Getting Started with Web

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Published on February 16, 2014

Author: AkshayMathur7

Source: slideshare.net

Description

This is the content of first workshop os a 3 workshop series for learning to create Single Page Web Apps.

This focuses on introducing the HTML, CSS and Javascript to the newbies.

Getting Started with Web Akshay Mathur

Ground Rules • Post on FB and Tweet now • Disturb Everyone during the session – Not by phone rings – Not by local talks – By more information and questions @akshaymathu 2

Let’s Know Each Other • • • • • • • Do you code? OS? Programing Language? HTML? Javascript? JSON? Why are you attending? @akshaymathu 3

Akshay Mathur • Founding Team Member of – ShopSocially (Enabling “social” for retailers) – AirTight Neworks (Global leader of WIPS) • 15+ years in IT industry – Currently Principal Architect at ShopSocially – Mostly worked with Startups • From Conceptualization to Stabilization • At different functions i.e. development, testing, release • With multiple technologies @akshaymathu 4

What is Web?

The Web • Many computers world wide connect to each other • Information stored in one computer can be viewed from other computer @akshaymathu 6

Involved Software Web Browser Core Engine Web Server Web Server Application Server DOM Renderer Database Server Message Queuing Server Task Workers JavaScript Runtime Caching Engine

The Evolution @akshaymathu 8

Web 1.0 - Static • Static pages – Were Read Only and B&W – Colors and other simple formatting came in • Input Forms – Came in just for data collection to start with – Server side response based on input came in @akshaymathu 9

Web 1.0 - Dynamic • Client Side Dynamism – With DHTML, color changing web pages became popular – Changing other basic properties of the text also became possible • Server Side Dynamism – Dynamically generated pages made the web responsive to inputs – Embedded scripting languages gave it a boost @akshaymathu 10

Web 2.0: The Power • Changing part of the webpage – Programmatically reading and writing DOM elements – Rich event handling • Communicating with server without refreshing entire page – AJAX @akshaymathu 11

Understanding URL https://sub.domain.com:8086/a/folder/file.html?key=val&ke y=val2#some_place • • • • • • • Protocol Sub-domain, Domain and TLD Port Path File Query string Fragment @akshaymathu 12

Understanding Web Page

Overall Structure @akshaymathu 14

Doctype and DTD • Tell browser what standards this document is following – How to parse • HTML or XHTML • HTML version 1.0 or 1.1 – Show strict errors or not <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/x html1-transitional.dtd"> @akshaymathu 15

Html • Only the content within <html> and </html> is parsed • xmlns tells where the tags being used in the document are described • Multiple xmlns attributes can be used <html xmlns:fb="http://ogp.me/ns /fb#" xmlns="http://www.w3.org/1 999/xhtml"> @akshaymathu 16

Head • Typically Contains invisible items – Title – Meta – Link – Script – Style @akshaymathu 17

Title • Title of the page • Shows up on title bar of browser <title>ShopSocially Amplify</title> | Engage Convert @akshaymathu 18

Meta • Additional metadata of the page • Multiple meta tags can be used <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="keywords" content="social platform, conversion"> <meta property="fb:app_id" content="213036345945"> @akshaymathu 19

Content Type • Tells browser how to parse and execute the content – Character set info is also incuded <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> • ‘text/html’ is used for HTML pages – A few others are text/csv, application/pdf etc. @akshaymathu 20

Link • Link to external files • Typically used for CSS @akshaymathu 21

Script • Tells browser that the content is an executable script – Javascript, vbscript etc. @akshaymathu 22

Style • Embeds CSS on the page <style type="text/css"> .fb_reset div{overflow:hidden} .fb_link img{border:none} </style> @akshaymathu 23

Body • Contains all visible elements • Different elements can be used for laying out the page – Look and feel can be controlled by style elements – Some elements can not contain anything inside them e.g. input, br etc. @akshaymathu 24

HTML Tags

Types • Containers – Have opening and closing tags of same name – ‘/’ is used for closing e.g. <html>…</html> • Non-containers – Don’t have a closing tag – ‘/’ is used at the end of same tag for closing e.g. <br />, <input type=“text” /> @akshaymathu 26

Display • Block – Take up complete available width by default – Consecutive elements stack vertically • Inline – Take up width only equal to the content – Consecutive elements stack horizontally – Typically word-wrap @akshaymathu 27

Writing Text • Text can be written directly in body • It is a good to have it in blocks – <p>…</p> • Block display • Some default style – <div>…</div> • Block display • No default style – <span>…</span> • Inline display • No default style @akshaymathu 28

