56 lines
1.7 KiB
JavaScript
56 lines
1.7 KiB
JavaScript
import { nextTick } from 'vue';
|
|
import { obtainAllFocusableElements } from '../../utils/dom/aria.mjs';
|
|
import { EVENT_CODE } from '../../constants/aria.mjs';
|
|
|
|
const FOCUSABLE_CHILDREN = "_trap-focus-children";
|
|
const TRAP_FOCUS_HANDLER = "_trap-focus-handler";
|
|
const FOCUS_STACK = [];
|
|
const FOCUS_HANDLER = (e) => {
|
|
if (FOCUS_STACK.length === 0)
|
|
return;
|
|
const focusableElement = FOCUS_STACK[FOCUS_STACK.length - 1][FOCUSABLE_CHILDREN];
|
|
if (focusableElement.length > 0 && e.code === EVENT_CODE.tab) {
|
|
if (focusableElement.length === 1) {
|
|
e.preventDefault();
|
|
if (document.activeElement !== focusableElement[0]) {
|
|
focusableElement[0].focus();
|
|
}
|
|
return;
|
|
}
|
|
const goingBackward = e.shiftKey;
|
|
const isFirst = e.target === focusableElement[0];
|
|
const isLast = e.target === focusableElement[focusableElement.length - 1];
|
|
if (isFirst && goingBackward) {
|
|
e.preventDefault();
|
|
focusableElement[focusableElement.length - 1].focus();
|
|
}
|
|
if (isLast && !goingBackward) {
|
|
e.preventDefault();
|
|
focusableElement[0].focus();
|
|
}
|
|
}
|
|
};
|
|
const TrapFocus = {
|
|
beforeMount(el) {
|
|
el[FOCUSABLE_CHILDREN] = obtainAllFocusableElements(el);
|
|
FOCUS_STACK.push(el);
|
|
if (FOCUS_STACK.length <= 1) {
|
|
document.addEventListener("keydown", FOCUS_HANDLER);
|
|
}
|
|
},
|
|
updated(el) {
|
|
nextTick(() => {
|
|
el[FOCUSABLE_CHILDREN] = obtainAllFocusableElements(el);
|
|
});
|
|
},
|
|
unmounted() {
|
|
FOCUS_STACK.shift();
|
|
if (FOCUS_STACK.length === 0) {
|
|
document.removeEventListener("keydown", FOCUS_HANDLER);
|
|
}
|
|
}
|
|
};
|
|
|
|
export { FOCUSABLE_CHILDREN, TRAP_FOCUS_HANDLER, TrapFocus as default };
|
|
//# sourceMappingURL=index.mjs.map
|