I am a new starter, and plan to design a drop-down list which is very long, so it is impossible to list all to users and better to have a scroll bar. When users scroll down they can select the values they need and click to take a further look at.
So far I can realize the drop-down list, but do not know how to add the scroll bar to it. Could anyone give me some idea about how to move forward please?
Each value in the drop-down list I created as a text, when I click the drop-down list the full list will be shown to users, and they can then choose the required one.