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The proposition so far in this chapter has been that with HTML or JavaScript we can write all our applications. But how practical is that In any application you will need mechanisms to program a flexible UI with forms, media, and so forth. You will need something to host your business logic and you will need something to read and persist state in a database. Let us talk about simpler things first: middleware and data. JavaScript through AJAX and JSON can always request data through servers which can act as conduits for persistence and also some or all business logic. If the application were to access some local resources or local databases they could always use SQLite. But you would expect that cloud services and the threetier model are better for all but special cases. You would foresee no significant problems with this approach. A UI framework is a different beast, however. Frameworks like Swing and WPF (Windows Presentation Framework) are complex frameworks. How far can plain HTML combined with JavaScript match these UI capabilities

Now that the menus are set up, we move on to step 6: responding to them. When a menu item is clicked, Android calls the onOptionsItemSelected callback method of the Activity class by passing a reference to the clicked menu item. You then use the getItemId() method on the MenuItem to see which item it is. It is not uncommon to see either a switch statement or a series of if and else statements calling various functions in response to menu items. Listing 5-11 shows this standard pattern of responding to menu items in the onOptionsItemSelected callback method. (You will learn a slightly better way of doing the same thing in the Loading Menus Through XML Files section, where you will have symbolic names for these menu-item IDs.) Listing 5-11. Responding to Menu-Item Clicks @Override public boolean onOptionsItemSelected(MenuItem item) if (item.getItemId() == 1) { appendText("\nhello"); } {

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Although a number of hurdles remain, a tool like JQuery that is based on JavaScript gives a powerful model to dynamically alter the HTML DOM tree to address some of these questions. JQuery is nimble, simple, and extensible. The query in JQuery comes from its ability to query any node in an HTML DOM through succinct syntax like CSS selectors and XSLT expressions. So the query in JQuery does not indicate its affinity to being a database tool. It is in fact a UI tool for HTML. We will go through a few examples in this chapter to show you how this works. JQuery is just one of the tools in this genre that use HTML and JavaScript for extensive UI programming. You are free to investigate these alternatives and choose an appropriate one for your needs. With that said, let us take a quick tour of JQuery.

extensions that OCaml uses that other ML dialects do not use (these other files are covered in depth in upcoming chapters).

You can find the home page for JQuery at http://jquery.com/. From there you will be able to download the single JavaScript file that makes up JQuery. This file is about 100K of JavaScript. Once you download it, you will be able to include it in your HTML pages using the code segment in Listing 17 11.

else if (item.getItemId() == 2) { appendText("\nitem2"); } else if (item.getItemId() == 3) { emptyText(); } else if (item.getItemId() == 4) { //hide secondary this.appendMenuItemText(item); this.myMenu.setGroupVisible(Menu.CATEGORY_SECONDARY,false); } else if (item.getItemId() == 5) { //show secondary this.appendMenuItemText(item); this.myMenu.setGroupVisible(Menu.CATEGORY_SECONDARY,true); } else if (item.getItemId() == 6) { //enable secondary this.appendMenuItemText(item); this.myMenu.setGroupEnabled(Menu.CATEGORY_SECONDARY,true); } else if (item.getItemId() == 7) { //disable secondary this.appendMenuItemText(item); this.myMenu.setGroupEnabled(Menu.CATEGORY_SECONDARY,false); } else if (item.getItemId() == 8) { //check secondary this.appendMenuItemText(item); myMenu.setGroupCheckable(Menu.CATEGORY_SECONDARY,true,false); } else if (item.getItemId() == 9) { //uncheck secondary this.appendMenuItemText(item); myMenu.setGroupCheckable(Menu.CATEGORY_SECONDARY,false,false); } else { this.appendMenuItemText(item); } //should return true if the menu item //is handled return true; } Listing 5-11 also exercises operations on menus at the group level; calls to these methods are highlighted in bold. The code also logs the details about the clicked menu item to the TextView. Listing 5-12 shows some utility functions to write to the TextView. Notice an additional method on a MenuItem to get its title.

Overall, the documentation at the site is very good. This makes it easy to quickly learn JQuery. And you can leverage this knowledge in your serverside HTML programming as well. Let us see what we can do with it. One common thing you might want to do in HTML is to locate a div or a paragraph and replace the contents of that element with some text. You may also want to change the style of that div or hide that div. So let us do each of these (see Listing 17 12).

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