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feat(pat-autosuggest): Add batching support for AJAX requests.
This PR introduces three new options for that: max-initial-size: Defines the batch size for the initial request (default: 10). ajax-batch-size: Defines the batch size for subsequent requests (default: 10). ajax-timeout: Defines the timeout in milliseconds before a AJAX request is submitted. (default: 400). Ref: scrum-1638
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‎src/pat/auto-suggest/auto-suggest.js‎

Lines changed: 32 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,10 @@ const log = logging.getLogger("autosuggest");
1111
export const parser = new Parser("autosuggest");
1212
parser.addArgument("ajax-data-type", "JSON");
1313
parser.addArgument("ajax-search-index", "");
14+
parser.addArgument("ajax-timeout", 400);
1415
parser.addArgument("ajax-url", "");
16+
parser.addArgument("max-initial-size", 10); // AJAX search results limit for the first page.
17+
parser.addArgument("ajax-batch-size", 10); // AJAX search results limit for subsequent pages.
1518
parser.addArgument("allow-new-words", true); // Should custom tags be allowed?
1619
parser.addArgument("max-selection-size", 0);
1720
parser.addArgument("minimum-input-length"); // Don't restrict by default so that all results show
@@ -54,10 +57,11 @@ export default Base.extend({
5457
separator: this.options.valueSeparator,
5558
tokenSeparators: [","],
5659
openOnEnter: false,
57-
maximumSelectionSize: this.options.maxSelectionSize,
60+
maximumSelectionSize: this.options.max["selection-size"],
5861
minimumInputLength: this.options.minimumInputLength,
5962
allowClear:
60-
this.options.maxSelectionSize === 1 && !this.el.hasAttribute("required"),
63+
this.options.max["selection-size"] === 1 &&
64+
!this.el.hasAttribute("required"),
6165
};
6266
if (this.el.hasAttribute("readonly")) {
6367
config.placeholder = "";
@@ -179,7 +183,7 @@ export default Base.extend({
179183
// Even if words was [], we would get a tag stylee select
180184
// That was then properly working with ajax if configured.
181185

182-
if (this.options.maxSelectionSize === 1) {
186+
if (this.options.max["selection-size"] === 1) {
183187
config.data = words;
184188
// We allow exactly one value, use dropdown styles. How do we feed in words?
185189
} else {
@@ -198,7 +202,7 @@ export default Base.extend({
198202
for (const value of values) {
199203
data.push({ id: value, text: value });
200204
}
201-
if (this.options.maxSelectionSize === 1) {
205+
if (this.options.max["selection-size"] === 1) {
202206
data = data[0];
203207
}
204208
callback(data);
@@ -234,7 +238,7 @@ export default Base.extend({
234238
_data.push({ id: d, text: data[d] });
235239
}
236240
}
237-
if (this.options.maxSelectionSize === 1) {
241+
if (this.options.max["selection-size"] === 1) {
238242
_data = _data[0];
239243
}
240244
callback(_data);
@@ -253,19 +257,28 @@ export default Base.extend({
253257
url: this.options.ajax.url,
254258
dataType: this.options.ajax["data-type"],
255259
type: "GET",
256-
quietMillis: 400,
260+
quietMillis: this.options.ajax.timeout,
257261
data: (term, page) => {
258262
return {
259263
index: this.options.ajax["search-index"],
260264
q: term, // search term
261-
page_limit: 10,
265+
page_limit: this.page_limit(page),
262266
page: page,
263267
};
264268
},
265269
results: (data, page) => {
266-
// parse the results into the format expected by Select2.
270+
// Parse the results into the format expected by Select2.
267271
// data must be a list of objects with keys "id" and "text"
268-
return { results: data, page: page };
272+
273+
// Check whether there are more results to come.
274+
// There are maybe more results if the number of
275+
// items is the same as the batch-size.
276+
// We expect the backend to return an empty list if
277+
// a batch page is requested where there are no
278+
// more results.
279+
const load_more =
280+
Object.keys(data).length >= this.page_limit(page);
281+
return { results: data, page: page, more: load_more };
269282
},
270283
},
271284
},
@@ -275,6 +288,16 @@ export default Base.extend({
275288
return config;
276289
},
277290

291+
page_limit(page) {
292+
// Page limit for the first page of a batch.
293+
let page_limit = this.options.max["initial-size"];
294+
if (page > 1) {
295+
// Page limit for subsequent pages.
296+
page_limit = this.options.ajax["batch-size"];
297+
}
298+
return page_limit;
299+
},
300+
278301
destroy($el) {
279302
$el.off(".pat-autosuggest");
280303
$el.select2("destroy");

‎src/pat/auto-suggest/auto-suggest.test.js‎

Lines changed: 163 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5,6 +5,26 @@ import utils from "../../core/utils";
55
import registry from "../../core/registry";
66
import { jest } from "@jest/globals";
77

