Custom element for handle lazy load images with placeholder img and blur effect. 

Custom element for handle lazy load images with placeholder img and blur effect

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@webharmony/web-lazy-img

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const uglify = require('gulp-uglify-es').default;

const spawn = require('child_process').spawn;

const rollupTypescript = require('rollup-plugin-typescript');

const project = ts.createProject("tsconfig.json");

  spawn('tsc', ['--watch'], spawnOptions);

  spawn('polymer', ['serve'], spawnOptions);

var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {

    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;

    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);

    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;

    return c > 3 && r && Object.defineProperty(target, key, r), r;

import { css, customElement, html, LitElement, property } from 'lit-element';

let WebLazyImg = class WebLazyImg extends LitElement {

        this.intersection = new IntersectionObserver((ent) => {

                this.isVisible = ent[0].isIntersecting;

                this.intersection.unobserve(this);

            this.setAttribute('itemtype', 'schema.org/ImageObject');

    ${this.license ? html `<meta itemprop="license" content="https://creativecommons.org/licenses/by/2.0/"/>` : ''}

    <img class="${this.loaded ? '' : 'preload'}" src="${this.isVisible ? this.src : this.preload}"

      alt="${this.alt}" width="${this.width}" height=${this.height} sizes="${this.sizes}"

      srcset="${this.srcset}" @load=${() => { this.loaded = true; }}

], WebLazyImg.prototype, "preload", void 0);

], WebLazyImg.prototype, "srcset", void 0);

], WebLazyImg.prototype, "sizes", void 0);

], WebLazyImg.prototype, "width", void 0);

], WebLazyImg.prototype, "height", void 0);

], WebLazyImg.prototype, "isVisible", void 0);

], WebLazyImg.prototype, "loaded", void 0);

], WebLazyImg.prototype, "license", void 0);

  "description": "Custom element for handle lazy load images with placeholder img and blur effect",

  "repository": "webharmony/web-lazy-img",

    "test": "echo \"Error: no test specified\" && exit 1",

    "rollup": "rollup --config ./rollup.config.js"

  "homepage": "https://webharmony.dev/components/web-lazy-img",

    "@webcomponents/webcomponentsjs": "^2.2.10",

    "google-closure-compiler-js": "^20190325.0.0",

    "rollup-plugin-node-resolve": "^4.2.3",

    "rollup-plugin-typescript": "^1.0.1",

export class WebLazyImg extends LitElement {

  @property({ type: String }) preload = '';

  @property({ type: String }) srcset = '';

  @property({ type: String }) sizes = '';

  @property({ type: String }) width = 'auto';

  @property({ type: String }) height = 'auto';

  @property({ type: Boolean }) isVisible = false;

  @property({ type: Boolean }) loaded = false;

  @property({ type: Boolean }) license = false;

  private intersection: IntersectionObserver = new IntersectionObserver((ent) => {

      this.isVisible = ent[0].isIntersecting;

      this.setAttribute('itemtype', 'schema.org/ImageObject');

    ${this.license ? html`<meta itemprop="license" content="https://creativecommons.org/licenses/by/2.0/"/>` : ''}

    <img class="${this.loaded ? '' : 'preload'}" src="${ this.isVisible ? this.src : this.preload }"

      srcset="${this.srcset}" @load=${() => {this.loaded = true; }}

		const gulp = require('gulp');
		const uglify = require('gulp-uglify-es').default;
		const spawn = require('child_process').spawn;
		const rollup = require('rollup');
		const rollupTypescript = require('rollup-plugin-typescript');
		const ts = require('gulp-typescript');

		const project = ts.createProject("tsconfig.json");


		gulp.task('serve', () => {
		@@ -30,2 +35,11 @@ const spawnOptions = {

		})
		})

		gulp.task('default', ()=>{
		return project.src()
		.pipe(project())
		.pipe(uglify({

		}))
		.pipe(gulp.dest("lib"))
		});

		@@ -41,2 +41,4 @@ var __decorate = (this && this.__decorate) \|\| function (decorators, target, key, desc) {
		display:block;
		max-width:100%;
		max-height: 100%;
		}
		@@ -67,2 +69,4 @@
		}
		this.style.width = this.width;
		this.style.height = this.height;
		}
		@@ -69,0 +73,0 @@ render() {

		{
		"name": "@webharmony/web-lazy-img",
		"version": "1.2.3",
		"version": "1.2.5",
		"description": "Custom element for handle lazy load images with placeholder img and blur effect",
		@@ -11,3 +11,3 @@ "main": "lib/web-lazy-img.js",
		"tsc:watch": "tsc --watch",
		"serve": "gulp serve",
		"start": "gulp serve",
		"test": "echo \"Error: no test specified\" && exit 1",
		@@ -32,2 +32,5 @@ "lint": "tslint --project ./",
		"gulp": "^4.0.0",
		"gulp-typescript": "^5.0.1",
		"gulp-uglify": "^3.0.2",
		"gulp-uglify-es": "^1.0.4",
		"gulpclass": "^0.2.0",
		@@ -34,0 +37,0 @@ "rollup": "^1.10.0",

		@@ -37,2 +37,4 @@ import { css, customElement, html, LitElement, property } from 'lit-element';
		display:block;
		max-width:100%;
		max-height: 100%;
		}
		@@ -64,2 +66,4 @@
		}
		this.style.width = this.width;
		this.style.height = this.height;
		}
		@@ -66,0 +70,0 @@

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