Commit c233950

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Fix TOC TypeError when current section is null, and only update current class when there's a change (as LI will never equal H2/H3).

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Lines changed: 6 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -69,19 +69,21 @@ class TOC {`
`69`	`69`	`if (top == TOC.lastTop) return;`
`70`	`70`	`TOC.lastTop = top;`
`71`	`71`
`72`		`- let minDiff = 1000000000, current = null;`
	`72`	`+ let minDiff = 1000000000, currentId = null;`
`73`	`73`	`for (let section of TOC.sections) {`
`74`	`74`	`let ot = section.offsetTop - 50;`
`75`	`75`	`if (ot > top) continue;`
`76`	`76`	`let diff = top - ot;`
`77`	`77`	`if (diff < minDiff) {`
`78`	`78`	`minDiff = diff;`
`79`		`- current = section;`
	`79`	`+ currentId = section.id;`
`80`	`80`	`}`
`81`	`81`	`}`
`82`		`- if (TOC.lastLi != current) {`
	`82`	`+`
	`83`	+ let currentLi = currentId ? document.querySelector(`#li_${currentId}`) : null;
	`84`	`+ if (TOC.lastLi != currentLi) {`
`83`	`85`	`if (TOC.lastLi != null) TOC.lastLi.classList.remove('current');`
`84`		`- TOC.lastLi = document.getElementById('li_'+current.id);`
	`86`	`+ TOC.lastLi = currentLi\|\|null;`
`85`	`87`	`if (TOC.lastLi != null) TOC.lastLi.classList.add('current');`
`86`	`88`	`}`
`87`	`89`	`}`

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