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setFocus.ts
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setFocus.ts
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/*
* Copyright 2020 LABOR.digital
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Last modified: 2020.11.24 at 02:08
*/
import {isBrowser} from '../Environment/isBrowser';
import {asArray} from '../FormatAndConvert/asArray';
import {filter} from '../Lists/filter';
import {isFunction} from '../Types/isFunction';
import {isObject} from '../Types/isObject';
/**
* Helper to set the focus of another html element relative to the given pivot element
* @param pivot
* @param offset
*/
function switchFocus(pivot: HTMLElement, offset: number): HTMLElement
{
if (!isBrowser() || !isObject(pivot)) {
return pivot;
}
let elements: any = document.querySelectorAll('input, button, select, textarea, a[href]');
elements = filter(asArray(elements), (e) => e.tabIndex >= 0) as Array<HTMLElement>;
const index = elements.indexOf(pivot);
return focusElement(elements[index + offset] || elements[0]);
}
/**
* Sets the focus on a given html element if possible
* @param target
*/
export function focusElement(target: HTMLElement): HTMLElement
{
if (isObject(target) && isFunction(target.focus)) {
target.focus();
}
return target;
}
/**
* Sets the focus on the next html element relative to the given pivot element if possible
* @param pivot
*/
export function focusNextElement(pivot: HTMLElement): HTMLElement
{
return switchFocus(pivot, 1);
}
/**
* Sets the focus on the previous html element relative to the given pivot element if possible
* @param pivot
*/
export function focusPreviousElement(pivot: HTMLElement): HTMLElement
{
return switchFocus(pivot, -1);
}