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index.js
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index.js
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const behavior = require("../../uswds-core/src/js/utils/behavior");
const validate = require("../../uswds-core/src/js/utils/validate-input");
const debounce = require("../../uswds-core/src/js/utils/debounce");
const { prefix: PREFIX } = require("../../uswds-core/src/js/config");
const selectOrMatches = require("../../uswds-core/src/js/utils/select-or-matches");
const VALIDATE_INPUT =
"input[data-validation-element],textarea[data-validation-element]";
const CHECKLIST_ITEM = `.${PREFIX}-checklist__item`;
// Trigger validation on input change, after a delay
const handleChange = debounce((el) => {
validate(el);
}, 1000);
// Create container to hold aria readout
const createStatusElement = (input) => {
const validationContainer = input.parentNode;
const inputID = input.getAttribute("id");
const statusSummaryID = `${inputID}-sr-summary`;
input.setAttribute("aria-describedby", statusSummaryID);
const statusSummaryContainer = document.createElement("span");
statusSummaryContainer.setAttribute("data-validation-status", "");
statusSummaryContainer.classList.add("usa-sr-only");
statusSummaryContainer.setAttribute("aria-live", "polite");
statusSummaryContainer.setAttribute("aria-atomic", true);
statusSummaryContainer.setAttribute("id", statusSummaryID);
validationContainer.append(statusSummaryContainer);
};
// Set up checklist items with initial aria-label (incomplete) values
const createInitialStatus = (input) => {
const validationContainer = input.parentNode;
const checklistItems = validationContainer.querySelectorAll(CHECKLIST_ITEM);
const validationElement = input.getAttribute("data-validation-element");
input.setAttribute("aria-controls", validationElement);
checklistItems.forEach((listItem) => {
let currentStatus = "status incomplete";
if (input.hasAttribute("data-validation-incomplete")) {
currentStatus = input.getAttribute("data-validation-incomplete");
}
const itemStatus = `${listItem.textContent} ${currentStatus} `;
listItem.setAttribute("tabindex", "0");
listItem.setAttribute("aria-label", itemStatus);
});
};
const enhanceValidation = (input) => {
createStatusElement(input);
createInitialStatus(input);
validate(input);
};
const validator = behavior(
{
"input change": {
[VALIDATE_INPUT](event) {
handleChange(event.target);
},
},
},
{
init(root) {
selectOrMatches(VALIDATE_INPUT, root).forEach((input) =>
enhanceValidation(input)
);
},
}
);
module.exports = validator;