62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', { value: true });
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var vue = require('vue');
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var aria = require('../../utils/dom/aria.js');
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var aria$1 = require('../../constants/aria.js');
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const FOCUSABLE_CHILDREN = "_trap-focus-children";
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const TRAP_FOCUS_HANDLER = "_trap-focus-handler";
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const FOCUS_STACK = [];
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const FOCUS_HANDLER = (e) => {
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if (FOCUS_STACK.length === 0)
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return;
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const focusableElement = FOCUS_STACK[FOCUS_STACK.length - 1][FOCUSABLE_CHILDREN];
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if (focusableElement.length > 0 && e.code === aria$1.EVENT_CODE.tab) {
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if (focusableElement.length === 1) {
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e.preventDefault();
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if (document.activeElement !== focusableElement[0]) {
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focusableElement[0].focus();
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}
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return;
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}
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const goingBackward = e.shiftKey;
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const isFirst = e.target === focusableElement[0];
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const isLast = e.target === focusableElement[focusableElement.length - 1];
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if (isFirst && goingBackward) {
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e.preventDefault();
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focusableElement[focusableElement.length - 1].focus();
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}
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if (isLast && !goingBackward) {
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e.preventDefault();
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focusableElement[0].focus();
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}
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}
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};
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const TrapFocus = {
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beforeMount(el) {
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el[FOCUSABLE_CHILDREN] = aria.obtainAllFocusableElements(el);
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FOCUS_STACK.push(el);
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if (FOCUS_STACK.length <= 1) {
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document.addEventListener("keydown", FOCUS_HANDLER);
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}
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},
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updated(el) {
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vue.nextTick(() => {
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el[FOCUSABLE_CHILDREN] = aria.obtainAllFocusableElements(el);
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});
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},
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unmounted() {
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FOCUS_STACK.shift();
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if (FOCUS_STACK.length === 0) {
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document.removeEventListener("keydown", FOCUS_HANDLER);
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}
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}
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};
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exports.FOCUSABLE_CHILDREN = FOCUSABLE_CHILDREN;
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exports.TRAP_FOCUS_HANDLER = TRAP_FOCUS_HANDLER;
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exports["default"] = TrapFocus;
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//# sourceMappingURL=index.js.map
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