Headings • Preformatted text size – Seven sizes are available i.e. h1 … h7 – Defaults can be overridden by CSS • Important for SEO <h1>This is heading</h1> @akshaymathu 29

Bulleted List • Can be un-ordered (<ul>) or numbered (<ol>) • List items (<li>) are shown indented • Can be multilevel and mixed <ol> <li>item1</li> <ul> <li>sub item1</li> </ul> </ol> @akshaymathu 30

Taking Input via Form Elements • • • • • • • Text box: <input type=“text” /> Radio button: <input type=“radio” /> Check box: <input type=“checkbox” /> Button: <input type=“button” /> Hidden: <input type=“hidden” /> Multiline Text box: <textarea></textarea> Dropdown/List: <select> <option>…</option> … </select> @akshaymathu 31

Styling Elements

Making it Look Different • Look can be defined in style attribute of an element <h3 style=“color: #aaa; background-color: #eee; font-size: 16px; width: 100%; padding: 5px;>This is Heading3 as I want</h3> @akshaymathu 33

Font • Font-face – Name of font to be used • Font-family – Multiple font names in order • Font-size – Text size in any unit i.e. px, percentage, em • Font-weight – Bold or regular @akshaymathu 34

Changing Colors • Color value can be specified in many ways – Hex RGB is mostly used i.e. #rrggbb • Background-color – Specifies color of background fill • Color – Specifies color of text • Border-color – Specifies color of border line @akshaymathu 35

Box Model • • • • • • • • Width Padding Border Margin Position Z-index Top/Bottom Left/Right @akshaymathu 36

Where to write style? • Inline – As ‘style’ attribute of an element • Style block – On page in <style>…</style> block • CSS file – In an external file • This is also the preference order for applying style @akshaymathu 37

Defining CSS • Multiple styling properties can be grouped together • Element(s) where to apply style is determined by CSS selector – Multiple CSS selectors may refer to an element • All properties are applied to the element @akshaymathu 38

CSS Selectors • Tag name a {color: blue;} • ID #my_unique_a {color: red;} • Class .common_class {color:#ccc; margin:5px;} • Compound .common_class a {color: green;} • Psudo a:hover, a:visited {color: #ccc;} @akshaymathu 39

CSS Frameworks • Provide ready-to-use collection of classes for common requirements – Grid – Navigation bars – Form elements – Buttons –… • Bootstrap is the great one @akshaymathu 40

@akshaymathu 41

JavaScript

JavaScript • • • • • • • Born in 1995 at Netscape Not at all related to Java Syntax influenced by C Interpreted ECMA scripting lanuage Dynamically typed Object Oriented as well as Functional Prototype based @akshaymathu 43

Javascript • Object Oriented – But different from other OO languages • Single threaded • Runs in its sandbox – Has full access to the objects on the page – Has restricted access to other pages or client machine file-system @akshaymathu 44

Typical Usage • Web programing – Client side • Web pages • Browser plugins – Server side • SSJS (not in use) • NodeJS • PDF documents • Desktop Widgets • MongoDB @akshaymathu 45

JavaScript Language Reference

Comments • Single line – Starts with // – Can also be used after a statement • Multi line – Starts with /* and ends with */ @akshaymathu 47

Statements • Case sensitive • Ignore whitespace • Semicolon (;) is used as delimiter for statements • Block of statements is delimited by curly braces ({}) @akshaymathu 48

Output • Visible to all using DOM functions document.write(„Hello‟); alert(„How are you‟); • For developers in console console.log(“This is working”); @akshaymathu 49

Variable • Explicitly defining is optional – JS runtime automatically defines as needed – Defining all variables with ‘var’ keyword is good • Loosely typed – No need to define the type (int, str etc.) • Dynamically typed – Type changes at runtime as the value changes var my_var = „Hello‟; my_var = 6; @akshaymathu 50

Data Types • • • • • • • • • String: “1”, “Hello! How are you” Number: 1, 2, 121.22 Boolean: true, false Array: [1, “1”, false, {a: 10}] Object: {lang: “JS”, val: my_var} Null: null Undefined: undefined Functions: function(){} Date: Mon, 23 Sep 2013 12:18:54 GMT typeof “1” // String @akshaymathu 51

Operators • Arithmetic +, -, *, /, %, ++, -- • Assignment =, +=, -=, *=, /=, %= • Concatenation + • Comparison ==, ===, !=, !==, >, <, <=, >= • Logical &&, ||, ! • Conditional () ? : @akshaymathu 52

