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--- | ||
layout: doc | ||
title: scala-js-dom | ||
--- | ||
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#### Statically typed DOM API for Scala.js | ||
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Scala-js-dom provides a nice statically typed interface to the DOM such that it can be called from Scala code without resorting to `js.Dynamic`. | ||
All javascript globals functions, singletons and classes are members of the `org.scalajs.dom`, | ||
`org.scalajs.dom.html`, `org.scalajs.dom.svg`, etc. packages. | ||
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For example: | ||
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```scala | ||
import org.scalajs.dom | ||
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def main() = dom.window.alert("Hi from scala-js-dom!") | ||
``` | ||
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## Usage | ||
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Add the following to your sbt build definition: | ||
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```scala | ||
libraryDependencies += "org.scala-js" %%% "scalajs-dom" % "@VERSION@" | ||
``` | ||
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then enjoy the types available in org.scalajs.dom. scalajs-dom @VERSION@ is built and published for Scala.js 1.7+ with Scala 2.11, 2.12, 2.13, and 3.1+. | ||
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To begin with, scala-js-dom organizes the full-list of DOM APIs into a number of buckets: | ||
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- dom.html: HTML element APIs | ||
- dom.svg: SVG element APIs | ||
- dom.idb: IndexedDB APIs | ||
- dom.css: CSS APIs | ||
- dom: Miscellanious, unclassified APIs | ||
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Most names have been shortened from names of the raw browser APIs, since the namespacing avoids collisions. By convention these types are imported qualified: e.g. as `html.Canvas` instead of directly as `Canvas`. There is also the `dom.raw` namespace which contains everything with their full, un-shortened name. | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This section is outdated now. We put everything back into |
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## Examples | ||
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You can start using the bindings using the following import: | ||
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```scala mdoc:js:shared | ||
import org.scalajs.dom._ | ||
``` | ||
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### Appending a child to a `Node` | ||
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```scala mdoc:js:shared | ||
def appendElement(div: html.Div): Unit = { | ||
val child = document.createElement("div") | ||
child.textContent = "I can add elements to DOM elements!" | ||
div.appendChild(child) | ||
} | ||
``` | ||
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```scala mdoc:js:invisible | ||
<div id="outer-container"></div> | ||
<button id="demo1-btn" class="button-run">Run</button> | ||
--- | ||
document.getElementById("demo1-btn").addEventListener("click", (ev: Event) => { | ||
appendElement(document.getElementById("outer-container").asInstanceOf[html.Div]) | ||
}) | ||
``` | ||
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### Add an EventListener for `onmousemove` | ||
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```scala mdoc:js:shared | ||
def showOnMouseCoordinates(mouseArea: html.Div, info: html.Pre): Unit = { | ||
mouseArea.onmousemove = (ev: MouseEvent) => | ||
info.textContent = s""" | ||
|ev.clientX: ${ev.clientX} | ||
|ev.clientY: ${ev.clientY} | ||
|ev.pageX: ${ev.pageX} | ||
|ev.screenX: ${ev.screenX} | ||
|ev.screenY: ${ev.screenY} | ||
""".stripMargin | ||
} | ||
``` | ||
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```scala mdoc:js:invisible | ||
<div id="demo2-container" style="display: flex; gap: 3em; margin-bottom: 1rem;"> | ||
<div id="mouse-container" style="width:300px;height:300px;border: 5px solid black;"></div> | ||
<pre id="demo2-output"></pre> | ||
</div> | ||
--- | ||
val mouseArea = document.getElementById("mouse-container").asInstanceOf[html.Div] | ||
val info = document.getElementById("demo2-output").asInstanceOf[html.Pre] | ||
showOnMouseCoordinates(mouseArea, info) | ||
``` | ||
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### Storing an item in `localStorage` | ||
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```scala mdoc:js:shared | ||
def storeInputInLocalStorage(input: html.Input, box: html.Div) = { | ||
val key = "myKey" | ||
input.value = window.localStorage.getItem(key) | ||
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input.onkeyup = { (e: Event) => | ||
window.localStorage.setItem(key, input.value) | ||
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box.textContent = s"Saved: ${input.value} to local storage!" | ||
} | ||
} | ||
``` | ||
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```scala mdoc:js:invisible | ||
<input id="demo3-input" type="text" /> | ||
<div id="demo3-output"></div> | ||
<button id="demo3-btn" class="button-run">Run</button> | ||
--- | ||
val input = document.getElementById("demo3-input").asInstanceOf[html.Input] | ||
val output = document.getElementById("demo3-output").asInstanceOf[html.Div] | ||
storeInputInLocalStorage(input, output) | ||
``` | ||
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### Using `Canvas` to draw | ||
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```scala mdoc:js:shared | ||
type Context2D = CanvasRenderingContext2D | ||
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def drawCuteSmiley(canvas: html.Canvas) = { | ||
val context = canvas.getContext("2d").asInstanceOf[Context2D] | ||
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val size = 150 | ||
canvas.width = size | ||
