Asynchronous Javascript and XML
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Applying World Wide Web Standards to Embedded Systems
NASA / TMm2002-211199 AIAA-2001-5107 Embedded Web Technology: Applying World Wide Web Standards to Embedded Systems Joseph G. Ponyik and David W. York Glenn Research Center, Cleveland, Ohio March 2002 The NASA STI Program Office... in Profile Since its founding, NASA has been dedicated to CONFERENCE PUBLICATION. Collected the advancement of aeronautics and space papers from scientific and technical science. The NASA Scientific and Technical conferences, symposia, seminars, or other Information (STI) Program Office plays a key part meetings sponsored or cosponsored by in helping NASA maintain this important role. NASA. The NASA STI Program Office is operated by SPECIAL PUBLICATION. Scientific, Langley Research Center, the Lead Center for technical, or historical information from NASA's scientific and technical information. The NASA programs, projects, and missions, NASA STI Program Office provides access to the often concerned with subjects having NASA STI Database, the largest collection of substantial public interest. aeronautical and space science STI in the world. The Program Office is also NASA's institutional TECHNICAL TRANSLATION. English- mechanism for disseminating the results of its language translations of foreign scientific research and development activities. These results and technical material pertinent to NASA's are published by NASA in the NASA STI Report mission. Series, which includes the following report types: Specialized services that complement the STI TECHNICAL PUBLICATION. Reports of Program Office's diverse offerings include completed research or a major significant creating custom thesauri, building customized phase of research that present the results of data bases, organizing and publishing research NASA programs and include extensive data results.., even providing videos. -
HTML5 and the Open Web Platform
HTML5 and the Open Web Platform Stuttgart 28 May 2013 Dave Raggett <[email protected]> The Open Web Platform What is the W3C? ● International community where Members, a full-time staff and the public collaborate to develop Web standards ● Led by Web inventor Tim Berners-Lee and CEO Jeff Jaffe ● Hosted by MIT, ERCIM, Keio and Beihang ● Community Groups open to all at no fee ● Business Groups get more staff support ● Technical Working Groups ● Develop specs into W3C Recommendations ● Participants from W3C Members and invited experts ● W3C Patent process for royalty free specifications 3 Who's involved ● W3C has 377 Members as of 11 May 2013 ● To name just a few ● ACCESS, Adobe, Akamai, Apple, Baidu, BBC, Blackberry (RIM), BT, Canon, Deutsche Telekom, eBay, Facebook, France Telecom, Fujitsu, Google, Hitachi, HP, Huawei, IBM, Intel, LG, Microsoft, Mozilla, NASA, NEC, NTT DoCoMo, Nuance, Opera Software, Oracle, Panasonic, Samsung, Siemens, Sony, Telefonica, Tencent, Vodafone, Yandex, … ● Full list at ● http://www.w3.org/Consortium/Member/List 4 The Open Web Platform 5 Open Web Platform ● Communicate with HTTP, Web Sockets, XML and JSON ● Markup with HTML5 ● Style sheets with CSS ● Rich graphics ● JPEG, PNG, GIF ● Canvas and SVG ● Audio and Video ● Scripting with JavaScript ● Expanding range of APIs ● Designed for the World's languages ● Accessibility with support for assistive technology 6 Hosted and Packaged Apps ● Hosted Web apps can be directly loaded from a website ● Packaged Web apps can be locally installed on a device and run without the need for access to a web server ● Zipped file containing all the necessary resources ● Manifest file with app meta-data – Old work on XML based manifests (Web Widgets) – New work on JSON based manifests ● http://w3c.github.io/manifest/ ● Pointer to app's cache manifest ● List of required features and permissions needed to run correctly ● Runtime and security model for web apps ● Privileged apps must be signed by installation origin's private key 7 HTML5 Markup ● Extensive range of features ● Structural, e.g. -
Websockets, JSON, HTML, CSS) Webpods When Installed Motivation Create Web Pages to Display Control System Data
