PostMessage API

Action_Load_Resp

success: <boolean>
result:  <string>
errorMsg: <string>

Acknowledgment when load finishes. success tells if COOL was able to load the document successfully.

result contains the reason the document was not loaded.

errorMsg contains a detailed error message in case loading failed. Probably it will contain the error message returned from the WOPI host.

FollowUser_Changed

FollowedViewId: <Number>
IsFollowUser: <Boolean>
IsFollowEditor: <Boolean>

Notification about current following state.

FollowedViewId tells which user is followed.

IsFollowUser determines if following the specific user is activated.

IsFollowEditor determines if following the editor is activated.

If both IsFollowUser and IsFollowEditor are false then following is inactive.

Host_VersionRestore

Status: <string>

The Only possible value is Pre_Restore.

This message is sent by the host before actually restoring the document and after user showed the intent to restore the document.

This is so such that if there are any unsaved changes, Online can save them to storage before document is restored.

App_VersionRestore

Status: <string>

This is the reply for the Host_VersionRestore message.

Possible values for Status (for now) is: Pre_Restore_Ack.

It means that host can go ahead with restoring the document to an earlier revision.

Insert_Button

id: <string>
imgurl: <string>


hint: <string>

accessKey: <string>

mobile: <boolean>
tablet: <boolean>

label: <string>


insertBefore: <string>


unoCommand: <string>

Inserts a button to the top toolbar. It responds with Clicked_Button post message event on which hosts can react accordingly (except when the unoCommand id parameter is a unique id of the toolbar button. It is recommended to prefix such ids given here given here with some host namespace so that it doesn’t conflict with existing toolbar IDs. In case of conflict, button is not added. imgurl parameter is the link to the image that will be set as button image in the toolbar. The ideal size of the image is 24x24px. The image must be hosted on the host URL to not violate Content-Security-Policy. hint This is used as a tooltip of the button.

This is used by acceleratore definitions class. Users can press alt or alt+shift and use this key. One should be careful to not introduce conflicting access keys. mobile whether the button should be shown when the interface switches to mobile mode. tablet whether the button should be shown in tablet mode (true if absent)

label When a read-only document is opened, we don’t have the toolbar at all. In this case, this newly added button is present in file menubar. The text against this label is used as text of the menubar item.

insertBefore Specify the position where the button should be inserted. insertBefore is the button ID (see Finding toolbar button IDs).

unoCommand UNO Command to be executed on button click (Reference). When this property is set, no ‘Clicked_Button’ response is sent. The button click will be handled by LibreOffice.

Show_Button

id: <string>

Hides a button from the toolbar.

id is the button ID (see Finding toolbar button IDs).

Remove_Statusbar_Element

id: <string>

Removes an element from the status bar. id is the element ID (see Finding status bar element IDs).

Show_Menubar

Shows the menu bar.

Hide_Ruler

Hides the horizontal document ruler (Writer only)

Hide_Menu_Item

id: <string>

Hides an item from the menu.

id is the item ID as defined in the browser/src/control/Control.Menubar.js.

Disable_Default_UIAction

action: <string>
action: <string>
disable: <Boolean>

Disable the default handler and action for a UI command.

action is the action name to enable/disable the default action for. disable controls whether to disable (true) or enable (false) the default action. When set to true, the given UI command will only issue a postMessage without invoking the default action, leaving it up to the client to intercept the postMessage event and handle as necessary. Notice that some actions do not have any default handler to begin with (such as UI_SaveAs and UI_Share) and therefore this will have no effect on them; they only issue postMessage notification anyway without taking any action beyond that. For example, UI_Save will be issued for invoking the save command (from the menu, toolbar, or keyboard shortcut) and no action will take place if ‘UI_Save’ is disabled via the Disable_Default_UIAction ``ommand. Clients who disable ``UI_Save  `` should then issue ``Action_Save themselves, when and if they desire to save the document. Similarly, when disabling UI_Close, the document will not close upon invoking the UI_Close action, instead a postMessage notification will be issued and it will be up to the client to issue Action_Close when they desire. Clients must be careful not to issue duplicate actions when the default handler is enabled, instead, they should only issue actions themselves when the default is disabled. Note: currently only UI_Save and UI_Close are supported.

Clicked_Button

id: <string>

This event is emitted when the custom button added

via Insert_Button API above is clicked.

UI_CreateFile

Requests WOPI host to open a new browser tab and create a new document. The document type is passed as DocumentType argument, and can be ‘text’,’spreadsheet’,’presentation’ or ‘drawing’.

UI_Cancel_Password

Notifies WOPI host that the user clicked on the ‘cancel’ option when opening a password protected file, instead of providing the password to decrypt it.

Doc_ModifiedStatus

Notification to update the modified status of the document. Values.Modified will be true, if the document has been modified since the last save, otherwise, it will be false if the document has been saved.

Note that this notification may be published without a change from the prior value, so care must be taken to check the Values.Modified value and not assume the notification itself implies the modified state of the document on its own.

CallPythonScript

script. The Values
ScriptFile: <string>
Function: <string>
Values: <object>

Calls a Python parameter contains an object with named

parameters that are passed to the script.

CallPythonScript-Result

commandName: <string>
Values: <object>

Returns the result The URL of the script called

is in the commandName parameter.

UI_Mention

type: autocomplete
text: <string>

When user starts typing with “@”, CollaboraOnline will send this postMessage with partial text followed by “@” to get the list of usernames from the integrator

Action_Mention

list: [{
          username: "example-username1",
          profile: "link-to-the-profile"
        },
        {
          username: "example-username2",
          profile: "link-to-the-profile"
        }.....]

Based on UI_Mention message of type autocomplete, integrator should send this message with list of user object. Each user object contains username and profile