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ng2-parallaxscroll

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A parallax directive for Angular 2+, now with Universal support!

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/** * @fileoverview added by tsickle * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc */ import { Directive, ElementRef, PLATFORM_ID, Inject, Input } from '@angular/core'; import { isPlatformBrowser } from '@angular/common'; export class ParallaxScrollDirective { /** * @param {?} element * @param {?} platformId */ constructor(element, platformId) { this.platformId = platformId; this.axis = 'Y'; this.speed = -.7; this.initialValue = 0; this.cssUnit = 'px'; this.parallaxPivot = '50%'; this.cssProperty = 'backgroundPosition'; this.onScroll = (/** * @return {?} */ () => { /** @type {?} */ let result; /** @type {?} */ let scrollPosition; // Read scroll position * speed + initial val if (this.testBrowser && this.scrollElement instanceof Window) { scrollPosition = this.scrollElement.scrollY * this.speed + this.initialValue; } else { scrollPosition = this.scrollElement.scrollTop * this.speed + this.initialValue; } // Set limits if (this.maxValue !== undefined && scrollPosition >= this.maxValue) { scrollPosition = this.maxValue; } else if (this.minValue !== undefined && scrollPosition <= this.minValue) { scrollPosition = this.minValue; } // Get output based on axis if (this.axis === 'X') { result = 'calc(' + this.parallaxPivot + ' + ' + scrollPosition + this.cssUnit + ') center'; } else { result = 'center calc(' + this.parallaxPivot + ' + ' + scrollPosition + this.cssUnit + ')'; } this.parallaxElement.style[(/** @type {?} */ (this.cssProperty))] = result; }); this.hostElement = element.nativeElement; this.testBrowser = isPlatformBrowser(this.platformId); // If the window exists, grab it, else set to hostElement to prevent errors this.backupElement = this.testBrowser ? window : this.hostElement; } /** * @return {?} */ ngOnInit() { // Read config for (const prop in this.config) { if (this.config.hasOwnProperty(prop)) { ((/** @type {?} */ (this)))[prop] = ((/** @type {?} */ (this.config)))[prop]; } } this.speed = +this.speed; this.initialValue = +this.initialValue; this.parallaxElement = this.parallaxElement || this.hostElement; // Grab scroll element if (this.scrollerId) { try { this.scrollElement = document.getElementById(this.scrollerId); if (!this.scrollElement) { throw new Error((`ID ('${this.scrollerId}') does not exist! Using default`)); } } catch (e) { this.scrollElement = this.backupElement; } } else { this.scrollElement = this.backupElement; } this.onScroll(); this.scrollElement.addEventListener('scroll', this.onScroll.bind(this)); } } ParallaxScrollDirective.decorators = [ { type: Directive, args: [{ // tslint:disable-next-line:directive-selector selector: '[parallax]' },] } ]; /** @nocollapse */ ParallaxScrollDirective.ctorParameters = () => [ { type: ElementRef }, { type: Object, decorators: [{ type: Inject, args: [PLATFORM_ID,] }] } ]; ParallaxScrollDirective.propDecorators = { config: [{ type: Input }], axis: [{ type: Input }], speed: [{ type: Input }], initialValue: [{ type: Input }], maxValue: [{ type: Input }], minValue: [{ type: Input }], cssUnit: [{ type: Input }], scrollerId: [{ type: Input }], parallaxElement: [{ type: Input }], parallaxPivot: [{ type: Input }] }; if (false) { /** * @type {?} * @private */ ParallaxScrollDirective.prototype.config; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.axis; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.speed; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.initialValue; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.maxValue; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.minValue; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.cssUnit; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.scrollerId; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.parallaxElement; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.parallaxPivot; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.cssProperty; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.scrollElement; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.hostElement; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.backupElement; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.testBrowser; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.onScroll; /** * @type {?} * @private */ ParallaxScrollDirective.prototype.platformId; } //# 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{ IParallaxScrollConfig } from './ng2-parallaxscroll';\nimport { Directive, ElementRef, PLATFORM_ID, Inject, Input, OnInit } from '@angular/core';\nimport { isPlatformBrowser } from '@angular/common';\n\n@Directive({\n    // tslint:disable-next-line:directive-selector\n    selector: '[parallax]'\n})\nexport class ParallaxScrollDirective implements OnInit {\n\n    @Input() private config: IParallaxScrollConfig;\n    @Input() private axis: 'X' | 'Y' = 'Y';\n    @Input() private speed = -.7;\n    @Input() private initialValue = 0;\n    @Input() private maxValue: number;\n    @Input() private minValue: number;\n    @Input() private cssUnit = 'px';\n    @Input() private scrollerId: string;\n    @Input() private parallaxElement: HTMLElement;\n    @Input() private parallaxPivot = '50%';\n\n    private cssProperty = 'backgroundPosition';\n    private scrollElement: any;\n    private hostElement: HTMLElement;\n    private backupElement: any;\n    private testBrowser: boolean;\n\n    constructor(\n        element: ElementRef,\n        // tslint:disable-next-line:ban-types\n        @Inject(PLATFORM_ID) private platformId: Object) {\n        this.hostElement = element.nativeElement;\n        this.testBrowser = isPlatformBrowser(this.platformId);\n        // If the window exists, grab it, else set to hostElement to prevent errors\n        this.backupElement = this.testBrowser ? window : this.hostElement;\n    }\n\n    public ngOnInit() {\n        // Read config\n        for (const prop in this.config) {\n            if (this.config.hasOwnProperty(prop)) {\n                (this as any)[prop] = (this.config as any)[prop];\n            }\n        }\n\n        this.speed = +this.speed;\n        this.initialValue = +this.initialValue;\n\n        this.parallaxElement = this.parallaxElement || this.hostElement;\n\n        // Grab scroll element\n        if (this.scrollerId) {\n            try {\n                this.scrollElement = document.getElementById(this.scrollerId);\n                if (!this.scrollElement) {\n                    throw new Error((`ID ('${this.scrollerId}') does not exist! Using default`));\n                }\n            } catch (e) {\n                this.scrollElement = this.backupElement;\n            }\n        } else {\n            this.scrollElement = this.backupElement;\n        }\n\n        this.onScroll();\n\n        this.scrollElement.addEventListener('scroll', this.onScroll.bind(this));\n    }\n\n    private onScroll = () => {\n        let result: string;\n        let scrollPosition: number;\n\n        // Read scroll position * speed + initial val\n        if (this.testBrowser && this.scrollElement instanceof Window) {\n            scrollPosition = this.scrollElement.scrollY * this.speed + this.initialValue;\n        } else {\n            scrollPosition = this.scrollElement.scrollTop * this.speed + this.initialValue;\n        }\n\n        // Set limits\n        if (this.maxValue !== undefined && scrollPosition >= this.maxValue) {\n            scrollPosition = this.maxValue;\n        } else if (this.minValue !== undefined && scrollPosition <= this.minValue) {\n            scrollPosition = this.minValue;\n        }\n\n        // Get output based on axis\n        if (this.axis === 'X') {\n            result = 'calc(' + this.parallaxPivot + ' + ' + scrollPosition + this.cssUnit + ') center';\n        } else {\n            result = 'center calc(' + this.parallaxPivot + ' + ' + scrollPosition + this.cssUnit + ')';\n        }\n\n        this.parallaxElement.style[this.cssProperty as any] = result;\n    }\n}\n"]}