Tooltips remain inactive on the first plot until there is a change in the plot, triggering their functionality

I've encountered a strange issue with tooltips using d3-tip in a scatter plot. Initially, the tooltips are not functioning at all, and even the mouseover events are not triggering as expected.

The scatter plot consists of three sets of data on each axis. Oddly enough, when I switch to another set of data, the tooltips start working properly.

Furthermore, reverting back to the original data also makes the tooltips function correctly. You can view the website where this issue is occurring here: .

The tooltip setup looks like this:

// Setting up the tool tip
var tool_tip = d3.tip()
    .attr("class", "d3-tip")
    .offset([-8, 0])
    .html(d => `<strong>${d.state}</strong><br>${optionListXTitle[optionX]}: ${d[optionListX[optionX]]}<br>${optionListYTitle[optionY]}: ${d[optionListY[optionY]]}`);

// Linking the tool tip to the chart
chartGroup.selectAll(".stateCircleTrans").call(tool_tip);

// Setting up event listeners
chartGroup.selectAll(".stateCircleTrans")
        .on("mousemove", function (d) { console.log(`d: ${JSON.stringify(d)}`); tool_tip.show(d, this);})
        .on("mouseover", function (d) { console.log(`d: ${JSON.stringify(d)}`); tool_tip.show(d, this);})
        .on("mouseout", function (d) { tool_tip.hide(d);});

I have tried various recommendations, but none seem to resolve the issue at hand.

Why do the tooltips fail to work initially but start functioning once the data is changed?

Note: I managed to get it working based on advice from others to rearrange the code. Here's the updated section that fixed the problem:

// Adding new circles
transCircles.enter()
    .append("circle")
    .attr("class", "stateCircleTrans")
    .transition(t)
    .attr("cx", d => x(d[optionListX[optionX]]))
    .attr("cy", y(0));

Essentially, moving the attr("class") for each declaration above the transition resolved the issue.

Answer №1

During our previous discussions in the comments, we identified an issue where a class is declared after a transition:

    // Incorporate all new circles
    transCircles.enter().append("circle").transition(t)
    ...
    .attr("class", "stateCircleTrans")

This occurs because a "selection" object transforms into a "transition" object when the transition is initiated. A transition object differs slightly from a selection as the specified attributes only assume their defined values once the transition concludes. Throughout the transition, the attribute remains in an interpolation state, constantly changing to facilitate the animation.

When the class is declared post-transition, D3 attempts to interpolate undefined (as no class was initially defined) to 'stateCircleTrans' (the transition's target). Although there isn't support for interpolation between undefined and a string, D3 still executes the alteration during the transition; it just lacks smoothness.

This bug manifests solely during the initial rendering. In this phase, the transition hasn't had sufficient time to run, resulting in the class remaining undefined when the subsequent line is first implemented:

    // Associate tool tip with the chart
    chartGroup.selectAll(".stateCircleTrans").call(tool_tip);

The selection is empty since there are currently no ".stateCircleTrans" elements present.

In later iterations, D3 has completed the transition, ensuring the state never reverts back to undefined. Consequently, the transition strives to interpolate ".stateCircleTrans" to ".stateCircleTrans", which is trivial and doesn't alter the class anymore, thereby establishing the validity of the ".stateCircleTrans" selection for the program's remainder.

To circumvent this issue, it is recommended to declare the class within the selection object rather than the transition:

    // Integrate all new circles
    transCircles.enter().append("circle")
    .attr("class", "stateCircleTrans").transition(t)
    ...

This approach promptly assigns the 'stateCircleTrans' class to the circles, guaranteeing that the d3-tip call always functions correctly right from the beginning.

Answer №2

In the app.js file, make the following changes:

// Add all of the new circles
transCircles.enter()
    .append("circle")
    .attr("class", "stateCircleTrans") // Apply a class to the element before transitioning
    .transition(t)
    .attr("cx", d => x(d[optionListX[optionX]]))
    .attr("cy", y(0))
    .attr("r", circleRadius)
    .attr("fill-opacity", 0.0)
    .transition(t)
    .attr("fill-opacity", 0.0)
    .attr("cy", d => y(d[optionListY[optionY]]));

The issue lies in using the transition method with attr. It does not support assigning a class, resulting in unexpected behavior rather than an error. This topic is discussed further here.

For a functional example:

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