How to bind checkboxes to google maps markers using knockout.js?
How to bind checkboxes to google maps markers using knockout.js?
1 answer
by
lottie ,
8 months ago
@adan
To bind checkboxes to Google Maps markers using Knockout.js, you can follow these steps:
- Create an HTML file with the checkboxes and Google Maps API integration:
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<!DOCTYPE html>
<html>
<head>
<title>Checkbox Google Maps Binding</title>
<style>
#map {
height: 400px;
width: 100%;
}
</style>
</head>
<body>
<h3>Choose markers to display:</h3>
<input type="checkbox" value="marker1" data-bind="checked: markersToShow"> Marker 1
<input type="checkbox" value="marker2" data-bind="checked: markersToShow"> Marker 2
<input type="checkbox" value="marker3" data-bind="checked: markersToShow"> Marker 3
<div id="map"></div>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap" async defer></script>
<script src="knockout.min.js"></script>
<script src="script.js"></script>
</body>
</html>
|
- Create a JavaScript file (e.g. script.js) that initializes the Google Map and binds checkboxes to markers using Knockout.js:
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// Hardcoded marker positions
var markers = [
{ position: {lat: 37.7749, lng: -122.4194}, title: 'Marker 1' },
{ position: {lat: 37.7749, lng: -122.4194}, title: 'Marker 2' },
{ position: {lat: 37.7749, lng: -122.4194}, title: 'Marker 3' }
];
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 12,
center: {lat: 37.7749, lng: -122.4194}
});
var viewModel = {
markersToShow: ko.observableArray([]),
markers: markers.map(function(marker) {
var googleMarker = new google.maps.Marker({
position: marker.position,
title: marker.title,
map: map
});
googleMarker.setVisible(false); // Hide marker by default
return googleMarker;
})
};
viewModel.markersToShow.subscribe(function() {
ko.utils.arrayForEach(viewModel.markers(), function(marker, index) {
if(viewModel.markersToShow().indexOf('marker' + (index + 1)) !== -1) {
marker.setVisible(true);
} else {
marker.setVisible(false);
}
});
});
ko.applyBindings(viewModel);
}
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- Include Knockout.js library in your project. You can either download it and include it in your project or use a CDN link.
- Replace YOUR_API_KEY in the Google Maps API script tag with your own API key.
- Run the HTML file in a browser and you will see checkboxes for each marker. By checking or unchecking the checkboxes, you can show or hide the corresponding markers on the Google Map.
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