[an error occurred while processing this directive] File: index.shtml Creator: George Ferguson Created: Tue Nov 13 19:31:40 2012 Time-stamp: [an error occurred while processing this directive] File: templates/doc-start.shtml Creator: George Ferguson Created: Tue Dec 6 12:31:29 2011 Time-stamp: [an error occurred while processing this directive] File: site-settings.shtml Creator: George Ferguson Created: Tue Dec 6 13:49:49 2011 Time-stamp: Site (or subsite)-wide settings. [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] File: head.shtml Creator: George Ferguson Created: Tue Dec 6 12:34:15 2011 Time-stamp: SSI variables for this template: head_title if given, else ``sitename | title'' [an error occurred while processing this directive] File: head-title.shtml Creator: George Ferguson Created: Tue Dec 6 14:29:52 2011 Time-stamp: SSI variables for this template: head_title: complete content of title element if given site_title trailing part of title (if given) section_title middle part of title (if given) page_title leading part of title (if given) title title shown on page, also used as leading part of title (if given) [an error occurred while processing this directive] (none) [an error occurred while processing this directive] File: head-meta.shtml Creator: George Ferguson Created: Tue Dec 6 14:29:18 2011 Time-stamp: SSI variables for this template: meta_description meta_keywords meta_generator [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] File: head-stylesheets.shtml Creator: George Ferguson Created: Tue Dec 6 14:22:58 2011 Time-stamp: SSI variables for this template: site_stylesheet, page_stylesheet stylesheet0, stylesheet1, ...: URL for stylesheets [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] File: head-scripts.shtml Creator: George Ferguson Created: Tue Dec 6 14:23:19 2011 Time-stamp: SSI variables for this template: site_script, page_script script0, script1, ...: URLs of javascript scripts [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] File: body-start.shtml Creator: George Ferguson Created: Tue Dec 6 13:20:46 2011 Time-stamp: SSI variables for this template: body_class page_class page_id [an error occurred while processing this directive] [an error occurred while processing this directive] File: body-header.shtml Creator: George Ferguson Created: Tue Dec 6 13:46:12 2011 Time-stamp: Content above banner, if any. [an error occurred while processing this directive] File: body-banner.shtml Creator: George Ferguson Created: Tue Dec 6 13:27:12 2011 Time-stamp: Duplicate URCS Drupal banner. hajim urcs
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[an error occurred while processing this directive] DMS102/CSC170D: Introduction to Web Development
Spring 2013 [an error occurred while processing this directive]
Assignment 9: Events

For each of the following questions, create a document that illustrates how your scripts work. It may need elements of a certain type, or with certain attibutes, etc. You can describe what's happening in the document itself, which helps the TAs understand your work.
  1. [4 pts] Write a page that provides a way of making the text on the page size bigger, smaller, or some preset default size. Could be text (Bigger, Default, Smaller) or images or even form controls with the appropriate handlers. Hint: In your event handler, try setting a text property on an element that includes all the content on the page.
  2. [4 pts] Write a page that uses an image as a button (i.e., an img with a click event handler). Have the handler toggle between two different images to show the button in its on and off states.
  3. [4 pts] Write a page with a form for entering a user's name and id number. Use event handlers (probably for blur or submit events, or both) to check that the name is not empty and the id is indeed a number before submitting the form. Put up an alert dialog if not.
  4. [4 pts] Write a page that displays the current time and updates itself every second.

Things to think about

  • Events are predefined things that can happen when a user is viewing a page (or when it is loading).
  • Event handlers (a.k.a., listeners) are simply functions that are attached to a DOM element and fired (run, invoked) when a specific type of event occurs on the element. You don't invoke the handler functions yourself. The browser does it for you.
  • Typically in an event handler you use DOM properties and methods to change the document. The browser then renders the changes, which changes the display.

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Last update: Friday, 05-Apr-2013 14:39:05 EDT

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