@qualweb/wcag-techniques
Version:
Implementation of the WCAG 2.1 techniques
61 lines (60 loc) • 2.66 kB
JavaScript
;
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.QW_WCAG_T10 = void 0;
const applicability_1 = require("@qualweb/util/applicability");
const evaluation_1 = require("@qualweb/core/evaluation");
const Technique_object_1 = require("../lib/Technique.object");
class QW_WCAG_T10 extends Technique_object_1.Technique {
execute(element) {
const test = new evaluation_1.Test();
const images = element.getElements('img');
const text = element.getElementText();
const hasImage = images.length > 0;
let hasNonEmptyAlt = false;
let hasAlt = false;
let equalAltText = false;
for (const img of images || []) {
if (img.elementHasAttribute('alt') && !hasNonEmptyAlt && !equalAltText) {
hasAlt = true;
const alt = img.getElementAttribute('alt');
if (alt !== null) {
hasNonEmptyAlt = alt.trim() !== '';
equalAltText = !!text && alt.trim() === text.trim();
}
}
}
if (!hasImage || !hasAlt || !text || text.trim() === '') {
return;
}
else if (!hasNonEmptyAlt) {
test.verdict = evaluation_1.Verdict.PASSED;
test.resultCode = 'P1';
}
else if (equalAltText) {
test.verdict = evaluation_1.Verdict.FAILED;
test.resultCode = 'F1';
}
else {
test.verdict = evaluation_1.Verdict.WARNING;
test.resultCode = 'W1';
}
test.addElement(element);
this.addTestResult(test);
}
}
exports.QW_WCAG_T10 = QW_WCAG_T10;
__decorate([
applicability_1.ElementExists,
__metadata("design:type", Function),
__metadata("design:paramtypes", [Function]),
__metadata("design:returntype", void 0)
], QW_WCAG_T10.prototype, "execute", null);