8+
// Need to import for the ajax mock to work.
9+
import "select2";
10+
11+
const mock_fetch_ajax = (...data) => {
12+
// Data format: [{id: str, text: str}, ... ], ...
13+
// first batch ^ ^ second batch
14+
15+
// NOTE: You need to add a trailing comma if you add only one argument to
16+
// make the multi-argument dereferencing work.
17+
18+
// Mock Select2
19+
$.fn.select2.ajaxDefaults.transport = jest.fn().mockImplementation((opts) => {
20+
// Get the batch page
21+
const page = opts.data.page - 1;
22+
23+
// Return the data for the batch
24+
return opts.success(data[page]);
25+
});
26+
};
27+
828
var testutils = {
929
createInputElement: function (c) {
1030
var cfg = c || {};
@@ -545,4 +565,147 @@ describe("pat-autosuggest", function () {
545565
expect(selected.length).toBe(0);
546566
});
547567
});
568+
569+
describe("6 - AJAX tests", function () {
570+
it("6.1 - AJAX works with a simple data structure.", async function () {
571+
mock_fetch_ajax(
572+
[
573+
{ id: "1", text: "apple" },
574+
{ id: "2", text: "orange" },
575+
] // Note the trailing comma to make the multi-argument dereferencing work.
576+
);
577+
578+
document.body.innerHTML = `
579+
<input
580+
type="text"
581+
class="pat-autosuggest"
582+
data-pat-autosuggest="
583+
ajax-url: http://test.org/test;
584+
ajax-timeout: 1;
585+
" />
586+
`;
587+
588+
const input = document.querySelector("input");
589+
new pattern(input);
590+
await utils.timeout(1); // wait a tick for async to settle.
591+
592+
$(".select2-input").click();
593+
await utils.timeout(1); // wait for ajax to finish.
594+
595+
const results = $(document.querySelectorAll(".select2-results li"));
596+
expect(results.length).toBe(2);
597+
598+
$(results[0]).mouseup();
599+
600+
const selected = document.querySelectorAll(".select2-search-choice");
601+
expect(selected.length).toBe(1);
602+
expect(selected[0].textContent.trim()).toBe("apple");
603+
expect(input.value).toBe("1");
604+
});
605+
606+
// This test is so flaky, just skip it if it fails.
607+
it.skip.failing("6.2 - AJAX works with batches.", async function () {
608+
mock_fetch_ajax(
609+
[
610+
{ id: "1", text: "one" },
611+
{ id: "2", text: "two" },
612+
{ id: "3", text: "three" },
613+
{ id: "4", text: "four" },
614+
],
615+
[
616+
{ id: "5", text: "five" },
617+
{ id: "6", text: "six" },
618+
],
619+
[{ id: "7", text: "three" }]
620+
);
621+
622+
document.body.innerHTML = `
623+
<input
624+
type="text"
625+
class="pat-autosuggest"
626+
data-pat-autosuggest="
627+
ajax-url: http://test.org/test;
628+
ajax-timeout: 1;
629+
max-initial-size: 4;
630+
ajax-batch-size: 2;
631+
" />
632+
`;
633+
634+
const input = document.querySelector("input");
635+
new pattern(input);
636+
await utils.timeout(1); // wait a tick for async to settle.
637+
638+
// Load batch 1 with batch size 4
639+
$(".select2-input").click();
640+
await utils.timeout(1); // wait for ajax to finish.
641+
642+
const results_1 = $(
643+
document.querySelectorAll(".select2-results .select2-result")
644+
);
645+
expect(results_1.length).toBe(4);
646+
647+
const load_more_1 = $(
648+
document.querySelectorAll(".select2-results .select2-more-results")
649+
);
650+
expect(load_more_1.length).toBe(1);
651+
652+
// Load batch 2 with batch size 2
653+
$(load_more_1[0]).mouseup();
654+
// NOTE: Flaky behavior needs multiple timeouts 👌
655+
await utils.timeout(1); // wait for ajax to finish.
656+
await utils.timeout(1); // wait for ajax to finish.
657+
await utils.timeout(1); // wait for ajax to finish.
658+
await utils.timeout(1); // wait for ajax to finish.
659+
await utils.timeout(1); // wait for ajax to finish.
660+
await utils.timeout(1); // wait for ajax to finish.
661+
await utils.timeout(1); // wait for ajax to finish.
662+
await utils.timeout(1); // wait for ajax to finish.
663+
await utils.timeout(1); // wait for ajax to finish.
664+
await utils.timeout(1); // wait for ajax to finish.
665+
await utils.timeout(1); // wait for ajax to finish.
666+
await utils.timeout(1); // wait for ajax to finish.
667+
await utils.timeout(1); // wait for ajax to finish.
668+
await utils.timeout(1); // wait for ajax to finish.
669+
await utils.timeout(1); // wait for ajax to finish.
670+
671+
const results_2 = $(
672+
document.querySelectorAll(".select2-results .select2-result")
673+
);
674+
expect(results_2.length).toBe(6);
675+
676+
const load_more_2 = $(
677+
document.querySelectorAll(".select2-results .select2-more-results")
678+
);
679+
expect(load_more_2.length).toBe(1);
680+
681+
// Load final batch 2
682+
$(load_more_2[0]).mouseup();
683+
// NOTE: Flaky behavior needs multiple timeouts 🤘
684+
await utils.timeout(1); // wait for ajax to finish.
685+
await utils.timeout(1); // wait for ajax to finish.
686+
await utils.timeout(1); // wait for ajax to finish.
687+
await utils.timeout(1); // wait for ajax to finish.
688+
await utils.timeout(1); // wait for ajax to finish.
689+
await utils.timeout(1); // wait for ajax to finish.
690+
await utils.timeout(1); // wait for ajax to finish.
691+
await utils.timeout(1); // wait for ajax to finish.
692+
await utils.timeout(1); // wait for ajax to finish.
693+
await utils.timeout(1); // wait for ajax to finish.
694+
await utils.timeout(1); // wait for ajax to finish.
695+
await utils.timeout(1); // wait for ajax to finish.
696+
await utils.timeout(1); // wait for ajax to finish.
697+
await utils.timeout(1); // wait for ajax to finish.
698+
await utils.timeout(1); // wait for ajax to finish.
699+
700+
const results_3 = $(
701+
document.querySelectorAll(".select2-results .select2-result")
702+
);
703+
expect(results_3.length).toBe(7);
704+
705+
const load_more_3 = $(
706+
document.querySelectorAll(".select2-results .select2-more-results")
707+
);
708+
expect(load_more_3.length).toBe(0);
709+
});
710+
});
548711
});

