How to make heatmap clickable? - heatmap

Question

I have attached my code below which I have been using to try and generate a clickable heatmap. The actual heatmap is generated but I cannot produce a click event.
Here is my code:
const centerLocation = new google.maps.LatLng(
Number(28.555040),
Number(77.241920)
);
const mapProp = {
center: centerLocation,
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP,
clickableIcons: true
};
this.map = new google.maps.Map(this.gmapElement.nativeElement, mapProp);
const location = new google.maps.LatLng(
Number(28.555040),
Number(77.241920)
);
for (let i = 0; i < userData.length; i++) {
this.marker = new google.maps.Marker({
position: new google.maps.LatLng(+userData[i][1], +userData[i][2]),
map: this.map,
icon: this.userimage,
title: userData[i][0]
});
// tslint:disable-next-line:no-shadowed-variable
google.maps.event.addListener(this.marker, 'click', (function (marker, i) {
return function () {
infowindow.setContent('' + userData[i][0] + '');
infowindow.open(this.map, this);
};
})(this.marker, i));
}
const infowindow = new google.maps.InfoWindow();
for (let i = 0; i < eventData.length; i++) {
this.marker = new google.maps.Marker({
position: new google.maps.LatLng(+eventData[i][1], +eventData[i][2]),
map: this.map,
icon: this.image,
title: eventData[i][0]
});
// tslint:disable-next-line:no-shadowed-variable
google.maps.event.addListener(this.marker, 'click', (function (marker, i) {
return function () {
infowindow.setContent('' + eventData[i][0] + '');
infowindow.open(this.map, this);
};
})(this.marker, i));
}
// console.warn(location);
this.marker.setPosition(location);
this.heatmap = new google.maps.visualization.HeatmapLayer({
data: heatmapData,
dissipating: true,
radius: 50
});
this.heatmap.setMap(this.map);
// For heatmap color
const gradient = [
'rgba(0, 255, 255, 0)',
'rgba(0, 255, 255, 1)',
'rgba(0, 191, 255, 1)',
'rgba(0, 127, 255, 1)',
'rgba(0, 63, 255, 1)',
'rgba(0, 0, 255, 1)',
'rgba(0, 0, 223, 1)',
'rgba(0, 0, 191, 1)',
'rgba(0, 0, 159, 1)',
'rgba(0, 0, 127, 1)',
'rgba(63, 0, 91, 1)',
'rgba(127, 0, 63, 1)',
'rgba(191, 0, 31, 1)',
'rgba(255, 0, 0, 1)'
];
this.heatmap.set('gradient', gradient);
// For heatmap color
this.heatmap.set('opacity', 0.6);

Answer 1

If by 'clickable' you mean interactive you may want to look at complexheatmaps which offer that specific utility. The supporting documentation can be found here. An example of what level of interactivity is possible can be found on this page.
Use one of the following to download the package...
Most Recent (you must use force = TRUE):
library(devtools)
install_github("jokergoo/ComplexHeatmap", force = TRUE)
library(ComplexHeatmap)
Stable:
if (!requireNamespace("BiocManager", quietly = TRUE))
install.packages("BiocManager")
BiocManager::install("ComplexHeatmap", version = "3.8")
Alternatively, you may want to look at using iheatmapr, though I know very little about it. As it is designed with interactivity as a forethough it may be of use to you. Here is how it was described in the Journal of Open Source Software.
There are great tools in R for creating simple interactive heatmaps
(Galili 2016, Cheng and Galili (2016)) or creating static complex
heatmaps (Gu, Eils, and Schlesner 2016). However, there are no tools
facilitating the creation of complex, interactive heatmaps.
Theiheatmapr package fills this gap, enabling the creation of highly
customizable, interactive, complex heatmaps using the plot library
(Sievert et al. 2016). The resulting interactive visualizations can
easily be incorporated into reproducible R Markdown reports for sharing
with collaborators