Uncaught TypeError: document.querySelector(...) is null header $:/plugins/krystal/plugin.js:77
The Krystal Plugin is not meant to work as a plugin that can be switched off. So - when transforming it to work as a layout - one Line of code requiring its header causes a bug when switching to another layout causes an error. How can I remove it?
Sorry for pasting the whole thing because my attempt to remove it caused other errors…
/*\
title: $:/plugins/krystal/plugin.js
type: application/javascript
module-type: startup
Sets plugin behavior
\*/
(function () {
const STORY_TIDDLER_TITLE = "$:/StoryList";
const ACTIVE_LINK_CLASS = "krystal-link--active";
const MAXIMIZED_TIDDLER_CLASS = "krystal-tiddler__frame--maximized";
const KRYSTAL_CONFIG = {
highlight: "$:/plugins/krystal/config/highlight",
tiddlerwidth: "$:/plugins/krystal/config/tiddlerwidth",
};
exports.after = ["render"];
exports.startup = function () {
header();
window.addEventListener("resize", header);
const throttledTiddlerFrameEffects = throttle(tiddlerFrameEffects, 100);
window.addEventListener("scroll", throttledTiddlerFrameEffects, true);
$tw.rootWidget.addEventListener("tm-remove", tiddlersCount);
$tw.rootWidget.addEventListener("tm-scroll", function (event) {
if (event.type === "tm-scroll") {
tiddlersCount(event);
scroll(event);
}
});
$tw.rootWidget.addEventListener("tm-maximize", function (event) {
if (event.type === "tm-maximize") {
tiddlerFullscreen(event.param);
}
});
$tw.hooks.addHook("th-navigating", closeTiddlersToRight);
$tw.wiki.addEventListener("change", highlightOpenTiddlerLinks);
$tw.wiki.addEventListener("change", reinitiateTiddlerFrameEffects);
};
function highlightOpenTiddlerLinks(changes) {
if (!$tw.utils.hop(changes, STORY_TIDDLER_TITLE)) {
return;
}
const config = $tw.wiki.getTiddler(KRYSTAL_CONFIG.highlight);
if (config && config.fields && config.fields.text === "disable") {
return;
}
const tiddlers = $tw.wiki.getTiddlerList(STORY_TIDDLER_TITLE);
Array.from(document.querySelectorAll(`.${ACTIVE_LINK_CLASS}`)).forEach(
(link) => link.classList.remove(ACTIVE_LINK_CLASS)
);
tiddlers.forEach((tiddler) => {
Array.from(
document.querySelectorAll(
`.tc-tiddler-body a[href="#${encodeURIComponent(tiddler)}"]`
)
).forEach((link) => link.classList.add(ACTIVE_LINK_CLASS));
});
}
function header() {
const height = document.querySelector(".krystal-header").offsetHeight;
document.documentElement.style.setProperty(
"--krystal-header-height",
`${height}px`
);
}
function tiddlersCount(event) {
const { widget } = event;
var tiddlersCount = widget.list.length;
document.body.style.setProperty("--tiddler-count", tiddlersCount);
}
function scroll(event) {
const { target: tiddlerElement } = event;
const mediaQueryList = window.matchMedia("(min-width: 960px)");
if (mediaQueryList.matches) {
var storyRiver = tiddlerElement.parentElement;
var tiddlers = Array.from(
storyRiver.querySelectorAll("div[data-tiddler-title]")
);
var tiddlerPosition = tiddlers.indexOf(tiddlerElement);
var tiddlerWidth = $tw.wiki.getTiddler(KRYSTAL_CONFIG.tiddlerwidth).fields
.text;
var windowWidth = window.innerWidth;
var position = windowWidth / 2 - tiddlerWidth / 2;
var newRiverPosition = Math.max(
tiddlerPosition * tiddlerWidth - position,
0
);
storyRiver.scroll({ left: newRiverPosition, behavior: "smooth" });
} else {
tiddlerElement.scrollIntoView({ behavior: "smooth" });
}
}
function tiddlerFrameEffects() {
