d3.js v4 + Vue.js v2 - map + zoom + mark + drag

By Heber Almeida (http://www.heberonline.com.br) Built with blockbuilder.org

<!DOCTYPE html>

<head>
    <meta charset="utf-8">
    <script src="https://unpkg.com/vue"></script>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <style>
        body {
            margin: 0;
            position: fixed;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
        }
    </style>
</head>

<body>
    <div id="app">
        <div id="map"></div>
    </div>
    <script>
        const cities = [{ 'code': 'OTT', 'city': 'OTTAWA', 'country': 'CANADA', 'lat': '23.10', 'lon': '120.34' }, { 'code': 'BSB', 'city': 'BRASILIA', 'country': 'BRAZIL', 'lat': '-32.85', 'lon': '133.30' }, { 'code': 'DEL', 'city': 'DELHI', 'country': 'INDIA', 'lat': '4.71', 'lon': '-127.57' }, { 'code': 'CMX', 'city': 'CIDADE DO MÉXICO', 'country': 'MÉXICO', 'lat': '0.42', 'lon': '93.19' }, { 'code': 'SID', 'city': 'SIDNEY', 'country': 'AUSTRALIA', 'lat': '-48.38', 'lon': '-71.71' }, { 'code': 'TOK', 'city': 'TOQUIO', 'country': 'JAPÃO', 'lat': '17.34', 'lon': '-81.73' }, { 'code': 'CCA', 'city': 'CIDADE DO CABO', 'country': 'AFRICA DO SUL', 'lat': '-43.20', 'lon': '-171.97' }, { 'code': 'CMP', 'city': 'CAMPO GRANDE', 'country': 'BRASIL', 'lat': '-36.15', 'lon': '130.72' }, { 'code': 'PAR', 'city': 'PARIS', 'country': 'FRANÇA', 'lat': '22.19', 'lon': '174.27' }, { 'code': 'NOY', 'city': 'NOVA YORK', 'country': 'USA', 'lat': '11.23', 'lon': '112.96' }]

new Vue({
            el: '#app',
            data: {
                background: 'https://upload.wikimedia.org/wikipedia/commons/8/80/World_map_-_low_resolution.svg',
                width: 960,
                height: 600,
                start_x: null,
                start_y: null,
                projection: null,
                scale: 200,
                svg: null,
                path: null,
                g: null,
                drag_handler: null
            },
            methods: {
                createMap() {
                    this.projection = d3.geoMercator()
                        .center([0, 5])
                        .scale(this.scale)
                        .rotate([-180, 0])
                    this.svg = d3.select('#map').append('svg:svg')
                        .attr('width', this.width)
                        .attr('height', this.height)
                    this.path = d3.geoPath()
                        .projection(this.projection),
                    this.g = this.svg.append('g')
                    this.g.append('image')
                        .attr('xlink:href', this.background)
                        .append('path')
                        .attr('d', this.path)

this.request()
                },
                request() {
                    const app = this,
                        circles = this.g.selectAll('circle')
                            .data(cities)
                            .enter()
                            .append('a')
                            .attr('xlink:href', d => `https://www.google.com/search?q=${d.city}`)
                            .append('circle')
                            .attr('cx', d => this.projection([d.lon, d.lat])[0])
                            .attr('cy', d => this.projection([d.lon, d.lat])[1])
                            .attr('r', 5)
                            .style('fill', 'red')

this.drag_handler = d3.drag()
                        .on('start', this.drag_start)
                        .on('drag', (d, i, a) => this.drag_drag(d, i, a))

this.drag_handler(circles)
                },
                drag_start() {
                    this.start_x = +d3.event.x
                    this.start_y = +d3.event.y
                },
                drag_drag(d, i, a) {
                    console.log(
                        'lon x lat', this.projection.invert([d3.event.x, d3.event.y])
                    )
                    d3.select(a[i])
                        .attr('cx', d.x = d3.event.x).attr('cy', d.y = d3.event.y)
                }
            },
            mounted() {
                this.createMap()
                const zoom = d3.zoom()
                    .scaleExtent([0.1, 10]) //zoom limit
                    .on('zoom', () => {
                        this.g.style('stroke-width', `${1.5 / d3.event.transform.k}px`)
                        this.g.attr('transform', d3.event.transform) // updated for d3 v4
                    })

this.svg.call(zoom)
                    //.call(zoom.transform, d3.zoomIdentity.translate(200, 20).scale(0.25)) //initial size
                    .append('svg:g')
                    .attr('transform', 'translate(100,50) scale(.5,.5)');
            }
        })
    </script>
</body>

https://unpkg.com/vue

https://d3js.org/d3.v4.min.js