92 lines
2.6 KiB
TypeScript
92 lines
2.6 KiB
TypeScript
// (C) Copyright 2015 Moodle Pty Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import { Directive, Input, ElementRef, AfterViewInit } from '@angular/core';
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import { CoreDomUtils } from '@services/utils/dom';
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import { CoreUtils } from '@services/utils/utils';
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/**
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* Directive to auto focus an element when a view is loaded.
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*
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* The value of the input will decide if show keyboard when focusing the element (only on Android).
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* In case value is nofocus, the directive is disabled.
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*
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* <ion-input [core-auto-focus]="showKeyboard">
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*/
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@Directive({
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selector: '[core-auto-focus]',
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})
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export class CoreAutoFocusDirective implements AfterViewInit {
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@Input('core-auto-focus') autoFocus: boolean | string = true;
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protected element: HTMLElement;
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constructor(element: ElementRef) {
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this.element = element.nativeElement;
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}
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/**
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* @inheritdoc
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*/
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ngAfterViewInit(): void {
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if (CoreUtils.isFalseOrZero(this.autoFocus)) {
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return;
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}
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this.setFocus();
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}
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/**
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* Function to focus the element.
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*
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* @param retries Internal param to stop retrying on 0.
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*/
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protected setFocus(retries = 10): void {
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if (retries == 0) {
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return;
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}
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// Wait a bit to make sure the view is loaded.
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setTimeout(() => {
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// If it's a ion-input or ion-textarea, search the right input to use.
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let element: HTMLElement | null = null;
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if (this.element.tagName == 'ION-INPUT') {
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element = this.element.querySelector('input');
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} else if (this.element.tagName == 'ION-TEXTAREA') {
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element = this.element.querySelector('textarea');
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} else {
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element = this.element;
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}
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if (!element) {
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this.setFocus(retries - 1);
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return;
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}
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CoreDomUtils.focusElement(element);
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if (element != document.activeElement) {
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this.setFocus(retries - 1);
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return;
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}
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}, 200);
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}
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}
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