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-rw-r--r--web/react/utils/utils.jsx33
1 files changed, 33 insertions, 0 deletions
diff --git a/web/react/utils/utils.jsx b/web/react/utils/utils.jsx
index 8a4d92b85..aa59201cb 100644
--- a/web/react/utils/utils.jsx
+++ b/web/react/utils/utils.jsx
@@ -557,6 +557,23 @@ module.exports.splitFileLocation = function(fileLocation) {
return {'ext': ext, 'name': filename, 'path': filePath};
}
+// Asynchronously gets the size of a file by requesting its headers. If successful, it calls the
+// provided callback with the file size in bytes as the argument.
+module.exports.getFileSize = function(url, callback) {
+ var request = new XMLHttpRequest();
+
+ request.open('HEAD', url, true);
+ request.onreadystatechange = function() {
+ if (request.readyState == 4 && request.status == 200) {
+ if (callback) {
+ callback(parseInt(request.getResponseHeader("content-length")));
+ }
+ }
+ };
+
+ request.send();
+};
+
module.exports.toTitleCase = function(str) {
return str.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
}
@@ -847,4 +864,20 @@ module.exports.getWindowLocationOrigin = function() {
windowLocationOrigin = window.location.protocol + "//" + window.location.hostname + (window.location.port ? ':' + window.location.port: '');
}
return windowLocationOrigin;
+}
+
+// Converts a file size in bytes into a human-readable string of the form "123MB".
+module.exports.fileSizeToString = function(bytes) {
+ // it's unlikely that we'll have files bigger than this
+ if (bytes > 1024 * 1024 * 1024 * 1024) {
+ return Math.floor(bytes / (1024 * 1024 * 1024 * 1024)) + "TB";
+ } else if (bytes > 1024 * 1024 * 1024) {
+ return Math.floor(bytes / (1024 * 1024 * 1024)) + "GB";
+ } else if (bytes > 1024 * 1024) {
+ return Math.floor(bytes / (1024 * 1024)) + "MB";
+ } else if (bytes > 1024) {
+ return Math.floor(bytes / 1024) + "KB";
+ } else {
+ return bytes + "B";
+ }
};