javascript - How do I get just the postal code from a reverse geocode result? - Stack Overflow

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I've looked all over the internet for a simple answer to this, but I can't seem to find one anywhere. I do a simple reverse geocode of a latitude and longitude and I am returned the huge results object. Where do I go from there? Here is what I have so far. Currently zipcode returns "undefined".

geocoder.geocode( {'latLng' : event.latLng}, function(results, status) {
    for(var i; i < results.length; i++){
        for(var j=0;j < results[i].address_ponents.length; j++){
            for(var k=0; k < results[i].address_ponents[j].types.length; k++){
                if(results[i].address_ponents[j].types[k] == "postal_code"){
                    var zipcode = results[i].address_ponents[j].short_name;
                }
            }
        }
    }
});

I've looked all over the internet for a simple answer to this, but I can't seem to find one anywhere. I do a simple reverse geocode of a latitude and longitude and I am returned the huge results object. Where do I go from there? Here is what I have so far. Currently zipcode returns "undefined".

geocoder.geocode( {'latLng' : event.latLng}, function(results, status) {
    for(var i; i < results.length; i++){
        for(var j=0;j < results[i].address_ponents.length; j++){
            for(var k=0; k < results[i].address_ponents[j].types.length; k++){
                if(results[i].address_ponents[j].types[k] == "postal_code"){
                    var zipcode = results[i].address_ponents[j].short_name;
                }
            }
        }
    }
});

• javascript
• jquery
• google-maps-api-3
• reverse-geocoding

Share Improve this question Follow edited Jun 7, 2012 at 6:04 mu is too short 435k7171 gold badges858858 silver badges818818 bronze badges asked Jun 7, 2012 at 5:58 ColinColin 2,48733 gold badges3434 silver badges5151 bronze badges 2

• looks as though you should have a "for(var i=0" in the beginning there. – luke_mclachlan Commented Feb 2, 2015 at 22:14
• Did you find any solution for reversing geo code in order to get postal code? – Pooya Panahandeh Commented Mar 14, 2023 at 13:06

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4 Answers 4

Sorted by: Reset to default 10

for(var i=0; i < results[0].address_ponents.length; i++)
{
    var ponent = results[0].address_ponents[i];
    if(ponent.types[0] == "postal_code")
    {
        console.log(ponent.long_name);
    }
}

This is what I got working. Basically it just does a search for postal code in the first address ponent, since that contains all the information. Remember, console.log() is your friend.

Edit many years later

Thanks to lovely ES6, supported in move browsers, this can now be done more easily let's take a look at some easier ways of doing it. First, we could simplify the loop as such

for(let ponent of results[0].address_ponents))
{
    if(ponent.types[0] == "postal_code")
    {
        console.log(ponent.long_name);
    }
}

Or we could use the find method

let postalCode = results[0].address_ponents.find(function (ponent) {
    return ponent.types[0] == "postal_code";
});
console.log(postalCode.long_name);

Found this neat function that (https://stackoverflow./users/638040/johann) posted as an answer from another stack overflow question.

It will find match the type you ask for and return it.

function extractFromAdress(ponents, type){
 for (var i=0; i<ponents.length; i++)
  for (var j=0; j<ponents[i].types.length; j++)
   if (ponents[i].types[j]==type) return ponents[i].long_name;
  return "";
}

Usage:

var postCode = extractFromAdress(results[0].address_ponents, "postal_code");
var country = extractFromAdress(results[0].address_ponents, "country");

Your issue is that the zipcode variable is a local variable to the function. I've got a working example on this jsfiddle

    var zipcode = null;
function testFunct (results, status) {
for(var i in results){
    var result = results[i];
        for(var j in result.address_ponents){
            var address_ponent = result.address_ponents[j];
            for(var k in address_ponent.types){
                var addrtype = address_ponent.types[k];
                if(addrtype  == "postal_code"){
                    zipcode = results[i].address_ponents[j].short_name;
                    console.log(zipcode);
                    return;
                }

            }
        }
    }

}

Your code does the following: If there are for instance two or three answers; it stores the last one in a row in the zipcode variable. Even if it's undefined. You should build in a check to see if the zip code is valid; and than you should return it to your zip code variable. And define the variable outside the function; otherwise it will be stuck in the function.

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