fl_place_autocomplete_web

The web implementation of fl_place_autocomplete, built on the Places library of the Maps JavaScript API (AutocompleteSuggestion, AutocompleteSessionToken, Place.fetchFields).

This package is endorsed: depend on fl_place_autocomplete and it is included automatically.

Setup

• Use a browser key with Maps JavaScript API and Places API (New) enabled, restricted to your HTTP referrers (the key is visible in the page).
• Pass it at build time: flutter run -d chrome --dart-define=GOOGLE_PLACES_API_KEY_WEB=... (or the generic GOOGLE_PLACES_API_KEY, or --dart-define-from-file=env.json). When google.maps is not on the page, the plugin then injects Google's dynamic library import bootstrap loader into <head> once, with that key. A strict Content Security Policy must allow that inline script and https://maps.googleapis.com.
• Fallback / alternative: load the Maps JavaScript API yourself in web/index.html, inside <head>. A page-loaded API always wins; the plugin never injects a second loader.

<script>
  (g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
    key: "YOUR_API_KEY",
    v: "weekly",
  });
</script>

The plugin calls google.maps.importLibrary('places') itself. With neither a loaded API nor a key, calls fail with PlaceAutocompleteErrorCode.invalidApiKey and a message listing the options.

Platform notes

• Sessions: the Maps JavaScript API only carries a session token into place details through placePrediction.toPlace(). This package therefore keeps, per session, the token and the original prediction objects keyed by place id. fetchPlace with a session uses the cached prediction; if the place id is not cached for that session it falls back to new Place({id}) without a token, logs a warning, and that request is billed outside the session. Cached predictions are dropped when the session ends or is disposed.
• Language/region: honored for predictions. For place details they only apply outside a session (or on the fallback path), because toPlace() takes neither.
• Photos: fetchPhoto returns a URI (PhotoData.uri) for photos of places fetched in the current page.
• Place details are read from Place.toJSON().

Development

flutter test --platform chrome

The tests stub google.maps; they do not call the live API.