Display different text with different dropdown menu options?

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Hi -- I am brand, brand new to coding so please bear with me. I want to create a drop down menu with options that, when selected, display different lines of text. Specifically, I want to have a drop down menu of book titles, pick one and a different recommended book title is displayed.
I know how to get the selected option to display with JavaScript but I want to display something totally different.
I really appreciate any help -- even just a point in the right direction. thank you!!
Kristin

What I have tried:

--select book--
sample title
another title

function ddselect()
(
var d=document.getElementByID("ddselect")
var displaytext=d.options [d.selectedIndex}.text;
document.getElementByID ("txtvalue").value=displaytext;

Posted 25-Jul-21 9:10am

Kristin Peace

Updated 25-Jul-21 23:06pm

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Chris Copeland · Answer 1 · 2021-07-25T23:06:00

One way you could achieve this is to use the data- attributes which can be applied to elements. Using JS you can select the data attribute values to get additional content for each option: JSFiddle Example[^]

If you need to supply more complex information then you'll probably need to store an array of objects in the JS code and use the selectedIndex to get the correct object. Something akin to:

JavaScript

const data = [
  {},
  { extra: 'I am extra data' },
  { extra: 'I am also extra data' }
];

..
const index = d.selectedIndex;
const extra = data[index];

console.log(extra.extra);