mirror of https://github.com/sveltejs/svelte
32 lines
745 B
32 lines
745 B
<script>
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import { tick } from 'svelte';
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let text = `Select some text and hit the tab key to toggle uppercase`;
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async function handleKeydown(event) {
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if (event.key !== 'Tab') return;
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event.preventDefault();
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const { selectionStart, selectionEnd, value } = this;
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const selection = value.slice(selectionStart, selectionEnd);
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const replacement = /[a-z]/.test(selection) ? selection.toUpperCase() : selection.toLowerCase();
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text = value.slice(0, selectionStart) + replacement + value.slice(selectionEnd);
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await tick();
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this.selectionStart = selectionStart;
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this.selectionEnd = selectionEnd;
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}
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</script>
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<textarea value={text} on:keydown={handleKeydown} />
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<style>
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textarea {
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width: 100%;
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height: 200px;
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}
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</style>
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