Hello, I have a form that asks users to enter coordinates in Gauss Kruger Zone 7 and then converts them to Lat Long to calculate the geopoint question before saving to the database.
I am using a custom javascript function to transform from Gauss Kruger to Lat Long, and as it uses the proj4 library, I have used webpack to compile a single .js file that i put into the scripts folder (like this https://github.com/EsriPS/survey123-webpack)
This works perfectly in Survey123 connect but not in the web app. When i open the form in the web app and enter the gauss kruger coordinates the lat and long fields don't calculate, they remain empty.
I have checked the known limitations of javascript in survey123 but cant find one related to this error, but was wondering if i missed something.
Does anyone know why it would work in connect and not in the web app? Or have any ideas of what i could do to get it to work?
I am using v3.19 of Connect, below is the jvascript i am using to convert the coordinates
Thanks!
import proj4 from 'proj4';
export function getCoordinateFromOther(easting,northing,value) {
//check for empty/incorrect easting/northing values and return error
if (isNaN(easting) || isNaN(northing)) {
return 'Please provide numbers for x or y';
}
if (!isFinite(easting) || !isFinite(northing)) {
return 'Please provide finite numbers for x or y';
}
var gk7 = "+proj=tmerc +lat_0=0 +lon_0=21 +k=0.9999 +x_0=7500000 +y_0=0 +ellps=bessel +towgs84=682,-203,480,0,0,0,0 +units=m +no_defs +type=crs";
var wgs84 = "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs";
let coordinate = proj4(gk7,wgs84,[easting,northing]);
//subset coordinates and return requested value - either latitude or longitude
if(value === 'Latitude') {
return coordinate[1]
}
if(value === 'Longitude') {
return coordinate[0]
}
}
