SVG控件在Leaflet.js顶部不可见

Question

I'm using Leaflet 0.7.1 and want to draw a radial menu (like openstreetmap's iD editor) on top using d3. Some examples I found use Leaflet's overlayPane to append the svg element to:

var svgContainer= d3.select(map.getPanes().overlayPane).append("svg");

On mouseclick, I add the menu and reposition it to the screen xy coords:

map.on('contextmenu', function(e) {
    console.log('contextmenu()');
    var tooltip;
    var center = [e.layerPoint.x, e.layerPoint.y];
    var menu = svgContainer.append('g')
        .attr("class", 'leaflet-zoom-hide')
        .attr('class', 'radial-menu')
        .attr('transform', 'translate(' + center + ')')
        .attr('opacity', 0);
        menu.transition()
            .attr('opacity', 1);

        menu.append('path')
            .attr('class', 'radial-menu-background')
            .attr('d', 'M' + r * Math.sin(a0) + ',' +
                             r * Math.cos(a0) +
                      ' A' + r + ',' + r + ' 0 ' + 0 + ',0 ' +
                             (r * Math.sin(a1) + 1e-3) + ',' +
                             (r * Math.cos(a1) + 1e-3)) // Force positive-length path (#1305)
            .attr('stroke-width', 50)
            .attr('stroke-linecap', 'round');
    });

Somehow, the SVG paths get drawn (this is visible in the Chrome Inspector) but are behind the map object. When I 'drag' the SVG element just below the body tag in Inspector, I can see the circle paths.

Any ideas on how I can draw SVG 'menu' elements on top of Leaflet?

Thanks!!

See this fiddle for a demo. Right click or hold to add an invisible element.

ps. I asked this question on gis.stackexchange.com , too.

Answer 1

Solved. A colleague pointed out that the SVG container had no dimensions. Giving it the appropriate width and height proved to be the answer:

    svgContainer.attr("width", width).attr("height", height)