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Technology Transfer Network
U.S.-Mexico Border Information Center on Air Pollution (CICA)
Versión en Español
Before producing a report of U.S.-Mexico border air quality data,
you need to specify what data should be selected and presented. For
example, you would choose which pollutants to include. We refer to
options such as this as report selection criteria.
Each border air quality report has a selection criteria Web page
that lists the particular options available, which vary from report
to report. The Web page also indicates which criteria you must specify,
and which ones are optional.
Border air quality Web pages display report selection criteria using
lists, checkboxes, and radio buttons. These standard
Web page elements allow you to see what options are available, and
to choose among them.
A selection list displays a set of options (values) available
for you to choose. A list can present numerous choices compactly,
but you may need to scroll the list to see all of them. There
are two selection list styles, single and multiple, illustrated
by the examples included near this paragraph.
With the "Single" list style, you select one of
the available choices. The selected choice is visible. Clicking your
mouse pointer on the small arrow (triangle) expands the list and makes
additional choices visible. Clicking on a choice selects it, collapses
the list, and displays the selected choice. (Keyboard alternative:
use up and down arrow keys to scroll the list until the desired choice
The "Multiple" list style lets you select any number
of the available choices: none, some, or all of them. A scroll bar
beside the choices allows you to scroll the list, if all choices are
not visible. Clicking your mouse pointer on a choice selects it and
unselects all other choices. (Keyboard alternative: use up and down
arrow keys to scroll to a choice.) The selected choice is highlighted,
usually with a different background color.
- To select an additional choice, or to deselect a choice, hold down
the Control key (Windows) or Command key (Macintosh) while clicking
on a choice.
- To select a contiguous group of choices, click on the first choice,
hold down the Shift key, and click on the last choice. (Keyboard alternative:
hold down the shift key while scrolling to select a contiguous group
Generally, border air quality Web pages use checkboxes in the same
way as multiple-style lists (above). The checkboxes let you select
all, some, or none of a related group of options.
A radio button allows you to choose one of a group of
options. In this respect, a radio button is similar to a single-style
list (above). Border air quality Web pages generally use radio
buttons when there are only two or three choices for an option.
A visual radio button indicator (circle) contains a dot or is filled
with a dark shade to indicate the selected state, and is empty in
the unselected state. The radio button examples near this paragraph
illustrate both states. Click your mouse pointer on a radio button
to select the associated choice. (Keyboard alternative: Tab to a radio
button and press Space bar, or Tab to a radio button group, and use
up or down arrows keys to select among buttons in the group.)