# 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.

Read the documentation.

### 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 {
const map = new google.maps.Map(
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.
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,
});
}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.
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,
});
}
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;
padding: 0;
}
style.css```

### HTML

```<!DOCTYPE html>
<html>
<head>
<title>Dashed Line Symbols (Polyline)</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script src="./index.js"></script>
</head>
<body>
<div id="map"></div>

<!-- Async script executes immediately and must be after any DOM elements used in callback. -->
<script
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&v=weekly"
async
></script>
</body>
</html>sample.html```
// 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> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly&channel=2" async ></script> </body> </html>

### Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

```  `git clone -b sample-overlay-symbol-dashed https://github.com/googlemaps/js-samples.git`
`cd js-samples`
`npm i`
`npm start`
```

Other samples can be tried by switching to any branch beginning with `sample-SAMPLE_NAME`.

```  `git checkout sample-SAMPLE_NAME`
`npm i`
`npm start`
```

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