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Error: error:nonassign
Error: error:nonassign
Non-Assignable Expression
Expression '{0}' used with directive '{1}' is non-assignable!
Description
This error occurs when a directive defines an isolate scope property
(using the =
mode in the scope
option of a directive definition) but the directive is used with an expression that is not-assignable.
In order for the two-way data-binding to work, it must be possible to write new values back into the path defined with the expression.
For example, given a directive:
myModule.directive('myDirective', function factory() {
return {
...
scope: {
localValue: '=bind'
}
...
}
});
Following are invalid uses of this directive:
<!-- ERROR because `1+2=localValue` is an invalid statement -->
<my-directive bind="1+2">
<!-- ERROR because `myFn()=localValue` is an invalid statement -->
<my-directive bind="myFn()">
<!-- ERROR because attribute bind wasn't provided -->
<my-directive>
To resolve this error, always use path expressions with scope properties that are two-way data-bound:
<my-directive bind="some.property">
<my-directive bind="some[3]['property']">