05-02-2024, 11:00 AM
I'm currently working on a web project where users need to be able to select an image file and see a preview of the image before it is uploaded to the server. I want to make sure that this whole process is handled client-side to reduce unnecessary server load and to provide immediate feedback to the user. I'm aware that this can be achieved with JavaScript, but I'm having trouble putting all the pieces together. Here's what I have so far:
This snippet is supposed to take the selected file, read it as a Data URL, and then set it as the source of an image tag to provide a preview. However, it doesn't seem to work as expected. Can anyone help me figure out what I might be doing wrong or provide guidance on how to achieve this functionality correctly?
Code:
<input type = "file"
id = "imageInput"
accept = "image/*" / >
// An img element to display the preview
<img id = "imagePreview"
src = ""
alt = "Image preview"
style = "display: none;" / >
// JavaScript for handling the image selection and preview
document.getElementById('imageInput').addEventListener('change', function(event) {
const file = event.target.files[0];
if (file) {
const reader = new FileReader();
reader.onload = function(e) {
document.getElementById('imagePreview').src = e.target.result;
document.getElementById('imagePreview').style.display = 'block';
}
reader.readAsDataURL(file);
}
});
This snippet is supposed to take the selected file, read it as a Data URL, and then set it as the source of an image tag to provide a preview. However, it doesn't seem to work as expected. Can anyone help me figure out what I might be doing wrong or provide guidance on how to achieve this functionality correctly?