ngx-treeview/src/treeview-helper.js

An Angular treeview component with checkbox

import { concat, isNil, pull } from 'lodash';
export var TreeviewHelper = {
    findItem: findItem,
    findItemInList: findItemInList,
    findParent: findParent,
    removeItem: removeItem,
    concatSelection: concatSelection
};
function findItem(root, value) {
    if (isNil(root)) {
        return undefined;
    }
    if (root.value === value) {
        return root;
    }
    if (root.children) {
        for (var _i = 0, _a = root.children; _i < _a.length; _i++) {
            var child = _a[_i];
            var foundItem = findItem(child, value);
            if (foundItem) {
                return foundItem;
            }
        }
    }
    return undefined;
}
function findItemInList(list, value) {
    if (isNil(list)) {
        return undefined;
    }
    for (var _i = 0, list_1 = list; _i < list_1.length; _i++) {
        var item = list_1[_i];
        var foundItem = findItem(item, value);
        if (foundItem) {
            return foundItem;
        }
    }
    return undefined;
}
function findParent(root, item) {
    if (isNil(root) || isNil(root.children)) {
        return undefined;
    }
    for (var _i = 0, _a = root.children; _i < _a.length; _i++) {
        var child = _a[_i];
        if (child === item) {
            return root;
        }
        else {
            var parent_1 = findParent(child, item);
            if (parent_1) {
                return parent_1;
            }
        }
    }
    return undefined;
}
function removeItem(root, item) {
    var parent = findParent(root, item);
    if (parent) {
        pull(parent.children, item);
        if (parent.children.length === 0) {
            parent.children = undefined;
        }
        else {
            parent.correctChecked();
        }
        return true;
    }
    return false;
}
function concatSelection(items, checked, unchecked) {
    var checkedItems = checked.slice();
    var uncheckedItems = unchecked.slice();
    for (var _i = 0, items_1 = items; _i < items_1.length; _i++) {
        var item = items_1[_i];
        var selection = item.getSelection();
        checkedItems = concat(checkedItems, selection.checkedItems);
        uncheckedItems = concat(uncheckedItems, selection.uncheckedItems);
    }
    return {
        checked: checkedItems,
        unchecked: uncheckedItems
    };
}
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