How can I access javascript function in lightning component?

Hi Pranav,

Please refer to the link below:-

https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/js_helper.htm

https://developer.salesforce.com/blogs/developer-relations/2015/04/lightning-components-javascript-api.html

I hope it helps.

A helper function can be called from any JavaScript code in a component’s bundle, such as from a client-side controller or renderer.

for ex:

<aura:handler event="aura:doneRendering" action="{!c.higlightCurrentRecordId}"/>

Thanks