Selecting a node and triggering a smooth transition using D3 when

Recently, I embarked on learning d3 and my current project involves creating a transition effect where text appears upon clicking mouse events on tree nodes. The nodeLayout is derived from the d3.layout.tree().

        var node = svg.selectAll("g.classNode")
            .data(nodeLayout.filter(function(d){return d.depth < 2;}));                     


        var nodeEnter = node
            .enter()
            .append("g")
            .attr("transform", function(d) { 
                return "translate(" + d.x  + "," + d.y + ")";
            })
            .on("mouseover",mouseover)
            .on("mouseout",mouseout)
            .on("click",mouseclick);

Here's the mouseclick function:

function mouseclick(d) {

    d3.select(this).append("text")
        .transition()
        .duration(2000)
        .attr("x",100)
        .attr("y",30)
        .attr("font-family", "sans-serif")
        .attr("font-size", "16px")
        .text(function(d){if(d.depth==1)return Hello;});}

I've encountered an issue where the .duration doesn't seem to be working as expected, but oddly enough, the .delay does. If anyone has any insights into why this might be happening, I would greatly appreciate it.

Answer №1

If you're looking to gradually reveal text, consider setting the text attributes first and then changing the opacity during the transition. Here's an example:

function showTextOnClick(d) {

d3.select(this).append("text")
    .attr("x", 100)
    .attr("y", 30)
    .attr("font-family", "sans-serif")
    .attr("font-size", "16px")
    .text(function(d){if(d.depth==1) return Hello;})
    .style("opacity", 1e-6)
    .transition()
       .duration(2000)
       .style("opacity", 1);

}

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