canvas.height = size | ||
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context.strokeStyle = "red" | ||
context.lineWidth = 3 | ||
context.beginPath() | ||
context.moveTo(size/3, 0) | ||
context.lineTo(size/3, size/3) | ||
context.moveTo(size*2/3, 0) | ||
context.lineTo(size*2/3, size/3) | ||
context.moveTo(size, size/2) | ||
context.arc(size/2, size/2, size/2, 0, 3.14) | ||
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context.stroke() | ||
} | ||
``` | ||
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```scala mdoc:js:invisible | ||
<canvas id="demo4-canvas"></canvas> | ||
--- | ||
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val canvas = document.getElementById("demo4-canvas").asInstanceOf[html.Canvas] | ||
drawCuteSmiley(canvas) | ||
``` | ||
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### Using `Fetch` to make API calls in the browser | ||
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```scala mdoc:js:shared | ||
import scala.concurrent.ExecutionContext.Implicits.global | ||
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def fetchBoredApi(element: html.Pre) = { | ||
val url = "https://www.boredapi.com/api/activity" | ||
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val responseText = for { | ||
response <- fetch(url).toFuture | ||
text <- response.text().toFuture | ||
} yield { | ||
text | ||
} | ||
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for (text <- responseText) | ||
element.textContent = text | ||
} | ||
``` | ||
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```scala mdoc:js:invisible | ||
<pre id="demo5-output"></pre> | ||
<button id="demo5-btn" class="button-run">Run</button> | ||
--- | ||
val output = document.getElementById("demo5-output").asInstanceOf[html.Pre] | ||
document.getElementById("demo5-btn").addEventListener("click", (ev: Event) => { | ||
fetchBoredApi(output) | ||
}) | ||
``` | ||
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### Styling an HTML element | ||
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```scala mdoc:js:shared | ||
def changeColor(div: html.Div) = { | ||
val colors = Seq("red", "green", "blue") | ||
val index = util.Random.nextInt(colors.length) | ||
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div.style.color = colors(index) | ||
} | ||
``` | ||
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```scala mdoc:js:invisible | ||
<div id="demo6-text">Color me!</div> | ||
<button id="demo6-btn" class="button-run">Run</button> | ||
--- | ||
document.getElementById("demo6-btn").addEventListener("click", (ev: Event) => { | ||
changeColor(document.getElementById("demo6-text").asInstanceOf[html.Div]) | ||
}) | ||
``` | ||
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### Encode in base64 | ||
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```scala mdoc:js:shared | ||
def encodeBase64(in: html.Input, out: html.Div) = { | ||
in.onkeyup = { (e: Event) => | ||
out.textContent = window.btoa(in.value) | ||
} | ||
} | ||
``` | ||
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```scala mdoc:js:invisible | ||
<input id="demo7-input"/> | ||
<div id="demo7-output"></div> | ||
--- | ||
val input = document.getElementById("demo7-input").asInstanceOf[html.Input] | ||
val output = document.getElementById("demo7-output").asInstanceOf[html.Div] | ||
encodeBase64(input, output) | ||
``` | ||
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## Contributing | ||
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The DOM API is always evolving, and `scala-js-dom` tries to provide a thin-but-idiomatic Scala interface to modern browser APIs, without breaking the spec. | ||
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If you see something that you think can be improved, feel free to send a pull request. See our [Contributing Guide](https://github.com/scala-js/scala-js-dom/blob/main/CONTRIBUTING.md) for a detailed overview for starting hacking on `scala-js-dom` and making a PR! | ||
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@@ -41,7 +41,8 @@ ThisBuild / prePR_nonCross := Def.sequential( | |
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Def.taskDyn { | ||
if (scalaVersion.value.startsWith("2.12.")) | ||
Def.task[Unit]((readme / Compile / compile).value) | ||
// TODO should this really be docs / Compile? | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. TODO? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I actually don't know if the current
work fine here? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I need to take another look at this. I was hoping we could decide how we are deploying the site so we can figure out what to do with the build :) |
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Def.task[Unit]((docs / Compile / compile).value) | ||
else | ||
Def.task(()) | ||
}, | ||
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libraryDependencies += "org.scala-js" %% "scalajs-env-jsdom-nodejs" % "1.1.0" | ||
libraryDependencies += "org.scala-js" %% "scalajs-env-selenium" % "1.1.1" | ||
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addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.10.4") | ||
addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.11.0") | ||
addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.10.4") | ||
addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.11.0") | ||
addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.11") | ||
addSbtPlugin("com.lihaoyi" % "scalatex-sbt-plugin" % "0.3.11") | ||
addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.7.1") | ||
addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.0") | ||
addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.7.1") | ||
addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.0") | ||
addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.3.7") |
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