Week Eight (MGDP2050)

Lecture notes and exercises for Week Eight of Web Design and Development II (MGDP2050).

See also Week Seven (MGDP2050) - Week Nine (MGDP2050).

HTML and semantics

In principle, the role of HTML is to provide semantics (meaning).

In practice, HTML is a mix of semantic and non-semantic elements.

Semantic HTML

Semantic HTML refers to HTML that is entirely semantic (or perhaps "very semantic with acceptable compromises").

Bold versus strong

Earlier versions of HTML specified a bold element, to make text display in boldface.

HTML 4 also specified a strong element, intended to replace the bold element.

Both elements are valid in HTML5.

Italic versus emphasis

Earlier versions of HTML specified an italic element, to make text display in italicf.

HTML 4 also specified an emphasis element, intended to replace the italic element.

Both elements are valid in HTML5.

JavaScript

Recognizing JavaScript

• Recognizing JavaScript.

Using JavaScript

• Using JavaScript.

Script element

• Use the script element to include JavaScript in a web page.

Debugging JavaScript

• See the browser console for JavaScript error messages and other browser-related tools.

JavaScript Validation

See JSLint and JSONLint.

jQuery

• Review jQuery ...

jQuery UI

jQuery UI is a set of interactive components for web pages.

It is built on jQuery.

Many of the features in jQuery UI are similar to features in Bootstrap (framework).

= Demonstrate the Dialog component

First goal, create week8 folder and demonstrate the jQuery UI component, like this

• http://mgdp2050.htcwebcreative.com/week8/index.html

Click the "Open dialog" button to confirm that the dialog box works.

Note that some text is too small. Also, the dialog box has different colors from the rest of the page. How do we fix this?

I created the example in the usual way:

• Create a week8 folder
• Copy the index.html page from a previous exercise
• Paste into the week8 folder
• Update the page title, and change the contents to this week's exercise

Then I copied sections of jQuery UI example page (which is part of the jQuery UI download), and pasted those sections into my exercise page.

Here is the jQuery UI example page:

• http://mgdp2050.htcwebcreative.com/jquery-ui-1.11.4/index.html

Find the example page in your own jQuery UI folder, open it in a text editor, and copy-and-paste the sections you need.

= Demonstrate two more components

When you have the Dialog working, demonstrate two more jQuery UI components (your choice).

Browse the jQuery UI demos

Browse the jQuery UI demos.

• https://jqueryui.com/demos/

Try several.

Pick three which interest you.

Download and install jQuery UI

Browse the jQuery UI website:

• https://jqueryui.com/

Click the "Stable" link (in the Quick Downloads section).

• This will download a Zip file containing the jQuery UI files.

Unzip the Zip file, if necessary, to get the jQuery UI folder.

There is a first folder named jquery-ui-1.11.4 (or something similar -- version number may increase).

This folder contains a second folder with the same name, containing the jQuery UI files and subfolders. This is the actual jQuery UI folder.

Instructor's example: files

Move the jQuery UI folder to your local root folder.

You can now use jQuery UI in your web pages.

Instructor's example: jQuery UI Components

The jQuery UI folder contains a web page named index.html which demonstrates the components.

Link to the instructor's page:

• http://mgdp2050.htcwebcreative.com/jquery-ui-1.11.4/index.html

The screeshot below shows the Components page in a web browser:

Instructor's example: Dialog component

The screenshot below show the Components page, scrolled down the Dialog button

The button has already been clicked to reveal the Dialog box.

Based on this demo:

• https://jqueryui.com/dialog/

Instructor's example: CSS

Screenshot of source code -- note the external CSS file, and the internal CSS styles:

Instructor's example: HTML for link

The screenshot below shows the HTML for the link that launches the Dialog component:

Instructor's example: HTML for Dialog

The screenshot below shows the HTML for the Dialog itself:

Instructor's example: JavaScript

The screenshot below shows some of the JavaScript for the instructor's Sample components page.

Note the external JavaScript files, and some internal JavaScript (only first portion shown here).

Instructor's example: Dialog component screenshot

The screenshot below shows the internal JavaScript for the Dialog component example:

Instructor's example: Dialog component text

Here is the JavaScript for the Dialog box:

$( "#dialog" ).dialog({
	autoOpen: false,
	width: 400,
	buttons: [
		{
			text: "Ok",
			click: function() {
				$( this ).dialog( "close" );
			}
		},
		{
			text: "Cancel",
			click: function() {
				$( this ).dialog( "close" );
			}
		}
	]
});

// Link to open the dialog
$( "#dialog-link" ).click(function( event ) {
	$( "#dialog" ).dialog( "open" );
	event.preventDefault();
});

Create folder named week8

In your local root folder, create a new folder named week8.

Create web page

In your week8 folder, create a web page named index.html.

• Similar to other exercise pages.
• Set page title, etc.

Demonstrate a jQuery UI component

In your web page, demonstrate a jQuery UI component of your choice.

Update your home page

On your Home page, make a link to your jQuery UI exercise.

Upload to web server

Upload your work to the web server:

• Exercise page
• jQuery UI folder

Exercises: for next week

Demonstrate two more jQuery UI components

Demonstrate two more jQuery UI components of your choice.

You may do this in the same web page, or you may create additional web pages.

• If you create additional web pages, provide links on your home page.

Reading for next week

• Web application