Alignment of tooltips in Javascript map visualizations

After a developer backed out of my project near the 95% completion mark, I have been working tirelessly to finish it on my own. My current focus is on adjusting the tooltip placement for the map featured on this page:

Visit here for context

You can view the source code here.

There are two main issues that I am struggling with:

  1. The tooltips for the bar charts should be positioned at the mouse pointer but are currently appearing far to the right of the charts.
  2. For the map section, the tooltips seem to disappear when scaling down to the bottom right half of the counties.

Despite dedicating numerous hours to trial-and-error attempts at finding a solution, as a non-developer, I have not been successful in resolving these problems. Any assistance would be greatly appreciated.

javascriptjquerycssd3.js

Answer №1

To ensure the map tooltip displays correctly, adjust the positioning of the bar chart by using the 'left' property instead of 'padding-left'. Currently, the bar chart is overlapping with the map chart, and adding a border can help visualize this overlap more clearly.

<div id="linechart" class="col-sm-3" style="width: 60%;padding-left:120px;">

Replace the above line with:

<div id="linechart" class="col-sm-3" style="width: 60%;left:125px;">

To display the bar tool tip accurately, Use d3.event.pageX to retrieve the x coordinate value of the mouse cursor. To get the precise x value, subtract the offsetLeft value.

var x = d3.event.pageX + 5 - document.getElementById("linechart").offsetLeft;

Answer №2

To display the tooltip correctly on a mouseover or hover event, you must specify the positioning for the left (x-axis) and top (y-axis). Consider using the following code snippet:

Include this style in your tooltip div: 

"left", (d3.event.pageX) + "px").style("top", (d3.event.pageY - 28) + "px"

For a practical demonstration, refer to this live example.

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