bind:checked for Checkboxes
Bind a boolean variable to a checkbox input's checked state.
bind:checked for Checkboxes is a free Sveltejs Academy lesson on CoddyKit. This is lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, and your progress syncs across the web and the CoddyKit app. The Sveltejs Academy course includes 4 lessons in total.
Checkbox Binding
Use bind:checked to sync a boolean with a checkbox input.
<input type="checkbox" bind:checked={agreed} />Reading the State
The bound variable is true when checked, false when not.
Toggling Visibility
Combine with {#if} to show or hide content based on the checkbox.
{#if agreed}<p>Thanks!</p>{/if}Setting Programmatically
Assigning to the variable toggles the checkbox display.
function reset() { agreed = false; }Multiple Checkboxes
For independent checkboxes, declare one variable per checkbox.
let sub = false, terms = false;Tri-State Inputs
The DOM has an indeterminate property too; you can bind it with bind:indeterminate.
<input type="checkbox" bind:indeterminate={partial} />Form Integration
Checkbox state participates in form submissions like any input.
Label Wrapping
Wrap the checkbox inside a <label> so clicking the label toggles it.
<label><input type="checkbox" bind:checked={dark} /> Dark mode</label>Accessibility
Always label checkboxes. Screen readers depend on visible labels for context.
Disabled State
Combine with disabled={...} for read-only checkboxes.
Reactive Side Effects
React to changes with a $: statement that runs when the bound variable updates.
$: if (dark) document.body.classList.add("dark");Quick Check
What does bind:checked bind?
Recap
bind:checked ties a boolean to a checkbox. Use bind:indeterminate for the third visual state.
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Frequently Asked Questions
Is the “bind:checked for Checkboxes” lesson free?
Yes — the full text of “bind:checked for Checkboxes” is free to read here on the web. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO. The Sveltejs Academy course includes 4 lessons in total.
What will I learn in “bind:checked for Checkboxes”?
Bind a boolean variable to a checkbox input's checked state. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 4.
How long does the “bind:checked for Checkboxes” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- bind:value for Text Inputs
- bind:checked for Checkboxes
- bind:group for Radio and Checkbox Groups
- bind:this for DOM Element References