---
title: "opacityDrivenByProperty | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Function opacityDrivenByProperty

-   opacityDrivenByProperty(  
        colorramp: [ColorRamp](https://docs.maptiler.com/sdk-js/api-reference/classes/ColorRamp/),  
        property: string,  
    ): [DataDrivenPropertyValueSpecification](https://docs.maptiler.com/sdk-js/api-reference/types/DataDrivenPropertyValueSpecification/)<number\>[](#opacitydrivenbyproperty)
    
    Turns a ColorRamp instance into a MapLibre style for ramping the opacity, driven by a property
    
    #### Parameters
    
    -   colorramp: [ColorRamp](https://docs.maptiler.com/sdk-js/api-reference/classes/ColorRamp/)
    -   property: string
    
    #### Returns [DataDrivenPropertyValueSpecification](https://docs.maptiler.com/sdk-js/api-reference/types/DataDrivenPropertyValueSpecification/)<number\>