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Learn how to easily send values, like IDs, to routes in your JavaScript applications when a button is clicked.
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How to Send Values Through Buttons for Routing in JavaScript Applications

When developing web applications using frameworks like Node.js or React, it's common to have scenarios where you need to send specific values through buttons when navigating to a different route. For instance, say you are building an event management application and you need to direct users to a check-in page, along with sending the ID of the event they are checking into. In this guide, we will explain how to achieve this in a clear, step-by-step manner.

The Challenge

As a beginner, you might have encountered situations where you wanted to send information—like an event ID—to a new route, such as "/checkin," when a button is clicked. Here's a sample of what your button might look like in HTML:

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In the code excerpt above, although the button navigates to the check-in route, it does not pass along any information about which event the user is checking in for. So, how can we include that crucial event ID in the URL when the button is clicked?

The Solution

The good news is that you can easily achieve this by modifying the href attribute of your anchor tag to include the event ID in the query string. Here's how you can do it:

Option 1: Concatenating Strings

You can dynamically create the URL by concatenating the event ID with the check-in route. Below is an example of how this can be done:

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

Option 2: Template Literals

If you are using modern JavaScript (ES6 and above), you can take advantage of template literals, which offer a more readable and cleaner syntax. Here’s how this option looks:

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

Retrieving the Event ID on the Check-in Page

Once the user clicks the button and is redirected to the "/checkin" route, we need a way to access the event ID that was sent through the URL. You can do this using the following JavaScript code:

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

How This Works

URLSearchParams: This JavaScript object helps us parse the query string of the URL, which consists of key-value pairs.

window.location.search: This property retrieves the query string part of the URL (everything after the ?).

get('EventId'): This method helps us extract the value associated with the "EventId" key from the parsed URL.

Conclusion

Sending values through buttons in your application is a straightforward process. By modifying the href attribute on your buttons to include the necessary parameters, you can seamlessly pass information like event IDs to different routes. Using either string concatenation or template literals allows you to customize your links easily. And retrieving those values on the destination page is effortless with JavaScript.

We hope this guide has clarified how to send values through buttons for routing! If you have any questions or need further clarification, feel free to leave a comment below.