limiting google maps autocomplete to UK address only

I've been looking at the example on:

http://code.google.com/apis/maps/documentation/javascript/examples/places-autocomplete.html

and have decided to incorporate it into my site.

Is it possible to limit the addresses to UK addresses only?

Answers


Try this:

var input = document.getElementById('searchTextField');
var options = {
   types: ['(cities)'],
   componentRestrictions: {country: 'tr'}//Turkey only
};
var autocomplete = new google.maps.places.Autocomplete(input,options);

You can't strictly/hard limit the locations that it finds, although there is a feature request in the system to do so, but you can set a 'bias' on the results. It's passed in as an argument to the autocomplete method as a google maps bounds object. Autocomplete will then favor locations within those boundaries. Note, however, that since this isn't a hard boundary, if there are matches for the search outside the boundaries it will return those.

From my usage it seems a bit buggy and can use some improvement - especially considering that anything outside your boundary is not tagged by proximity at all, so something one block outside the boundary is just as likely to show as something 1000 miles outside, so make sure you play around with getting the boundaries working right.


You can intercept the JSONP results that are returned by the google.maps.places.Autocomplete functionality and use them as you see fit, such as to limit by country and display the results.

Basically you redefine the appendChild method on the head element, and then monitor the javascript elements that the Google autocomplete code inserts into the DOM for JSONP. As javascript elements are added, you override the JSONP callbacks that Google defines in order to get access to the raw autocomplete data.

It's a bit of a hack, here goes (I'm using jQuery but it's not necessary for this hack to work):

//The head element, where the Google Autocomplete code will insert a tag 
//for a javascript file.
var head = $('head')[0];  
//The name of the method the Autocomplete code uses to insert the tag.
var method = 'appendChild';  
//The method we will be overriding.
var originalMethod = head[method];

head[method] = function () {
  if (arguments[0] && arguments[0].src && arguments[0].src.match(/GetPredictions/)) {  //Check that the element is a javascript tag being inserted by Google.
    var callbackMatchObject = (/callback=([^&]+)&|$/).exec(arguments[0].src);  //Regex to extract the name of the callback method that the JSONP will call.
    var searchTermMatchObject = (/\?1s([^&]+)&/).exec(arguments[0].src);  //Regex to extract the search term that was entered by the user.
    var searchTerm = unescape(searchTermMatchObject[1]);
    if (callbackMatchObject && searchTermMatchObject) {
      var names = callbackMatchObject[1].split('.');  //The JSONP callback method is in the form "abc.def" and each time has a different random name.
      var originalCallback = names[0] && names[1] && window[names[0]] && window[names[0]][names[1]];  //Store the original callback method.
      if (originalCallback) {
        var newCallback = function () {  //Define your own JSONP callback
          if (arguments[0] && arguments[0][3]) {
            var data = arguments[0][4];  //Your autocomplete results
            //SUCCESS! - Limit results here and do something with them, such as displaying them in an autocomplete dropdown.
          }
        }

        //Add copy all the attributes of the old callback function to the new callback function. This prevents the autocomplete functionality from throwing an error.
        for (name in originalCallback) {  
          newCallback[name] = originalCallback[name];
        }
        window[names[0]][names[1]] = newCallback;  //Override the JSONP callback
      }
    }

  //Insert the element into the dom, regardless of whether it was being inserted by Google.
  return originalMethod.apply(this, arguments);
};

James Alday is correct:

http://code.google.com/apis/maps/documentation/javascript/places.html#places_autocomplete

var defaultBounds = new google.maps.LatLngBounds(
  new google.maps.LatLng(49.00, -13.00),
  new google.maps.LatLng(60.00, 3.00));

var acOptions = {
  bounds: defaultBounds,
  types: ['geocode']
};

it is somewhat annoying as searching for Durham gives Durham, North Carolina as the second result, regardless of how you try to persuade it to region bias - you can set it to viewport map bounds and it'll still try to suggest NC state... The jQuery solution can be found here, but doesn't seem to give as many results as the v3 API. http://code.google.com/p/geo-autocomplete/


The best way you would go about doing this, is to query the places api yourself and appending the queried string with your country. Or, of course, use the geo-autocomplete jQuery plugin.


Just change the google domain for the maps to your country domain and it will automatically search within your country only:

So: http://maps.google.com/maps/api/geocode/xml?address={0}&sensor=false&language=en

To: http://maps.google.nl/maps/api/geocode/xml?address={0}&sensor=false&language=nl


Try something like this.

// Change Bangalore, India to your cities boundary.
var bangaloreBounds = new google.maps.LatLngBounds(
    new google.maps.LatLng(12.864162, 77.438610),
    new google.maps.LatLng(13.139807, 77.711895));

var autocomplete = new google.maps.places.Autocomplete(this, {
    bounds: bangaloreBounds,
    strictBounds: true,
});

autocomplete.addListener('place_changed', function () {
});

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