Web pods Accessing Control Data Through Web Standards (WebSockets, JSON, HTML, CSS) WebPODS when installed Motivation Create web pages to display control system data WebPODS (Protocol Oriented Distribution Service) • The Web PODS aims to provide real-time publish/subscribe communication using • WebSockets • JSON • Pure HTML/CSS widgets • Main benefits: • Uses web standards (any web client in any language) • Widgets can be configured through standard CSS • Data access outside of control network (possibly WAN) • Web pages do not need to live on the same server where the gateway is Chrome extension: Simple Web Socket Client HTML Probe (Danielle Connolly, UMich) Test javascript client (Danielle Connolly, UMich) Text monitor examples LED examples WebPODS Specify server location Adding text-monitor Adding led Specify color for “LOW” enum value GWT client (Enrique Schuhmacher, BNL) Using CS-Studio off site through Web Pods WebPODS Architecture WebPODS clients WebPODS Server Web Pods server configuration [xxx@diirt ~]# more .diirt/pods/web/mappings.xml <?xml version='1.0' encoding='UTF-8'?> <mappings version="1"> <mapping channel="calibration/constants" substitution="file:///path/to/file/table.csv" permission="READ_ONLY"/> <mapping channel="public-.*" permission="READ_WRITE"/> <mapping channel="cf-tag-(.\w)" substitution="=cfQuery($1)" permission="READ_ONLY"/> <mapping channel="sim/(.*)" substitution="sim://$1" permission="READ_ONLY"/> </mappings> Access security planned, not yet implemented • Use wss (like https) for authentication • Use username/role/unix group/host for authorization Be careful not to expose too much Web Pods • Rebroadcast data using Web sockets and JSON • Play nice with firewalls, get WAN notifications, data available to web tools, server is one class (no logic, a pass-through to pvmanager), should scale (different sockets on different servers, not tested) • Not a substitute to CA/PVA. -
A Light-Weight Time Protocol Based on Common Web Standards
A light-weight time protocol based on common web standards M. Gutbrod, T. Klein, D. Sibold Physikalisch-Technische Bundesanstalt 38116 Braunschweig, Germany [email protected] Abstract—Distributed systems are an essential part of Industry Highest accuracy can be reached by using PTP (Precision 4.0 and IoT. In order to perform properly they depend on time Protocol) if the IT infrastructure fully complies to PTP unambiguous time information while their stripped-down requirements [4]. The current standard only provides an hardware prevents the use of extensive protocols and algorithms. experimental annex for the integrity protection of PTP messages We developed a light-weight protocol for time transmission aiming which was never well adopted and implemented. Thus, the for simplicity, security and broad applicability by relying solely on current effort to revise the PTP specification includes a plan to common web standards. In this paper the new websocket time provide a new security mechanism for PTP. protocol (WST) will be presented. Our aim was to develop a light-weight and secure time Keywords—time protocol, websocket, ntp, time transmission, protocol that is universally usable. Therefore, it is solely based WST on technologies that are available on virtually every IoT device communicating via internet. I. INTRODUCTION The digital transformation is, among others, driven by the II. WEBSOCKET emergence of distributed systems which may for example Websocket was developed to allow efficient bidirectional consist of a large number of sensors performing measuring tasks. communication with low overhead over TCP connections and is In order to correlate their data, it is important that all sensors, or designed to be compatible with the HTTP protocol. -
An Introduction to AJAX
An Introduction to AJAX By : I. Moamin Abughazaleh Page 2 /25 How HTTP works? Classical HTTP Process 1. The visitor requests a page Page 3 /25 2. The server send the entire HTML, CSS and Javascript code at once to the client 3. So, the communication is synchronious Page 4 /25 What is Javascript programming actually? What is Javascript programming? It is programming the browsers. So, we are limited to the objects that the Page 5 /25 browser presents us An Alternative for Managing requests - AJAX AJAX stands for Asynchronous JavaScript And XML. AJAX is based on XMLHttpRequest object of Page 6 /25 Javascript - so the browser and XMLHttpRequest is a standard http://www.w3.org/TR/XMLHttpRequest/ It was introduced with IE-5.0 as an ActiveX object (1999) Later all the major browsers added XMLHttpRequest into their object bases. AJAX = Asynchronous JavaScript and XML