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Add search suggestions UI #5798
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| "use strict"; | ||
| const searchbox = document.getElementById("searchbox"); | ||
| const searchContainer = document.getElementById("search-container"); | ||
| const suggestions = document.getElementById("suggestions"); | ||
| let selectedSuggestion = -1; | ||
| let suggestionController; | ||
| let queuedSuggestions = 0; | ||
|
|
||
| function resetSuggestions() { | ||
| suggestions.textContent = ""; | ||
| selectedSuggestion = -1; | ||
| } | ||
|
|
||
| searchbox?.addEventListener("input", function () { | ||
| // If there is already a request in progress, | ||
| // abort. The user has made another input, | ||
| // invalidating the old query. | ||
| if (suggestionController != undefined) { | ||
| suggestionController.abort(); | ||
| } | ||
|
|
||
| // Only make a request for suggestions after | ||
| // there is a delay of at least 150 milliseconds | ||
| // between inputs. | ||
| queuedSuggestions++; | ||
| setTimeout(async function () { | ||
| queuedSuggestions--; | ||
| if (queuedSuggestions != 0) { | ||
| return; | ||
| } | ||
|
|
||
| // Only continue for queries of more than one | ||
| // character. | ||
| if (searchbox.value.length < 2) { | ||
| resetSuggestions(); | ||
| return; | ||
| } | ||
|
|
||
| // Create the controller which will be | ||
| // used to abort this request if another | ||
| // is made before it finishes. | ||
| suggestionController = new AbortController(); | ||
| const signal = suggestionController.signal; | ||
|
|
||
| // Make the request for suggestions. | ||
| try { | ||
| const resp = await fetch( | ||
| `/api/v1/search/suggestions?q=${encodeURIComponent(searchbox.value)}`, | ||
| { signal }, | ||
| ); | ||
| const body = await resp.json(); | ||
|
|
||
| // Put the results into DOM. | ||
| resetSuggestions(); | ||
| const results = body.suggestions; | ||
| for (let i = 0; i < results.length; i++) { | ||
| const s = document.createElement("a"); | ||
| s.href = "/search"; | ||
| s.innerText = results[i]; | ||
| s.setAttribute("role", "option"); | ||
| s.setAttribute("aria-selected", "false"); | ||
| s.addEventListener("click", function (e) { | ||
| searchbox.value = results[i]; | ||
| if (searchbox.form?.requestSubmit) { | ||
| searchbox.form.requestSubmit(); | ||
| } else { | ||
| searchbox.form?.submit(); | ||
| } | ||
| e.preventDefault(); | ||
| }); | ||
| suggestions.appendChild(s); | ||
| } | ||
| } catch (err) { | ||
| // Discard AbortError as it is expected. | ||
| if (err.name !== "AbortError") { | ||
| console.error(err); | ||
| } | ||
| } | ||
| }, 150); | ||
| }); | ||
|
|
||
| searchbox?.addEventListener("keydown", function (e) { | ||
| const currentSuggestions = suggestions.children; | ||
|
|
||
| // Navigate suggestions by key. | ||
| switch (e.key) { | ||
| case "ArrowDown": | ||
| selectedSuggestion++; | ||
| e.preventDefault(); | ||
| break; | ||
| case "ArrowUp": | ||
| selectedSuggestion--; | ||
| e.preventDefault(); | ||
| break; | ||
| case "Enter": | ||
| if (selectedSuggestion != -1) { | ||
| currentSuggestions[selectedSuggestion].click(); | ||
| e.preventDefault(); | ||
| return; | ||
| } | ||
| break; | ||
| } | ||
|
|
||
| // Loop around if you go beyond the end | ||
| // or before -1 (the resting position). | ||
| if (selectedSuggestion >= currentSuggestions.length) { | ||
| selectedSuggestion = -1; | ||
| } else if (selectedSuggestion < -1) { | ||
| selectedSuggestion = currentSuggestions.length - 1; | ||
| } | ||
|
|
||
| // Remove .active class from all elements | ||
| // except the active one. | ||
| for (let i = 0; i < currentSuggestions.length; i++) { | ||
| if (i == selectedSuggestion) { | ||
| currentSuggestions[i].classList.add("active"); | ||
| currentSuggestions[i].setAttribute("aria-selected", "true"); | ||
| } else if (currentSuggestions[i].classList.contains("active")) { | ||
| currentSuggestions[i].classList.remove("active"); | ||
| currentSuggestions[i].setAttribute("aria-selected", "false"); | ||
| } | ||
| } | ||
| }); |
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