add support for text symbols about esri-leaflet-renderers

[jgravois]

from https://github.com/Esri/esri-leaflet-renderers/blob/master/README.md#limitations

Text symbols are not supported.

[mepdr]

I'd use text symbols for both Points and LineString, is there any plan to support them?

[pmacMaps]

@mepdr Not sure what your end goal is, but if I want to have labels for my layers, I will do one of two things. Not sure if they would work for you:

1. Publish layer as a map service with labels enabled.
2. Publish a service without labels (feature or map service), and then publish a map service with the labels, but the symbols turned off.

When using a map service, the labels will redraw dynamically as the map extent changes.

[jgravois]

@mepdr no one is working on introducing support for text symbols at the moment, but pull requests are welcome.

@pmacMaps thanks for outlining a few relevant alternative workflows. they're both totally relevant.

[mepdr]

Thanks for answers.
@pmacMaps I've a layer exposed as MapServer but I'm unable to use tiles, not sure why. The arcgis javascript example works though.
@jgravois how difficult will be to introduce such support? Would you share few advises where/how to start

[jgravois]

@mepdr even if a map service has not been cached and no tiles exist to be served out it is still possible to draw the associated layers in esri-leaflet using L.esri.dynamicMapLayer. this is a technique which will allow you to 'turn on' labels for the individual layer without writing any code of your own.

example:
http://jsbin.com/yoluvi/1/edit?html,output