javascript - Setting title attribute for each summary tag if its parent details tag is open? -


i want add 'show' or 'hide' title each summary tag depends if parent details tag open:

<details open>         <summary>summary 1</summary>         <p>text 1</p> </details>  <details open>         <summary>summary 2</summary>         <p>text 2</p> </details>

i tried shows 'hide' though details not set open:

var detailselem = document.getelementsbytagname('details'); var summaryelem = document.getelementsbytagname('summary');  (i = 0; < summaryelem.length; i++) {   if (detailselem[i].display === '') {   summaryelem[i].title = 'show';   } else {   summaryelem[i].title = 'hide';   } }

i assume trying access element css property. if so, line wrong detailselem[i].display === ''.

it should detailselem[i].style.display.

also display cannot empty , values can either display, inline, inline-display, none...

here's better solution access element css property. use getcomputedstyle() method computed styles

var detailselem = document.getelementsbytagname('details'); var summaryelem = document.getelementsbytagname('summary');  (i = 0; < summaryelem.length; i++) {   var style = getcomputedstyle(detailselem[i]);   if (style.display === 'none') {     summaryelem[i].title = 'show';   } else {     summaryelem[i].title = 'hide';   } }

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