canvas.toastMessageManager.showErrorToastMessage is the predefined API method to show the error Toast message to the user.
The developer can configure the following parameters for this API:

API Parameter	Description	Sample Value
toastHeader	Indicates the header text for the toast message. The maximum character limit for this parameter is 30. The characters exceeding this limit will not be displayed and only an eclipse (...) will be rendered.	Funds Transfer
toastMessage	Indicates the message that is to be displayed within the toast message. The maximum character limit for this parameter is 40. The characters exceeding this limit will not be displayed and only an eclipse (...) will be rendered.	Transaction Failed.
hideAfterTimer	Indicates the time duration for the toast message. The value for this parameter must be provided in milli-seconds. The default value for this parameter is '3000'.	3000
beforeShow	Indicates the event that can be triggered right before the toast is about to appear. The default value for this parameter is null.	config.beforeShow=function() { launchObjects_create_tickets = { "formId" : "FORM_DEF1", "renderType" : 'WINDOW' } canvas.launch(launchObjects_create_tickets); }
afterShown	Indicates the event that can be triggered after the toast appears. The default value for this parameter is null.	config.afterShown=function() { launchObjects_create_tickets = { "formId" : "FORM_DEF1", "renderType" : 'WINDOW' } canvas.launch(launchObjects_create_tickets); }
isShowLoader	Indicates whether the toast message will be displayed with a load mask or not. This parameter can have the following values: true: Enables the loader (load mask) for the toast message. false: Does not enable the loader. The load mask for the toast message indicates the time duration of the toast message.	true

If no values are provided for the API parameters mentioned in the above table, then the default values will be considered for execution.

Example:

canvas.toastMessageManager.showErrorToastMessage("Funds Transfer", "Transaction Failed.", 3000)

Figure 5: Error Toast Message - Mobile

Figure 6: Error Toast Message - Desktop

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