How to Display an <a> Tag with an Optional href Attribute in React

Introduction

When developing an application to cater to various types of end users, conditional rendering allows you to handle both predefined and dynamic cases without hardcoding solutions. This approach keeps the code clean, concise, and readable, while managing many possibilities with simple structural logic.

In this guide, you’ll learn how to render an anchor element (<a>) in your React app with an optional href attribute based on specific conditions.

Overview of the Anchor Tag

The anchor tag in HTML (<a>) is used to navigate to different web pages via the href attribute. This attribute contains the URL or path to the destination page, which can be either relative or absolute. In React, relative URLs should be handled by the Link component provided by React Router, while anchor tags should be reserved for absolute paths. Relative URLs are typically for in-app navigation, like routing within the app, whereas absolute paths link to external sites. The logic for rendering an optional href can be extended to the Link component or any other JSX element or component.

Optional Rendering: Use Case and Solution

Consider a use case where you maintain a database of job applicants. On the frontend, you receive data in the following format:

user = {
    name: '',
    email: '',
    sector: '',
    linkedinHandle: '',
    ...
}

If the LinkedIn handle is not mandatory, some users might leave it blank. While rendering this data, you might do something like this:

<a href={user.linkedinHandle}></a>

If the backend returns an empty string, the href will also be an empty string, which isn’t optimal. If linkedinHandle doesn’t exist for a user, the <a> tag shouldn’t be visible. An empty but clickable link pointing nowhere is not user-friendly and could cause errors if the property is null or undefined. The correct solution is to use conditional rendering to show the <a> tag only if the href exists.

Creating a New Project

Ensure you have Node.js and npm installed (at least version 8 or higher), along with a code editor and a web browser (preferably Chrome or Firefox).

Create a new project using Create React App:

bashCopy codenpx create-react-app optional-href-rendering

Cleaning up the Template

For simplicity, we’ll handle all the code inside App.js. Remove the logo, App.css, and their imports from App.js. Clean out the starter template inside the App component. Your App.js should look like this:

import React from 'react';

function App() {
  return (
    <div className="App">
      
    </div>
  );
}

export default App;

Setting State for Toggling Condition

Usually, the condition is based on the data from the backend, but you can use a toggling state for a more dynamic understanding of the rendering. Assume data from the backend and set a toggling state to either true or false. If true, the href will be rendered; if false, it won’t be.

import React, { useState } from 'react';

function App() {
  const [state, setState] = useState(false);
  let url = "";
  return (
    <div className="App">
     <a href={url}>LinkedIn handle</a>
    </div>
  );
}

export default App;

This renders an <a> tag with an empty href, but it’s still clickable. Let’s add conditional rendering to it.

Optionally Rendering an Element

If the href attribute exists, set the state to true and show the <a> tag; otherwise, display a message. Wrap the message in a JSX element and assign it to a variable for conditional output.

let element = <p>No handle exists for this user!</p>;

Using an If Statement

Before rendering, check if the state is true and assign the <a> tag to element; otherwise, render as is.

import React, { useState } from 'react';

function App() {
  const [state, setState] = useState(false);
  let url = "";
  let element = <p>No handle exists for this user!</p>;
  if (state) element = <a href={url}>LinkedIn handle</a>;
  return (
    <div className="App">
      {element}
    </div>
  );
}

export default App;

Since the state is initially false, the message is displayed. Setting it to true will render the link.

Using the Ternary Operator

You can also use a ternary operator to keep the code more readable.

let element = state ? <a href={url}>LinkedIn handle</a> : <p>No handle exists for this user!</p>;

Using the && Operator

If you don’t want to display an element for the false state, use the && operator.

import React, { useState } from 'react';

function App() {
  const [state, setState] = useState(false);
  let url = "";
  let element = <a href={url}>LinkedIn handle</a>;
  return (
    <div className="App">
      {state && element}
    </div>
  );
}

export default App;

Since the state is evaluated first, the element is not rendered when false. Changing it to true renders the element.

Meeting the Needs of Your App

When implementing your solution, toggle the state using setState within a function that checks the data from the backend. Initialize the state to a logical value depending on your code. If the condition is dynamic, use relevant lifecycle hooks to ensure code integrity. In some cases, a simple JavaScript variable is sufficient, provided its scope is well defined.

By following these guidelines, you can efficiently handle optional href rendering in your React application, ensuring a seamless and user-friendly experience.