Is it possible for a prop to change dynamically?

Question

Is it possible for a prop to change dynamically?

I am currently developing a component that is responsible for receiving data through a prop, making modifications to that data, and then emitting it back to the parent (as well as watching for changes).

Is it possible for a prop to be reactive? If not, what is the alternative method for assigning a prop to a reactive property?

I attempted to address this issue by:

defining props: ["receiveddata"]
creating a reactive property within data (for example, hello: '')
setting this.hello = this.receiveddata in the mounted() lifecycle hook

My expectation was that at this stage, this.hello would contain the content passed via the receiveddata prop, allowing me to work on this.hello thereafter (modifying it, monitoring it, and emitting it when necessary)

However, upon inspecting the values using DevTools, I observed that

this.hello was undefined
this.receiveddata correctly stored the initially provided data

It seems that during the mounted() phase, the prop values are not yet available (explaining the initial undefined value of

this.receiveddata</code), which is then assigned to <code>this.hello

, only to be populated later when this.receiveddata is updated.

In essence, my assignment of this.hello = this.receiveddata was incorrectly placed. However, finding the correct placement remains a challenge (I have even experimented with switching from mounted() to created())

javascript vue.js vue-component

Answer 1

Answer №1

It seems like you're looking for a way to handle this situation, and one approach I usually take is using a computed property with a getter and setter.

props: {
  someProp: String,
},
computed: {
  somePropLocal: {
    get () {
      return this.someProp
    },
    set (value) {
      this.$emit('input', value)
    },
  },
}

By setting it up this way, you can manipulate the value freely while ensuring that the correct value will be emitted.

this.somePropLocal = 'Whatever'

Additionally, if the parent directly modifies somePropLocal, it will be automatically updated as well.

Answer 2

It seems like you're looking for a way to handle this situation, and one approach I usually take is using a computed property with a getter and setter.

props: {
  someProp: String,
},
computed: {
  somePropLocal: {
    get () {
      return this.someProp
    },
    set (value) {
      this.$emit('input', value)
    },
  },
}

By setting it up this way, you can manipulate the value freely while ensuring that the correct value will be emitted.

this.somePropLocal = 'Whatever'

Additionally, if the parent directly modifies somePropLocal, it will be automatically updated as well.

Is it possible for a prop to change dynamically?

Answer №1

Similar questions

Require an additional button to dynamically load more content and shift all existing elements further down the page

Ways to change the value of a property in reverse

Utilizing negative values in lineTo, strokeRect, and fillRect functions

Guide on how to compile template strings during the build process with Babel, without using Webpack

"Jquery with 3 buttons for toggling on and off individually, as well

What is the process for executing Express's scaffold by utilizing "nodemon" and the basic "node" command instead of relying on the "npm start" command?

Instructions on obtaining a distinct daily array from the weather API array that provides a detailed 5-day weather report every 3 hours

Angular's implementation of a web socket connection

Struggling to generate components using JQuery

Is there a way to convert time measurements like minutes, hours, or days into seconds in React and then pass that information to an

Is there a method to preserve the received data after it has been retrieved?

Is it possible to extract data from a JavaScript Array using scraping techniques?

Identifying the Origin of the Mouse Pointer When Hovering Over Elements

What is the best way to execute fetch calls in sequence (A -> B -> C) within a React component?

The Angular JS routes are not properly loading the required file from the provided TemplateURL when receiving a response from Node

Ways to avoid encoding Unicode characters in JavaScript programming

Guide: Implementing Vuex store within a plugin

Displaying mysqli results within a div while incorporating an onclick event for a javascript function that also includes another onclick event for a separate javascript function

The localhost successfully accessed req.session.userid, but unfortunately the virtual host cannot be reached at this time

javascript retrieving JSON data through an API request from a redirected URL