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[LiveComponent] Add validation modifiers (min_length, max_length, min_value, max_value) to data-model inputs
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-17
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‎src/LiveComponent/CHANGELOG.md‎

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@@ -1,5 +1,19 @@
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# CHANGELOG
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## 2.28.0
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- Add new modifiers for input validations, useful to prevent uneccessary HTTP requests:
6+
- `min_length` and `max_length`: validate length from textual input elements
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- `min_value` and `max_value`: validate value from numeral input elements
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```twig
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<!-- Do not trigger model update until 3 characters are typed -->
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<input data-model="min_length(3)|username" type="text" value="" />
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<!-- Only trigger updates when value number is between 10 and 100 -->
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<input data-model="min_value(10)|max_value(100)|quantity" type="number" value="20" />
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```
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317
## 2.27.0
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- Add events assertions in `InteractsWithLiveComponents`:

‎src/LiveComponent/assets/dist/Directive/get_model_binding.d.ts‎

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Original file line numberDiff line numberDiff line change
@@ -5,5 +5,9 @@ export interface ModelBinding {
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shouldRender: boolean;
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debounce: number | boolean;
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targetEventName: string | null;
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minLength: number | null;
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maxLength: number | null;
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minValue: number | null;
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maxValue: number | null;
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}
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export default function (modelDirective: Directive): ModelBinding;

‎src/LiveComponent/assets/dist/dom_utils.d.ts‎

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@@ -8,3 +8,6 @@ export declare function getModelDirectiveFromElement(element: HTMLElement, throw
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export declare function elementBelongsToThisComponent(element: Element, component: Component): boolean;
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export declare function cloneHTMLElement(element: HTMLElement): HTMLElement;
1010
export declare function htmlToElement(html: string): HTMLElement;
11+
export declare function isTextualInputElement(el: HTMLElement): el is HTMLInputElement;
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export declare function isTextareaElement(el: HTMLElement): el is HTMLTextAreaElement;
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export declare function isNumericalInputElement(element: Element): element is HTMLInputElement;

‎src/LiveComponent/assets/dist/live_controller.js‎

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Original file line numberDiff line numberDiff line change
@@ -475,6 +475,15 @@ const getMultipleCheckboxValue = (element, currentValues) => {
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return finalValues;
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};
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const inputValue = (element) => element.dataset.value ? element.dataset.value : element.value;
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function isTextualInputElement(el) {
479+
return el instanceof HTMLInputElement && ['text', 'email', 'password', 'search', 'tel', 'url'].includes(el.type);
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}
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function isTextareaElement(el) {
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return el instanceof HTMLTextAreaElement;
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}
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function isNumericalInputElement(element) {
485+
return element instanceof HTMLInputElement && ['number', 'range'].includes(element.type);
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}
478487

479488
class HookManager {
480489
constructor() {
@@ -2343,6 +2352,10 @@ function getModelBinding (modelDirective) {
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let shouldRender = true;
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let targetEventName = null;
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let debounce = false;
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let minLength = null;
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let maxLength = null;
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let minValue = null;
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let maxValue = null;
23462359
modelDirective.modifiers.forEach((modifier) => {
23472360
switch (modifier.name) {
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case 'on':
@@ -2360,6 +2373,18 @@ function getModelBinding (modelDirective) {
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case 'debounce':
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debounce = modifier.value ? Number.parseInt(modifier.value) : true;
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break;
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case 'min_length':
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minLength = modifier.value ? Number.parseInt(modifier.value) : null;
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break;
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case 'max_length':
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maxLength = modifier.value ? Number.parseInt(modifier.value) : null;
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break;
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case 'min_value':
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minValue = modifier.value ? Number.parseFloat(modifier.value) : null;
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break;
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case 'max_value':
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maxValue = modifier.value ? Number.parseFloat(modifier.value) : null;
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break;
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default:
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throw new Error(`Unknown modifier "${modifier.name}" in data-model="${modelDirective.getString()}".`);
23652390
}
@@ -2371,6 +2396,10 @@ function getModelBinding (modelDirective) {
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shouldRender,
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debounce,
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targetEventName,
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minLength,
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maxLength,
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minValue,
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maxValue,
23742403
};
23752404
}
23762405

@@ -3153,6 +3182,27 @@ class LiveControllerDefault extends Controller {
31533182
}
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}
31553184
const finalValue = getValueFromElement(element, this.component.valueStore);
3185+
if (isTextualInputElement(element) || isTextareaElement(element)) {
3186+
if (modelBinding.minLength !== null &&
3187+
typeof finalValue === 'string' &&
3188+
finalValue.length < modelBinding.minLength) {
3189+
return;
3190+
}
3191+
if (modelBinding.maxLength !== null &&
3192+
typeof finalValue === 'string' &&
3193+
finalValue.length > modelBinding.maxLength) {
3194+
return;
3195+
}
3196+
}
3197+
if (isNumericalInputElement(element)) {
3198+
const numericValue = Number(finalValue);
3199+
if (modelBinding.minValue !== null && numericValue < modelBinding.minValue) {
3200+
return;
3201+
}
3202+
if (modelBinding.maxValue !== null && numericValue > modelBinding.maxValue) {
3203+
return;
3204+
}
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}
31563206
this.component.set(modelBinding.modelName, finalValue, modelBinding.shouldRender, modelBinding.debounce);
31573207
}
31583208
dispatchEvent(name, detail = {}, canBubble = true, cancelable = false) {