Conditional Blocks • If… else if … else If (age > 18){ can_vote = true; } else { can_vote = false; } Or can_vote = (age>18) ? true : false; @akshaymathu 53

For Loop • For for (i=0; i<array.length; i++){ console.log(array[i]); } • For/in for (item in array){ console.log(item); } @akshaymathu 54

While Loop • While while (is_extra_water){ drain(); } • Do/while do { drain(); } while (is_extra_water); @akshaymathu 55

JS Functions

Function • Code block that executes on ‘call’ //define the function function say_hello(name){ alert(„Hello! „ + name); } //call the function say_hello(„Akshay‟); @akshaymathu 57

Function Arguments • Any number of arguments can be passed without declaring • Named arguments are not supported say_hello(1); // Hello! 1 say_hello(); // Hello! undefined say_hello(„Akshay‟, „Mathur‟); //Hello! Akshay @akshaymathu 58

Naming a Function function my_func(){} • A function may not have a name function(){}; my_func = function(){}; @akshaymathu 59

Variable Scope • By default all variables are global • Variables defined with ‘var’ keyword are local to the function • It is assumed that all variables are defined in the first line function(){ var my_var = „Hello‟; console.log(msg); var2 = 6; } @akshaymathu 60

Return Values • Anything can be returned from a function using return statement function sqr(x){ var sq = x * x; return sq; } var four_sq = sqr(4); @akshaymathu 61

Other Facts • A function can be assigned to a variable • A function can be defined within another function • A function can return a function function sqr(){ sq = function (x){ return x * x * x; }; return sq; } My_sqr = sqr(); // function My_sqr(3); // 27 @akshaymathu 62

Global Functions • encodeURI(), encodeURIComponent() Encodes a URI • • • decodeURI(), decodeURIComponent() Decodes a URI • • • escape() Encodes a string unescape() Decodes an • String() Converts an object's value to a string Number() Converts an object's value to a number • • a value is a finite, legal number isNaN() Determines whether a value is an illegal number parseInt() Parses a string and returns an integer parseFloat() Parses a string and returns a floating point number encoded string • isFinite() Determines whether eval() Evaluates a string and executes it as if it was script code @akshaymathu 63

@akshaymathu 64

JS Objects

Objects • Everything in JS is an object (instance) “string”.length // 6 “str”.length.toFixed(2) // “3.00” [„hell‟, „o!‟].join(„‟) // „hello!‟ • Custom objects can also be defined @akshaymathu 66

JSON • Javascript Object has a key and a value • Key is always string • Value can be of any type – Including another JSON object A = {key1: value1, key2: value2}; or A = new Object(); A[„key1‟] = value1; A.key2 = value2; @akshaymathu 67

Object as Namespace • It is a good practice to group variables and functions together in an object rather than keeping them global var user = {}; user.name = “Akshay”; user.greet = function(){ alert(„Hello!„.concat(user.name); }; @akshaymathu 68

Object as Named Argument • Objects can be passed to a function as an argument • They proxy for named arguments Say_hello = function (options){ if (typeof options === „Object‟){ options.msg = (options.msg)? options.msg : ‟Hello!‟; } alert(options.msg + „ „ + options.name); } Say_hello({name: „Akshay‟}); @akshaymathu 69

@akshaymathu 70

Dynamic Pages

Server Side Dynamism • At web server • Ability to execute a program in context of a web request – The program takes input from the request – The program creates a HTML page as output • Web browser understands only HTML • Embedded scripting technologies make it simpler – Allow the program to be inserted within an HTML page • PHP, ASP, JSP etc. @akshaymathu 72

Client Side Dynamism • At web browser – Javascript • Ability to change properties of elements on the web page on user’s action – Text color, image source etc. – On click, on hover etc. • Ability to validate Form input without the round trip @akshaymathu 73

Document Object Model • Window Object – Represents the browser window – All Javascript functions and variable are attached here by default • Document Object – Represents the page rendered inside the window – All HTML elements are available here • In the hierarchy they are attached @akshaymathu 74

Manipulating the Web Page • Get programmatic handle of an HTML element via Document Object Model (DOM) var el = document.getElementByID( „a_unique_id‟); • Change desired property of the element el.src = “my_photo.png” @akshaymathu 75

Changing Style • Access to inline style properties is via style object text_color = el.style.color • Change desired style attribute el.style.fontSize = “16px” @akshaymathu 76

