Character pickers are especially useful for people who don't know a script well, as characters are displayed in ways that aid identification.
This picker is still in the experimental stage. If it is missing characters that are needed for Uighur, please let me know.
To properly display the text you will need to choose a font that is loaded on your system or device. The font list indicates which fonts are standard for Mac (Snow Leopard/Lion) and Windows7. See more information about standard OS fonts in Mac and Windows.
I am still working out which fonts work best for Uighur, so the list is probably longer than needed, particularly for Windows.
You can also add codepoints and escapes via the "Add codepoint" field (hit return to add to the output field). You can also paste text into the output field to get information about it. Use the yellow boxes to set preferences or search. Regular expressions are allowed when searching – for example, to find characters with the word KA in their name, enter \bka\b, or the short form :ka:.
When working on an iPad or similar device, you should turn off more controls/Autofocus. This prevents the keyboard popping up after you input every character. You may also need to select a character twice to add it to the output field.
About the chart
Includes characters in the Unicode Arabic block that are used for Uighur. I still have to ascertain whether additional characters are needed. Certainly it's likely that there is some punctuation to be added yet. Let me know if you have suggestions.
All text is output in Unicode normalisation form NFC by default. You can change to NFD or no normalisation by clicking on the buttons in the yellow area. Note that normalization only takes place when you click on a character - text pasted into the box won't be normalised until you click on another character above, or click on a button in the yellow area. (Note: normalization is turned off for Han characters in this application.)
The following alternative views are available by clicking on the vertical grey bar to the left of the selection area.
Default Clicking on this turns off the other features described in this section. The default table is likely to be most useful to people who are somewhat familiar with the alphabet and characters of Uighur. Characters are arranged based on the use of the script in order to speed up picking.
Consonants are to one side, and vowels are to the other side. They are arranged in alphabetic order, within those divisions. Numbers are available in a separate block.
By default, the table is right-aligned and flows from right to left, however it is possible to flip it using more controls/table direction.
Hints This changes the behaviour of the table view so that, when you mouse over a character, characters that are similar in appearance, and may be easily confused, are automatically highlighted. This can be particularly useful for people who are not familiar with the script, to avoid confusing similar characters, or to find the right character when two or more look similar.
Transcriptions Latin characters used in transcription can be displayed, if needed.
Tools above the input box
Controls above the input box allow you to run various operations on the text in the box. Most of them work on what you have selected within the box, or the whole box if nothing is selected.
Copy, select, delete. The icons on the left above the input box allow you to copy the text to the clipboard, select the text or delete the text, respectively.
Show codepoints. Produces a list of the Unicode code points in the input box. You can usually follow a link from a code point item to more detailed information about that character.
Convert to escapes. Opens a new window for the converter app, which shows various different ways of representing the text in the input box using escapes.
Make example. This may be useful to speed up the creation of examples. You can create an example with four parts, delimited by /, in the following order:  Arabic text,  IPA transcription,  other transcription,  meaning. You don't need to add all four elements, but if you want to skip one in the middle of the sequence, use //.
For example, the following (which is displayed here more as you'd type it than see it):
Character markup. This may be useful to speed up the creation of markup for a specific character or set of characters. Select one or more characters in the output area, then click this button. It will return something like the following for each of the characters:
<span class="uname">U+06C7 ARABIC LETTER U</span> (<span lang="ug">ۇ</span>)
U+6C7 ARABIC LETTER U (ۇ)
Notes on other controls
Controls at the bottom of the page allow you to modify fonts used, the font size, and the height of the output box.
Searching by character name or codepoint. If you are searching for a particular character and know (at least part of) the name or the codepoint, type that in the search box and hit return. All characters with matching text in the name or codepoint number will be highlighted. The highlighting is only removed when you click on the X next to the search input field. You can also use regular expression syntax to improve your search results. For example, to find the letter 'ha', but not 'gha' etc, you can use \bha\b (or the shortcut, :b:).
CC base. You would normally expect combining characters, such as accents and vowel signs, when displayed alone to be associated with a dotted circle, however these font glyphs are handled inconsistently from one browser/font to the next. The picker is set up for a given web font initially, but if you change the table font you may need to do something to ensure that combining characters display in a way that helps you click on them. The CC base control allows you to specify a base character that will be used before each combining character (or no base character). This should hopefully help for most font and browser combinations.
Table direction. Allows you to flip the direction of the default input table.