‎src/LiveComponent/assets/src/Directive/get_model_binding.ts‎

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Original file line numberDiff line numberDiff line change
@@ -6,12 +6,20 @@ export interface ModelBinding {
66
shouldRender: boolean;
77
debounce: number | boolean;
88
targetEventName: string | null;
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minLength: number | null;
10+
maxLength: number | null;
11+
minValue: number | null;
12+
maxValue: number | null;
913
}
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1115
export default function (modelDirective: Directive): ModelBinding {
1216
let shouldRender = true;
1317
let targetEventName = null;
1418
let debounce: number | boolean = false;
19+
let minLength: number | null = null;
20+
let maxLength: number | null = null;
21+
let minValue: number | null = null;
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let maxValue: number | null = null;
1523

1624
modelDirective.modifiers.forEach((modifier) => {
1725
switch (modifier.name) {
@@ -38,6 +46,26 @@ export default function (modelDirective: Directive): ModelBinding {
3846
case 'debounce':
3947
debounce = modifier.value ? Number.parseInt(modifier.value) : true;
4048

49+
break;
50+
51+
case 'min_length':
52+
minLength = modifier.value ? Number.parseInt(modifier.value) : null;
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54+
break;
55+
56+
case 'max_length':
57+
maxLength = modifier.value ? Number.parseInt(modifier.value) : null;
58+
59+
break;
60+
61+
case 'min_value':
62+
minValue = modifier.value ? Number.parseFloat(modifier.value) : null;
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64+
break;
65+
66+
case 'max_value':
67+
maxValue = modifier.value ? Number.parseFloat(modifier.value) : null;
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4169
break;
4270
default:
4371
throw new Error(`Unknown modifier "${modifier.name}" in data-model="${modelDirective.getString()}".`);
@@ -52,5 +80,9 @@ export default function (modelDirective: Directive): ModelBinding {
5280
shouldRender,
5381
debounce,
5482
targetEventName,
83+
minLength,
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maxLength,
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minValue,
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maxValue,
5587
};
5688
}

‎src/LiveComponent/assets/src/dom_utils.ts‎

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Original file line numberDiff line numberDiff line change
@@ -262,3 +262,24 @@ const getMultipleCheckboxValue = (element: HTMLInputElement, currentValues: Arra
262262

263263
const inputValue = (element: HTMLInputElement): string =>
264264
element.dataset.value ? element.dataset.value : element.value;
265+
266+
/**
267+
* Checks whether the given element is a textual input (input[type=text/email/...]).
268+
*/
269+
export function isTextualInputElement(el: HTMLElement): el is HTMLInputElement {
270+
return el instanceof HTMLInputElement && ['text', 'email', 'password', 'search', 'tel', 'url'].includes(el.type);
271+
}
272+
273+
/**
274+
* Checks whether the given element is a textarea.
275+
*/
276+
export function isTextareaElement(el: HTMLElement): el is HTMLTextAreaElement {
277+
return el instanceof HTMLTextAreaElement;
278+
}
279+
280+
/**
281+
* Checks whether the given element is a numerical input (input[type=number] or input[type=range]).
282+
*/
283+
export function isNumericalInputElement(element: Element): element is HTMLInputElement {
284+
return element instanceof HTMLInputElement && ['number', 'range'].includes(element.type);
285+
}

‎src/LiveComponent/assets/src/live_controller.ts‎

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Original file line numberDiff line numberDiff line change
@@ -13,7 +13,14 @@ import SetValueOntoModelFieldsPlugin from './Component/plugins/SetValueOntoModel
1313
import ValidatedFieldsPlugin from './Component/plugins/ValidatedFieldsPlugin';
1414
import { type DirectiveModifier, parseDirectives } from './Directive/directives_parser';
1515
import getModelBinding from './Directive/get_model_binding';
16-
import { elementBelongsToThisComponent, getModelDirectiveFromElement, getValueFromElement } from './dom_utils';
16+
import {
17+
elementBelongsToThisComponent,
18+
getModelDirectiveFromElement,
19+
getValueFromElement,
20+
isNumericalInputElement,
21+
isTextareaElement,
22+
isTextualInputElement,
23+
} from './dom_utils';
1724
import getElementAsTagText from './Util/getElementAsTagText';
1825