var tiddlers = Array.from(document.querySelectorAll(".tc-tiddler-frame"));
var tiddlersCount = tiddlers.length;
if (tiddlersCount === 0) {
return;
}
var offset = 100;
var tiddlerPadding = Number(
window.getComputedStyle(tiddlers[0]).paddingRight.slice(0, -2)
);
var tiddlerWidth = tiddlers[0].offsetWidth;
var windowWidth = window.innerWidth;
tiddlers.forEach(function (tiddler, i) {
if (i === 0) {
return;
}
var tiddlerTitle = tiddler.querySelector(".krystal-tiddler__title");
// Edit Template
if (!tiddlerTitle) {
return;
}
var previousTiddler = tiddlers[i - 1];
var previousTiddlerTitle = previousTiddler.querySelector(
".krystal-tiddler__title"
);
var x = tiddler.getBoundingClientRect().left;
var start = x < offset + i * tiddlerPadding;
var end =
x > windowWidth - (offset + (tiddlersCount - i) * tiddlerPadding);
var startOverlay = x < tiddlerWidth + (i - 1) * tiddlerPadding;
tiddler.classList.toggle("krystal-tiddler__frame--overlay", startOverlay);
if (previousTiddlerTitle) {
previousTiddlerTitle.classList.toggle(
"krystal-tiddler__title--start-active",
start
);
if (!end) {
previousTiddler.classList.toggle(
"krystal-tiddler__frame--hide",
start
);
}
}
if (start) {
tiddlerTitle.classList.remove("krystal-tiddler__title--end");
}
if (end) {
tiddler.classList.add("krystal-tiddler__frame--overlay");
tiddler.classList.add("krystal-tiddler__frame--hide");
tiddlerTitle.classList.add(
"krystal-tiddler__title--end",
"krystal-tiddler__title--end-active"
);
} else {
if (!startOverlay) {
tiddler.classList.remove("krystal-tiddler__frame--overlay");
}
tiddler.classList.remove("krystal-tiddler__frame--hide");
tiddlerTitle.classList.remove("krystal-tiddler__title--end-active");
}
});
}
function reinitiateTiddlerFrameEffects(changes) {
if (!$tw.utils.hop(changes, STORY_TIDDLER_TITLE)) {
return;
}
var duration = $tw.utils.getAnimationDuration() || 0;
setTimeout(tiddlerFrameEffects, duration);
}
function closeTiddlersToRight(event) {
const storyTiddler = $tw.wiki.getTiddler(STORY_TIDDLER_TITLE);
const tiddlers = $tw.wiki.getTiddlerList(STORY_TIDDLER_TITLE);
const navigateFrom = event.navigateFromTitle;
const navigateTo = event.navigateTo;
const config = $tw.wiki.getTiddler(
"$:/plugins/krystal/config/close"
);
if (config && config.fields && config.fields.text === "disable") {
return event;
}
// Navigating from outside open tiddlers
if (!navigateFrom) {
return event;
}
// Destination tiddler already open
if (tiddlers.indexOf(navigateTo) === -1) {
const currentTiddlerIndex = tiddlers.indexOf(navigateFrom);
const tiddlersToClose = tiddlers.slice(currentTiddlerIndex + 1);
if (tiddlersToClose.length === 0) {
return event;
}
const newStoryList = tiddlers.filter(
(title) => !tiddlersToClose.includes(title)
);
$tw.wiki.addTiddler(
new $tw.Tiddler({ title: STORY_TIDDLER_TITLE }, storyTiddler, {
list: newStoryList,
})
);
}
return event;
}
function tiddlerFullscreen(tiddlerTitle) {
const tiddler = document.querySelector(
`div[data-tiddler-title="${tiddlerTitle}"]`
);
tiddler.classList.toggle(MAXIMIZED_TIDDLER_CLASS);
}
// ---
function throttle(callback, limit) {
var wait = false; // Initially, we're not waiting
return function () {
// We return a throttled function
if (!wait) {
// If we're not waiting
callback.call(); // Execute users function
wait = true; // Prevent future invocations
setTimeout(function () {
// After a period of time
wait = false; // And allow future invocations
}, limit);
}
};
}
})();
) that I fixed it: