30. April 2016

Flexible JavaScript charting with Canvas using Chart.js

Visualize your data in 8 different ways; each of them animated and customizable.
Great rendering performance across all modern browsers (IE9+)
Redraws charts on window resize for perfect scale granularity.

<canvas id="myChart" width="400" height="400"></canvas>

1	<canvas id="myChart" width="400" height="400"></canvas>

// Any of the following formats may be used
var ctx = document.getElementById("myChart");
var ctx = document.getElementById("myChart").getContext("2d");
var ctx = $("#myChart");

// Any of the following formats may be used

var ctx = document.getElementById("myChart");

var ctx = document.getElementById("myChart").getContext("2d");

var ctx = $("#myChart");

<canvas id="myChart" width="400" height="400"></canvas>
<script>
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
        datasets: [{
            label: '# of Votes',
            data: [12, 19, 3, 5, 2, 3]
        }]
    },
    options: {
        scales: {
            yAxes: [{
                ticks: {
                    beginAtZero:true
                }
            }]
        }
    }
});
</script>

var ctx = document.getElementById("myChart");

var myChart = new Chart(ctx, {

type: 'bar',

data: {

labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],

datasets: [{

label: '# of Votes',

data: [12, 19, 3, 5, 2, 3]

}]

options: {

scales: {

yAxes: [{

ticks: {

beginAtZero:true

}

}]

}

});

</script>

GitHub

18. April 2016

Be amazed by the Responsive Filemanager with Adobe Aviary integration

“Responsive FileManager is a free open-source file manager and image manager made with jQuery, CSS3, PHP and HTML5 that offers a nice and elegant way to upload and insert files, images and videos.
You can use it as external plugin for TinyMCE, CKEditor and CLEditor or as a stand-alone file manager to manage and select files.”

USAGE WITH TINYMCE

tinymce.init({
    selector: "textarea",theme: "modern",width: 680,height: 300,
    plugins: [
         "advlist autolink link image lists charmap print preview hr anchor pagebreak",
         "searchreplace wordcount visualblocks visualchars insertdatetime media nonbreaking",
         "table contextmenu directionality emoticons paste textcolor responsivefilemanager code"
   ],
   toolbar1: "undo redo | bold italic underline | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | styleselect",
   toolbar2: "| responsivefilemanager | link unlink anchor | image media | forecolor backcolor  | print preview code ",
   image_advtab: true ,
   
   external_filemanager_path:"/filemanager/",
   filemanager_title:"Responsive Filemanager" ,
   external_plugins: { "filemanager" : "/filemanager/plugin.min.js"}
 });

tinymce.init({

selector: "textarea",theme: "modern",width: 680,height: 300,

plugins: [

"advlist autolink link image lists charmap print preview hr anchor pagebreak",

"searchreplace wordcount visualblocks visualchars insertdatetime media nonbreaking",

"table contextmenu directionality emoticons paste textcolor responsivefilemanager code"

toolbar1: "undo redo | bold italic underline | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | styleselect",

image_advtab: true ,

external_filemanager_path:"/filemanager/",

filemanager_title:"Responsive Filemanager" ,

external_plugins: { "filemanager" : "/filemanager/plugin.min.js"}

});

Responsive filemanager / GitHub

16. April 2016

Docker layouts with GoldenLayout

GoldenLayout is a web based docker layout engine that aids in creating flexible user interfaces by enabling panels to be docked on the screen.

Native popup windows
Completely themeable
Comprehensive API
Powerful persistence
Works in IE8+, Firefox, Chrome

GitHub & Demo

12. April 2016

Cross browser audio/video/screen recording via webRTC – MediaStreamRecorder

MediaStreamRecorder.js is a cross-browser implementation to record audio & video streams via WebRTC. The lib allows you to submit/upload recorded blobs in realtime to your server.

Record audio+video in Chrome

<script src="https://cdn.webrtc-experiment.com/MediaStreamRecorder.js"> </script>
<script>
var mediaConstraints = {
    audio: true,
    video: true
};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {
    var multiStreamRecorder = new MultiStreamRecorder(stream);
    multiStreamRecorder.video = yourVideoElement; // to get maximum accuracy
    multiStreamRecorder.audioChannels = 1;
    multiStreamRecorder.ondataavailable = function (blobs) {
        // blobs.audio
        // blobs.video
    };
    multiStreamRecorder.start(3 * 1000);
}

function onMediaError(e) {
    console.error('media error', e);
}
</script>

var mediaConstraints = {

audio: true,

video: true

};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {

var multiStreamRecorder = new MultiStreamRecorder(stream);

multiStreamRecorder.video = yourVideoElement; // to get maximum accuracy

multiStreamRecorder.audioChannels = 1;

multiStreamRecorder.ondataavailable = function (blobs) {

// blobs.audio

// blobs.video

};

multiStreamRecorder.start(3 * 1000);

}

function onMediaError(e) {

console.error('media error', e);

}

</script>

Uploading and receiving via PHP

<?php
foreach(array('video', 'audio') as $type) {
    if (isset($_FILES["${type}-blob"])) {

        $fileName = $_POST["${type}-filename"];
        $uploadDirectory = "uploads/$fileName";

        if (!move_uploaded_file($_FILES["${type}-blob"]["tmp_name"], $uploadDirectory)) {
            echo("problem moving uploaded file");
        }

        echo($uploadDirectory);
    }
}
?>

<?php

foreach(array('video', 'audio') as $type) {

if (isset($_FILES["${type}-blob"])) {

$fileName = $_POST["${type}-filename"];

$uploadDirectory = "uploads/$fileName";

if (!move_uploaded_file($_FILES["${type}-blob"]["tmp_name"], $uploadDirectory)) {

echo("problem moving uploaded file");

}

echo($uploadDirectory);

}

API documentation / GitHub

10. April 2016

Take a screenshot of a DOM container and use it as a background image

I am currently developing a drag and drop interface for a course builder. Courses are split into lessons and lessons into slides. While switching between slides, I wanted to have a small thumbnail representing the current slide content.

