Question

UPDATE: I have posted and accepted a fully working solution in the answers section. Any code in this section is to be used as reference for comparison to your own NON-WORKING code, but is not to be used as the solution.

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I’m building a dashboard and using d3.js to add a world map that will plot tweets in real time based on geo location.

The world.json file referenced in the d3.json() line is downloadable HERE (it’s called world-countries.json).

The map is on the page as an SVG container and is rendered using d3.

Below are the relevant code slices.

<div id="mapContainer">
    <svg xmlns="http://www.w3.org/2000/svg" width="100%" height="500"></svg>
</div>

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#mapContainer svg {
    display:block;
    margin:0 auto;
}
#mapContainer path {
  fill:#DDD;
  stroke:#FFF;
}

---

// generate US plot
function draw() {
    var map = d3.select("svg");
    var width = $("svg").parent().width();
    var height = $("svg").parent().height();

    var projection = d3.geo.equirectangular().scale(185).translate([width/2, height/2]);
    var path = d3.geo.path().projection(projection);
    d3.json('plugins/maps/world.json', function(collection) {
        map.selectAll('path').data(collection.features).enter()
            .append('path')
            .attr('d', path)
            .attr("width", width)
            .attr("height", height);
    });
}
draw();
latestLoop();

---

$(window).resize(function() {
    draw();
});

UPDATE: I have scaled the map to an acceptable size (for my particular browser size), but it still will not scale and center when I change the size of the window. IF, however, I resize the window, then hit refresh, then the map will be centered once the page is reloaded. However, since the scale is static, it is not scaled properly.

Answer 1

COMPLETE SOLUTION:

Here’s the solution which will resize the map AFTER the user has released the edge of the window to resize it, and center it in the parent container.

<div id="mapContainer"></div>

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function draw(ht) {
    $("#mapContainer").html("<svg id='map' xmlns='http://www.w3.org/2000/svg' width='100%' height='" + ht + "'></svg>");
    map = d3.select("svg");
    var width = $("svg").parent().width();
    var height = ht;

    // I discovered that the unscaled equirectangular map is 640x360. Thus, we
    // should scale our map accordingly. Depending on the width ratio of the new
    // container, the scale will be this ratio * 100. You could also use the height 
    // instead. The aspect ratio of an equirectangular map is 2:1, so that's why
    // our height is half of our width.

    projection = d3.geo.equirectangular().scale((width/640)*100).translate([width/2, height/2]);
    var path = d3.geo.path().projection(projection);
    d3.json('plugins/maps/world.json', function(collection) {
        map.selectAll('path').data(collection.features).enter()
            .append('path')
            .attr('d', path)
            .attr("width", width)
            .attr("height", width/2);
    });
}
draw($("#mapContainer").width()/2);

---

$(window).resize(function() {
    if(this.resizeTO) clearTimeout(this.resizeTO);
    this.resizeTO = setTimeout(function() {
        $(this).trigger('resizeEnd');
    }, 500);
});

$(window).bind('resizeEnd', function() {
    var height = $("#mapContainer").width()/2;
    $("#mapContainer svg").css("height", height);
    draw(height);
});