Converting Google Maps styles array to Google Static Maps styles string

Question

I've built a tool that allows folks to apply a JSON map style to a Google Map, and am now wanting to add support for the Google Static Maps API.

Using the following styles array:

"[{"stylers":[]},{"featureType":"water","stylers":[{"color":"#d2dce6"}]},{"featureType":"administrative.country","elementType":"geometry","stylers":[{"weight":1},{"color":"#d5858f"}]},{"featureType":"administrative.country","elementType":"labels.text.fill","stylers":[{"color":"#555555"}]},{"featureType":"administrative","elementType":"geometry.stroke","stylers":[{"visibility":"off"}]},{"featureType":"administrative.country","stylers":[{"visibility":"on"}]},{"featureType":"road.highway","stylers":[{"saturation":-100},{"lightness":40},{"visibility":"simplified"}]},{"featureType":"road.arterial","stylers":[{"saturation":-100},{"lightness":40},{"visibility":"simplified"}]},{"featureType":"road.local","stylers":[{"saturation":-100},{"visibility":"simplified"}]},{"featureType":"landscape","elementType":"all","stylers":[{"hue":"#FFFFFF"},{"saturation":-100},{"lightness":100}]},{"featureType":"landscape.natural","elementType":"geometry","stylers":[{"saturation":-100}]},{"featureType":"landscape.man_made","elementType":"geometry.fill","stylers":[{"visibility":"simplified"},{"saturation":-100}]},{"featureType":"poi.park","elementType":"geometry","stylers":[{"saturation":-100},{"lightness":60}]},{"featureType":"poi","elementType":"geometry","stylers":[{"hue":"#FFFFFF"},{"saturation":-100},{"lightness":100},{"visibility":"off"}]}]"

(More documentation on format)

I need to ultimately convert this into a URLescaped string, in the format: style=feature:featureArgument|element:elementArgument|rule1:rule1Argument|rule2:rule2Argument (More documentation)

So far, I've written this JavaScript to try and convert things, but it isn't working properly:

  function get_static_style(styles) {
    var result = '';
    styles.forEach(function(v, i, a){
      if (v.stylers.length > 0) { // Needs to have a style rule to be valid.
        result += (v.hasOwnProperty('featureType') ? 'feature:' + v.featureType : 'feature:all') + '|';
        result += (v.hasOwnProperty('elementType') ? 'element:' + v.elementType : 'element:all') + '|';
        v.stylers.forEach(function(val, i, a){
          var propertyname = Object.keys(val)[0];
          var propertyval = new String(val[propertyname]).replace('#', '0x');
          result += propertyname + ':' + propertyval + '|';
        });
      }
    });
    console.log(result);
    return encodeURIComponent(result);
  }

Alas, this code is outputting the following:

(Right-click and select "copy URL" to see the full path I'm using -- the above is direct from the static images API)

...When instead it should look like this:

Any ideas? Thanks!

Answer 1

Each single style must be supplied with a separate style-parameter:

 function get_static_style(styles) {
    var result = [];
    styles.forEach(function(v, i, a){
      var style='';
      if (v.stylers.length > 0) { // Needs to have a style rule to be valid.
        style += (v.hasOwnProperty('featureType') ? 'feature:' + v.featureType : 'feature:all') + '|';
        style += (v.hasOwnProperty('elementType') ? 'element:' + v.elementType : 'element:all') + '|';
        v.stylers.forEach(function(val, i, a){
          var propertyname = Object.keys(val)[0];
          var propertyval = val[propertyname].toString().replace('#', '0x');
          style += propertyname + ':' + propertyval + '|';
        });
      }
      result.push('style='+encodeURIComponent(style))
    });

    return result.join('&');
  }

---

watch the result

Answer 2

The selected answer didn't work for me.
But only because I had a few objects without styler parameters.
I had to modify it like so:

function get_static_style(styles) {
    var result = [];
    styles.forEach(function(v, i, a){

        var style='';
        if( v.stylers ) { // only if there is a styler object
            if (v.stylers.length > 0) { // Needs to have a style rule to be valid.
                style += (v.hasOwnProperty('featureType') ? 'feature:' + v.featureType : 'feature:all') + '|';
                style += (v.hasOwnProperty('elementType') ? 'element:' + v.elementType : 'element:all') + '|';
                v.stylers.forEach(function(val, i, a){
                    var propertyname = Object.keys(val)[0];
                    var propertyval = val[propertyname].toString().replace('#', '0x');
                    // changed "new String()" based on: http://stackoverflow.com/a/5821991/1121532

                    style += propertyname + ':' + propertyval + '|';
                });
            }
        }
        result.push('style='+encodeURIComponent(style));
    });

    return result.join('&');
}

see it in action at: http://jsfiddle.net/ZnGpb/1/

p.s: JSHint