SelectInput Function Selected Value

shiny
,
1

I am
I am using selected = NULL in the selectInput function below to prevent the first item in the list to appear as default selection in the dropdown menu. I would like for this value to be blank instead, but it does not work.
Any ideas?

              c("mpg" = "mpg",
                "Cylinders" = "cyl",
                "Displacement" = "disp",
                "HorsePower"  = "hp",
                "Drat" = "drat",
                "Weight" = "wt",
                "Qsec" = "qsec",
                "Vs" = "vs",
                "Transmission" = "am",
                "Gears" = "gear",
                "Carb" = "carb"
                ), selected = NULL)
2

You need to add "" as the first entry in choices.

Example here:

https://shinylive.io/r/editor/#code=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-n0qjDCQBEoQGlC6QKgASKOcd1BdNRiBJQUi9hV7m0GVKXP+QJ11qlO6OZ5bIGVoNKKOkeSMCCbAByRAh0tH3jgRlj3IAvkpPKMeyD54vl1pOORNgBNQslto72bXPOkEclbPl9lWfdpfeyH+cgQDwfCsAAgug7CKJSyaprIYD7gAukAA

It's described in the Details section of the docs: Create a select list input control — selectInput