VueJS is encountering errors due to certain data not being fully prepared yet

I'm fairly new to VueJS and I am trying to display a background image loaded from an API on my webpage. Unfortunately, the image loading process is not working as expected.

Below is the code snippet:

<template>
    <div id="bio" :style="{ backgroundImage: 'url(' + this.settings.bio_bg.url +')' }">
        <h1>Biography</h1>
        <router-link to="/">Home</router-link><br />
        <span>Biography</span><br />
        <router-link to="/shop">Shop</router-link><br />
        <router-link to="/contact">Contact</router-link><br />
    </div>
</template>

<style scoped>
</style>

<script>
export default {
  data () {
    return {
      settings: {},
      bio: {}
    }
  },
  created () {
      .catch(error => this.setError(error))
    this.$http.secured.get('/settings')
      .then(response => {
        this.settings = response.data
        console.log(this.settings)
      })
      .catch(error => this.setError(error))
  }
}

</script>

The background image is being loaded but I encountered two errors in the console:

Error in render: "TypeError: Cannot read property 'url' of undefined"

Cannot read property 'url' of undefined

I suspect that due to Axios being asynchronous, the data loads after the page rendering completes. Therefore, what would be the correct approach to properly handle this asynchronously?

I have attempted some React-inspired methods but the image still does not load (even though the errors disappear)

Appreciate any advice or guidance. Thank you!

Answer №1

Ensuring that this.settings.bio_bg.url exists right from the initialization of the component is crucial to avoid any rendering errors. One way to achieve this is by setting a 'fake' URL in the original data of the component:

export default {
  data () {
    return {
      settings: {
        bio_bg: {
          url: '',
        }
      },
      bio: {}
    }
  },
  created () {
    this.$http.secured.get('/settings')
      .then(response => {
        this.settings = response.data
        console.log(this.settings)
      })
      .catch(error => this.setError(error))
  }
}

This approach not only prevents errors but also improves code editor intellisense, as it now recognizes that settings includes a bio_bg member with an url.

If you replace the empty string with a real image URL and use a placeholder image, the UI will likely appear more appealing:

  data () {
    return {
      settings: {
        bio_bg: {
          url: 'http://via.placeholder.com/350x150',
        }
      },
      bio: {}
    }
  }

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

How can I implement a progress bar that mimics an exchange platform behind data-table components? [Using Vue and Vuetify]

I am working on a cryptocurrency exchange book simulator and I am trying to implement a progress bar that will be displayed behind the values in a table. https://i.stack.imgur.com/9gVsY.png This is the template for my data-table: < ...

Nested function and the process of breaking out of the parent function

Is it possible to exit out of the main/parent function when I am in a function that was called from inside another function? For example: function(firstFunction(){ //stuff secondFunction() // code continuation if second function doesn't ...

Navigating properties and linking information in React

I'm currently tackling a project that requires me to pass data to two distinct functional components. While my axios call to the API appears to be functioning properly, along with setting the state using hooks, I am continuously encountering two pers ...

Node and Web scraping Promise: a powerful combination

I've been using Cheerio and Node for web scraping, and I thought implementing promises could simplify handling asynchronous code. However, my attempt to chain promises hasn't been successful. Below is the code I'm working with, in hopes that ...

Using Node.js for building a single-page web application

Currently, I am exploring the use of express.js for the backend and JavaScript on the client side for my single page web application. My main concern is about how routing works in express. Should routing be used to bridge the gap between the user interfac ...

Refreshing the state when making changes to ng-repeat through orderBy and/or filter

I'm new to Angular JS and while I understand JavaScript in general, Angular has a different approach that is challenging for me. Specifically, I am struggling with sorting an array of objects by a property and filtering them based on a string provided ...

Do you need to have knowledge in reactjs in order to master react-native?

As I embark on the journey of learning how to build apps using react-native, a burning question arises in my mind: should I first learn react-js before diving into react native? Any guidance or advice would be greatly appreciated. Thank you. ...

Is it possible to design a Typescript type that only contains one property from a defined set and is indexable by that set as well?

I have the different types listed below: type OrBranch = { or: Branch[] } type AndBranch = { and: Branch[] } I need a type called Branch that can either be an OrBranch or an AndBranch. I initially attempted this: type Branch = AndBrand | OrBranch ...

What is the reason behind the varying display of values?

When trying to set a value using the input tag, I encountered an issue. For example, if I type 1000.0009 into the input text, the valid value should be 1000.0001. However, the value displayed in the input tag is incorrect, while the value outside the tag i ...

Having issues with Angular resolver not working as expected?

This demonstration showcases the issue: https://stackblitz.com/edit/angular-routing-with-resolver-observable?file=src%2Fapp%2Fpost-resolver.service.ts Replacing this.observeLoading$ with of(false) resolves the problem, indicating that it may be related t ...

What could be causing my Three.js code to fail during testing?

Recently, I decided to delve into the world of Three.js by following a thorough tutorial. While everything seemed perfectly fine in my code editor of choice (Visual Studio Code 2019), I encountered a frustrating issue when I attempted to run the code and n ...

Iterate through JSON objects

Having an issue with looping through JSON using jQuery AJAX. Despite receiving the JSON data from PHP and converting it to a string, I'm unable to loop through it properly in JavaScript. In my for loop, I need to access $htmlvalue[i] to parse the data ...

Chrome geolocation feature does not display the permission popup for JavaScript

After the latest Chrome update, we have noticed that the popup to Allow/Block accessing a user's location from a website is no longer appearing. We tested this on Edge, Firefox, and different mobile devices, where it seems to be working fine. Current ...

Is there a way to prevent the React history.push from reloading the component every time? I only want

After loading a component and redirecting using history.push, my component renders twice, triggering the componentDidMount() function twice as well. Below is a simplified version of my component. Everything runs fine with componentDidMount() running only ...

Having trouble getting a new input box to be added when clicking with AngularJS?

I am facing an issue with adding dynamic form fields to the database using PHP. I have utilized angular for this purpose, but only the last form field is getting inserted into the database. To address this, I attempted using arrays and loops to increment a ...

Iconic Side Navigation with collapsed button malfunctioning due to negative positioning

I'm facing two issues with my webpage. First: I have three buttons on the right side of my page that are supposed to behave like the buttons on this example. However, when you scroll, you can see that their position is incorrectly displayed "outside" ...

When the screen is at mobile width, elements with the class "Responsive" are hidden using the display:none; property. These elements can be

Hey there! So, I've got this cool interactive banner on my website. It features 2 slider sections with some awesome products on the right side. The layout is responsive, meaning that when you switch to a mobile screen size (around 515px or less), the ...

Using Three.JS 'OrbitControls' in VueJS application results in a black screen appearing?

Currently, I've been delving into the basic cube exercise on Three.js, and incorporating the three.js cube into my Vue.JS application. Initially, everything was functioning smoothly, with my cube rotating as intended using animate, etc. However, thi ...

Modify the heading color of elements in a class to a distinct color when the cursor hovers over the element

I currently have 3 heading elements: elem1, elem2, and elem3. When I hover over elem1, I want elem1 to turn yellow and elem2 and elem3 to turn purple. If I hover over elem2, I want elem2 to be yellow and the others to be purple. Once I release the hover, I ...

jQuery: Choose only one individual div to stay selected

Instructions: Directly underneath the BODY tag, there is a DIV element with the ID of "keepme" that must be retained. All other elements should be removed using the remove() method. Can you accomplish this task using jQuery? Specifically, preserving the s ...