Attributes

`param.<name>` Syntax

Access any URL parameter inside a conditional attribute (data-next-show, data-next-hide) using param.<name>. Replace <name> with the URL query parameter name (case-sensitive).

<div data-next-show="param.variant == 'a'">
  Variant A only
</div>

Operators

Operator	Description	Example
`==`	Equal (with type coercion)	`param.mode == 'advanced'`
`!=`	Not equal	`param.theme != 'dark'`
`>`	Greater than (numeric)	`param.qty > 5`
`<`	Less than (numeric)	`param.age < 18`
`>=`	Greater than or equal	`param.qty >= 3`
`<=`	Less than or equal	`param.qty <= 10`
`&&`	Logical AND	`param.a == 'x' && cart.hasItems`
`\|\|`	Logical OR	`param.banner == 'n' \|\| param.theme == 'dark'`
`!`	Logical NOT	`!param.preview`
`param.name` (no operator)	Truthy check — fires when the parameter exists	`param.preview`

Lifecycle

Capture — On SDK init, all current URL parameters are read into sessionStorage.
Persist — Parameters survive navigation. Stored values remain accessible on pages that don't include the parameter in their URL.
Override — A new value on a later page overrides the stored value.
Re-evaluate — Conditional elements re-evaluate every time a parameter is set, cleared, or changed.

JavaScript API

Method	Description
`next.getParam(name)`	Returns the value or `undefined`
`next.getAllParams()`	Returns all parameters as an object
`next.hasParam(name)`	Returns `true` when the parameter is set
`next.setParam(name, value)`	Set a parameter (re-evaluates conditionals)
`next.setParams(object)`	Set multiple parameters
`next.clearParam(name)`	Remove a parameter

See JavaScript API for examples.

Common Conventions

A few parameter names that are commonly used in production landing pages. None of these are reserved by the SDK — they are just conventions.

Parameter	Convention	Use
`?reviews=n`	`n` = no	Hide customer testimonials section
`?timer=n`	`n` = no	Hide countdown timers
`?banner=n`	`n` = no	Hide promotional banner
`?seen=n`	`n` = no	Hide "as seen on" media logos
`?exit=n`	`n` = no	Disable exit-intent popup
`?variant=a` / `?variant=b`	A/B testing	Show one variant of a test
`?debug=true`	`true` = enabled	Show debug-only content
`?preview=true`	`true` = enabled	Show preview-only content

Notes

Parameter names are case-sensitive — ?Variant=a is different from ?variant=a.
The Webflow page builder strips quotes from attribute values. The SDK conditional parser accepts both param.x == 'n' and param.x==n syntactically.
Parameters are stored as strings in sessionStorage. Numeric comparisons work because the parser coerces both sides to numbers when the operator is numeric.
Use forcePackageId to pre-populate the cart from a URL — see Cart System → State → Force Package ID.