Скачать или смотреть Create a Select Menu in React from a Comma-Separated String Using GraphQL

Learn how to display a `select menu` in your React app using data fetched via GraphQL. This guide breaks down the steps for transforming a comma-separated string into usable options.
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Create a Select Menu in React from a Comma-Separated String Using GraphQL

When building a web application with React and GraphQL, one common requirement is dynamically displaying data in a user-friendly format. For example, you may want to create a select menu containing options derived from a comma-separated list. In this guide, we’ll go through the steps to achieve this using a simple example of vehicles and their makes.

Introduction to the Problem

Imagine you’re developing an application where you list vehicles along with their corresponding makes. You have a backend set up using Strapi as your GraphQL server, and a Vehicle collection that contains two fields: name (e.g., "car") and makes (e.g., "volvo, saab, audi, ford"). Here’s what you want to accomplish:

Display the vehicle name.

Create a select menu that lists the makes based on the comma-separated string.

Fetching Data with GraphQL

To get started, we need to fetch vehicle data from the GraphQL server. Below is the query that would be used to obtain all vehicle records, along with the required fields.

[[See Video to Reveal this Text or Code Snippet]]

This query fetches a list of vehicles from your GraphQL API, gathering the id, name, and makes fields.

The React Component

Next, we’ll create a React component that utilizes this query. Let’s break down the implementation into manageable parts.

Using the Query Inside the Component

Start by setting up your component to make the query and handle loading states.

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Query Execution: We utilize the useQuery hook to call our GET_ALL_CARS GraphQL query. This provides us with a data object and a loading state that we can handle in our component.

Handling States: We check if the data is still loading or if no data was returned, displaying appropriate messages in each case.

Rendering the Select Menu:

We iterate over each vehicle from the fetched data.

For each vehicle, we display its name.

Within the <select> tag, the makes string is split by commas with the split(",") method, turning it into an array.

We then map through this array to create individual <option> elements for each make.

Key Points to Remember

When working with comma-separated strings, use JavaScript’s split() to convert these strings into an array.

Always ensure to handle loading and error states for a better user experience.

Each child element in a loop should have a unique key, which helps React optimize rendering.

Conclusion

Creating a select menu in a React application from a comma-separated string fetched via GraphQL can be accomplished with minimal code. By following the steps outlined in this post, you’ll enhance your understanding of how to map through data effectively and present it in a structured way.

Now you’re ready to display dynamic select menus in your own React applications!