Electronic Volume Control The electronic volume control turns continuously degrees in either direction without stopping.
Users can choose one and only one option. Radio buttons are so called because they function like the channel presets on radios. A typical group of radio buttons. A group of radio buttons behaves like a single control.
Corresponding radio button the selected choice is accessible using the Tab key, but users can cycle through the group using the arrow keys.
Note Guidelines related to layout and keyboard navigation are presented in a separate article. Is this the right control? To decide, consider these questions: Is the control used to choose one option from a set of mutually exclusive choices? If not, use another control. To choose multiple options, use check boxesa multiple-selection list or a check box list instead.
Is the number of options between two and seven? Since the screen space used is proportional to the number of options, keep the number of options in a group between two and seven.
For eight or more options, use a drop-down list or single-selection list. Would a check box be a better choice? If there are only two options, you could use a single check box instead.
However, check boxes are suitable only for turning a single option on or off, whereas radio buttons can be used for completely different alternatives. If both solutions are possible: Use radio buttons if the meaning of the cleared check box isn't completely obvious.
In the correct example, the choices are not opposites so radio buttons are the better choice. Use radio buttons on wizard pages to make the alternatives clear, even if a check box is otherwise acceptable. Use radio buttons if you have enough screen space and the options are important enough to be a good use of that screen space.
Otherwise, use a check box or drop-down list. In this example, the options aren't important enough to use radio buttons. In this example, a check box is an efficient use of screen space for this peripheral option. Use a check box if there other check boxes on the page. Would a drop-down list be a better choice?
If the default option is recommended for most users in most situations, radio buttons might draw more attention to the options than necessary. Consider using a drop-down list if you don't want to draw attention to the options, or you don't want to encourage users to make changes.
A drop-down list focuses on the current selection, whereas radio buttons emphasize all options equally. In this example, a drop-down list focuses on the current selection and discourages users from making changes.
Consider a drop-down list if there are other drop-down lists on the page. Would a set of command buttons, command links, or a split button be a better choice? If the radio buttons are used only to affect how a command is performed, it is often better to present the command variations instead.
Doing so allows users to choose the right command with a single interaction.
Do the options present program options, rather than data? The options' values shouldn't be based on context or other data. For data, use a drop-down list or single-selection list. If the control is used on a wizard page or control panel, is the control a response to the main instruction and can users later change the choice?
If so, consider using command links instead of radio buttons to make the interaction more efficient. Are the values non-numeric?Selection controls allow users to complete tasks that involve making choices such as selecting options, or switching settings on or off.
Selection controls are found on screens that ask users to make decisions or declare preferences such as settings or dialogs. Button and coin cell batteries are used to power small, portable electronics devices like the keyless entry remote for your car, watches, and remote controls.
I have a list of options in a data object, and I want to make the equivalent of a radio button list to allow the user to select one and only one of them. Functionality similar to a databound combo. For up-to-date hurricane and severe weather information, even during a power outage, listen to your NOAA Weather radio.
The Midland ER with emergency crank function keeps you alerted when the power is down. Keep extra batteries handy, as well as bottled water and canned food.
How it works. The smart key allows the driver to keep the key fob pocketed when unlocking, locking and starting the vehicle. The key is identified via one of several antennas in the car's bodywork and a radio pulse generator in the key housing.
Depending on the system, the vehicle is automatically unlocked when a button or sensor on the door handle or trunk release is pressed.
Set two-, five-, or seven-day alarms with the ICF-C clock radio. It's ideal for your busy lifestyle, and perfect for ending your day in style.