javascript - Positioning fixed element within an iframe depending on parent window scroll -


goal: i'm trying accomplish have sticky element in iframe positioned @ bottom of browser window - until hits bottom of iframe window, then, when scrolling further down on parent page element stays put, , if 1 scrolling again element positions @ bottom of browser window again.

without iframe simple solution (and showcase of want achieve) this: https://jsfiddle.net/30a1sxk9/2/

my page containing iframe looks this: https://jsfiddle.net/q9m1h2j5/1/

-> since scrolling happening outside iframe fixed position @ bottom.

i'm looking robust , performant solution position element (with proper boundaries) in iframe within iframe. main problem have no access surrounding page - except via javascript within iframe (cross origin should not make problems since container , iframe have same domain)
can't guarantee outside of iframe, have take account determining position of element. can't change general setup of page.

my approach this, inside iframe:

let $footer = $('.sticky-footer');  window.parent.onscroll = function() {   let footerpos = this.scrolly + this.innerheight - 60;      console.debug('onscroll: ', footerpos);   $footer.css({     position: 'absolute',     top: footerpos + 'px'   }) };

where put onscroll listener on window.parent , calculating , setting absolute position of element each event call.

but i'm having trouble figuring out how calculate exact absolute position sticky-footer supposed , boundaries allowed move. i'd have determine exact y top position of iframe , bottom position - somehow reliably possible?

also i'm not sure if setting absolute position approach - since after first prototyping noticed jittering when scrolling fast - maybe css transformations better? or there different way achieve this?

any help, solutions , hints appreciated!


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