Temporarily disables fields and buttons.
The disabled controls will be re-enabled when the preview ends.
Also see Disabling forms while working.
This preview disables an input[name=email] and all controls within a container matching .button-bar:
up.preview('sign-in', function(preview) {
preview.disable('input[name=email]')
preview.disable('.button-bar')
})
The element (or selector) within which fields and buttons should be disabled.
If omitted, fields and buttons within the targeted fragment will be disabled.
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