119 lines
2.9 KiB
JavaScript
119 lines
2.9 KiB
JavaScript
/**
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* This module is used to handle user's interaction with the search form.
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*/
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import { DeclarationDataCenter } from "./declaration-data.js";
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const SEARCH_FORM = document.querySelector("#search_form");
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const SEARCH_INPUT = SEARCH_FORM.querySelector("input[name=q]");
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// Create an `div#search_results` to hold all search results.
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let sr = document.createElement("div");
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sr.id = "search_results";
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SEARCH_FORM.appendChild(sr);
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/**
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* Attach `selected` class to the the selected search result.
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*/
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function handleSearchCursorUpDown(down) {
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const sel = sr.querySelector(`.selected`);
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if (sel) {
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sel.classList.remove("selected");
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const toSelect = down
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? sel.nextSibling || sr.firstChild
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: sel.previousSibling || sr.lastChild;
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toSelect && toSelect.classList.add("selected");
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} else {
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const toSelect = down ? sr.firstChild : sr.lastChild;
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toSelect && toSelect.classList.add("selected");
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}
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}
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/**
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* Perform search (when enter is pressed).
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*/
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function handleSearchEnter() {
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const sel = sr.querySelector(`.selected`) || sr.firstChild;
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sel.click();
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}
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/**
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* Allow user to navigate search results with up/down arrow keys, and choose with enter.
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*/
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SEARCH_INPUT.addEventListener("keydown", (ev) => {
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switch (ev.key) {
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case "Down":
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case "ArrowDown":
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ev.preventDefault();
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handleSearchCursorUpDown(true);
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break;
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case "Up":
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case "ArrowUp":
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ev.preventDefault();
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handleSearchCursorUpDown(false);
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break;
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case "Enter":
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ev.preventDefault();
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handleSearchEnter();
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break;
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}
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});
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/**
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* Remove all children of a DOM node.
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*/
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function removeAllChildren(node) {
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while (node.firstChild) {
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node.removeChild(node.lastChild);
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}
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}
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/**
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* Handle user input and perform search.
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*/
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function handleSearch(dataCenter, err, ev) {
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const text = ev.target.value;
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// If no input clear all.
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if (!text) {
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sr.removeAttribute("state");
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removeAllChildren(sr);
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return;
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}
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// searching
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sr.setAttribute("state", "loading");
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if (dataCenter) {
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const result = dataCenter.search(text, false);
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// in case user has updated the input.
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if (ev.target.value != text) return;
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// update search results
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removeAllChildren(sr);
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for (const { name, docLink } of result) {
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const d = sr.appendChild(document.createElement("a"));
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d.innerText = name;
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d.title = name;
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d.href = SITE_ROOT + docLink;
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}
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}
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// handle error
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else {
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removeAllChildren(sr);
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const d = sr.appendChild(document.createElement("a"));
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d.innerText = `Cannot fetch data, please check your network connection.\n${err}`;
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}
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sr.setAttribute("state", "done");
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}
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DeclarationDataCenter.init()
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.then((dataCenter) => {
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// Search autocompletion.
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SEARCH_INPUT.addEventListener("input", ev => handleSearch(dataCenter, null, ev));
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})
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.catch(e => {
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SEARCH_INPUT.addEventListener("input", ev => handleSearch(null, e, ev));
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});
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