Theodor-Springmann-Stiftung/kgpz_web
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hx-boost works properly; introduced cache for xslt processor

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This commit is contained in:
Simon Martens
2024-12-28 22:19:41 +01:00
parent 6e123054e2
commit 863b520d1c
5 changed files with 81 additions and 74 deletions
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75
views/transform/main.js
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@@ -3,7 +3,8 @@ import "./site.css";
const ATTR_XSLT_ONLOAD = "[xslt-onload]";
const ATTR_XSLT_TEMPLATE = "xslt-template";
const ATTR_XSLT_STATE = "xslt-transformed";
const ATTR_XSLT_REMOTE_TEMPLATE = "xslt-remote-template";
const xslt_processors = new Map();
function setup_xslt() {
let els = htmx.findAll(ATTR_XSLT_ONLOAD);
@@ -13,50 +14,44 @@ function setup_xslt() {
}
function transform_xslt(element) {
if (element.getAttribute(ATTR_XSLT_STATE) === "true") {
if (
element.getAttribute(ATTR_XSLT_STATE) === "true" ||
!element.hasAttribute(ATTR_XSLT_TEMPLATE)
) {
return;
}
let templateId = element.getAttribute(ATTR_XSLT_TEMPLATE);
let template = htmx.find("#" + templateId);
if (template) {
let content = template.innerHTML
? new DOMParser().parseFromString(template.innerHTML, "application/xml")
: template.contentDocument;
console.log(content);
let processor = new XSLTProcessor();
processor.importStylesheet(content);
let templateId = "#" + element.getAttribute(ATTR_XSLT_TEMPLATE);
let processor = xslt_processors.get(templateId);
if (!processor) {
let template = htmx.find(templateId);
if (template) {
let content = template.innerHTML
? new DOMParser().parseFromString(template.innerHTML, "application/xml")
: template.contentDocument;
processor = new XSLTProcessor();
processor.importStylesheet(content);
xslt_processors.set(templateId, processor);
} else {
throw new Error("Unknown XSLT template: " + templateId);
}
}
if (processor) {
let data = new DOMParser().parseFromString(element.innerHTML, "application/xml");
let frag = processor.transformToFragment(data, document);
let s = new XMLSerializer().serializeToString(frag);
element.innerHTML = s;
element.setAttribute(ATTR_XSLT_STATE, true);
} else if (element.hasAttribute(ATTR_XSLT_REMOTE_TEMPLATE)) {
let url = element.getAttribute(ATTR_XSLT_REMOTE_TEMPLATE);
let req = new Request(url, {
headers: { "Content-Type": "application/xslt+xml" },
cache: "default",
});
// WARNING: It is important to set the right cache cache policy server-side; else a request is
// made every time.
fetch(req)
.then((response) => response.text())
.then((text) => {
let content = new DOMParser().parseFromString(text, "application/xslt+xml");
let processor = new XSLTProcessor();
processor.importStylesheet(content);
let data = new DOMParser().parseFromString(element.innerHTML, "application/xml");
let frag = processor.transformToFragment(data, document);
let s = new XMLSerializer().serializeToString(frag);
element.innerHTML = s;
element.setAttribute(ATTR_XSLT_STATE, true);
});
// INFO: This allows to insert htmx elements in the transformed content
htmx.process(element);
} else {
throw new Error("Unknown XSLT template: " + templateId);
throw new Error("No Processor: " + templateId);
}
}
function setup() {
setup_xslt();
function setup_templates() {
let templates = document.querySelectorAll("template[simple]");
templates.forEach((template) => {
let templateId = template.getAttribute("id");
@@ -90,4 +85,16 @@ function setup() {
});
}
// INFO: This is intended to be callled once on website load
function setup() {
setup_xslt();
htmx.on("htmx:afterSettle", function (_) {
xslt_processors.clear();
setup_xslt();
});
setup_templates();
}
export { setup };