It is a technique for creating better, faster, and more interactive web applications With XMLHttpRequest object JavaScript can trade data with a web server, without reloading Page 7 /25 the page AJAX uses “asynchronous data transfer” => allowing web pages to request small bits of information from the server instead of whole pages We can create desktop application like web applications using AJAX, this paradigm is also called “WEB 2.0” programming AJAX - Based on Web Standards AJAX is based on the following web standards: XHTML and CSS Presentation DOM Dynamic display of and interaction with data XML and XSLT Tranfering data back and forth Page 8 /25 XMLHttpRequest Asynchronous transfer of data Javascript Bring these technologies together AJAX applications are browser and platform independent The XMLHttpRequest object is supported in Internet Explorer 5.0+, Safari 1.2, Mozilla 1.0 / Firefox, Opera 8+, and Netscape 7. -
DHTML Effects in HTML Generated from DITA
DHTML Effects in HTML Generated from DITA XML to PDF by RenderX XEP XSL-FO Formatter, visit us at http://www.renderx.com/ 2 | OpenTopic | TOC Contents DHTML Effects in HTML Generated from DITA............................................................3 XML to PDF by RenderX XEP XSL-FO Formatter, visit us at http://www.renderx.com/ OpenTopic | DHTML Effects in HTML Generated from DITA | 3 DHTML Effects in HTML Generated from DITA This topic describes an approach to creating expanding text and other DHTML effects in HTML-based output generated from DITA content. It is common for Help systems to use layering techniques to limit the amount of information presented to the reader. The reader chooses to view the information by clicking on a link. Most layering techniques, including expanding text, dropdown text and popup text, are implemented using Dynamic HTML. Overview The DITA Open Toolkit HTML transformations do not provide for layering effects. However, some changes to the XSL-T files, and the use of outputclassmetadata in the DITA topic content, along with some judicious use of JavaScript and CSS, can deliver these layering effects. Authoring Example In the following example illustrating the technique, a note element is to output as dropdown text, where the note label is used to toggle the display of the note text. The note element is simply marked up with an outputclass distinct attribute value (in this case, hw_expansion). < note outputclass="hw_expansion" type="note">Text of the note</note> Without any modification, the DITA OT will transform the note element to a paragraph element with a CSS class of the outputclass value. -
Web-Based Information Visualisation Using Javascript and Webgl
Eurographics Conference on Visualization (EuroVis) (2014) Short Papers N. Elmqvist, M. Hlawitschka, and J. Kennedy (Editors) FluidDiagrams: Web-Based Information Visualisation using JavaScript and WebGL Keith Andrews1 and Benedict Wright2 1Institute for Information Systems and Computer Media (IICM), Graz University of Technology, Austria 2Institute for Software Technology (IST), Graz University of Technology, Austria Abstract Much attention has been focused on the provision of information graphics and visualisations inside a web browser. Currently available infovis toolkits produce graphical output by either injecting SVG nodes into the DOM or using the JavaScript Canvas 2D API. FluidDiagrams is a prototype information visualisation framework written in JavaScript which uses the WebGL 3D JavaScript API for its output, falling back to Canvas 2D as necessary, via the Three.js library. Six visualisations are currently implemented: bar chart and line chart, scatter plot and parallel coordinates for multidimensional data, and cone tree and hyperbolic for hierarchies. Anecdotally, visualisations using SVG nodes in the DOM for output can become rather sluggish when display- ing more than a few dozen items. Visualisations using Canvas 2D exhibit similarly slow performance. WebGL utilises hardware acceleration where available and promises much better performance for complex visualisations, potentially in the order of many thousands of items without becoming unresponsive. A comparison of parallel coordinates visualisations with 100 records in 20 dimensions compared three imple- mentations: FluidDiagrams (WebGL), FluidDiagrams (Canvas 2D), and D3 (using SVG nodes). They achieved 62, 6, and 10 frames per second respectively. The FluidDiagrams (WebGL) implementation was able to render 1,000 records in 20 dimensions at 18 frames per second, compared to 1 and 6 respectively. -
