ngx-autosize
Version:
Directive that automatically adjusts textarea height to fit content
188 lines • 26.9 kB
JavaScript
import { HostListener, Directive, Input, Output, EventEmitter } from '@angular/core';
import * as i0 from "@angular/core";
import * as i1 from "./window-ref.service";
const MAX_LOOKUP_RETRIES = 3;
export class AutosizeDirective {
constructor(element, _window, _zone) {
this.element = element;
this._window = _window;
this._zone = _zone;
this.onlyGrow = false;
this.useImportant = false;
this.resized = new EventEmitter();
this.autosize = true;
this.retries = 0;
this._destroyed = false;
if (this.element.nativeElement.tagName !== 'TEXTAREA') {
this._findNestedTextArea();
}
else {
this.textAreaEl = this.element.nativeElement;
this.textAreaEl.style['overflow-y'] = 'hidden';
this._onTextAreaFound();
}
}
set minRows(value) {
this._minRows = +value;
if (this.textAreaEl) {
this.textAreaEl.rows = this._minRows;
}
}
;
set _autosize(autosize) {
this.autosize = typeof autosize === 'boolean'
? autosize
: true;
}
;
onInput(textArea) {
this.adjust();
}
ngOnDestroy() {
this._destroyed = true;
if (this._windowResizeHandler) {
this._window.nativeWindow.removeEventListener('resize', this._windowResizeHandler, false);
}
}
ngAfterContentChecked() {
this.adjust();
}
ngOnChanges(changes) {
this.adjust(true);
}
_findNestedTextArea() {
this.textAreaEl = this.element.nativeElement.querySelector('TEXTAREA');
if (!this.textAreaEl && this.element.nativeElement.shadowRoot) {
this.textAreaEl = this.element.nativeElement.shadowRoot.querySelector('TEXTAREA');
}
if (!this.textAreaEl) {
if (this.retries >= MAX_LOOKUP_RETRIES) {
console.warn('ngx-autosize: textarea not found');
}
else {
this.retries++;
setTimeout(() => {
this._findNestedTextArea();
}, 100);
}
return;
}
this.textAreaEl.style['overflow-y'] = 'hidden';
this._onTextAreaFound();
}
_onTextAreaFound() {
this._addWindowResizeHandler();
setTimeout(() => {
this.adjust();
});
}
_addWindowResizeHandler() {
this._windowResizeHandler = debounce(() => {
this._zone.run(() => {
this.adjust();
});
}, 200);
this._zone.runOutsideAngular(() => {
this._window.nativeWindow.addEventListener('resize', this._windowResizeHandler, false);
});
}
adjust(inputsChanged = false) {
if (this.autosize && !this._destroyed && this.textAreaEl && this.textAreaEl.parentNode) {
const currentText = this.textAreaEl.value;
if (inputsChanged === false &&
currentText === this._oldContent &&
this.textAreaEl.offsetWidth === this._oldWidth) {
return;
}
this._oldContent = currentText;
this._oldWidth = this.textAreaEl.offsetWidth;
const clone = this.textAreaEl.cloneNode(true);
const parent = this.textAreaEl.parentNode;
clone.style.width = this.textAreaEl.offsetWidth + 'px';
clone.style.visibility = 'hidden';
clone.style.position = 'absolute';
clone.textContent = currentText;
parent.appendChild(clone);
clone.style['overflow-y'] = 'hidden';
clone.style.height = 'auto';
let height = clone.scrollHeight;
// add into height top and bottom borders' width
let computedStyle = this._window.nativeWindow.getComputedStyle(clone, null);
height += parseInt(computedStyle.getPropertyValue('border-top-width'));
height += parseInt(computedStyle.getPropertyValue('border-bottom-width'));
if (computedStyle.getPropertyValue('box-sizing') === 'content-box') {
height -= parseInt(computedStyle.getPropertyValue('padding-top'));
height -= parseInt(computedStyle.getPropertyValue('padding-bottom'));
}
const oldHeight = this.textAreaEl.offsetHeight;
const willGrow = height > oldHeight;
if (this.onlyGrow === false || willGrow) {
const lineHeight = this._getLineHeight();
const rowsCount = height / lineHeight;
if (this._minRows && this._minRows >= rowsCount) {
height = this._minRows * lineHeight;
}
else if (this.maxRows && this.maxRows <= rowsCount) {
// never shrink the textarea if onlyGrow is true
const maxHeight = this.maxRows * lineHeight;
height = this.onlyGrow ? Math.max(maxHeight, oldHeight) : maxHeight;
this.textAreaEl.style['overflow-y'] = 'auto';
}
else {
this.textAreaEl.style['overflow-y'] = 'hidden';
}
const heightStyle = height + 'px';
const important = this.useImportant ? 'important' : '';
this.textAreaEl.style.setProperty('height', heightStyle, important);
this.resized.emit(height);
}
parent.removeChild(clone);
}
}
_getLineHeight() {
let lineHeight = parseInt(this.textAreaEl.style.lineHeight, 10);
if (isNaN(lineHeight) && this._window.nativeWindow.getComputedStyle) {
const styles = this._window.nativeWindow.getComputedStyle(this.textAreaEl);
lineHeight = parseInt(styles.lineHeight, 10);
}
if (isNaN(lineHeight)) {
const fontSize = this._window.nativeWindow.getComputedStyle(this.textAreaEl, null).getPropertyValue('font-size');
