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Echo.js v1.2.0

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Todd Motto 11 years ago
parent
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9 changed files with 187 additions and 245 deletions
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  1. 2
      .editorconfig
  2. 17
      .gitignore
  3. 3
      .jshintrc
  4. 165
      Gruntfile.js
  5. 8
      README.md
  6. 97
      dist/echo.js
  7. 12
      dist/echo.min.js
  8. 37
      package.json
  9. 87
      src/echo.js

2
.editorconfig
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@ -1,5 +1,3 @@
# EditorConfig helps developers define and maintain consistent
# coding styles between different editors and IDEs
# editorconfig.org
root = true

17
.gitignore vendored
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@ -1,4 +1,17 @@
# Node
node_modules
## OS X
.DS_Store
.tmp
.sass-cache
.AppleDouble
.LSOverride
Icon
._*
.Spotlight-V100
.Trashes
## Windows
Thumbs.db
ehthumbs.db
Desktop.ini
$RECYCLE.BIN/

3
.jshintrc
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@ -1,7 +1,6 @@
{
"node": true,
"browser": true,
"es5": true,
"esnext": true,
"bitwise": true,
"camelcase": true,
@ -17,6 +16,6 @@
"undef": true,
"unused": true,
"strict": true,
"trailing": false,
"trailing": true,
"smarttabs": true
}

165
Gruntfile.js
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@ -1,87 +1,104 @@
/*!
* Gruntfile.js configuration
/*
* Gruntfile.js
* @author Todd Motto
* @version 1.0.0
*/
'use strict';
module.exports = function ( grunt ) {
var LIVERELOAD_PORT = 35729;
/*
* Dynamically load the npm tasks
*/
require( 'matchdep' ).filterDev('grunt-*').forEach( grunt.loadNpmTasks );
var lrSnippet = require('connect-livereload')({
port: LIVERELOAD_PORT
});
/*
* Grunt init
*/
grunt.initConfig({
/*
* Grunt JSON for project
*/
pkg: grunt.file.readJSON( 'package.json' ),
/*
* Credit banner
*/
tag: {
banner: "/*!\n" +
" * <%= pkg.title %>\n" +
" * @version <%= pkg.version %>\n" +
" * @author <%= pkg.author[0].name %> <%= pkg.author[1].url %>\n" +
" * Project: <%= pkg.homepage %>\n" +
" *\n" +
" * <%= pkg.description %>\n" +
" * Copyright <%= pkg.year %>." +
" <%= pkg.licenses[0].type %> licensed.\n" +
" */\n"
},
var mountFolder = function (connect, dir) {
return connect.static(require('path').resolve(dir));
};
/*
* jsHint
*/
jshint: {
files: ["src/echo.js"],
options: {
jshintrc: ".jshintrc"
}
},
module.exports = function (grunt) {
/*
* Concat
*/
concat: {
dist: {
src: ["src/echo.js"],
dest: "dist/echo.js"
},
options: {
banner: "<%= tag.banner %>"
}
},
require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);
/*
* UglifyJS
*/
uglify: {
files: {
src: ["dist/echo.js"],
dest: "dist/echo.min.js"
},
options: {
banner: "<%= tag.banner %>"
}
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),
project: { name: 'echo' },
connect: {
options: {
port: 9000,
hostname: 'localhost'
},
livereload: {
options: {
middleware: function (connect) {
return [lrSnippet, mountFolder(connect, 'dist')];
}
}
}
},
tag: {
banner: '/*!\n' +
' * <%= pkg.name %> v<%= pkg.version %>\n' +
' * <%= pkg.description %>\n' +
' * Project: <%= pkg.homepage %>\n' +
' * by <%= pkg.author.name %>: <%= pkg.author.url %>\n' +
' * Copyright.' +
' <%= pkg.licenses[0].type %> licensed.\n' +
' */\n'
},
jshint: {
options: {
jshintrc: '.jshintrc'
},
files: 'src/<%= project.name %>.js',
},
concat: {
dist: {
src: ['src/<%= project.name %>.js'],
dest: 'dist/<%= project.name %>.js'
},
options: {
banner: '<%= tag.banner %>'
}
},
uglify: {
files: {
src: ['dist/<%= project.name %>.js'],
dest: 'dist/<%= project.name %>.min.js'
},
options: {
banner: '<%= tag.banner %>'
}
},
open: {
server: {
path: 'http://localhost:<%= connect.options.port %>'
}
},
watch: {
concat: {
files: 'src/{,*/}*.js',
tasks: ['concat:dist', 'uglify']
},
livereload: {
options: {
livereload: LIVERELOAD_PORT
},
files: [
'{,*/}*.html',
'dist/{,*/}*.js'
]
}
}
});
});
/*
* Register tasks
*/
grunt.registerTask("default", [
"jshint",
"concat",
"uglify"
]);
grunt.registerTask('default' , [
'jshint',
'concat:dist',
'uglify',
'connect:livereload',
'open',
'watch'
]);
};