‎src/pat/auto-suggest/documentation.md‎

Lines changed: 36 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -34,16 +34,52 @@ Pre-fill the input element with words in JSON format and don't allow the user to
3434
prefill-json: {"john-snow":"John Snow"};
3535
allow-new-words: false;' type="text"></input>
3636

37+
### Batching support
38+
39+
This pattern can load data in batches via AJAX.
40+
The following example demonstrates how define batch sizes for the initial load (`max-initial-size`) and for subsequent loads (`ajax-batch-size`).
41+
Both values default to 10.
42+
43+
<input
44+
type="text"
45+
class="pat-auto-suggest"
46+
data-pat-auto-suggest="
47+
ajax-url: /path/to/data.json;
48+
ajax-batch-size: 10;
49+
max-initial-size: 10;
50+
"
51+
/>
52+
53+
---
54+
55+
**Note**
56+
57+
The server needs to support batching, otherwise these options do not have any effect.
58+
59+
---
60+
61+
### AJAX parameters submitted to the server
62+
63+
| Parameter | Description |
64+
| ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
65+
| index | The optional search index to be used on the server, if needed. |
66+
| q | The search term. |
67+
| page_limit | The number of items to be returned per page. Based on the current page it is wether `max-initial-size` (page 1) or `ajax-batch-size` (page 2). |
68+
| page | The current page number. |
69+
3770
### Option reference
3871

3972
You can customise the behaviour of a gallery through options in the `data-pat-auto-suggest` attribute.
4073

4174
| Property | Type | Default Value | Description |
4275
| -------------------- | ------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
76+
| ajax-batch-size | Number | 10 | Batch size for subsequent pages of a bigger batch. For the first page, `max-initial-size` is used. |
4377
| ajax-data-type | String | "json" | In what format will AJAX fetched data be returned in? |
4478
| ajax-search-index | String | | The index or key which must be used to determine the value from the returned data. |
79+
| ajax-timeout | Number | 400 | Timeout before new ajax requests are sent. The default value is set ot `400` milliseconds and prevents querying the server too often while typing. |
4580
| ajax-url | URL | | The URL which must be called via AJAX to fetch remote data. |
4681
| allow-new-words | Boolean | true | Besides the suggested words, also allow custom user-defined words to be entered. |
82+
| max-initial-size | Number | 10 | Initial batch size. Display `max-initial-size` items on the first page of a bigger result set. |
4783
| max-selection-size | Number | 0 | How many values are allowed? Provide a positive number or 0 for unlimited. |
4884
| placeholder | String | Enter text | The placeholder text for the form input. The `placeholder` attribute of the form element can also be used. |
4985
| prefill | List | | A comma separated list of values with which the form element must be filled in with. The `value-separator` option does not have an effect here. |

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