Innovative React Component for Dynamic Background Images

I am currently working on a feature that requires me to dynamically select the backgroundImage based on the value of item.imageLinks.smallThumbnail.

If the API response includes a URL for smallThumbnail, I want to use that as the backgroundImage. Otherwise, I would like to default to a local image called book.png located inside ../public.

However, I'm encountering issues with my code. When item.imageLinks.smallThumbnail is not defined, it's not falling back to the alternate book.png but instead throwing an error:

Type Error: Cannot Read 'smallThumbnail' of undefined

I would appreciate any help or guidance on this matter.

Thank you.

return(
        <ol className="books-grid">
          {book.map( (item)  => (
              <li key={item.id}>
                <div className="book">
                  {item.shelf && (
                      <div className="book-top">
                        <div 
                          className="book-cover" 
                          style={{ width: 128, height: 193, backgroundImage: `url({${item.imageLinks.smallThumbnail} || ../public/book.png } )` }}></div>
htmlcssreactjs

Answer №1

In the case that imageLinks is not defined, it indicates that it is not an object which means you will not be able to utilize dot syntax. This results in an error when attempting to access the property smallThumbnail.

Consider utilizing the code below instead:

<div
  className="book-cover"
  style={{
    width: 128,
    height: 193,
    backgroundImage: `url(${(item.imageLinks && item.imageLinks.smallThumbnail) || "../public/book.png"})`
  }}
></div>

This way, you are first verifying the existence of imageLinks.

Answer №2

In the case that your imageLinks is not a defined property, you can manage it in the following way:

let imageUrl = item.imageLinks ? item.imageLinks.smallThumbnail : '../public/book.png';

return(
  <ol className="books-grid">
    {book.map( (item)  => (
        <li key={item.id}>
          <div className="book">
            {item.shelf && (
                <div className="book-top">
                  <div 
                    className="book-cover" 
                    style={{ width: 128, height: 193, backgroundImage: `url(${imageUrl})` }}></div>

Answer №3

To address the issue in your code where item.imageLinks is not defined, it is important to make a modification to this specific line:

`url({${item.imageLinks.smallThumbnail} || ../public/book.png })`

If imageLinks is undefined, the line will cause an error.

An alternative approach would be to use the ternary operator as shown below:

`url({${(item && item.imageLinks && item.imageLinks.smallThumbnail) ? item.imageLinks.smallThumbnail : `../public/book.png`} })`

However, this can be challenging to decipher.

One suggestion for improvement could be restructuring your code by creating an array of objects at the beginning of your render method. This array would store both the image and its URL for each item, allowing you to iterate over it within your rendering process.

Answer №4

I have successfully resolved the issue and below is the code that fixed it.

return(
        <ol className="books-grid">
          {book.map( (item)  => (
              <li key={item.id}>
                <div className="book">
                  {item.shelf && (
                      <div className="book-top">
                        <div className="book-cover" style={{ width: 128, height: 193, backgroundImage: `url(${(item.imageLinks && item.imageLinks.smallThumbnail) || "book.jpg"})` }}></div>

One useful trick I picked up here is using && to check for undefined in order to prevent JS errors. Thank you to everyone who helped!

Answer №5

Here is an example of utilizing React JS:

import React, { Component, Fragment } from 'react' import { Link } from 'react-router-dom'

const BlogPost = (data) => { return ( 

        <div
            style={{
                backgroundImage: `linear-gradient(
                325deg,
                rgba(0, 36, 51, 1) 0%,
                rgba(98, 218, 255, 0.164) 100%
                ),url(${(data.img)})`
            }} className="cardService">
            <div>
                    <h1 className='serviceTitle'>{data.name}</h1>
                    <h6 className='serviceDescription'>{data.description}</h6>
            </div>
        </div>
    </Fragment>
)

}

export default BlogPost;

Answer №6

Check out this piece of code that has been working perfectly for me; I found that enclosing it in double quotes did the trick.

const imageUrl = item.imageLinks ? item.imageLinks.smallThumbnail : '../public/book.png';

return(

<div className="book-cover" style={{ width: 128, height: 193, backgroundImage: `url("${imageUrl}")` }}></div>

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

Skip nodes in Polymer 1.0 by using ExcludeLocalNames

I recently attempted to transition from Polymer version 0.5 to 1.0 and came across a particular question: Is there a way to exclude certain nodes inside a paper-menu? In the previous version (0.5), you could use the attribute excludedLocalNames to achieve ...

javascripthtmlpolymer

Modifying the alignment of Angular elements within the router-module to complement an established CSS grid

I'm facing an issue with my angular reactive-form project. I have successfully set up everything except routing. After defining all the routes in the app.module.ts file, things started getting messy. In my basic form, I had a responsive CSS grid with ...

cssangularformsgridangular-router

Having difficulty replicating the same effect across all five canvas elements

After following the code provided by j08691 here for canvas, everything worked flawlessly. However, I encountered an error in JavaScript when trying to implement it on multiple canvas elements. As a beginner in JavaScript, I would greatly appreciate any as ...

javascripthtmlcanvas

Can I apply CSS styling to an entire row within a column?

