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@Julian-Nash
Created February 22, 2019 19:56
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File upload with progress bar, cancel and percent complete - XMLHTTPRequest (Bootstrap 4)
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<title>Upload video</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col">
<div class="mb-3 mt-3">
<h2 class="mb-3" style="font-weight: 300">Upload video</h2>
<div class="form-group mb-3">
<div class="custom-file">
<input type="file" class="custom-file-input" name="file_input" id="file_input" oninput="input_filename();">
<label id="file_input_label" class="custom-file-label" for="image">Select file</label>
</div>
</div>
<button onclick="upload('{{ request.url }}');" id="upload_btn" class="btn btn-primary">Upload</button>
<button class="btn btn-primary d-none" id="loading_btn" type="button" disabled>
<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
Uploading...
</button>
<button type="button" id="cancel_btn" class="btn btn-secondary d-none">Cancel upload</button>
</div>
<div id="progress_wrapper" class="d-none">
<label id="progress_status"></label>
<div class="progress mb-3">
<div id="progress" class="progress-bar" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
</div>
<div id="alert_wrapper"></div>
</div>
</div>
</div>
<script>
// Get a reference to the progress bar, wrapper & status
var progress = document.getElementById("progress");
var progress_wrapper = document.getElementById("progress_wrapper");
var progress_status = document.getElementById("progress_status");
// Get a reference to the 3 buttons
var upload_btn = document.getElementById("upload_btn");
var loading_btn = document.getElementById("loading_btn");
var cancel_btn = document.getElementById("cancel_btn");
// Get a reference to the alert wrapper
var alert_wrapper = document.getElementById("alert_wrapper");
// Get a reference to the file input element & input label
var input = document.getElementById("file_input");
var file_input_label = document.getElementById("file_input_label");
// Function to show alerts
function show_alert(message, alert) {
alert_wrapper.innerHTML = `
<div id="alert" class="alert alert-${alert} alert-dismissible fade show" role="alert">
<span>${message}</span>
<button type="button" class="close" data-dismiss="alert" aria-label="Close">
<span aria-hidden="true">&times;</span>
</button>
</div>
`
}
// Function to upload file
function upload(url) {
// Reject if the file input is empty & throw alert
if (!input.value) {
show_alert("No file selected", "warning")
return;
}
// Create a new FormData instance
var data = new FormData();
// Create a XMLHTTPRequest instance
var request = new XMLHttpRequest();
// Set the response type
request.responseType = "json";
// Clear any existing alerts
alert_wrapper.innerHTML = "";
// Disable the input during upload
input.disabled = true;
// Hide the upload button
upload_btn.classList.add("d-none");
// Show the loading button
loading_btn.classList.remove("d-none");
// Show the cancel button
cancel_btn.classList.remove("d-none");
// Show the progress bar
progress_wrapper.classList.remove("d-none");
// Get a reference to the file
var file = input.files[0];
// Get a reference to the filename
var filename = file.name;
// Get a reference to the filesize & set a cookie
var filesize = file.size;
document.cookie = `filesize=${filesize}`;
// Append the file to the FormData instance
data.append("file", file);
// request progress handler
request.upload.addEventListener("progress", function (e) {
// Get the loaded amount and total filesize (bytes)
var loaded = e.loaded;
var total = e.total
// Calculate percent uploaded
var percent_complete = (loaded / total) * 100;
// Update the progress text and progress bar
progress.setAttribute("style", `width: ${Math.floor(percent_complete)}%`);
progress_status.innerText = `${Math.floor(percent_complete)}% uploaded`;
})
// request load handler (transfer complete)
request.addEventListener("load", function (e) {
if (request.status == 200) {
show_alert(`${request.response.message}`, "success");
}
else {
show_alert(`Error uploading file`, "danger");
}
reset();
});
// request error handler
request.addEventListener("error", function (e) {
reset();
show_alert(`Error uploading file`, "warning");
});
// request abort handler
request.addEventListener("abort", function (e) {
reset();
show_alert(`Upload cancelled`, "primary");
});
// Open and send the request
request.open("post", url);
request.send(data);
cancel_btn.addEventListener("click", function () {
request.abort();
})
}
// Function to update the input placeholder
function input_filename() {
file_input_label.innerText = input.files[0].name;
}
// Function to reset the page
function reset() {
// Clear the input
input.value = null;
// Hide the cancel button
cancel_btn.classList.add("d-none");
// Reset the input element
input.disabled = false;
// Show the upload button
upload_btn.classList.remove("d-none");
// Hide the loading button
loading_btn.classList.add("d-none");
// Hide the progress bar
progress_wrapper.classList.add("d-none");
// Reset the progress bar state
progress.setAttribute("style", `width: 0%`);
// Reset the input placeholder
file_input_label.innerText = "Select file";
}
</script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js"></script>
</body>
</html>
@abdurrahmanisha1
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