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This functionality is Sneak Peek status. This means that the APIs may change. We welcome your feedback, ideas, and code, but please use caution if you use this new functionality.


Registers a specification for resolving the invocation of a particular function name in a given context.

fluid.demands(functionName, context, demandsSpec/argsArray);

File name: FluidIoC.js


functionName (String) the name of the function demand which this specification matches.
context (String or Array of Strings) the name(s) of the context(s) in which this demand specification applies. See #Contexts below for more information.
demandsSpec/argsArray (Object)/(Array) the actual demands specification to be applied in the case this rule matches. If the functionName does not require to be replaced by another, it is sufficient just to list an Array of the replacement arguments. Otherwise, this argument can be a full #Demands Specification

Return Value




Components or functions in general may have different requirements depending on the context in which they are operating. For example, a subcomponent might operate differently when running on a production server versus when testing locally off the file system, and differently still when operating in the context of automated tests. In a more fine-grained way, a component may behave differently when operating in a browser with different capabilities, or on behalf of a user who has expressed particular needs or preferences. The context parameter to fluid.demands specifies a name for particular context in which the supplied demands are intended to be valid.

For more detailed information about contexts, see Contexts.

Demands Specification

The third parameter to fluid.demands(), spec, is the demands specification that declares how the function invocation is to be disposed, in the case that the overall block matches. This parameter can take one of several possible forms:

    funcName: "functionName",
    args: [array of arguments]
The array of arguments can contain references to any value-resolved material, as may also appear in fluid.defaults blocks


        funcName: "my.componentImpl",
        args: ["{application}.model", "{application}.options.strings"],

In this example, the component my.component is specifying its requirements when used in the context of my.application. The request is that the component be instantiated using a function called my.componentImpl, passed the args array as a parameter.

When the IoC system fulfills the demands, the model property and the options.strings property of the my.application object will be retrieved and inserted in the args array before the function is called.

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