MobileCRM.UI.MediaTab.clear - Resconet/JSBridge GitHub Wiki
Clears the content of this media tab.
This example demonstrates how to clear the media tab content.
MobileCRM.UI.EntityForm.requestObject(function (entityForm) {
// get media tab by its name
var media = entityForm.getMediaTab("DocumentAction");
media.clear();
}, MobileCRM.bridge.alert, null);