The ng:eval allows you to execute a binding which has side effects
without displaying the result to the user.
Usage
In HTML Template Binding
<ANY ng:eval="expression">
...
</ANY>
Parameters
expression –
{expression}
– to eval.
Example
Notice that {{obj.multiplied = obj.a * obj.b}} has a side effect of assigning
a value to obj.multiplied and displaying the result to the user. Sometimes,
however, it is desirable to execute a side effect without showing the value to
the user. In such a case ng:eval allows you to execute code without updating
the display.