Group bindings in Svelte - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a group binding in Svelte?

A group binding in Svelte lets you link multiple inputs (like radio buttons or checkboxes) to a single variable, so they share the same value or state automatically.

beginner

How do you bind a group of radio buttons to one variable in Svelte?

Use the bind:group directive on each radio button with the same variable name. This way, only one radio button can be selected, and the variable holds the selected value.

intermediate

What happens when you change the bound variable in a group binding?

Changing the bound variable updates which input in the group is selected. The UI and the variable stay in sync automatically.

intermediate

Can group bindings be used with checkboxes in Svelte?

Yes. When binding a group of checkboxes, the bound variable is usually an array that holds all selected values. Checking or unchecking updates the array automatically.

beginner

Why are group bindings helpful in forms?

They simplify managing multiple related inputs by syncing their state with one variable. This reduces code and keeps UI and data consistent.

In Svelte, what does bind:group do when used on radio buttons?

A Disables all radio buttons

B Makes each radio button independent

C Changes the radio buttons to checkboxes

D Links all radios to one variable to track the selected value

bind:group connects radio buttons so only one can be selected and the variable holds that value.

What type of variable do you bind to a group of checkboxes in Svelte?

A An array

B A string

C A number

D A boolean

Checkbox groups bind to an array holding all selected values.

If you update the bound variable of a radio group in Svelte, what happens?

A The UI does not change

B The selected radio button updates to match the variable

C All radio buttons become unchecked

D An error occurs

The UI updates automatically to reflect the variable's value.

Which directive is used to bind a group of inputs in Svelte?

A bind:value

B bind:checked

C bind:group

D bind:this

bind:group is the directive for group bindings.

Why use group bindings instead of individual bindings for each input?

A To write less code and keep inputs in sync

B To disable inputs

C To make inputs invisible

D To prevent user interaction

Group bindings simplify code and keep UI and data consistent.

Explain how group bindings work in Svelte with radio buttons.

Think about how radio buttons share one choice.

Describe how to use group bindings with checkboxes in Svelte and what the bound variable represents.

Checkboxes can have many selections.