Check trigger
Trigger the animations on checkbox change
Overview
A check trigger executes the animation when the <input type="checkbox"> or <input type="radio"> element is checked. The animation then starts to play in the normal direction from start to end. When the element is unchecked, the animation switch to backward direction and will play from the current state back to the start.
Syntax
To activate the check trigger, use the check. A CSS property is animated when the element receives the checked state.
Checkbox
Radio buttons
If you have multiple radio button group, make sure that all radios use the same name attribute
Examples
These examples show the usage of the check trigger in the various timeline types together with the combination with the different triggers.
Discrete timeline
Discrete timeline is the basic timeline that animate the properties when the check trigger is executed on the element.
Checkbox
Radio buttons
Sequenced timeline
Sequenced timeline animates the CSS properties in the sequence of steps using the check trigger.
Checkbox
Radio buttons
Offset-based timeline
Offset-based timeline combine the CSS-offsets with the sequence of steps to animate the properties, triggered by a check action.
Checkbox
Radio buttons
Combination
The check trigger can be combined with any other available triggers.
Parameters
Trigger can be customized with the parameters that are defined within its parentheses ().
Target
The target parameter specifies the external element on the page where the current trigger is applied. This means you can define an animation that starts when a trigger on a different element is activated. A real-world example: clicking the hamburger menu button makes an off-screen sidebar appear.
Options
The id, class and attribute CSS selectors can be used.
| Name | Value | Default | Description |
|---|---|---|---|
target |
class | id | attribute |
null |
CSS selector |
Examples
In these examples, we’ll use a <input id="example" type="checkbox"> as the target element where the check trigger is applied. This will then affect elements that reference #text as their target parameter.
For better clarity, you can interpret it as: When the check trigger is activated on the #text target element, the scale(2) CSS property is animated.
id selector
| Value | Example | Shorthand |
|---|---|---|
#{id-name} |
check(target: #navigation) |
check(#navigation) |
This examples shows how to use a target parameter with an id CSS selector defined with the #{id}.
Checkbox
<!-- Actual element that will be scaled -->
<!-- Shorthand -->
Radio button
<!-- Actual elements that will be animated -->
class selector
| Value | Example | Shorthand |
|---|---|---|
#{class-name} |
check(target: .navigation) |
check(.navigation) |
This examples shows how to use a target parameter with a class CSS selector defined by the .{class-name}.
Checkbox
<!-- Actual element that will be scaled -->
<!-- Shorthand -->
Radio button
<!-- Actual elements that will be animated -->
attribute selector
This examples shows how to use a target parameter with a attribute CSS selector defined by the attribute(attribute-name)
| Value | Example | Shorthand |
|---|---|---|
attribute({attribute-name}) |
check(target: attribute(data-animal="cat")) |
- |
Checkbox
<!-- Actual element that will be scaled -->
<!-- No shorthand -->
Radio button
<!-- Actual elements that will be animated -->