lineHeight = Math.floor(parseInt(fontSize.replace('px', ''), 10) * 1.5);
}
return lineHeight;
}
}
AutosizeDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.3.1", ngImport: i0, type: AutosizeDirective, deps: [{ token: i0.ElementRef }, { token: i1.WindowRef }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive });
AutosizeDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "13.3.1", type: AutosizeDirective, selector: "[autosize]", inputs: { minRows: "minRows", _autosize: ["autosize", "_autosize"], maxRows: "maxRows", onlyGrow: "onlyGrow", useImportant: "useImportant" }, outputs: { resized: "resized" }, host: { listeners: { "input": "onInput($event.target)" } }, usesOnChanges: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.3.1", ngImport: i0, type: AutosizeDirective, decorators: [{
type: Directive,
args: [{
selector: '[autosize]'
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i1.WindowRef }, { type: i0.NgZone }]; }, propDecorators: { minRows: [{
type: Input
}], _autosize: [{
type: Input,
args: ['autosize']
}], maxRows: [{
type: Input
}], onlyGrow: [{
type: Input
}], useImportant: [{
type: Input
}], resized: [{
type: Output
}], onInput: [{
type: HostListener,
args: ['input', ['$event.target']]
}] } });
function debounce(func, timeout) {
let timer;
return (...args) => {
clearTimeout(timer);
timer = setTimeout(() => {
func(...args);
}, timeout);
};
}
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{\n  ElementRef,\n  HostListener,\n  Directive,\n  Input,\n  NgZone, OnDestroy, OnChanges, AfterContentChecked, Output, EventEmitter, SimpleChanges\n} from '@angular/core';\nimport {WindowRef} from './window-ref.service';\n\nconst MAX_LOOKUP_RETRIES = 3;\n\n@Directive({\n    selector: '[autosize]'\n})\n\nexport class AutosizeDirective implements OnDestroy, OnChanges, AfterContentChecked {\n    @Input()\n    set minRows(value: number) {\n        this._minRows = +value;\n        if (this.textAreaEl) {\n            this.textAreaEl.rows = this._minRows;\n        }\n    };\n    @Input('autosize')\n    set _autosize(autosize: boolean | string) {\n        this.autosize = typeof autosize === 'boolean'\n            ? autosize\n            : true;\n    };\n    private _minRows!: number;\n\n    @Input() maxRows!: number;\n    @Input() onlyGrow = false;\n    @Input() useImportant = false;\n\n    @Output() resized = new EventEmitter<number>();\n\n    private autosize = true;\n    private retries = 0;\n    private textAreaEl: any;\n\n    private _oldContent!: string;\n    private _oldWidth!: number;\n\n    private _windowResizeHandler!: (...args: Array<any>) => any;\n    private _destroyed = false;\n\n    @HostListener('input', ['$event.target'])\n    onInput(textArea: HTMLTextAreaElement): void {\n        this.adjust();\n    }\n\n    constructor(\n        public element: ElementRef,\n        private _window: WindowRef,\n        private _zone: NgZone\n    ) {\n        if (this.element.nativeElement.tagName !== 'TEXTAREA') {\n            this._findNestedTextArea();\n\n        } else {\n            this.textAreaEl = this.element.nativeElement;\n            this.textAreaEl.style['overflow-y'] = 'hidden';\n            this._onTextAreaFound();\n        }\n    }\n\n    ngOnDestroy() {\n        this._destroyed = true;\n        if (this._windowResizeHandler) {\n            this._window.nativeWindow.removeEventListener('resize', this._windowResizeHandler, false);\n        }\n    }\n\n    ngAfterContentChecked() {\n        this.adjust();\n    }\n\n    ngOnChanges(changes: SimpleChanges) {\n        this.adjust(true);\n    }\n\n    _findNestedTextArea() {\n        this.textAreaEl = this.element.nativeElement.querySelector('TEXTAREA');\n\n        if (!this.textAreaEl && this.element.nativeElement.shadowRoot) {\n            this.textAreaEl = this.element.nativeElement.shadowRoot.querySelector('TEXTAREA');\n        }\n\n        if (!this.textAreaEl) {\n            if (this.retries >= MAX_LOOKUP_RETRIES) {\n                console.warn('ngx-autosize: textarea not found');\n\n            } else {\n                this.retries++;\n                setTimeout(() => {\n                    this._findNestedTextArea();\n                }, 100);\n            }\n            return;\n        }\n\n        this.textAreaEl.style['overflow-y'] = 'hidden';\n        this._onTextAreaFound();\n\n    }\n\n    _onTextAreaFound() {\n        this._addWindowResizeHandler();\n        setTimeout(() => {\n            this.adjust();\n        });\n    }\n\n    _addWindowResizeHandler() {\n        this._windowResizeHandler = debounce(() => {\n            this._zone.run(() => {\n                