BUGFIX Fixed CSV exporting on GridFieldExporter (was calling action via ajax, which doesn't allow HTTP download responses)

forms/gridfield/GridFieldExporter.php

@@ -47,6 +47,7 @@ class GridFieldExporter implements GridField_HTMLProvider, GridField_ActionProvi
 			null
 		);
 		$button->setButtonIcon('exportlist');
+		$button->addExtraClass('no-ajax');
 		return array(
 			'after' => '<p>' . $button->Field() . '</p>',
 		);

javascript/GridField.js

@@ -105,6 +105,28 @@
 		}
 	});
 
+	/**
+	 * Prevents actions from causing an ajax reload of the field.
+	 * Useful e.g. for actions which rely on HTTP response headers being interpreted nativel
+	 * by the browser, like file download triggers.
+	 */
+	$('.ss-gridfield .action.no-ajax').entwine({
+		onclick: function(e){
+			var self = this, btn = this.closest(':button'), grid = this.getGridField(), 
+				form = this.closest('form'), data = form.find(':input').serialize();
+
+			// Add current button
+			data += '&' + encodeURIComponent(btn.attr('name')) + '=' + encodeURIComponent(btn.val());
+
+			// Include any GET parameters from the current URL, as the view state might depend on it.
+			// For example, a list prefiltered through external search criteria might be passed to GridField.
+			if(window.location.search) data = window.location.search.replace(/^\?/, '') + '&' + data;
+
+			window.location.href = $.path.makeUrlAbsolute(grid.data('url') + '?' + data, $('base').attr('href'));
+			return false;
+		}
+	});
+
 	$('fieldset.ss-gridfield .new-link').entwine({
 		onclick: function(e) {
 			this.getGridField().showDetailView($(this).prop('href'));