r - Shiny - 如何不选择单选按钮中的任何选项？

Question

如何不选择单选按钮中的任何选项？

从这里doc :

selected The initially selected value (if not specified then defaults to the first value)

但我不想在页面加载时选择任何内容。可能吗？

Answer 1

来自Documentation:

If you need to represent a "None selected" state, it's possible to default the radio buttons to have no options selected by using selected = character(0). However, this is not recommended, as it gives the user no way to return to that state once they've made a selection. Instead, consider having the first of your choices be c("None selected" = "").

希望这对您有所帮助。