I've made a pretty sizable script that will detect what geographic zone a user is in using the browser geolocation feature, then change the background image and fade it in on the header.
Right now its a series of conditional if/else if statements. Works great, but just that code is starting to look fairly big.
<script type = "text/javascript" >
var geoHeader = document.getElementById("geozones");
function locate() {
if (navigator.geolocation) {
console.log('getting geolocation information...');
navigator.geolocation.getCurrentPosition(function (position) {
// Determine if in brisbane
if (position.coords.latitude >= -27.936539 && position.coords.latitude <= -26.772950 && position.coords.longitude >= 152.439692 && position.coords.longitude <= 153.543818) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0004/315409/gelocation-selection-Enlisting-depot-in-Brisbane-during-World-War-I.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Brisbane');
//Determine if in Barcaldine
} else if (position.coords.latitude >= -23.741146 && position.coords.latitude <= -23.450440 && position.coords.longitude >= 145.117460 && position.coords.longitude <= 145.484472) {
geoHeader.style.backgroundImage = 'url(http://i1167.photobucket.com/albums/q640/coolwebs/barcaldine-pub_zpsf8oazwr8.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Barcaldine');
//Determine if in Beerburrum boundaries
} else if (position.coords.latitude >= -26.998834 && position.coords.latitude <= -26.892941 && position.coords.longitude >= 143.313919 && position.coords.longitude <= 153.01622) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0016/315421/gelocation-selection-View-of-Beerburrum-showing-the-hospital-building-on-the-hill-and-houses-in-the-street-ca-1921.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Beerburrum');
//Determine if in Biggenden boundaries
} else if (position.coords.latitude >= -25.743886 && position.coords.latitude <= -25.173518 && position.coords.longitude >= 151.750732 && position.coords.longitude <= 152.365966) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0017/315422/gelocation-selection-Woman-seated-in-a-Red-Cross-ambulance-Biggenden-19141918.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Biggenden');
//Find out Charleville boundaries
} else if (position.coords.latitude >= -26.735435 && position.coords.latitude <= -25.982371 && position.coords.longitude >= 145.503569 && position.coords.longitude <= 146.679106) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0004/315418/gelocation-selection-Red-Cross-workers-Charleville-1914.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
console.log('You might be in Barcaldine');
//Determine if in Chinchilla boundaries
} else if (position.coords.latitude >= -27.016575 && position.coords.latitude <= -26.504023 && position.coords.longitude >= 150.383621 && position.coords.longitude <= 150.913711) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0005/315419/gelocation-selection-Returned-soldiers-in-uniform-surrounding-the-Digger-War-Memorial-in-Chinchilla-ca.-1920.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Chinchilla');
//Determine if in Cairns boundaries
} else if (position.coords.latitude >= -17.216314 && position.coords.latitude <= -16.619826 && position.coords.longitude >= 145.477123 && position.coords.longitude <= 146.013393) {
geoHeader.style.backgroundImage = 'url(http://i1167.photobucket.com/albums/q640/coolwebs/forms%20radio%20images/rex-lookout_zpsgnn4j1xx.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
console.log('You might be in Cairns');
//Determine if in Lockyer Valley (Gatton and Helidon) boundaries
} else if (position.coords.latitude >= -27.774956 && position.coords.latitude <= 27.422018 && position.coords.longitude >= 152.03981 && position.coords.longitude <= 152.495742) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0014/315410/gelocation-selection-Gatton-Mens-Auzzillary.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Lockyer Valley');
//Determine if in Rockhampton
} else if (position.coords.latitude >= -23.86413 && position.coords.latitude <= -22.348442 && position.coords.longitude >= 149.443603 && position.coords.longitude <= 150.783935) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0018/315414/gelocation-selection-March-to-Freedom-Column-at-Rockhampton-Queensland.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Rockhampton');
//Determine if in Sunshine Coast (Buderim and Maleny) boundaries