Responding to User Actions • Browser raises an event on user action – A few of them are onclick, onkeypress • A JavaScript function can be called when the event happens el.onclick = function(){ alert(„User clicked!‟); } @akshaymathu 77

@akshaymathu 78

presents Creating Single Page Web App Series of 3 workshops Full Day Hands-on

1. Simple Web Pages • • • • • • • • Introduction to Web and its evolution Web page basics and HTML tags Styling elements JavaScript basics Introduction to DOM Changing style using JavaScript Simple DOM manipulation Responding to user actions @akshaymathu 80

2. Dynamic Web Pages • • • • Jquery JavaScript Framework Handling DOM events Getting data asynchronously via AJAX Client side dynamism using JavaScript templates • Simplify JS coding via CoffeeScript • Writing JS classes (prototypes) @akshaymathu 81

3. Single Page App • • • • • • Understanding MVC concepts Introduction BackboneJS and UnderscoreJS Using Backbone models, views and router Dealing with collections Custom events and their handlers Adjusting URLs for making browser buttons work @akshaymathu 82

Document Object Model • Window Object – Represents the browser window – All Javascript functions and variable are attached here by default • Document Object – Represents the page rendered inside the window – All HTML elements are available here • In the hierarchy they are attached @akshaymathu 83

Manipulating the Web Page • Get programmatic handle of an HTML element via Document Object Model (DOM) var el = document.getElementByID( „a_unique_id‟); • Change desired property of the element el.src = “my_photo.png” @akshaymathu 84

JS Framework • Library for simplifying JS coding – Jquery is most popular • Provides simple interface and syntactic sugar for common JS work – Selecting DOM element – DOM traversal and manipulation – Event handling • Takes care of cross browser and cross version issues @akshaymathu 85

Jquery • Takes care of cross browser and cross version issues • Library for simplifying JS coding – Everything is via functions – Same function for get and set • Provides simple interface and syntactic sugar for common JS work – Selecting DOM element – DOM traversal and manipulation – Event handling @akshaymathu 86

Javascript Templates • Dynamically creates HTML code in JS – Data driven HTML – Allows variable substitution, looping and conditional statements • Generated HTML is inserted into the DOM for changing part of the page on-the-fly @akshaymathu 87

Using Template <script type="text/x-jquery-tmpl” id=”photo"> <img src=“${photo_url}” title="${name}" /> </script> <script type="text/javascript”> template = $(‟#photo').template(); t_html = $.tmpl(template, data); $(“#container”).html(t_html); </script> @akshaymathu 88

AJAX • A way in web browser to communicate with server without reloading the page • XmlHttpRequest (XHR) object can also create HTTP request and receive response – The request happens asynchronously • Other operations on page are allowed during the request – Received data does not render automatically • Data needs to be received in a callback function and used programmatically @akshaymathu 89

AJAX Call $.ajax({ url: „/my_ajax_target‟, type: „POST‟, DataType: „json‟, data: {id: 2}, success: function(response){ alert(„Hello! „ + response.name); }, error: function(){ alert(„Please try later‟); } }); @akshaymathu 90

CoffeeScript • A language with simple syntax – No semicolons and braces – Resembles to English – Indentation decides the code blocks • Compiles into Javascript – Provides syntactic sugar for boilerplate code • Manage variable scope • Class instead of prototype – Generates good quality, error free code @akshaymathu 91

Cofeescript to Javascript greet_me = (name) -> greeting_word = 'Hello!' alert "#{greeting_word} #{name}” Compiles to greet_me = function(name) { var greeting_word; greeting_word = 'Hello!'; return alert("" + greeting_word + " " + name); }; @akshaymathu 92

BackboneJS • Provides MVC structure for Javascript – The model object holds data – The view object handles visual elements and interactions – The controller object glues everything together and provides communication amongst objects • Custom Events help writing good code and eliminates use of global variables – The event object allows raising and handling custom events @akshaymathu 93

BackboneJS code in Coffeescript class LoginModel extends Backbone.Model class LoginView extends Backbone.View initialize: => @template = $(‟#login_template').template() @render() render: => $(@el).html $.tmpl(@template, @model.toJSON()) events: 'click #login_btn' : ‟login_handler‟ login_handler: (ev) => window.mpq_track ‟Login Click‟ class LoginController extends Backbone.Router initialize: => @l_model = new LoginModel window.app_info @l_view = new LoginView model: model, el: ‟#login_div‟ @akshaymathu 94

Thanks http://www.quora.com/Akshay-Mathur @akshaymathu @akshaymathu 95

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