On a contact form, how can I auto-fill a subject line - based on the page they've just visited?

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I think you could use wix-storage for this. See documentation here .

What I’m thinking is that you put “on click” handlers on your buttons, which would put a string into storage (probably session storage for this case), identifying which page/location the user is coming from, before sending the user to the contact page:

import { session } from 'wix-storage'; 
import wixLocation from 'wix-location';

export function learnMore_click(event) {
    session.setItem("contactSubjectLine", "Whatever you want subject line to be");
    wixLocation.to("/contact");
}

Then, on your contact page, in the onReady function you can load the string from storage to see where the user came from, and use this to pre-load the subject line as appropriate:

import { session } from 'wix-storage'; 

$w.onReady(function () {
    let subjectLine = session.getItem("contactSubjectLine");
    let subjectField = $w("#subjectFieldId");
    subjectField.value = subjectLine;
});