One option would have been to use something like PhantomJS / CasperJS. A headless browser , to take a screenshot of the slide. I have done that in the past and it works perfectly.

This time, I decided to go with another solution, that allows me to convert html to a canvas element.

The project is called html2canvas (GitHub).

“This script allows you to take screenshots of webpages or parts of it, directly on the users browser. The screenshot is based on the DOM and as such may not be 100% accurate to the real representation as it does not make an actual screenshot, but builds the screenshot based on the information available on the page.”

EXAMPLE

html2canvas(document.body, {
  onrendered: function(canvas) {
    document.body.appendChild(canvas);
  }
});

html2canvas(document.body, {

onrendered: function(canvas) {

document.body.appendChild(canvas);

}

});

CANVAS TO BACKGROUND IMAGE

I have a slide container (#slideContainer), that holds the active slide for editing and a thumb navigation to switch between slides (.slide.thumb).

var current = $(".slide.thumb.active");

html2canvas($("#slideContainer").get(0), {
  onrendered: function(canvas) {
	  
   var dataURL = canvas.toDataURL();
   current.css({"background" :"url("+dataURL+")", 
                "background-size":"contain", 
                "background-position": "center",
                "background-repeat":"no-repeat"});
  }
});

var current = $(".slide.thumb.active");

html2canvas($("#slideContainer").get(0), {

onrendered: function(canvas) {

var dataURL = canvas.toDataURL();

current.css({"background" :"url("+dataURL+")",

"background-size":"contain",

"background-position": "center",

"background-repeat":"no-repeat"});

}

});

When switching between slides, I am doing a snapshot of the current slideContainer and add it as a new background image to the thumb navigation item for that slide. This is done with canvas.toDataURL() and by embedding the resulting image using a data: url.

Works perfectly. html2canvas has no full css support, so the output will not always match 100%, but its close enough to get a glimpse of what is stored per slide ;)

html2canvas
PhantomJS
CasperJS

Enjoy coding …

7. April 2016

to-markdown – Node.js HTML to Markdown converter

An HTML to Markdown converter written in JavaScript.

var toMarkdown = require('to-markdown');
toMarkdown('<h1>Hello world!</h1>');

1 2	var toMarkdown = require('to-markdown'); toMarkdown('<h1>Hello world!</h1>');

GitHub

7. April 2016

Scroll to the top of the page

$("a[href='#top']").click(function() {
  $("html, body").animate({ scrollTop: 0 }, "slow");
  return false;
});

$("a[href='#top']").click(function() {

$("html, body").animate({ scrollTop: 0 }, "slow");

return false;

});

Enjoy coding…

7. April 2016

Crossbrowser jQuery plugin for blurring images

Background Blur plugin is a cross browser jQuery plugin for blurring images.

$('#some-element').backgroundBlur({
    imageURL : 'http://URL-of-the-image',
    blurAmount : 50,
    imageClass : 'bg-blur'
    duration: 1000, // If the image needs to be faded in, how long that should take
    endOpacity : 1 // Specify the final opacity that the image will have
});

$('#some-element').backgroundBlur({

imageURL : 'http://URL-of-the-image',

blurAmount : 50,

imageClass : 'bg-blur'

duration: 1000, // If the image needs to be faded in, how long that should take

endOpacity : 1 // Specify the final opacity that the image will have

});

Demo + GitHub

2. April 2016

Dragging like a Pro with Dragdealer.js

Dragdealer.js is a drag-based JavaScript component, embracing endless UI solutions.

The lib provides a huge amount of options to use it for a multitude of functions.

GitHub

1. April 2016

Simple function to check for a partial key in an Array

This is a simple loop to check for a partial key in an Array

/**
 * Extend the Array object
 * @param searchValue is the string to search for
 * @returns Returns all matches
*/

Array.prototype.searchFor = function(searchValue) {
   
 var pattern = new RegExp('^'+searchValue+'');
 var matches = [];
 
 for (var key in this) {    	
  if (pattern.test(key)) {
    matches.push(key);        	
  }    			
 }
 return matches;
};

/**

* Extend the Array object

* @param searchValue is the string to search for

* @returns Returns all matches

Array.prototype.searchFor = function(searchValue) {

var pattern = new RegExp('^'+searchValue+'');

var matches = [];

for (var key in this) {

if (pattern.test(key)) {

matches.push(key);

}

return matches;

};

Use it like this

var searchValue = "checkForMe";
var searchArray = [];
var matches = searchArray.searchFor(searchValue);

var searchValue = "checkForMe";

var searchArray = [];

var matches = searchArray.searchFor(searchValue);

I am using something similar to look though a huge word/key index and output matching keys that link to a Data object.