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Web Site Development Overview

Web Site Development Overview. Web Site Development Module Overview. Lectures Lecture 1 Web Site Technology Foundation Developing a Web Site HTML Overview Lecture 2 HTML Continued Cascading Style Sheets Labs Lab 1 Basic tools for developing a web site Creating a Home Page using HTML

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Web Site Development Overview

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  1. Web Site DevelopmentOverview

  2. Web Site Development Module Overview • Lectures • Lecture 1 • Web Site Technology Foundation • Developing a Web Site • HTML Overview • Lecture 2 • HTML Continued • Cascading Style Sheets • Labs • Lab 1 • Basic tools for developing a web site • Creating a Home Page using HTML • Lab 2 • More practice with HTML • Extending your web site using Cascading Style Sheets • Semester Project Assignment and Kickoff Lab

  3. Web Site Development • Building and maintaining a web site utilizes the same basic disciplines as developing and maintaining applications programs • Requirements – Defining and gaining agreement on the problem being solved • Design – Deciding on the approach to solving the problem • Development – Building the solution • Testing – Ensuring the solution works under varied conditions • Implementing/Publishing – Making the solution available to the users • Web sites utilize a series of innovations for: • Formatting and presentation of documents (web pages) • Navigating within and between documents

  4. Hypertext • Text that includes links – no single sequential path through or between text documents • Long history that could go back as far as the Talmud • 1945 - Vannar Bush • Described a system for linking microfilm machines • System was called Memex • 1965 Ted Nelson working at SRI • Coined the terms hypertext and hypermedia • 1977 - First hypermedia use was a tour of Aspen • 1983 – Hypermedia development tool available on an Apple II • 1987 – Apple release Hypercards for the Macintosh

  5. Links Can Be Followed Ad Hoc

  6. Markup Languages • A Programming Language is compromised of a set of rules that direct the actions of a computer • A Markup Language is a programming language designed for formatting of “documents” where a document can be any stored file, not just text • The formatting is defined in the document as a series of tags • 1960s – IBM • Standardized General Markup Language (SGML) • Formatting of documents to be printed • Many of the earliest tags still in use in Markup Languages today

  7. There Are a Number of Markup Languages • SGML – Standard General Markup Language • Text document formatting had no hyperlinks • XML – Extensible Markup Language • Language that describes document format and context • Commonly used for inter-program, document exchange • Used in business between companies (or within) for Electronic Data Interchange (EDI) . E.g. to send an invoice to another company’s computer I would encode it in XML. • HTML – Hypertext Markup Language • One of the original languages used to format web pages • XHTML – Extensible Hypertext Markup Language • Strict interpretation of Hypertext rules • All open tags must be closed and tags must be properly nested • Cascading Style Sheets • Allows the separation of formatting from the actual page contents • Uses many HTML concepts, and eclipsing HTML

  8. Hypertext Markup Language (HTML) • The Combination of Hypertext and Markup Languages • Origination credited to physicist Tim Berners-Lee • Working at CERN (European Organization for Nuclear Research) • Looking for method for scientists to share information between networked computers • First used in December 1990 • Using document elements (tags) to link (jump to) related documents within or between computers

  9. Browser • A program that is able to interpret and act on the contents of documents encoded with HTML or other language with a similar intent • 1992 University of Kansas • Lynx browser • Used for student campus information – text only • 1993 University of Illinois • First browser to support both text and graphics information • Mosaic browser whose co-author was Marc Andreesen • 1995 Netscape IPO • Founding members were Jim Clark and Marc Andreesen • Primary products the Netscape browser and web server (based on Mosaic) • 1995 Internet Explorer 1.0 • Initial browser from Microsoft who licensed the software from Spyglass • 1996 Internet Explorer 3.0 • Equivalent Netscape functionality bundled with Windows 95

  10. HTML • HTML is made up of instructions embedded in a document that inform a browser how to treat a document • The instructions are expressed as tags and attributes which further define the tag instruction • HTML tags are: • Delimited by greater and less than symbols < and > e.g. <b> indicates the text that follows is to be bolded • And should generally bounded by open <tag> and close tags </tag> e.g. <b>This text will be in bold</b> • In a few cases there are multiple tags for the same function, e.g. <b>, <em> and <strong> do the same thing. • Attributes further qualify tags that require information <imgsrc=“name”> This tag indicates that an image is to included where src=“name” indicates the location of the image (e.g. file path)

  11. HTML • Basic tag language rules • Whitespace (blanks, new lines) insensitive Hello there is treated the same as He llo the re • Attribute values can be enclosed in single or double quotes (i.e. ‘ or “) • Not all tags require attributes • Not all attributes require quotes • Not all tags require open and close (but generally a a good habit) <p>This is the first paragraph <p>This is the second <p>This is the first paragraph</p> <p>This is the second<p> Will probably be treated the same • Beware: HTML does not do checking for errors – it interprets what it can and ignores the rest. You will need to be the error checker for yourself.

  12. Cascading Style Sheets - CSS • A Style Language that like HTML, describes the look and formatting of documents – the most common of which are web pages • Provides the same types of formatting capabilities as HTML • CSS: • Allows for better separation of document content and formatting information • Can be stored separately from the document’s contents • Can specify different formatting information for different presentation modes (e.g. viewing versus printing) these features: • Allow content developers to focus on content • Facilitate sharing of formatting instructions across documents

  13. Javascript • 1996 - First introduced by Netscape browser Version 2.0 • Code which runs within the client’s browser (on your Mac/PC) • Relatively easy to learn and use • Support by “all” browsers • Allows additional interactive features to users via browsers, e.g. • Forms controls such as field validation • Allowing mouse-rollover to change an object • Popping a new window and controlling the size of the window • Disadvantages • Users can disable • Common carrier for malware

  14. Planning for a Web Site What Do You Think Makes a Good Web Site?

  15. Planning for a Web Site Some considerations: • Be clear on the audience, purpose and requirements • Plan your sites look and feel • Be consistent • Be clear • Use of fonts, color, graphics, sounds and video • Set and test page loading speed for acceptability • Plan the structure and hierarchy of your pages • Within a page • Between pages • Plan your navigation • Within a page • Between pages • Between your site and other sites • Create a mockup and check with users

  16. Process for Developing a Web Site • Complete the planning • Create the web pages using an editor or other tool • There are many editors that assist in creating web pages (free and fee) • We will use the Notepad Accessory which is part of Windows – it doesn’t provide any assistance • Test the web pages locally • Publish the web pages by uploading the pages to the web server • There are many tools available to facilitate the management and uploading of web pages – called content management systems • Commercial web sites: • First publish to test web sites • Ensure that all pages work well on all browsers they intend to support • Test page load times across a variety of user internet connections for acceptability • Tune and retest as needed • Push to the public-facing web sites

  17. A Basic Approach toWriting Code - Programming • Document the problem you want to solve • Sketch out your ideas • Basic flow • Web page or report layouts • Write the code with your tool of choice • Do it incrementally • Testing: • Each new section as you add • Prior sections to ensure you haven’t broken them • Thoroughly test • Test each function • Test the system end to end • If appropriate stress test Your goal is to break your code! • Rather than a user finding your faults • So you can fix it

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