feat: prevent minus sign typing

Author: AntoineMoues

ember-amount-input/src/components/amount-input.ts

@@ -5,6 +5,7 @@ import './amount-input.css';
 const KEY_CODE_E = 69;
 const KEY_CODE_FULLSTOP = 190;
 const KEY_CODE_COMMA = 188;
+const KEY_CODE_MINUS = 189;
 
 export interface AmountInputArgs {
   /**
@@ -130,9 +131,21 @@ export default class AmountInput extends Component<AmountInputSignature> {
 
   @action
   onKeyDown(event: KeyboardEvent): boolean {
+    const isMinus = event.keyCode === KEY_CODE_MINUS || event.key === '-';
+
     if (event.keyCode === KEY_CODE_E) {
       event.preventDefault();
       return false;
+    } else if (isMinus) {
+      const { target } = event;
+      if (
+        target instanceof HTMLInputElement &&
+        target.value !== '' &&
+        target.selectionStart !== 0
+      ) {
+        event.preventDefault();
+        return false;
+      }
     } else if (
       this.numberOfDecimal === 0 &&
       [KEY_CODE_FULLSTOP, KEY_CODE_COMMA].includes(event.keyCode)

test-app/tests/integration/components/amount-input/component-test.ts

@@ -222,4 +222,38 @@ module('Integration | Component | amount-input', function (hooks) {
       });
     });
   });
+
+  test('should not prevent negative values', async function (this: TestContext, assert) {
+    this.value = 1;
+
+    await render<TestContext>(hbs`
+        <AmountInput
+          @numberOfDecimal={{0}}
+          @value={{this.value}}
+          @update={{fn (mut this.value)}}
+        />
+      `);
+
+    assert.dom('input').hasValue('1');
+
+    await typeIn('input', '.');
+    await blur('input');
+
+    assert.dom('input').hasValue('');
+
+    await typeIn('input', '-1000');
+    await blur('input');
+
+    assert.dom('input').hasValue('-1000');
+
+    await typeIn('input', '.');
+    await blur('input');
+
+    assert.dom('input').hasValue('');
+
+    await typeIn('input', '1000-');
+    await blur('input');
+
+    assert.dom('input').hasValue('1000');
+  });
 });