} else if (position.coords.latitude >= -26.862318 && position.coords.latitude <= -26.312145 && position.coords.longitude >= 152.807479 && position.coords.longitude <= 153.172775) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0020/315416/gelocation-selection-Parade-in-Maleny-ca.-1915.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Sunshine Coast');
//Determine if in Thargomindah boundaries
} else if (position.coords.latitude >= -28.378369 && position.coords.latitude <= -27.529237 && position.coords.longitude >= 143.313919 && position.coords.longitude <= 144.478469) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0015/315420/gelocation-selection-Selling-flowers-to-raise-funds-for-the-Red-Cross-Thargomindah-ca.-1916.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Thargomindah');
//Determine if in Toogoolawah (in the Brisbane Valley) boundaries
} else if (position.coords.latitude >= -27.402512 && position.coords.latitude <= -26.91376 && position.coords.longitude >= 152.210098 && position.coords.longitude <= 152.715469) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0003/315417/gelocation-selection-Peace-celebrations-in-Toogoolawah-1918.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Toogoolawah');
//Determine if in Townsville boundaries
} else if (position.coords.latitude >= -20.116181 && position.coords.latitude <= -18.363276 && position.coords.longitude >= 144.093261 && position.coords.longitude <= 147.619873) {
geoHeader.style.backgroundImage = 'url(http://testing.slq.qld.gov.au/__data/assets/image/0019/315415/gelocation-selection-Members-of-the-Mens-Auxiliary-at-Townsville-Queensland.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('You might be in Townsville');
} else {
geoHeader.style.backgroundImage = 'url(http://i415.photobucket.com/albums/pp236/Keefers_/Keffers%20Animals/evilmonkey.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('We dunno where you are... evil monkey is watching you');
}
}, function () {
geoHeader.style.opacity = '1';
geoHeader.style.backgroundImage = 'url(http://i636.photobucket.com/albums/uu82/fireduptiger/Enchanted%20Forest/untitled.jpg)';
geoHeader.className = geoHeader.className + " fadeHeader";
geoHeader.style.opacity = '1';
console.log('Too bad you are denying us your location. We are lost in the woods...');
});
} else {
console.log('error message. Geolocation failed. Probably lacking browser support' + error.code);
}
};
locate();
</script>
To make the script smaller, I am thinking of running it through a loop script and using a series of arrays to hold the data and loop through it. I'm just concerned that it gets a bit tricky when the large amount of geolocation data is evaluated - everything else is straightforward enough.
I'd be keen to here any suggestions.
You may store all your headers in an object, including:
Something like this:
var headers = {
regional : [
{
desc : "Brisbane",
minLat : -27.936539,
maxLat : -26.772950,
minLong : 152.439692,
maxLong : 153.543818,
image : 'http://testing.slq.qld.gov.au/__data/assets/image/0004/315409/gelocation-selection-Enlisting-depot-in-Brisbane-during-World-War-I.jpg'
}, {
desc : "Barcaldine",
minLat : -23.741146,
maxLat : -23.450440,
minLong : 145.117460,
maxLong : 145.484472,
image : 'http://i1167.photobucket.com/albums/q640/coolwebs/barcaldine-pub_zpsf8oazwr8.jpg'
}
],
def : 'http://testing.slq.qld.gov.au/__data/assets/image/0004/315409/gelocation-selection-Enlisting-depot-in-Brisbane-during-World-War-I.jpg',
disabled : 'http://i636.photobucket.com/albums/uu82/fireduptiger/Enchanted%20Forest/untitled.jpg'
};
And write a function which will walk through the array looking for a specific region, or return default one if not found:
function getHeaderForCoordinates(lat, lng) {
for (var i = 0; i < headers.regional.length; i++)
{
var header = headers.regional[i];
if (lat >= header.minLat && lat <= header.maxLat
&& lng >= header.minLong && lng <= header.maxLong)
{
console.log("User is from " + header.desc);
return header.image;
}
}
console.log("User has geolocation, but region is unknown");
return headers.def;
}
Then, you will be able to use it in code this way:
function wrapWithUrl(url) { // just an utility function
return "url('" + url + "')";
}
navigator.geolocation.getCurrentPosition(function (position) {
var url = getHeaderForCoordinates(position.coords.latitude, position.coords.longitude);
getHeader.style.backgroundImage = wrapWithUrl(url);
}, function () {
geoHeader.style.backgroundImage = wrapWithUrl(headers.disabled);
});