This can be done quite easily.
You can look at this component’s code and adapt it to hide elements with CSS (target .similar-topics
) in users’ preferences settings. That’s exactly what I’ve done on https://unicyclist.com/, where users have a setting to hide the donation icon in the top right of the header.
Basically, the only change I made to the original plugin is that I store the setting in a cookie (I want to remind my user to donate each year for the servers’ fees).
Here’s my own theme component code:
<script type="text/discourse-plugin" version="0.8">
// set the cookie duration to 1 year
function setHideDonationCookie(value=null) {
var now = new Date();
var time = now.getTime();
var expireTime = time + 1000*60*60*24*365;
now.setTime(expireTime);
document.cookie = 'donationButton=' + value + ';expires='+now.toUTCString()+';path=/';
}
// return the cookie value
function getCookie(name) {
var dc = document.cookie;
var prefix = name + "=";
var begin = dc.indexOf("; " + prefix);
if (begin == -1) {
begin = dc.indexOf(prefix);
if (begin != 0) return null;
}
else
{
begin += 2;
var end = document.cookie.indexOf(";", begin);
if (end == -1) {
end = dc.length;
}
}
return decodeURI(dc.substring(begin + prefix.length, end));
}
function getToggleDonationIcon() {
let pref = getCookie('donationButton');
let result = settings.default_enabled;
if (pref !== null) {
result = pref === "true";
}
return result;
}
// We add the CSS rule in the HTML code
if (getToggleDonationIcon()) {
let style = document.createElement('style');
style.innerHTML = ".header-icon-help-fund-servers-fees{ display: none; }";
document.head.appendChild(style);
}
// technically we only want to amend current user here
api.modifyClass("model:user", {
toggleDonationIcon: function() {
return getToggleDonationIcon();
}.property()
});
api.modifyClass("controller:preferences/interface", {
actions: {
save() {
this._super();
// set the cookie value as the setting value
if(this.get("model.toggleDonationIcon") != getToggleDonationIcon()) {
setHideDonationCookie(this.get("model.toggleDonationIcon").toString());
if(this.get("model.toggleDonationIcon") == false) {
document.getElementsByClassName("header-icon-help-fund-servers-fees")[0].style.display = "";
}
else {
document.getElementsByClassName("header-icon-help-fund-servers-fees")[0].style.display = "none";
}
}
}
}
});
</script>
<script type='text/x-handlebars' data-template-name='/connectors/user-preferences-interface/add-selector'>
{{preference-checkbox labelKey=(theme-prefix 'donation_icon_toggle') checked=model.toggleDonationIcon}}
</script>