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+---
+title: "Cursed components: a dvorak-only text input"
+date: 2024-04-17T12:31:56.557Z
+tags:
+    - javascript
+    - html
+    - draft
+---
+
+This post was inspired by Terence Eden's post about [inputs that don't work with numpads](https://shkspr.mobi/blog/2024/04/i-cant-use-my-number-pad-for-2fa-codes/), and one of the [subsequent comments](https://mastodon.social/@Edent/112286509959315116). This got me thinking, wouldn't it be absolutely beyond cursed to have a text input that only allowed you to enter text if you were using a sufficiently cool keyboard layout.
+
+So, I present, the Dvorak-only Text Input:
+
+**TODO:** Make the input
+<input type="text" />
+
+## Detecting keyboard layout
+
+There's no _actual_ way to detect the keyboard layout as a named value using Javascript, but there is the [KeyboardLayoutMap](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardLayoutMap), which is currently supported in Chromium browsers and not much else[^1]. So what we can do is lookup how the user's keyboard layout maps particular keys, and then compare those to what we'd expect from a Dvorak layout.
+
+
+```javascript
+navigator.keyboard.getLayoutMap().then(layoutMap => {
+    if (layoutMap.get("KeyQ") === "'"
+        && layoutMap.get("KeyW") === ","
+        && layoutMap.get("KeyE") === "."
+        && layoutMap.get("KeyR") === "p"
+        && layoutMap.get("KeyT") === "y"
+        && layoutMap.get("KeyY") === "f") {
+            // The user is (probably) using Dvorak
+        }
+})
+```
+
+Because this call happens inside a Promise, it can't be directly used within an `onChange` event on the text input, so instead it rechecks every 200ms and stores the result:
+
+```javascript
+let isDvorak = false;
+
+setInterval(
+    () => navigator.keyboard.getLayoutMap().then(layoutMap => {
+        isDvorak = layoutMap.get("KeyQ") === "'"
+            && layoutMap.get("KeyW") === ","
+            && layoutMap.get("KeyE") === "."
+            && layoutMap.get("KeyR") === "p"
+            && layoutMap.get("KeyT") === "y"
+            && layoutMap.get("KeyY") === "f";
+    }),
+    200
+);
+```
+
+
+[^1]: But that's pretty on-brand for this particular use-case.
+
+<script type="text/javascript">
+let isDvorak = false;
+
+setInterval(
+    () => navigator.keyboard.getLayoutMap().then(layoutMap => {
+        isDvorak = layoutMap.get("KeyQ") === "'"
+            && layoutMap.get("KeyW") === ","
+            && layoutMap.get("KeyE") === "."
+            && layoutMap.get("KeyR") === "p"
+            && layoutMap.get("KeyT") === "y"
+            && layoutMap.get("KeyY") === "f";
+    }),
+    200
+);
+</script>
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