How can I pull a URL stored inside a Mapbox dataset and add it to a 'click' function on a popup? - mapbox

Question

I have a function code that pulls data from the "description" field and displays it inside a popup on mouseenter, but can someone help me figure out how to pull in the URL stored inside "linkurl" and use it to open that URL when the icon is clicked? The popup displays properly over an icon, but I can't figure out how to bring the URL in as a link on click. Here's the code I'm working with:
map.on('load', function() {
// Create a popup, but don't add it to the map yet.
var popup = new mapboxgl.Popup({
closeButton: false,
closeOnClick: false
});
// POINTS OF INTEREST
function showPopup(e) {
// Updates the cursor to a hand (interactivity)
map.getCanvas().style.cursor = 'pointer';
// Show the popup at the coordinates with some data
popup
.setLngLat(e.features[0].geometry.coordinates)
.setHTML(checkEmpty(e.features[0].properties.description))
.addTo(map);
}
function hidePopup() {
map.getCanvas().style.cursor = '';
popup.remove();
}
function checkEmpty(info) {
return (info) ? info : "No data";
}
// CHANGE: Add layer names that need to be interactive
map.on('mouseenter', 'points-of-interest-2019', showPopup);
map.on('mouseleave', 'points-of-interest-2019', hidePopup);
});

Answer 1

To add a link within the Popup itself, you can use Popup#setHTML in conjunction with the <a> tag define a hyperlink. For example:
// Show the popup at the coordinates with some data
var properties = e.features[0].properties;
popup
.setLngLat(e.features[0].geometry.coordinates)
.setHTML(
'<a href=\'' + properties.linkurl + '\'>'
+ checkEmpty(properties.description)
+ '</a>')
.addTo(map);
Since creating a Popup with the GL JS API automatically creates a DOM element as outlined in the source code here, there is currently not a way to make the entire Popup clickable to navigate to a particular link. You could instead use Popup#setHTML along with some minimal CSS to create a link which wraps the entire content added to the Popup, so that clicking the content of the Popup will open the link.
Alternatively, if you are using Marker instances and would like clicking on the marker itself to open a link, you could utilize the options.element parameter to specify a DOM element wrapped in a link to use as a marker. For example, consider a slight modification to this example:
var el = document.createElement('a');
el.href = 'https://www.mapbox.com/'
el.className = 'marker';
el.style.backgroundImage =
'url(https://placekitten.com/g/' +
marker.properties.iconSize.join('/') +
'/)';
el.style.width = marker.properties.iconSize[0] + 'px';
el.style.height = marker.properties.iconSize[1] + 'px';
// add marker to map
new mapboxgl.Marker(el)
.setLngLat(marker.geometry.coordinates)
.addTo(map);