Shows a text along a Polyline.

Check out the demo !

The version on the gh-pages branch targets Leaflet 1.3.1.

For example, show path orientation on mouse over :

    var layer = L.polyLine(...);

    layer.on('mouseover', function () {
        this.setText('  ►  ', {repeat: true, attributes: {fill: 'red'}});
    });

    layer.on('mouseout', function () {
        this.setText(null);
    });

With a GeoJSON containing lines, it becomes:

    L.geoJson(data, {
        onEachFeature: function (feature, layer) {
            layer.setText(feature.properties.label);
        }
    }).addTo(map);

You can also apply attributes only to parts of the text, e.g. to create multi colored labels:

layer.setText([
  { fill: 'red', text: 'Red' },
  ' '
  { style: 'fill: blue', text: 'Blue' }
])

The text parameter of setText() can either be:

• A string: use this string as label
• An object: use value of key 'text' as content (which can be either string, object or array), other key/value pairs as attributes for a tspan SVG node.
• An array: The label consists of several parts, where each part can either be a string, an object or an array.

• repeat Specifies if the text should be repeated along the polyline (Default: false). Specify repeat as float to set the distance between each repetition in pixels (will be approximated by spaces).

• center Centers the text according to the polyline's bounding box (Default: false)

• below Show text below the path (Default: false)

• offset Set an offset to position text relative to the polyline (Default: width of stroke)

• orientation Rotate text. (Default: 0)

  • {orientation: angle} - rotate to a specified angle (e.g. {orientation: 15})
  • {orientation: flip} - flips the text 180deg correction for upside down text placement on west -> east lines
  • {orientation: perpendicular} - places text at right angles to the line.
  • {orientation: auto} - flips the text on (part of) ways running west to east, so that they are readable upside down.

• allowCrop If the line is too short to display the whole text, crop the text. If false, don't show the text at all. (Default: true).

• turnedText When orientation=auto is used, use this text for east -> west lines.

• attributes Object containing the attributes applied to the text tag. Check valid attributes here (Default: {})

The main idea comes from Tom Mac Wright's Getting serious about SVG

• Nothing changed yet.

• Add the orientation option (#27, thanks @kirkau)

• Allow HTTP and HTTPS to access the demo (#39, thanks @sonny89 and @leplatrem)

• Fix text centering for vertical lines (#33, #34, #38, thanks @msgoloborodov)

Breaking changes

• Text is now shown on top by default. Set option below to true to put the text below the layer.

• Fix bug when removing layer whose text was removed (fixes #18) (thanks Victor Gomes)
• Fix path width when using options.center (fixes #17) (thanks Brent Miller).

• Fix layer order (fixes #5) (thanks Albin Larsson)

• Stay on top after bringToFront
• Clean-up and fix onAdd and onRemove
• Fire mouse events from underlying text layer (thanks Lewis Christie)

• Initial working version

Many thanks to all contributors !