Refactor old Web Audio API to new one

Question

I'm evaluating HTML5 Web Audio API example and trying to get it work. Here is what I'm working with. As far as I got I understood that it's using old API and I need to refactor function refreshFilterType() on line ~590. Link - www.smartjava.org/examples/webaudio-filters/

According to Web Audio BiquadFilterNode I need to rework switch statement and make it and to use the new string-based values. (I.e. a value of "3" - the default lowshelf filter - needs to be passed into currentFilterType as "lowshelf"). I've tried to implement new BiquadFilterNode, but still it was unsuccessfully.

Thank you in advance.

Answer 1

I just opened a pull request with the necessary fixes. Or look at https://github.com/cwilso/smartjava.

Answer 2

...and actually, I note the real problem with the code you have is not that it's using numeric values - that's wrong, according to the spec, but it's still supported - it's line 663:

filter.type = currentFilterType;

currentFilterType is "3" - that is, the STRING "3" - and type now takes a string, so it's not being coerced. If you changed this line to

filter.type = parseInt(currentFilterType);

it would actually fix the problem (because filter.type accepts ints, and will coerce them to the appropriate string of "lowpass", etc. - but it doesn't accept the string of a number.)

However, this will fail in the long term, when we remove the deprecated types.