How to address hover problems in D3.js when dealing with Path elements and updating tooltip information after brushing the focus

Seeking assistance with a Multi Series, Focus + Context D3 chart and hoping to address my main queries all at once.

The questions that need resolving are:

  1. How can I prevent the tooltips I've generated from being affected by the hair-line (which tracks the mouse) of the chart i.e. not disappear but stay visible until the mouse is moved? They should persist as if the hair-line wasn't there or had a different setup.

  2. Data paths seem to be overflowing to the left of the chart instead of being confined within the focus area. How can this issue be fixed? It seems related to the left margin.

  3. When brushing the data, the focus chart updates through the context, but I'm having trouble updating the tooltip content. Can anyone pinpoint what's wrong with the current code?

CSS Styles:

        body {
          font: 10px sans-serif;
        }

        .axis path,
        .axis path_steelblue {
            fill: none;
            stroke: #000;
            shape-rendering: geometricPrecision;
        }
        
        // Other CSS styles remain unchanged for brevity...

D3 Code:

// Rest of D3 code remains untouched..
    // Hover line. 
        var hoverLineGroup = focus.append("g") //svg.append("g") -- Ensures hairline follows mouse pointer put interferes with the tooltip not allowing it to persist until the mouse moves again
            .attr("class", "hover-line");

Answer №1

  1. To make an object follow the mouse without affecting underlying objects, use the style pointer-events:none;.

  2. If you want drawing elements to appear only in a specific area, apply a clipping path attribute to the group containing those elements. Make sure to attach the code for creating the clipPath element to a group.

  3. If your tooltip behavior is different from what you expect, provide more details or a working example link. Ensure that your brushed function includes actions related to tooltips and updates the x-scale function as needed.

Edit based on feedback

If adjusting the tooltip position to match the zoom level is your goal, simply update the x-coordinate after changing the x-scale domain:

    function brushed() {
        x.domain(brush.empty() ? x2.domain() : brush.extent());

        focus.selectAll("circle.dot")
             .attr("cx", function (d) { return x(d.date); } );

        focus.select(".path_steelblue").attr("d", line);
        focus.select(".path_blue").attr("d", line);
        focus.select(".path_yellow").attr("d", line);
        focus.select(".path_red").attr("d", line);
        focus.select(".x.axis").call(xAxis);
    }

You can optimize by assigning two classes to your lines for common and unique styling. Use space-separated classes and adjust CSS accordingly:

path.datapath {
}

g.focus path.datapath {
}

path.datapath.steelblue {
    stroke: steelblue;
}

In the brushed function, select all data lines at once using the common selector to efficiently update them:

    function brushed() {
        x.domain(brush.empty() ? x2.domain() : brush.extent());

        focus.selectAll("circle.dot")
             .attr("cx", function(d) { return x(d.date); } );

        focus.selectAll("path.datapath").attr("d", line);

        focus.select("g.x.axis").call(xAxis);
    }

The line function generates path data based on element data and assigned scales.

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