Introduction to Scalable Vector Graphics
Introduction to Scalable Vector Graphics Presented by developerWorks, your source for great tutorials ibm.com/developerWorks Table of Contents If you're viewing this document online, you can click any of the topics below to link directly to that section. 1. Introduction.............................................................. 2 2. What is SVG?........................................................... 4 3. Basic shapes............................................................ 10 4. Definitions and groups................................................. 16 5. Painting .................................................................. 21 6. Coordinates and transformations.................................... 32 7. Paths ..................................................................... 38 8. Text ....................................................................... 46 9. Animation and interactivity............................................ 51 10. Summary............................................................... 55 Introduction to Scalable Vector Graphics Page 1 of 56 ibm.com/developerWorks Presented by developerWorks, your source for great tutorials Section 1. Introduction Should I take this tutorial? This tutorial assists developers who want to understand the concepts behind Scalable Vector Graphics (SVG) in order to build them, either as static documents, or as dynamically generated content. XML experience is not required, but a familiarity with at least one tagging language (such as HTML) will be useful. For basic XML -
COMP 2145 Web Programming
South Central College COMP 2145 Web Programming Common Course Outline Course Information Description This course covers the popular server-side language PHP and Drupal, a popular CMS (Content Management System). It includes important language concepts such as data types, control statements, debugging techniques, the use of SQL (Standard Query Language). PHP will give the student experience with LAMP (Linux, Apache, MySQL, and PHP) . Prerequisites: COMP1140 - Web Development with a C or higher, or a working knowledge of HTML, CSS, and FTP. COMP1130 - Programming Fundamentals with a C or higher, or a working knowledge of at least one programming language. It is strongly recommended that you have a minimum typing speed of at least 35 wpm as well as a working knowledge of Microsoft Access (COMP1125). Instructional Associate Degree Level Total Credits 4.00 Total Hours 64.00 Types of Instruction Instruction Type Credits/Hours Online/lecture Pre/Corequisites C or better in COMP1140 C or better in COMP1130 or equivalent programming experience Course Competencies 1 Install and use PHP on a local server. Learning Objectives Describe Open Source software and why it is effective for improved software development. Draw a picture describing the relationship between client/server objects used by PHP and mySQL. Common Course Outline September, 2016 Install PHP and mySQL and an Apache web server. Write a simple test program using PHP on the local server (http://localhost/ ) Establish a working environment for PHP web page development. Use variables, constants, and environment variables in a PHP program. 2 Utilize HTML forms and PHP to get information from the user. -
Progressive Imagery with Scalable Vector Graphics -..:: VCG Rostock
Progressive imagery with scalable vector graphics Georg Fuchsa, Heidrun Schumanna, and Ren´eRosenbaumb aUniversity of Rostock, Institute for Computer Science, 18051 Rostock, Germany; bUC Davis, Institute of Data Analysis & Visualization, Davis, CA 95616 U.S.A. ABSTRACT Vector graphics can be scaled without loss of quality, making them suitable for mobile image communication where a given graphics must be typically represented in high quality for a wide range of screen resolutions. One problem is that file size increases rapidly as content becomes more detailed, which can reduce response times and efficiency in mobile settings. Analog issues for large raster imagery have been overcome using progressive refinement schemes. Similar ideas have already been applied to vector graphics, but an implementation that is compliant to a major and widely adopted standard is still missing. In