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Crosshair

Overview

Crosshair is a pair of perpendicular lines (horizontal and vertical), moving with the mouse. It might be useful, when you need to get the particular data of an action, while the axes contain any other information, such as years/months or any kind of percentage. Also, it looks similar to an aim in shooting; it's easier to "hit" the necessary point and get some extra information about it with the crosshair on a web chart.

Crosshair listens to these events: mouseMove, mouseOver, mouseOut, when mouse is inside a map, Crosshair appears.

Enable

If you want to switch the Crosshair on, use the crosshair() method:

// turn the crosshair on
map.crosshair(true);

JsFiddle Playground

Appearance

Lines

In some situations you may not need one or both lines but highlighted labels are still necessary. Write xStroke(null) to remove the x-axis line (or yStroke(null) to remove the y-axis):

// remove the x-axis line
var crosshair = map.crosshair();
crosshair.xStroke(null); 

JsFiddle Playground

Labels

Disable

Use the standard function to disable the axes labels.

// disable the crosshair yLabels
var crosshair = map.crosshair();
crosshair.yLabel(false);

JsFiddle Playground

Change text

The crosshair label's format is the same as axis label's format by default. You may use the format() to change the crosshair's labels' performance.

// set the label formatting
var yLabel = map.crosshair().yLabel();
yLabel.format(function() {
	return "Lon:" + this.value;
});

Here is the sample with customized both x and y crosshair labels.

JsFiddle Playground