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# Dashed Line Symbols (Polyline)

This example converts a polyline to a dashed line, by setting the opacity of the polyline to 0, and drawing an opaque symbol at a regular interval on the polyline.

### TypeScript

```// This example converts a polyline to a dashed line, by
// setting the opacity of the polyline to 0, and drawing an opaque symbol
// at a regular interval on the polyline.

function initMap(): void {
document.getElementById("map") as HTMLElement,
{
zoom: 6,
center: { lat: 20.291, lng: 153.027 },
mapTypeId: "terrain"
}
);

// Define a symbol using SVG path notation, with an opacity of 1.
const lineSymbol = {
path: "M 0,-1 0,1",
strokeOpacity: 1,
scale: 4
};

// Create the polyline, passing the symbol in the 'icons' property.
// Give the line an opacity of 0.
// Repeat the symbol at intervals of 20 pixels to create the dashed effect.
path: [
{ lat: 22.291, lng: 153.027 },
{ lat: 18.291, lng: 153.027 }
],
strokeOpacity: 0,
icons: [
{
icon: lineSymbol,
offset: "0",
repeat: "20px"
}
],
map: map
});
}index.ts```

### JavaScript

```// This example converts a polyline to a dashed line, by
// setting the opacity of the polyline to 0, and drawing an opaque symbol
// at a regular interval on the polyline.
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 6,
center: { lat: 20.291, lng: 153.027 },
mapTypeId: "terrain"
});
// Define a symbol using SVG path notation, with an opacity of 1.
const lineSymbol = {
path: "M 0,-1 0,1",
strokeOpacity: 1,
scale: 4
};
// Create the polyline, passing the symbol in the 'icons' property.
// Give the line an opacity of 0.
// Repeat the symbol at intervals of 20 pixels to create the dashed effect.
path: [
{ lat: 22.291, lng: 153.027 },
{ lat: 18.291, lng: 153.027 }
],
strokeOpacity: 0,
icons: [
{
icon: lineSymbol,
offset: "0",
repeat: "20px"
}
],
map: map
});
}
index.js```

### CSS

```/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
}
style.css```

### HTML

```<!DOCTYPE html>
<html>
<title>Dashed Line Symbols (Polyline)</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<script
defer
></script>
<script src="./app.js"></script>
<body>
<div id="map"></div>
</body>
</html>sample.html```

### All

```<!DOCTYPE html>
<html>
<title>Dashed Line Symbols (Polyline)</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<script
defer
></script>
<style type="text/css">
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
}
</style>
<script>
"use strict";

// This example converts a polyline to a dashed line, by
// setting the opacity of the polyline to 0, and drawing an opaque symbol
// at a regular interval on the polyline.
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 6,
center: {
lat: 20.291,
lng: 153.027
},
mapTypeId: "terrain"
}); // Define a symbol using SVG path notation, with an opacity of 1.

const lineSymbol = {
path: "M 0,-1 0,1",
strokeOpacity: 1,
scale: 4
}; // Create the polyline, passing the symbol in the 'icons' property.
// Give the line an opacity of 0.
// Repeat the symbol at intervals of 20 pixels to create the dashed effect.

path: [
{
lat: 22.291,
lng: 153.027
},
{
lat: 18.291,
lng: 153.027
}
],
strokeOpacity: 0,
icons: [
{
icon: lineSymbol,
offset: "0",
repeat: "20px"
}
],
map: map
});
}
</script>
<body>
<div id="map"></div>
</body>
</html>
inline.html```
"use strict"; // This example converts a polyline to a dashed line, by // setting the opacity of the polyline to 0, and drawing an opaque symbol // at a regular interval on the polyline. function initMap() { const map = new google.maps.Map(document.getElementById("map"), { zoom: 6, center: { lat: 20.291, lng: 153.027 }, mapTypeId: "terrain" }); // Define a symbol using SVG path notation, with an opacity of 1. const lineSymbol = { path: "M 0,-1 0,1", strokeOpacity: 1, scale: 4 }; // Create the polyline, passing the symbol in the 'icons' property. // Give the line an opacity of 0. // Repeat the symbol at intervals of 20 pixels to create the dashed effect. const line = new google.maps.Polyline({ path: [ { lat: 22.291, lng: 153.027 }, { lat: 18.291, lng: 153.027 } ], strokeOpacity: 0, icons: [ { icon: lineSymbol, offset: "0", repeat: "20px" } ], map: map }); }
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
<!DOCTYPE html> <html> <head> <title>Dashed Line Symbols (Polyline)</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBIwzALxUPNbatRBj3Xi1Uhp0fFzwWNBkE&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> </body> </html>

## Create a starter application from sample

A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.

### Run Locally

Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.

````npm i -g '@googlemaps/js-samples'`
`googlemaps-js-samples init overlay-symbol-dashed DESTINATION_FOLDER`
```