this.adjust();\n            });\n        }, 200);\n\n        this._zone.runOutsideAngular(() => {\n            this._window.nativeWindow.addEventListener('resize', this._windowResizeHandler, false);\n        });\n    }\n\n    adjust(inputsChanged = false): void {\n        if (this.autosize && !this._destroyed && this.textAreaEl && this.textAreaEl.parentNode) {\n\n            const currentText = this.textAreaEl.value;\n\n            if (\n                inputsChanged === false &&\n                currentText === this._oldContent &&\n                this.textAreaEl.offsetWidth === this._oldWidth\n            ) {\n                return;\n            }\n\n            this._oldContent = currentText;\n            this._oldWidth = this.textAreaEl.offsetWidth;\n\n            const clone = this.textAreaEl.cloneNode(true);\n            const parent = this.textAreaEl.parentNode;\n            clone.style.width = this.textAreaEl.offsetWidth + 'px';\n            clone.style.visibility = 'hidden';\n            clone.style.position = 'absolute';\n            clone.textContent = currentText;\n\n            parent.appendChild(clone);\n\n            clone.style['overflow-y'] = 'hidden';\n            clone.style.height = 'auto';\n\n            let height = clone.scrollHeight;\n\n            // add into height top and bottom borders' width\n            let computedStyle = this._window.nativeWindow.getComputedStyle(clone, null);\n            height += parseInt(computedStyle.getPropertyValue('border-top-width'));\n            height += parseInt(computedStyle.getPropertyValue('border-bottom-width'));\n\n            if (computedStyle.getPropertyValue('box-sizing') === 'content-box') {\n                height -= parseInt(computedStyle.getPropertyValue('padding-top'));\n                height -= parseInt(computedStyle.getPropertyValue('padding-bottom'));\n            }\n\n            const oldHeight = this.textAreaEl.offsetHeight;\n            const willGrow = height > oldHeight;\n\n            if (this.onlyGrow === false || willGrow) {\n                const lineHeight = this._getLineHeight();\n                const rowsCount = height / lineHeight;\n\n                if (this._minRows && this._minRows >= rowsCount) {\n                    height = this._minRows * lineHeight;\n\n                } else if (this.maxRows && this.maxRows <= rowsCount) {\n                    // never shrink the textarea if onlyGrow is true\n                    const maxHeight = this.maxRows * lineHeight;\n                    height = this.onlyGrow ? Math.max(maxHeight, oldHeight): maxHeight;\n                    this.textAreaEl.style['overflow-y'] = 'auto';\n\n                } else {\n                    this.textAreaEl.style['overflow-y'] = 'hidden';\n                }\n\n                const heightStyle = height + 'px';\n                const important = this.useImportant ? 'important' : '';\n\n                this.textAreaEl.style.setProperty('height', heightStyle, important);\n\n                this.resized.emit(height);\n            }\n\n            parent.removeChild(clone);\n        }\n    }\n\n    private _getLineHeight() {\n        let lineHeight = parseInt(this.textAreaEl.style.lineHeight, 10);\n        if (isNaN(lineHeight) && this._window.nativeWindow.getComputedStyle) {\n            const styles = this._window.nativeWindow.getComputedStyle(this.textAreaEl);\n            lineHeight = parseInt(styles.lineHeight, 10);\n        }\n\n        if (isNaN(lineHeight)) {\n            const fontSize = this._window.nativeWindow.getComputedStyle(this.textAreaEl, null).getPropertyValue('font-size');\n            lineHeight = Math.floor(parseInt(fontSize.replace('px', ''), 10) * 1.5);\n        }\n\n        return lineHeight;\n    }\n}\n\nfunction debounce<Params extends Array<any>>(func: (...args: Params) => any, timeout: number): (...args: Params) => void {\n  let timer: number;\n  return (...args: Params) => {\n    clearTimeout(timer)\n    timer = setTimeout(() => {\n      func(...args)\n    }, timeout)\n  }\n}\n\n// function Debounce(func: any, wait: number, immediate = false) {\n//     let timeout: number | undefined;\n//     return () => {\n//         const context = this;\n//         const args = arguments;\n//         const later = function () {\n//             timeout = undefined;\n//             if (!immediate) {\n//                 func.apply(this, args);\n//             }\n//         };\n//         const callNow = immediate && !timeout;\n//         clearTimeout(timeout);\n//         timeout = setTimeout(later, wait);\n//         if (callNow) {\n//             func.apply(this, args);\n//         }\n//     };\n// }\n"]}