1926
export { Component };
@@ -30,6 +37,7 @@ export interface LiveController {
3037
element: HTMLElement;
3138
component: Component;
3239
}
40+
3341
export default class LiveControllerDefault extends Controller<HTMLElement> implements LiveController {
3442
static values = {
3543
name: String,
@@ -429,6 +437,36 @@ export default class LiveControllerDefault extends Controller<HTMLElement> imple
429437

430438
const finalValue = getValueFromElement(element, this.component.valueStore);
431439

440+
if (isTextualInputElement(element) || isTextareaElement(element)) {
441+
if (
442+
modelBinding.minLength !== null &&
443+
typeof finalValue === 'string' &&
444+
finalValue.length < modelBinding.minLength
445+
) {
446+
return;
447+
}
448+
449+
if (
450+
modelBinding.maxLength !== null &&
451+
typeof finalValue === 'string' &&
452+
finalValue.length > modelBinding.maxLength
453+
) {
454+
return;
455+
}
456+
}
457+
458+
if (isNumericalInputElement(element)) {
459+
const numericValue = Number(finalValue);
460+
461+
if (modelBinding.minValue !== null && numericValue < modelBinding.minValue) {
462+
return;
463+
}
464+
465+
if (modelBinding.maxValue !== null && numericValue > modelBinding.maxValue) {
466+
return;
467+
}
468+
}
469+
432470
this.component.set(modelBinding.modelName, finalValue, modelBinding.shouldRender, modelBinding.debounce);
433471
}
434472

‎src/LiveComponent/assets/test/Directive/get_model_binding.test.ts‎

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@@ -4,34 +4,105 @@ import getModelBinding from '../../src/Directive/get_model_binding';
44
describe('get_model_binding', () => {
55
it('returns correctly with simple directive', () => {
66
const directive = parseDirectives('firstName')[0];
7+
78
expect(getModelBinding(directive)).toEqual({
89
modelName: 'firstName',
910
innerModelName: null,
1011
shouldRender: true,
1112
debounce: false,
1213
targetEventName: null,
14+
minLength: null,
15+
maxLength: null,
16+
minValue: null,
17+
maxValue: null,
1318
});
1419
});
1520

1621
it('returns all modifiers correctly', () => {
1722
const directive = parseDirectives('on(change)|norender|debounce(100)|firstName')[0];
23+
1824
expect(getModelBinding(directive)).toEqual({
1925
modelName: 'firstName',
2026
innerModelName: null,
2127
shouldRender: false,
2228
debounce: 100,
2329
targetEventName: 'change',
30+
minLength: null,
31+
maxLength: null,
32+
minValue: null,
33+
maxValue: null,
2434
});
2535
});
2636

2737
it('parses the parent:inner model name correctly', () => {
2838
const directive = parseDirectives('firstName:first')[0];
39+
2940
expect(getModelBinding(directive)).toEqual({
3041
modelName: 'firstName',
3142
innerModelName: 'first',
3243
shouldRender: true,
3344
debounce: false,
3445
targetEventName: null,
46+
minLength: null,
47+
maxLength: null,
48+
minValue: null,
49+
maxValue: null,
50+
});
51+
});
52+
53+
it('parses min_length and max_length modifiers', () => {
54+
const directive = parseDirectives('min_length(3)|max_length(20)|username')[0];
55+
56+
expect(getModelBinding(directive)).toEqual({
57+
modelName: 'username',
58+
innerModelName: null,
59+
shouldRender: true,
60+
debounce: false,
61+
targetEventName: null,
62+
minLength: 3,
63+
maxLength: 20,
64+
minValue: null,
65+
maxValue: null,
66+
});
67+
});
68+
69+
it('parses min_value and max_value modifiers', () => {
70+
const directive = parseDirectives('min_value(18)|max_value(65)|age')[0];
71+
72+
expect(getModelBinding(directive)).toEqual({
73+
modelName: 'age',
74+
innerModelName: null,
75+
shouldRender: true,
76+
debounce: false,
77+
targetEventName: null,
78+
minLength: null,
79+
maxLength: null,
80+
minValue: 18,
81+
maxValue: 65,
82+
});
83+
});
84+
85+
it('handles mixed modifiers correctly', () => {
86+
const directive = parseDirectives('on(change)|norender|debounce(100)|min_value(18)|max_value(65)|age:years')[0];
87+
88+
expect(getModelBinding(directive)).toEqual({
89+
modelName: 'age',
90+
innerModelName: 'years',
91+
shouldRender: false,
92+
debounce: 100,
93+
targetEventName: 'change',
94+
minLength: null,
95+
maxLength: null,
96+
minValue: 18,
97+
maxValue: 65,
3598
});
3699
});
100+
101+
it('handles empty modifier values gracefully', () => {
102+
const directive = parseDirectives('min_length|max_length|username')[0];
103+
const binding = getModelBinding(directive);
104+
105+
expect(binding.minLength).toBeNull();
106+
expect(binding.maxLength).toBeNull();
107+
});
37108
});

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