8
README.md
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@ -1,6 +1,6 @@
# Echo [![Build Status](https://travis-ci.org/toddmotto/echo.png)](https://travis-ci.org/toddmotto/echo)
Echo, simple JavaScript image lazy-loading, no jQuery! Super fast and easy.
Echo is a standalone JavaScript lazy-loading image tool. Echo is fast, less than 1KB and uses HTML5 data-* attributes.
```html
<img src="img/blank.gif" alt="Photo" data-echo="img/photo.jpg">
@ -23,11 +23,15 @@ Drop your files into your required folders, make sure you're using the file(s) f
<body>
<!-- html content above -->
<script src="dist/echo.js"></script>
<script>
// call Echo.js
Echo.init();
</script>
</body>
```
## Configuring Echo
Echo config is super-simple, just add the image that needs to load when visible in a `data-echo` attribute:
Add the image that needs to load when visible in a `data-echo` attribute:
```html
<img src="img/blank.gif" alt="Photo" data-echo="img/photo.jpg">

97
dist/echo.js vendored
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@ -1,92 +1,41 @@
/*!
* Echo
* @version 1.1.0
* @author Todd Motto http://toddmotto.com
* Echo v1.2.0
* Lazy-loading images with data-* attributes
* Project: https://github.com/toddmotto/echo
*
* Raw JavaScript lazy-loading images with HTML5 data-* attributes.
* Copyright 2013. MIT licensed.
* by Todd Motto: http://toddmotto.com
* Copyright. MIT licensed.
*/
window.echo = (function (window, document, undefined) {
window.Echo = (function (window, document, undefined) {
'use strict';
/*
* Constructor function
*/
var Echo = function (elem) {
this.elem = elem;
};
/*
* Images for echoing
*/
var echoStore = [];
var store;
/*
* Element in viewport logic
*/
var scrolledIntoView = function (element) {
var coords = element.getBoundingClientRect();
var _inView = function (img) {
var coords = img.getBoundingClientRect();
return ((coords.top >= 0 && coords.left >= 0 && coords.top) <= (window.innerHeight || document.documentElement.clientHeight));
};
/*
* Changing src attr logic
*/
var echoSrc = function (img, callback) {
img.src = img.getAttribute('data-echo');
if (callback) {
callback();
}
};
/*
* Remove loaded item from array
*/
var removeEcho = function (element, index) {
if (echoStore.indexOf(element) !== -1) {
echoStore.splice(index, 1);
}
};
/*
* Echo the images and callbacks
*/
var echoImages = function () {
for (var i = 0; i < echoStore.length; i++) {
var self = echoStore[i];
if (scrolledIntoView(self)) {
echoSrc(self, removeEcho(self, i));
var _pollImages = function () {
for (var i = 0; i < store.length; i++) {
var self = store[i];
if (_inView(self)) {
self.src = self.getAttribute('data-echo');
if (store.indexOf(self) !== -1) {
store.splice(i, 1);
}
}
}
};
/*
* Prototypal setup
*/
Echo.prototype = {
init : function () {
echoStore.push(this.elem);
}
var init = function () {
store = [].slice.call(document.querySelectorAll('[data-echo]'));
_pollImages();
window.onscroll = _pollImages;
};
/*
* Initiate the plugin
*/
var lazyImgs = document.querySelectorAll('img[data-echo]');
for (var i = 0; i < lazyImgs.length; i++) {
new Echo(lazyImgs[i]).init();
}
/*
* Bind the events
*/
if (document.addEventListener) {
document.addEventListener('DOMContentLoaded', echoImages, false);
} else {
window.onload = echoImages;
}
window.onscroll = echoImages;
return {
init: init
};
})(window, document);

12
dist/echo.min.js vendored
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@ -1,10 +1,8 @@
/*!
* Echo
* @version 1.1.0
* @author Todd Motto http://toddmotto.com
* Echo v1.2.0
* Lazy-loading images with data-* attributes
* Project: https://github.com/toddmotto/echo
*
* Raw JavaScript lazy-loading images with HTML5 data-* attributes.
* Copyright 2013. MIT licensed.
* by Todd Motto: http://toddmotto.com
* Copyright. MIT licensed.
*/
