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PHP Input control or control

HTML defines the following control types:

buttons
Authors may create three types of buttons:

Authors create buttons with the

BUTTON

 

element or the

INPUT

element. Please consult the definitions of these elements for details about specifying different button types.

Note. Authors should note that the 

BUTTON

 

 element offers richer rendering capabilities than the 

INPUT

element.

checkboxes
Checkboxes (and radio buttons) are on/off switches that may be toggled by the user. A switch is “on” when the control element’s

checked

attribute is set. When a form is submitted, only “on” checkbox controls can become successful.Several checkboxes in a form may share the same control name. Thus, for example, checkboxes allow users to select several values for the same property. The

INPUT

element is used to create a checkbox control.

radio buttons
Radio buttons are like checkboxes except that when several share the same control name, they are mutually exclusive: when one is switched “on”, all others with the same name are switched “off”. The

INPUT

element is used to create a radio button control.

If no radio button in a set sharing the same control name is initially “on”, user agent behavior for choosing which control is initially “on” is undefined. Note. Since existing implementations handle this case differently, the current specification differs from RFC 1866 ([RFC1866] section 8.1.2.4), which states:

At all times, exactly one of the radio buttons in a set is checked. If none of the <INPUT> elements of a set of radio buttons specifies `CHECKED’, then the user agent must check the first radio button of the set initially.

Since user agent behavior differs, authors should ensure that in each set of radio buttons that one is initially “on”.

menus
Menus offer users options from which to choose. The

SELECT

element creates a menu, in combination with the

OPTGROUP

and

OPTION

elements.

text input
Authors may create two types of controls that allow users to input text. The

INPUT

element creates a single-line input control and the

TEXTAREA

element creates a multi-line input control. In both cases, the input text becomes the control’s current value.

file select
This control type allows the user to select files so that their contents may be submitted with a form. The

INPUT

element is used to create a file select control.

hidden controls
Authors may create controls that are not rendered but whose values are submitted with a form. Authors generally use this control type to store information between client/server exchanges that would otherwise be lost due to the stateless nature of HTTP (see [RFC2616]). The

INPUT

element is used to create a hidden control.

object controls
Authors may insert generic objects in forms such that associated values are submitted along with other controls. Authors create object controls with the

OBJECT

element.

The elements used to create controls generally appear inside a

FORM

 

element, but may also appear outside of a

FORM

element declaration when they are used to build user interfaces. This is discussed in the section on intrinsic events. Note that controls outside a form cannot be successful controls.