diff --git a/src/additional/maxsize.js b/src/additional/maxsize.js
new file mode 100644
index 000000000..148d4b609
--- /dev/null
+++ b/src/additional/maxsize.js
@@ -0,0 +1,30 @@
+// Require a file at/under a given size
+// Usage: `{rules: {file: {maxsize: 5 * 1024 * 1024 /* 5MB */}}}`
+$.validator.addMethod("maxsize", function(value, element, param) {
+ // If the value is optional, return it
+ var maxSize = param,
+ optionalValue = this.optional(element),
+ i, len, file;
+ if (optionalValue) {
+ return optionalValue;
+ }
+
+ // If the element is a file, then verify the size is at most what we expect
+ if ($(element).attr("type") === "file") {
+ // If we are in a browser that supports FileList, then check the files
+ if (element.files && element.files.length) {
+ i = 0;
+ len = element.files.length;
+ for (; i < len; i++) {
+ file = element.files[i];
+ // `file.size` is size in bytes
+ if (file.size > maxSize) {
+ return false;
+ }
+ }
+ }
+ }
+
+ // Return success (either we don't have access to files due to older browser or files looked good)
+ return true;
+}, $.validator.format("Please submit a file that is under the maximum size."));
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