[Dropdown] Add "localsearch" Setting to allow local search when dropdown data retrieved from remote API

[enix223]

Dropdown local search only happened with local data, and dropdown with remote api will search the data by continuous invoking API with query parameter.

Since for some scenarios, we just want to retrieve the data once from the server, and search the data locally. To support this requirement, I have enhanced the dropdown module to support local search when data is retrieved from remote API.

localSearch is default to false, so it will not effect the existing features of dropdown widget. If the user needs to enable local search with remote API data, then simply set the localSearch setting to true as follow:

$modelDropdown.dropdown({
  apiSettings: {
    url: '/api/data.json'
  },
  fields: {
    name  : 'name', // displayed dropdown    
    value : 'id'         // actual dropdown value
  },
  localSearch: true,  // explicitly enable local search when needed
});

[jlukic]

I've written new docs to distinguish between modes of API dropdown usage (filter remote vs filter local)
Semantic-Org/Semantic-UI-Docs@6bfe86f

[enix223]

pretty cool.. thank you for your effort...

[jlukic]

Thank you of course 👍