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Showing posts from March, 2015

Underscore js easy javascript object hierarchical filtering

Hi, Just want to share something that in my opinion is really a useful helper library, and that is underscore.js When combined with knockout, you can achieve easy filtering through its helper functions. Let's say we have an object structure like this: Company A   - Boss A       - Supervisor A           - Employee A           - Employee B           - Employee C       - Supervisor B           - Employee C           - Employee D   - Boss B       - Supervisor C           - Employee A           - Employee C Company B    etc.. and after you are getting the all records, you want to provide some filtering based on the Boss, Supervisor or Employee. (to make it simple I just use dropdowns) Using underscore, I can grab the list of unique values of Boss, Supervisor and Employee like this: After that, if you are using knockout then you can bind the list to a dropdown, and using the selected value of the observable you can then create filter functions your original