Update OpenAlexEdges.R

OpenAlexEdges.R

@@ -3,8 +3,20 @@ authorPubEdges <- function(keywords,pub_start_date,pub_end_date){
   keywords <- keywords
   pub_start_date <- pub_start_date
   pub_end_date <- pub_end_date
-  
-  # create search engine function
+
+
+  if(!is.character(keywords)) {
+    
+    shinyalert(
+      title = "Error!",
+      text = "You can only enter text values",
+      closeOnEsc = T,
+      closeOnClickOutside = T,
+      confirmButtonText = "OK",
+      timer = 4000
+    )
+  } else {
+    # create search engine function
   search_engine <- function(keywords,pub_start_date,pub_end_date){
     suppressPackageStartupMessages(library(openalexR))
     suppressPackageStartupMessages(library(tidyverse))
@@ -180,5 +192,5 @@ authorPubEdges <- function(keywords,pub_start_date,pub_end_date){
   
   return(author_publication_edges)
   
-  
+  } 
 }