Binding Target
Binding target is an object affected by the binding. The binding target points to a context variable, field of a variable, context function, or context event.
In fact, the binding target is a special type of reference.
There are several supported types of binding targets:
1. Server Context Variable
context:variable
This binding target points to the value of a context variable. Since a variable is always a Data Table, the binding expression must resolve to a Data Table in order to allow bindings processor to use this table as new value of variable.
2. Field of Server Context Variable
context:variable$field
This binding target points to a specific field within a server context variable. Only value of this field in the first record of variable's Data Table will be modified by the binding.
 | Example: This binging target will modify the |
3. Context Function
context:function()
This type of target points to the function of a context. When a binding with such target is processed, that function is called. The binding expression should return a Data Table that will be used as the function input.
4. Context Event
context:event@
This target type causes the binding to fire an event of type event in context. The binding expression should return a Data Table those value will be treated as event data.
 | This binding target will have effect only if the binding is running inside Iotellect Server (e.g. in a model). If the binding is running remotely (e.g. in a widget running inside Iotellect Client), this target will generate a "local" event that will be received by the listeners inside the same Iotellect Client installation. This event will not be forwarded to the Iotellect Server and other clients. |
5. Empty Target
If binding target is empty string, the binding will just discard value returned by Expression. However, such binding may still be usable, since expression will still be evaluated and it may have useful side effects (i.e. can perform function calls that do some stuff).
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