code should be:
this.sysmessages.unshift({
message: e.message.message,
});
And you can leave the template as
v-html="sysmessage.message"