Integrating tooltips on Dimple.js line charts

Question

Integrating tooltips on Dimple.js line charts

A simplified network-style chart has been created using Dimple's line plot as the foundation. For example, please refer to this link: http://jsfiddle.net/cc1gpt2o/

  myChart.addCategoryAxis("x", "Entity");
  myChart.addCategoryAxis("y", "Entity").addOrderRule("Keyword");
  var z = myChart.addMeasureAxis("z", "Size");
  z.overrideMin = 0;
  z.overrideMax = 200;
  myChart.addSeries("Keyword", dimple.plot.line);
  myChart.addSeries("Keyword", dimple.plot.bubble);
  myChart.draw();

One issue encountered is that the line chart's tooltips only appear when hovering over points. Due to multiple overlapping points, it becomes challenging for users to distinguish between lines and values. It would be more beneficial if tooltips were visible while hovering over the lines connecting the points.

An attempt was made to utilize a D3 method that bisects the line to show information about the points. However, the complexity of applying this method in the current setup is a concern: -

Before delving deeper into that solution, is there a simpler way to achieve this within Dimple? (--e.g., transferring the circles' tooltip function to paths?)

javascript d3.js tooltip dimple.js

Answer 1

Answer №1

Regrettably, the

series.addEventHandler('mouseover', handler)

function seems to only trigger when hovering over the points on the lines in my observations. This functionality is not much of an improvement compared to the default behavior. If you want to target the lines themselves, you'll need to utilize regular d3 like so:

chart.series[0].shapes.on('mouseover', function(e){
   //handle
   // `e` contains data from the line
   // d3.event provides mouse position information
});

You can retrieve information about the line (the data associated with it) within that event object. Unfortunately, this data differs from the dimple.eventArgs object, making it impossible to use methods like dimple._showPointTooltip or other tooltip functionalities (which may not work anyway).

Additionally, you can obtain the x and y positions of the mouse using d3.event within the handler function. By combining information from these two objects, you should be able to place a custom tooltip at the current mouse position, potentially styling it to resemble the standard dimple tooltip.

One uncertainty I have is how to acquire the original corresponding value based on your mouse's position. It should be something similar to:

chart.series[0].y._scale.invert(d3.event.y);

In my initial testing, I struggled to get this approach to function correctly. Nonetheless, this information might serve as a useful starting point.

Answer 2

Regrettably, the

series.addEventHandler('mouseover', handler)

function seems to only trigger when hovering over the points on the lines in my observations. This functionality is not much of an improvement compared to the default behavior. If you want to target the lines themselves, you'll need to utilize regular d3 like so:

chart.series[0].shapes.on('mouseover', function(e){
   //handle
   // `e` contains data from the line
   // d3.event provides mouse position information
});

You can retrieve information about the line (the data associated with it) within that event object. Unfortunately, this data differs from the dimple.eventArgs object, making it impossible to use methods like dimple._showPointTooltip or other tooltip functionalities (which may not work anyway).

Additionally, you can obtain the x and y positions of the mouse using d3.event within the handler function. By combining information from these two objects, you should be able to place a custom tooltip at the current mouse position, potentially styling it to resemble the standard dimple tooltip.

One uncertainty I have is how to acquire the original corresponding value based on your mouse's position. It should be something similar to:

chart.series[0].y._scale.invert(d3.event.y);

In my initial testing, I struggled to get this approach to function correctly. Nonetheless, this information might serve as a useful starting point.

Integrating tooltips on Dimple.js line charts

Answer №1

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