98 lines
3.8 KiB
JavaScript
98 lines
3.8 KiB
JavaScript
const handleUserInput = searchBar => {
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let xhrRequest = new XMLHttpRequest();
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xhrRequest.open("POST", "/autocomplete");
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xhrRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
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xhrRequest.onload = function() {
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if (xhrRequest.readyState === 4 && xhrRequest.status !== 200) {
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alert("Error fetching autocomplete results");
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return;
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}
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// Fill autocomplete with fetched results
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let autocompleteResults = JSON.parse(xhrRequest.responseText);
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autocomplete(searchBar, autocompleteResults[1]);
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};
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xhrRequest.send('q=' + searchBar.value);
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};
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const autocomplete = (searchInput, autocompleteResults) => {
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let currentFocus;
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searchInput.addEventListener("input", function () {
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let autocompleteList, autocompleteItem, i, val = this.value;
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closeAllLists();
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if (!val || !autocompleteResults) {
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return false;
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}
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currentFocus = -1;
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autocompleteList = document.createElement("div");
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autocompleteList.setAttribute("id", this.id + "-autocomplete-list");
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autocompleteList.setAttribute("class", "autocomplete-items");
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this.parentNode.appendChild(autocompleteList);
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for (i = 0; i < autocompleteResults.length; i++) {
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if (autocompleteResults[i].substr(0, val.length).toUpperCase() === val.toUpperCase()) {
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autocompleteItem = document.createElement("div");
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autocompleteItem.innerHTML = "<strong>" + autocompleteResults[i].substr(0, val.length) + "</strong>";
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autocompleteItem.innerHTML += autocompleteResults[i].substr(val.length);
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autocompleteItem.innerHTML += "<input type=\"hidden\" value=\"" + autocompleteResults[i] + "\">";
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autocompleteItem.addEventListener("click", function () {
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searchInput.value = this.getElementsByTagName("input")[0].value;
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closeAllLists();
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document.getElementById("search-form").submit();
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});
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autocompleteList.appendChild(autocompleteItem);
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}
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}
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});
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searchInput.addEventListener("keydown", function (e) {
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let suggestion = document.getElementById(this.id + "-autocomplete-list");
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if (suggestion) suggestion = suggestion.getElementsByTagName("div");
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if (e.keyCode === 40) { // down
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currentFocus++;
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addActive(suggestion);
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} else if (e.keyCode === 38) { //up
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currentFocus--;
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addActive(suggestion);
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} else if (e.keyCode === 13) { // enter
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e.preventDefault();
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if (currentFocus > -1) {
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if (suggestion) suggestion[currentFocus].click();
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}
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}
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});
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const addActive = suggestion => {
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if (!suggestion || !suggestion[currentFocus]) return false;
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removeActive(suggestion);
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if (currentFocus >= suggestion.length) currentFocus = 0;
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if (currentFocus < 0) currentFocus = (suggestion.length - 1);
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suggestion[currentFocus].classList.add("autocomplete-active");
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};
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const removeActive = suggestion => {
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for (let i = 0; i < suggestion.length; i++) {
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suggestion[i].classList.remove("autocomplete-active");
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}
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};
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const closeAllLists = el => {
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let suggestions = document.getElementsByClassName("autocomplete-items");
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for (let i = 0; i < suggestions.length; i++) {
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if (el !== suggestions[i] && el !== searchInput) {
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suggestions[i].parentNode.removeChild(suggestions[i]);
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}
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}
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};
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// Close lists and search when user selects a suggestion
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document.addEventListener("click", function (e) {
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closeAllLists(e.target);
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});
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}; |