Verify if XY is inside polygon

[jaykapalczynski]

Is there a way via JS or Python to simply pass an XY to a function and determine if inside or outside a polygon (from a map Service)

I need to do this for Decimal Degrees, DMS, UTM etc.

I can do it like below BUT I would have to list out EVERY node and trying to do this for a complete state

function inside(point, vs) {
    var x = point[0], y = point[1];

    var inside = false;
    for (var i = 0, j = vs.length - 1; i < vs.length; j = i++) {
        var xi = vs[i][0], yi = vs[i][1];
        var xj = vs[j][0], yj = vs[j][1];

        var intersect = ((yi > y) != (yj > y))
            && (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
        if (intersect) inside = !inside;
    }

    return inside;
};

var polygon = [[4040958.21,261090.239],[4399737.773,261090.239],  [4399737.773,1004118.285],[4040958.21,1004118.285]]                                                 

<!--// The below are two examples.  One of them is inside the other is outside to bounding box
// inside -->
test = inside([ 4147263, 646445.066 ], polygon); // true
<!-- // outside -->
<!--
test = inside([ 4537048, 694061 ], polygon); // false
 -->
alert(test);‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

[jaykapalczynski]

Total Code that is working....

ONLY THING you have to do is point to the appropriate Map Service with your single polygon.

It accepts UTM Zone 17N, UTM Zone 18N, DD, DMS, DDM, and a Map Click