Client Validation of Attachments by File Type and Count (#1970)

* Create code.js

* Create README.md

Author: chetnadev

Client-Side Components/Client Scripts/Client Validation of Attachments by File Type and Count/README.md

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+This ServiceNow client script is designed to validate file attachments on a form before submission. It's most likely used as a "Client Script" or "Client Script in a Catalog Item" that runs in the browser when a user tries to submit a form.
+
+This client script runs when a form is submitted in ServiceNow. It checks if the user has:
+
+Attached at least one file (shows an error if none).
+Attached no more than three files (shows an error if more).
+Only uploaded files of type PDF or PNG (shows an error for other types).
+If any of these checks fail, the form submission is blocked and an appropriate error message is displayed.

Client-Side Components/Client Scripts/Client Validation of Attachments by File Type and Count/code.js

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+(function executeRule(gForm, gUser, gSNC) {
+    var attachments = gForm.getAttachments();
+    if (!attachments || attachments.length === 0) {
+        gForm.addErrorMessage("You must attach at least one file.");
+        return false;
+    }
+
+    if (attachments.length > 3) {
+        gForm.addErrorMessage("You can only upload up to 3 files.");
+        return false;
+    }
+
+    var allowedTypes = ['pdf', 'png'];
+    for (var i = 0; i < attachments.length; i++) {
+        var fileName = attachments[i].file_name.toLowerCase();
+        var ext = fileName.split('.').pop();
+        if (!allowedTypes.includes(ext)) {
+            gForm.addErrorMessage("Only PDF and PNG files are allowed.");
+            return false;
+        }
+    }
+
+    return true;
+})(gForm, gUser, gSNC);