Binding Activator

A binding activator is a special reference that points to a server context variable, a server context event, or a field of a server context variable. A change of the above variable or an occurrence of the above event trigger this binding's processing.

When a binding activator is not specified, references from the binding expression work as activators. In this case, avoid using binding targets in binding expressions. Because the result of a binding expression is written to the binding target, this can cause an eternal loop of updates.

Here is a list of supported activator syntax variations:

context:variable

This activator will trigger a binding once the variable of the server context named context is changed.

Example: users.admin.devices.dev1:voltage This activator will run upon the change of the voltage property in the server-side users.admin.devices.dev1 context.

Only variables whose changes produce updated events will cause a binding to be activated.

context:event@

This activator will trigger a binding once event named event occurs in server context named context.

Example: users.admin.devices.access_control_terminal:cardRead@ This activator will run upon the occurrence of the cardRead@ event in the users.admin.devices.access_control_terminal context.

Was this page helpful?

Tell us more

Send

Thank you!