no error when character vector is used for source or target in sankeyNetwork

Hi Chris, nice package in networkD3. I have been working with some data today, trying to show a path of material through a manufacturing process. I am trying to use the sankeyNetwork command and I am not getting any errors in my script, but there is no output appearing. I ran the Energy test sample on the net for networkD3 and that shows up file, so doubtful a java / HTML problem.

A couple of key differences in what I pass to the function:

1. I pass 2 data frames directly to the sankeyNetwork function, they are not part of a list - didn't think this would be a problem

2. The Source and Target field of the links table are the character names (chr) of the nodes and not the node indexes (num) that appears in the Energy sample as mentioned. I imagine this maybe the problem, but can you confirm? I would like to use node names rather than indexes in the function call to save me substituting nodenames for the indexes of the nodes?

There may be something else, but if you could point me in the right direction, that would be great. I have put sessionInfo, str and the sankeyNetwork command below.

Many thanks for your help,

Dave.
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> sessionInfo()
R version 3.3.3 (2017-03-06)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C LC_TIME=English_United States.1252

attached base packages:
[1] grid stats graphics grDevices utils datasets methods base

other attached packages:
[1] lubridate_1.6.0 networkD3_0.3 arulesViz_1.2-1 arules_1.5-2 Matrix_1.2-8 uuid_0.1-2
[7] RODBC_1.3-14 data.table_1.10.4 timeDate_3012.100 dplyr_0.5.0 plyr_1.8.4 RevoUtilsMath_10.0.0

loaded via a namespace (and not attached):
[1] mclust_5.2.2 Rcpp_0.12.9 vcd_1.4-3 mvtnorm_1.0-6 lattice_0.20-34 tidyr_0.6.1
[7] class_7.3-14 zoo_1.7-14 gtools_3.5.0 assertthat_0.1 digest_0.6.12 lmtest_0.9-35
[13] foreach_1.4.3 R6_2.2.0 stats4_3.3.3 httr_1.2.1 ggplot2_2.2.1 gplots_3.0.1
[19] curl_2.3 lazyeval_0.2.0 diptest_0.75-7 gdata_2.17.0 whisker_0.3-2 kernlab_0.9-25
[25] DT_0.2 RevoUtils_10.0.3 stringr_1.2.0 htmlwidgets_0.8 igraph_1.0.1 munsell_0.4.3
[31] base64enc_0.1-3 htmltools_0.3.5 nnet_7.3-12 tibble_1.2 gridExtra_2.2.1 seriation_1.2-1
[37] codetools_0.2-15 dendextend_1.4.0 viridisLite_0.1.3 MASS_7.3-45 bitops_1.0-6 jsonlite_1.3
[43] gtable_0.2.0 registry_0.3 DBI_0.6 magrittr_1.5 scales_0.4.1 KernSmooth_2.23-15
[49] stringi_1.1.2 viridis_0.3.4 scatterplot3d_0.3-38 flexmix_2.3-13 robustbase_0.92-7 iterators_1.0.8
[55] tools_3.3.3 fpc_2.1-10 trimcluster_0.1-2 DEoptimR_1.0-8 purrr_0.2.2 gclus_1.3.1
[61] yaml_2.1.14 colorspace_1.3-2 cluster_2.0.5 caTools_1.17.1 prabclus_2.2-6 TSP_1.1-5
[67] plotly_4.5.6 modeltools_0.2-21

> str(WorkStation_Nodes)
'data.frame': 26 obs. of 1 variable:
$ WorkStation: chr "CT-PS Tray Loading-SL10 PS" "CT-Insert Moulding SL10" "CT-Laser Marking-SL10" "CT-Coating Prep-SL10" ...

> str(FinalLinksforSankey)
'data.frame': 137 obs. of 3 variables:
$ workstation_scr : chr "CT-PS Tray Loading-SL10 PS" "CT-Insert Moulding SL10" "CT-Laser Marking-SL10" "CT-Coating Prep-SL10" ...
$ workstation_dest: chr "CT-Insert Moulding SL10" "CT-Laser Marking-SL10" "CT-Coating Prep-SL10" "CT-Hydrophillic Coating-SL10" ...
$ lot_number : chr "19804987" "19804987" "19804987" "19804987" ...

> sankeyNetwork(Links = FinalLinksforSankey, Nodes = WorkStation_Nodes, Source = "workstation_scr",
+ Target = "workstation_dest", Value = "lot_number", NodeID = "WorkStation",
+ units = "Lots", fontSize = 12, nodeWidth = 30)
>