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POJavascript closures with google geocoder
 

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  1. POJavascript closures with google geocoder
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    <p>i still have some problems with javascript closures, and input/output variables.</p> <p>Im playing with google maps api for a no profit project: users will place the marker into a gmap, and I have to save the locality (with coordinates) in my db.</p> <p>The problem comes when i need to do a second geocode in order to get a unique pairs of lat and lng for a location: lets say two users place the marker in the same town but in different places, I dont want to have the same locality twice in the database with differents coords.</p> <p>I know i can do the second geocode <em>after</em> the user select the locality, but i want to understand what am i mistaking here:</p> <pre><code>// First geocoding, take the marker coords to get locality. geocoder.geocode( { 'latLng': new google.maps.LatLng($("#lat").val(), $("#lng").val()), 'language': 'it' }, function(results_1, status_1){ // initialize the html var inside this closure var html = ''; if(status_1 == google.maps.GeocoderStatus.OK) { // do stuff here for(i = 0, geolen = results_1[0].address_components.length; i != geolen) { // Second type of geocoding: for each location from the first geocoding, // i want to have a unique [lat,lan] geocoder.geocode( { 'address': results_1[0].address_components[i].long_name }, function(results_2, status_2){ // Here come the problem. I need to have the long_name here, and // 'html' var should increment. coords = results_2[0].geometry.location.toUrlValue(); html += 'some html to let the user choose the locality'; } ); } // Finally, insert the 'html' variable value into my dom... //but it never gets updated! } else { alert("Error from google geocoder:" + status_1) } } ); </code></pre> <p>I tryed with:</p> <pre><code> // Second type of geocoding: for each location from the first geocoding, i want // to have a unique [lat,lan] geocoder.geocode( { 'address': results_1[0].address_components[i].long_name }, (function(results_2, status_2, long_name){ // But in this way i'll never get results_2 or status_2, well, results_2 // get long_name value, status_2 and long_name is undefined. // However, html var is correctly updated. coords = results_2[0].geometry.location.toUrlValue(); html += 'some html to let the user choose the locality'; })(results_1[0].address_components[i].long_name) ); </code></pre> <p>And with:</p> <pre><code> // Second type of geocoding: for each location from the first geocoding, i want to have // a unique [lat,lan] geocoder.geocode( { 'address': results_1[0].address_components[i].long_name }, (function(results_2, status_2, long_name){ // But i get an obvious "results_2 is not defined" error (same for status_2). coords = results_2[0].geometry.location.toUrlValue(); html += 'some html to let the user choose the locality, that can be more than one'; })(results_2, status_2, results_1[0].address_components[i].long_name) ); </code></pre> <p>Any suggestion?</p> <p><strong>EDIT:</strong></p> <p>My problem is how to pass an additional arguments to the geocoder inner function:</p> <pre><code>function(results_2, status_2, long_name){ //[...] } </code></pre> <p>becose if i do that with a clousure, I mess with the original parameters (results_2 and status_2)</p>
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    1. COFirst thing that comes to mind is to make sure the second set of callbacks are even being called by using console.log. Also, even though you are running the second set of geocodes in order, it's not guaranteed the function callbacks will run in order. If appending to the html variable worked, it could be out of order. Just something to think about.
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      1. USMatt King
    2. COYes, i removed all console.log before posting the code. Anyway, what you mean with the order issue? I know requests are asyncronous, but (i guess) the second geocode is into the first one, so it should never be executed before the first one. Am i mistaking?
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