This document outlines concepts for web development including HTML, CSS, JavaScript, and JSON. It discusses using HTML elements like divs and forms, styling with CSS, programming concepts like variables, data types, and functions. It also covers manipulating the DOM with JavaScript methods and using JSON to store and access data.

1. Web Development

2. Outline
• Review HTML/CSS concepts
• Using a Bootstrap installation
• DOM Manipulation with JavaScript
• Quiz Exercise
• Filtering and Visualizing Data

3. HTML
Layout elements
<div>
<span>
Forms
<form id="myform">
<input type="text" id="firstname" />
<select id="car">
<option value="ford">Ford</option>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
</select>
</form>

4. CSS
• Cascading Stylesheets provide a way to style elements across a site
• It is used for establishing layout, color, font-sizes and more
• Can be used in an external stylesheet, linked in each html page
<link rel="stylesheet" href="css/style.css" type=”text/css" >
• in the head of a document
<style>
p {
font-family: Helvetica;
font-size: 14px;
}
</style>
• Inline
<p style= ”font-famly: Helvetica”>

5. HTML
• Attributes
Provide options within elements (href, src, bgcolor, text…)
<a href= "http://google.com" target="_blank">Google</a>
<img src= "img/cindy.jpg" />
• IDs and Classes
• Generic attributes used for styling and to define elements to be manipulated by script
• IDs used once on page; Classes can be used multiple times
• <div id="header”>
• <p class="red">
• Comments
Comments are used to remove text from code, does not render – site instructions or to void
something for testing
<!-- this is a comment -->

6. Programming Concepts
• Variables – store data to be used elsewhere in the program
name="cindy"
• Data Types – string, number, boolean
• Concatenation – combining variables, string and numbers
name= firstname + " " + lastname
Concatenates the value in firstname, a space and value in lastname
• Methods
num = password.length
password = name.substring(0,8)

7. Programming Concepts
• if statements
if(pw.length > 8) {
message = "password accepted";}
else {
message = "password rejected";
}
• loops
for(i=0; i< 10; i++) {
message = "repeating this 10 times";
}

8. Programming Concepts
• functions – a function is a way to store a series of instructions to be
referenced later in the program
• Definition and execution
function hello(a) {
message = "Hello " + a;
}
hello("Cindy");

9. Programming Concepts
• Arrays and Objects – ways to store data in a program
Array
bands = ["Coldplay", "U2", "Foo Fighters"];
access with index number, in square brackets, starting with 0
firstband = bands[0];
Object
bands = [{name: "Coldplay", country: "England"},
{name: "U2", country: "Ireland"},
{name: "Foo Fighters", country: "United States"};]
access with index number and property
firstbandname = bands[0].name

10. JavaScript Methods
Use JavaScript methods to manipulate the Document Object Model
(DOM)
document.getElementById("msg").innerHTML = "Hello World";
Grab value from a form element
first = document.getElementById("firstname").value;
These procedures are very powerful in making interactive
presentations

12. JSON
• JavaScript Object Notation – a way to store and organize data in a text format
• Use a loop to access it and return to the DOM; use a condition to filter it
data = [ { "incnum": 16002735, "month": "Jan", "day": 10, "battalion": "B5",
"status": "Code 3", "priority": "3F", "unit": "ENG01", "district": 9, "lat":
30.228627, "long": -97.746432 },
{ "incnum": 16002786, "month": "Jan", "day": 10, "battalion": "B3", "status":
"Code 3", "priority": "3F", "unit": "ENG14", "district": 1, "lat": 30.300323,
"long": -97.640077 },
{ "incnum": 16002786, "month": "Jan", "day": 10, "battalion": "B3", "status":
"Left Blank", "priority": "3F", "unit": "QNT18", "district": 1, "lat": 30.300323,
"long": -97.640077 } ];