Remote File upload in grails
Uploading a file via Ajax is not really possible. You can still upload a file in the background using a hidden iframe and either evaluate the repsonse (which is then inside the iframe) or fire another ajax call after the upload is complete.
<g:form name="upload-form" action="upload" method="post" enctype="multipart/form-data" target="hidden-upload-frame"> File: <input type="file" name="myFile" /> <button type="submit">Upload</button></g:form><iframe id="hidden-upload-frame" name="hidden-upload-frame" style="display: none" onload="onUploadComplete"></iframe><script type="text/javascript"> function onUploadComplete(e) { // Handle upload complete alert("upload complete"); // Evaluate iframe content or fire another ajax call to get the details for the previously uploaded file }</script>Another option is to use a flash based uploading mechanism (eg. swfupload) instead of the iframe.