FLUID-6132: Cannot bind to DOM binder methods via IoC

Description

As a result of various implementational drifts and "cute" implementational choices, it is not possible to bind to the DOM binder's function's via IoC references. For example, a reference of the form {that}.hostComponent.dom.fastLocate does not resolve to the DOM binder's fastLocate method, but foolishly returns a zero-element jQuery.

This is the result of two architectural trainwrecks co-occurring - firstly, the implementation for https://issues.fluidproject.org/browse/FLUID-5821 fixed the contract in this case in the wrong way. In fact, asking for a selector which has not been configured at all should return no kind of jQuery but simply undefined.

Secondly, we "cutely" subvert the IoC resolution machinery to allow expressions of the kind {that}.dom.selectorName to resolve onto the fetched jQuery. Unfortunately the "fallback" mechanism, implemented via the resolvePathSegment hack at https://github.com/fluid-project/infusion/blob/master/src/framework/core/js/FluidView.js#L212 could only proceed to try concrete resolution in the case the return value is undefined. The faulty return of the zero-element jQuery would block the search for a further scheme for value resolution. Unfortunately, as the final element of the wreck, the "fallback" resolution within fluid.get which used to appear at https://github.com/fluid-project/infusion/blob/master/src/framework/core/js/Fluid.js#L968 has been removed. The mere presence of a resolvePathSegment method will block resolution of a concrete member.

The cleanest way out of this difficulty would be to move the "real" DOM binder to an unrelated path, e.g. at {that}.domBinder, and then leave {that}.dom as a plain {} with simply the resolvePathSegment method.

Comments

• Cindy Li commented 2017-02-21T15:04:33.995-0500

  The pull request https://github.com/fluid-project/infusion/pull/814 has been merged into the project repo master branch at 095ff9ff2dd760b145f2551b3229046ee0513e36