Ability to make flowLines visible on map load

[facultymatt]

When using Leaflet layers you can set them to be initially visible using the visible property. For example:

rain: {
  name: 'Rain',
  type: 'xyz',
  visible: true,
  url: 'http://{s}.tile.openweathermap.org/map/rain/{z}/{x}/{y}.png',
  layerOptions: {
    attribution: 'Map data &copy; <a href="http://openweathermap.org">OpenWeatherMap</a>',
    opacity: 0.5
  }
}

It would be useful to be able to set flowLines to be visible by default in the same way, for example:

displayOptions: {
  ele: {
    visible: true,
    displayName: 'Elevation',
    weight: new L.LinearFunction([0, 3], [15.02968, 20]),
    color: colors //new L.HSLHueFunction([0, 120], [16, -30])
  }
}

this would cause the map to load with the "Elevation" flowLine visible.

[facultymatt]

I was able to achieve a similar result by using map.addLayer(dataLayer); where dataLayer is the flowLine. The following code works:

var dataLayer = new L.FlowLine(gpx, {
  recordsField: 'wpt',
  locationMode: L.LocationModes.LATLNG,
  latitudeField: 'lat',
  longitudeField: 'lon',
  legendOptions: {
    className: 'legend-line',
    numSegments: 10
  },
  displayOptions: {
    ele: {
      visible: true,
      displayName: 'Elevation',
      weight: new L.LinearFunction([0, 3], [15.02968, 20]),
      color: colors //new L.HSLHueFunction([0, 120], [16, -30])
    }
  },
  layerOptions: {
    opacity: 1.0
  }
});

var layerControl = new L.Control.Layers();
layerControl.addOverlay(dataLayer, 'Flow Line');

// set the layer visible and the box checked. Without this the 
// layer is not visible on map load
map.addLayer(dataLayer); 

layerControl.addTo(map);

[sfairgrieve]

Sorry for the delayed response. Are you referring to passing these layers in to the map constructor, or just creating layers in general? Can you provide a more complete code example of what you want to see? I see your initial code example, but it's not clear where the rain layer is being used - I'm assuming it's being passed to the map constructor.