gistfile1.txt

<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
  <CustomAction Id="6b235f4e-b887-414f-94f9-e59cdc0d4637.RibbonCustomAction1"
                RegistrationType="List"
                RegistrationId="101"
                Location="CommandUI.Ribbon"
                Sequence="10001"
                Title="Invoke &apos;RibbonCustomAction1&apos; action">
    
    <CommandUIExtension>
      <!-- 
      Update the UI definitions below with the controls and the command actions
      that you want to enable for the custom action.
      -->
      <CommandUIDefinitions>
        <CommandUIDefinition Location="Ribbon.Documents.Manage.Controls._children">
          <Button Id="Ribbon.Documents.Manage.RibbonCustomAction1Button"
                  Alt="Request Ribbon CustomAction"
                  Sequence="100"
                  Command="Invoke_RibbonCustomAction1ButtonRequest"
                  LabelText="Request Ribbon CustomAction"
                  TemplateAlias="o1"
                  Image32by32="_layouts/15/images/placeholder32x32.png"
                  Image16by16="_layouts/15/images/placeholder16x16.png" />
        </CommandUIDefinition>
      </CommandUIDefinitions>
      <CommandUIHandlers>
        
        <CommandUIHandler Command="Invoke_RibbonCustomAction1ButtonRequest" CommandAction="javascript:alert('Hello');" />
      </CommandUIHandlers>
    </CommandUIExtension >
  </CustomAction>
</Elements>