window.echo=function(a,b){"use strict";var c=function(a){this.elem=a},d=[],e=function(c){var d=c.getBoundingClientRect();return(d.top>=0&&d.left>=0&&d.top)<=(a.innerHeight||b.documentElement.clientHeight)},f=function(a,b){a.src=a.getAttribute("data-echo"),b&&b()},g=function(a,b){-1!==d.indexOf(a)&&d.splice(b,1)},h=function(){for(var a=0;a<d.length;a++){var b=d[a];e(b)&&f(b,g(b,a))}};c.prototype={init:function(){d.push(this.elem)}};for(var i=b.querySelectorAll("img[data-echo]"),j=0;j<i.length;j++)new c(i[j]).init();b.addEventListener?b.addEventListener("DOMContentLoaded",h,!1):a.onload=h,a.onscroll=h}(window,document);
window.Echo=function(a,b){"use strict";var c,d=function(c){var d=c.getBoundingClientRect();return(d.top>=0&&d.left>=0&&d.top)<=(a.innerHeight||b.documentElement.clientHeight)},e=function(){for(var a=0;a<c.length;a++){var b=c[a];d(b)&&(b.src=b.getAttribute("data-echo"),-1!==c.indexOf(b)&&c.splice(a,1))}},f=function(){c=[].slice.call(b.querySelectorAll("[data-echo]")),e(),a.onscroll=e};return{init:f}}(window,document);

37
package.json
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@ -1,22 +1,35 @@
{
"name": "Echo",
"title": "Echo",
"description": "Raw JavaScript lazy-loading images with HTML5 data-* attributes.",
"author": [
{ "name" : "Todd Motto" },
{ "url" : "http://toddmotto.com" }
],
"version": "1.2.0",
"homepage": "https://github.com/toddmotto/echo",
"licenses": [
{ "type": "MIT" }
],
"author": "Todd Motto",
"year" : "2013",
"version": "1.1.0",
"description": "Lazy-loading images with data-* attributes",
"author": {
"name": "Todd Motto",
"email": "todd@toddmotto.com",
"url": "http://toddmotto.com",
"github" : "https://github.com/toddmotto"
},
"licenses": [{
"type": "MIT"
}],
"repository": {
"type": "git",
"url": "http://github.com/toddmotto/echo.git"
},
"devDependencies": {
"grunt": "~0.4.1",
"grunt-contrib-jshint": "~0.7.1",
"grunt-contrib-concat": "~0.3.0",
"grunt-contrib-uglify": "~0.2.0",
"grunt-contrib-jshint": "~0.4.3",
"grunt-contrib-uglify": "~0.2.7",
"grunt-contrib-connect": "~0.3.0",
"grunt-contrib-watch": "~0.4.4",
"connect-livereload": "~0.2.0",
"grunt-open": "~0.2.0",
"matchdep": "~0.1.2"
},
"peerDependencies": {
"grunt-cli": "*"
}
}

87
src/echo.js
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@ -1,83 +1,34 @@
window.echo = (function (window, document, undefined) {
window.Echo = (function (window, document, undefined) {
'use strict';
/*
* Constructor function
*/
var Echo = function (elem) {
this.elem = elem;
};
/*
* Images for echoing
*/
var echoStore = [];
var store;
/*
* Element in viewport logic
*/
var scrolledIntoView = function (element) {
var coords = element.getBoundingClientRect();
var _inView = function (img) {
var coords = img.getBoundingClientRect();
return ((coords.top >= 0 && coords.left >= 0 && coords.top) <= (window.innerHeight || document.documentElement.clientHeight));
};
/*
* Changing src attr logic
*/
var echoSrc = function (img, callback) {
img.src = img.getAttribute('data-echo');
if (callback) {
callback();
}
};
/*
* Remove loaded item from array
*/
var removeEcho = function (element, index) {
if (echoStore.indexOf(element) !== -1) {
echoStore.splice(index, 1);
}
};
/*
* Echo the images and callbacks
*/
var echoImages = function () {
for (var i = 0; i < echoStore.length; i++) {
var self = echoStore[i];
if (scrolledIntoView(self)) {
echoSrc(self, removeEcho(self, i));
var _pollImages = function () {
for (var i = 0; i < store.length; i++) {
var self = store[i];
if (_inView(self)) {
self.src = self.getAttribute('data-echo');
if (store.indexOf(self) !== -1) {
store.splice(i, 1);
}
}
}
};
/*
* Prototypal setup
*/
Echo.prototype = {
init : function () {
echoStore.push(this.elem);
}
var init = function () {
store = [].slice.call(document.querySelectorAll('[data-echo]'));
_pollImages();
window.onscroll = _pollImages;
};
/*
* Initiate the plugin
*/
var lazyImgs = document.querySelectorAll('img[data-echo]');
for (var i = 0; i < lazyImgs.length; i++) {
new Echo(lazyImgs[i]).init();
}
/*
* Bind the events
*/
if (document.addEventListener) {
document.addEventListener('DOMContentLoaded', echoImages, false);
} else {
window.onload = echoImages;
}
window.onscroll = echoImages;
return {
init: init
};
})(window, document);

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