How to Convert JavaScript Code for Image Uploading to Work on Button Click

Learn how to modify your JavaScript code to upload images to Imgur only when a user clicks the upload button, rather than on file selection.
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How to Convert JavaScript Code for Image Uploading to Work on Button Click

If you are building a web application that involves uploading images, you might want to control when the upload occurs. By default, some scripts execute immediately when a file is selected, but what if you want the upload to happen only when a user clicks a button? In this post, we will explain how to modify your JavaScript code to achieve this!

The Problem

You have a JavaScript code that uploads images to Imgur as soon as a user selects a file. However, you want to change this behavior so that the image is uploaded only when the user explicitly clicks an "Upload" button.

The current setup would look like this:

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

The Solution

To modify the code, we'll introduce a function that handles the upload and separate the file selection event from the upload trigger. Let’s walk through the steps:

Step 1: Update the HTML

We will retain the HTML structure and add a button for uploading. Here is what the updated structure looks like:

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

Step 2: Modify the JavaScript Code

Next, we need to tweak the JavaScript:

Store the Current File:
We'll keep track of the uploaded file in a variable when the user selects it.

Create an upload Function:
This function will handle the upload process when the button is clicked.

Here’s how the final JavaScript code portion looks:

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

Summary of Changes

File Selection: The file is chosen and stored upon the change event.

Upload Trigger: The upload process is initiated only when the "Upload" button is clicked.

Display: Once successfully uploaded, the image and URL are displayed.

Conclusion

By separating the file selection and upload processes, you give control back to the user, ensuring they don't accidentally upload an image before they're ready. Now, your users can select a file and only initiate the upload by clicking the button. Give it a try, and enjoy building your image uploading feature with more user interaction!