The map fails to fully display when using d3.js

Currently, I am developing a globe where multiple locations are marked with small circles. These locations provide relevant information through tooltips when the cursor hovers over them.

The issue I am facing is that the global map often renders incomplete. Some countries do not appear, affecting the behavior of my code significantly. Interestingly, every 5th time I refresh the browser, the map does render completely. I suspect there might be a gap in my code or a syntax problem in the JSON file causing confusion for the browser.

For reference, this problem persists across FF, Safari, and Chrome while utilizing D3.js version 3.

Below is the rendering code snippet:

d3.json("d/world-countries.json", function (error, collection) {
    map.selectAll("path")
        .data(collection.features)
        .enter()
        .append("svg:path")
        .attr("class", "country")
        .attr("d", path)
        .append("svg:title")
        .text(function(d) { 
            return d.properties.name; });
});
track = "countries";
d3.json("d/quakes.json", function (error, collection) {
    map.selectAll("quakes")
        .data(collection.features)
        .enter()
        .append("svg:path")       
        .attr("r", function(d) {
            return impactSize(d.properties.mag);
        })
        .attr("cx", function(d) {
            return projection(d.geometry.coordinates)[0];
        })
        .attr("cy", function(d) {
            return projection(d.geometry.coordinates)[1];
        })
        .attr("class", "quake") 
        .on("mouseover", nodehi)
        .on("mouseout", nodelo) 
        .attr("d", path)
        .append("svg:title")
        .text(function(d) {
            var tip = d.properties.description + " long "+ (d.geometry.coordinates)[0] + " lat " + (d.geometry.coordinates)[1];
            return tip;
        });
});

Your insights on resolving this issue would be highly valued...

Answer №1

The reason for the unexpected behavior you're witnessing is due to the non-independent nature of two asynchronous calls made using d3.json. When selecting elements and binding data to them, the order in which these calls complete determines whether you observe correct or incorrect results.

Both handler functions append path elements. If one call finishes before the other, existing path elements may cause mismatch with the data passed to .data(), resulting in missing expected elements within the .enter() selection. However, this issue can be resolved by applying specific classes to paths and adjusting selectors accordingly.

An alternative approach is to nest the d3.json calls so that the second call waits for the completion of the first. Implementing both solutions ensures accurate element rendering, although simultaneous execution might still be preferred for performance reasons.

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