This document summarizes key topics from a jQuery Brownbag presentation, including checking for null values, setting default values, properties, why jQuery is awesome, jQuery's founder and philosophy, selecting elements, events in jQuery, Ajax examples, plugins, and learning more about jQuery. The document provides code examples for common tasks like DOM manipulation, event handling, and Ajax using jQuery.

1. jQuery BrownbagRod Johnson

2. Checking for Null ValuesC# Way…JavaScript Way

3. Setting Default ValuesC# Way…JavaScript Way

4. PropertiesC# Way…JavaScript Way

5. Why is jQuery Awesome?What jQuery does well:Simplified AJAXDOM ManipulationEvent ManagementAnimationsNormalizes Browser DifferencesWhy It Is Successful:Well DesignedEasy to extend with pluginsGreat DocumentationLarge jQuery CommunityCross-browser

6. jQuery Founder

7. jQuery PhilosophyFind some stuffDo something to it

8. Chaining

9. Example: Conditional Hide Show

10. Selecting Elements: Basic CSS Selectors

11. Selecting Elements: Positional Selectors

12. Example: Expanding Form

13. Example: Expanding Form - ContinuedIterate through jQuery wrapped set by using the each() method.There are 2 ways to pass in this data.Controls the context. This is consistent.Since this item is added dynamically, you will need to use the live() method instead of bind()You can chain jQuery objects to each other. This makes for really succinct statements.Indent your code so you can easily see what is the current object in the chainControl chaining with the end() method

14. Events in jQueryControl how this event gets bubbled down the DOMPrevent the default behavior of an element. Useful for buttons and links.Bind an element that is already added to the DOMBind an element that is not yet added to the DOM. Very useful with Ajax or adding elements dynamicallyNamespacing works really well when you have multiple listeners attached to the same element.Unbinding events.Opposite of live()

15. Example: Pager

16. Example: Pager - ContinuedSetup event handlerOptional second parameter stores your custom data that is passed from the eventEvents can be triggered by using the trigger() method.Load custom data from the data attribute of the html elementAlways prevent the default behavior of any hyperlink event you trap.

17. Example: Default ImagesBind default resources on the “error” event.

18. jQuery in Visual StudioBy adding script references to your .js file, you get intellisense… kinda.You will not be able to select any elements until the document is ready.Most if your work will happen here.Good practice to always alias your $ by using Local Scope. This will prevent any collisions with any other library that may use $ variable

19. Example: Simulated Page LifecycleBy adding script references to your .js file, you get intellisense… kinda.Works good if you have multiple js files that all depend on the document loaded event

20. Example: Ajax ProxyVery flexible way to pass in parameters to a function.Pass in as many or as few parameters as you need.Alias your functions by using jQuery as $

21. Example: Ajax Dropdown with ASP.NET MVC

22. Pattern: Default ValuesOld way… Doesn’t scale very well at all.Pass in an object hash with as many or as few parameters as you want.jQuery Way…Enumerate any default valuesDefault values will be overwritten by the values you passed in the ‘params’ object.

23. jQuery Plugins

24. jQuery UI Plugin

25. jQuery - BBQhttp://benalman.com/projects/jquery-bbq-plugin/Merge query string fragments into the query string#foo=1&bar=2Maintains history with each hash changeGreat for AJAX history managementPagingTabs

26. Linq to jQueryWithout Linq to jQuery…With Linq to jQuery…

27. Plugin AuthoringDon’t break the chain…Can use as if it were just a regular jQuery method

28. Learn More About jQuery

29. jQuery Documentation

30. Learn Morehttp://jquerylist.com/http://enterprisejquery.comhttp://jquery.com