Prompt Dialog

A prompt dialog is often used if you want the user to input a value. When a prompt dialog pops up, the user will have to click either "OK" or "Cancel" to proceed after entering an input value.
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oncancel { Function }

Description: Gets or sets a callback function to be invoked when the user clicks 'Cancel' button or closes the dialog.

Default: undefined

 alertify.prompt('a callback will be invoked on cancel.').set('oncancel', function(){ alertify.error('Cancel');} ); 


To prevent the dialog from closing, either set closeEvent.cancel = true or make your callback return false .