this publication we show how to provide progressive refinement schemes based on the extendable Scalable Vector Graphics (SVG) standard. We propose two strategies: decomposition of the original SVG and incremental transmission using (1) several linked files and (2) element-wise streaming of a single file. The publication discusses how both strategies are employed in mobile image communication scenarios where the user can interactively define RoIs for prioritized image communication, and reports initial results we obtained from a prototypically implemented client/server setup. Keywords: Progression, Progressive refinement, Scalable Vector Graphics, SVG, Mobile image communication 1. INTRODUCTION Vector graphics use graphic primitives such as points, lines, curves, and polygons to represent image contents. As those primitives are defined by means of geometric coordinates that are independent of actual pixel resolutions, vector graphics can be scaled without loss of quality. -
AJAX and Jquery L Raw AJAX Handling in JS Is Very Tedious L Jquery Provides Flexible and Strong Support to Handle AJAX Interactions Through a Set of Jquery Functions
AJAX Asynchronous Design in Web Apps IT 4403 Advanced Web and Mobile Applications Jack G. Zheng Fall 2019 Topics l AJAX concepts and technical elements l AJAX implications and impacts l jQuery AJAX l Basic and shorthand methods l Error handling 2 AJAX l AJAX (Asynchronous JavaScript and XML) is a group of interrelated web development techniques used on the client-side to create interactive web applications. l Despite the name, the use of XML is not actually required, nor do the requests need to be asynchronous. 3 First Impression l https://www.google.com Use Chrome’s developer tools to view network communications while typing the search terms. A set of requests have been made to get JSON data from the server as I type in the search term box. Observe the “q” parameter in all URLs. 4 AJAX Model Difference With Ajax, web applications can communicate with servers in the background without a complete page loading after every request/response cycle. http://www.adaptivepath.com /ideas/ajax-new-approach- web-applications/ 5 Traditional Model The client does not generate views/presentations (HTML/CSS). Synchronous communications feature sequential request/response cycles, one after another The server prepares the whole page. http://www.websiteoptimization.com/secrets/ajax/8-1-ajax-pattern.html 6 Ajax Model l With Ajax, web applications can communicate with servers in the background without a complete page loading after every request/response cycle. The client generates views/presentations and update content (partial page) by manipulating DOM. Asynchronous communications feature independent request/response cycles The server prepares partial pages (partial HTML) or just data (XML or JSON). -
SVG Exploiting Browsers Without Image Parsing Bugs
SVG Exploiting Browsers without Image Parsing Bugs Rennie deGraaf iSEC Partners 07 August 2014 Rennie deGraaf (iSEC Partners) SVG Security BH USA 2014 1 / 55 Outline 1 A brief introduction to SVG What is SVG? Using SVG with HTML SVG features 2 Attacking SVG Attack surface Security model Security model violations 3 Content Security Policy A brief introduction CSP Violations 4 Conclusion Rennie deGraaf (iSEC Partners) SVG Security BH USA 2014 2 / 55 A brief introduction to SVG What is SVG? What is SVG? Scalable Vector Graphics XML-based W3C (http://www.w3.org/TR/SVG/) Development started in 1999 Current version is 1.1, published in 2011 Version 2.0 is in development First browser with native support was Konqueror in 2004; IE was the last major browser to add native SVG support (in 2011) Rennie deGraaf (iSEC Partners) SVG Security BH USA 2014 3 / 55 A brief introduction to SVG What is SVG? A simple example Source code <? xml v e r s i o n = ” 1 . 0 ” encoding = ”UTF-8” standalone = ” no ” ? > <svg xmlns = ” h t t p : // www. w3 . org / 2 0 0 0 / svg ” width = ” 68 ” h e i g h t = ” 68 ” viewBox = ”-34 -34 68 68 ” v e r s i o n = ” 1 . 1 ” > < c i r c l e cx = ” 0 ” cy = ” 0 ” r = ” 24 ” f i l l = ”#c8c8c8 ” / > < / svg > Rennie deGraaf (iSEC Partners) SVG Security BH USA 2014 4 / 55 A brief introduction to SVG What is SVG? A simple example As rendered Rennie deGraaf (iSEC Partners) SVG Security BH USA 2014 5 / 55 A brief introduction to SVG What is SVG? A simple example I am not an artist.