When using the Bootstrap 4 Grid system, my structure looks like this: https://i.sstatic.net/MB2C7.png Inside each row, I have a content column and two empty columns. At times, I need to style the entire row with CSS. <div class="container"> <d ...

cssbootstrap-4grid-layout

Locating a dynamically generated element in jQuery without any associated events

While this question may have been raised in the past, the answer lies within this code snippet: $('#container').on('click','#dynamicElement', function(){ /* the code */ }); The code provided above targets the #dynamicElement ...

javascriptjqueryhtmlajaxdynamically-generated

Tips for updating the submit button title in HAML

Just getting started with Haml, I have a form that contains two submit buttons. In order to differentiate and handle them in the Controller, each button requires its own unique name. For example, in HAML: = program_form.submit I18n.t('texts.6OA&apos ...

htmlruby-on-railsrubyhaml

The images on the carousel fail to load unless I adjust the window size

After investing countless hours into finding a solution, I am still unable to resolve this issue. The problem lies within my use of a Carousel and setting the images through a javascript file. Strangely enough, upon loading the page, only the first image ...

javascripthtmlcssswiper.js

Enhancing this testimonial slider with captivating animations

I have designed a testimonial slider with CSS3 and now I am looking to enhance it by adding some animation using Jquery. However, I am not sure how to integrate Jquery with this slider or which plugins would work best for this purpose. Can anyone provide g ...

javascriptjquerycss

Tips on choosing a child element with a parameter in React

Is it possible to pass a parameter in my function and use it to select a child of my JSON parse? I want to create a function (checkMatch) that can check if a username in my database matches with the input value. It should return 1 if there is a match, oth ...

javascriptjsonreactjsforeach

Distinguish between the iOS native UIWebView and an iOS desktop web app

When using the navigator.useragent request, I am able to gather information about all browsers or webkits. However, I am having trouble distinguishing between a webapp (iOS desktop bookmark) and a native app iOS webkit as they both provide the same info ...

javascriptiosxcodehtml

Set up bootstrap 5 on your website while incorporating the beloved color scheme of bootstrap

Bootstrap has introduced new color schemes in version 5 compared to version 4. Is it possible to update to Bootstrap 5 while retaining the original color palette of Bootstrap 4 without the need for manual file adjustments? Are there any content delivery ...

cssbootstrap-4bootstrap-5

Arrange a variety of images with different dimensions in a narrow row while keeping the width fixed and adjusting the height accordingly

Imagine you have a collection of 3 (or more) images, each with different sizes and aspect ratios, within a fixed-width div (for example width:100%): <div class="image-row"> <img src="1.png"> <img src="2.png"> <img src="3.png" ...

htmlcssimageflexboxalignment

Creating a hyperlink within an @Html.LabelFor tag

In my current asp.net mvc project, I have a code snippet that generates a name like this - @Html.LabelFor(x => x.ReturnAirTemperature, new { style = "position: absolute;top: 310px;left: 18px;z-index: 10000;font-weight:bold" }) Here is the model associ ...

htmlasp.net-mvcrazor

Tips for linking a composite element while utilizing React's forward ref (attribute is not present on forwardRefExoticComponent)

In my Panel component, I have implemented the option for users to utilize compound components. The default header of the panel includes a close button, but I designed it this way to give users the flexibility to create their own custom headers with differe ...

reactjstypescript

Converting background-position: % to Tailwind: A step-by-step guide

Struggling to translate background-position: 0% 20%; into Tailwind classes I can only locate bg-{side} classes Any assistance would be greatly appreciated ...

csstailwind-css

What is the process for transmitting cookies to a socket.io client from a server?

When working with my client, I have the following code snippet: useEffect(() => { socket.emit('login', myLoginCode) }, []) Previously on the server side, I used this logic: app.get('login', (req, res) => { const c ...

reactjsexpresssocket.io

Adding a sign at the center of a map in React-Leaflet

One of the features I added to the map is a center indicator sign. <MapContainer fullscreenControl={true} center={center} zoom={18} maxNativeZoom = {22} maxZoom={22} classNa ...

javascriptcssreactjsleafletreact-leaflet

What is the best method for obtaining the various values of a checkbox?

I have designed a form where users can select multiple options using checkboxes. My goal is to display the selected options in the console log. However, I am facing an issue where the console.log only shows true or false for each choice upon submission. C ...

javascriptreactjscheckboxreact-hooksmaterial-ui

Unable to adjust the width of a Bootstrap table

I'm currently working with a bootstrap table that looks like this <table class="table table-bordered table-striped table-highlight"> <tbody> <tr> <td align="center" style="width:30%"><input type="text" class="form-control ...

jqueryhtmlcsstwitter-bootstrap

Issues with testing incorporating jest, react, webpack, and SVG

I recently delved into the world of React development, but I've hit a snag when trying to run a test with an SVG file. You can find the code in my GitHub repository https://github.com/alejomongua/react-playground. Upon running npm run test, I encoun ...

javascriptnode.jsreactjssvgjestjs