Extends
Members
-
datatypestring
-
Specifies a datatype constraint expression to validate input values against. Refer to
LuCI.validation
for details on the format.If the user entered input does not match the datatype validation, the option element is marked as invalid.
- Default Value:
- null
-
default*
-
Sets a default value to use when the underlying UCI option is not set.
- Default Value:
- null
-
editableboolean
-
Mark grid section option element as editable.
Options which are displayed in the table portion of a
GridSection
instance are rendered as readonly text by default. By setting theeditable
property of a child option element totrue
, that element is rendered as full input widget within its cell instead of a text only preview.This property has no effect on options that are not children of grid section elements.
- Default Value:
- false
-
modalonlyboolean
-
Move grid section option element into the table, the modal popup or both.
If this property is
null
(the default), the option element is displayed in both the table preview area and the per-section instance modal popup of a grid section. When it is set tofalse
the option is only shown in the table but not the modal popup. When set totrue
, the option is only visible in the modal popup but not the table.This property has no effect on options that are not children of grid section elements.
- Default Value:
- null
-
optionalboolean
-
If set to
true
, the underlying ui input widget is allowed to be empty, otherwise the option element is marked invalid when no value is entered or selected by the user.- Default Value:
- false
-
readonlyboolean
-
Make option element readonly.
This property defaults to the readonly state of the parent form element. When set to
true
, the underlying widget is rendered in disabled state, means its contents cannot be changed and the widget cannot be interacted with.- Default Value:
- false
-
rmemptyboolean
-
If set to
false
, the underlying option value is retained upon saving the form when the option element is disabled due to unsatisfied dependency constraints.- Default Value:
- true
-
uciconfigstring
-
Override the UCI configuration name to read the option value from.
By default, the configuration name is inherited from the parent Map. By setting this property, a deviating configuration may be specified.
The default is null, means inheriting from the parent form.
- Default Value:
- null
-
ucioptionstring
-
Override the UCI option name to read the value from.
By default, the elements name, which is passed as third argument to the constructor, is used as UCI option name. By setting this property, a deviating UCI option may be specified.
The default is null, means using the option element name.
- Default Value:
- null
-
ucisectionstring
-
Override the UCI section name to read the option value from.
By default, the section ID is inherited from the parent section element. By setting this property, a deviating section may be specified.
The default is null, means inheriting from the parent section.
- Default Value:
- null
-
validatefunction
-
Specifies a custom validation function to test the user input for validity. The validation function must return
true
to accept the value. Any other return value type is converted to a string and displayed to the user as validation error message.If the user entered input does not pass the validation function, the option element is marked as invalid.
- Default Value:
- null
-
widthnumber string
-
Override the cell width of a table or grid section child option.
If the property is set to a numeric value, it is treated as pixel width which is set on the containing cell element of the option, essentially forcing a certain column width. When the property is set to a string value, it is applied as-is to the CSS
width
property.This property has no effect on options that are not children of grid or table section elements.
- Default Value:
- null
Methods
-
Add another form element as children to this element.
Name Type Description element
AbstractElement The form element to add.
-
Obtain the internal ID ("cbid") of the element instance.
Since each form section element may map multiple underlying configuration sections, the configuration section ID is required to form a fully qualified ID pointing to the specific element instance within the given specific section.
Name Type Description section_id
string The configuration section ID
Throws:
-
Throws a
TypeError
exception when nosection_id
was specified. - Type
- TypeError
Returns:
Type Description string Returns the element ID. -
-
Query the underlying configuration value.
The default implementation of this method returns the cached return value of
load()
. It may be overwritten by user code to obtain the configuration value in a different way.Name Type Description section_id
string The configuration section ID
Throws:
-
Throws a
TypeError
exception when nosection_id
was specified. - Type
- TypeError
Returns:
Type Description * Returns the configuration value. -
-
Add a dependency contraint to the option.
Dependency constraints allow making the presence of option elements dependant on the current values of certain other options within the same form. An option element with unsatisfied dependencies will be hidden from the view and its current value is omitted when saving.
Multiple constraints (that is, multiple calls to
depends()
) are treated as alternatives, forming a logical "or" expression.By passing an object of name => value pairs as first argument, it is possible to depend on multiple options simultaneously, allowing to form a logical "and" expression.
Option names may be given in "dot notation" which allows to reference option elements outside of the current form section. If a name without dot is specified, it refers to an option within the same configuration section. If specified as
configname.sectionid.optionname
, options anywhere within the same form may be specified.The object notation also allows for a number of special keys which are not treated as option names but as modifiers to influence the dependency constraint evaluation. The associated value of these special "tag" keys is ignored. The recognized tags are:
-
!reverse
Invert the dependency, instead of requiring another option to be equal to the dependency value, that option should not be equal. -
!contains
Instead of requiring an exact match, the dependency is considered satisfied when the dependency value is contained within the option value. -
!default
The dependency is always satisfied
Examples:
-
opt.depends("foo", "test")
Require the value of `foo` to be `test`. -
opt.depends({ foo: "test" })
Equivalent to the previous example. -
opt.depends({ foo: "test", bar: "qrx" })
Require the value of `foo` to be `test` and the value of `bar` to be `qrx`. -
opt.depends({ foo: "test" })
opt.depends({ bar: "qrx" })
Require eitherfoo
to be set totest
, or thebar
option to beqrx
. -
opt.depends("test.section1.foo", "bar")
Require the "foo" form option within the "section1" section to be set to "bar". -
opt.depends({ foo: "test", "!contains": true })
Require the "foo" option value to contain the substring "test".
Name Type Description optionname_or_depends
string | Object.<string, (string|boolean)> The name of the option to depend on or an object describing multiple dependencies which must be satified (a logical "and" expression).
optionvalue
string When invoked with a plain option name as first argument, this parameter specifies the expected value. In case an object is passed as first argument, this parameter is ignored.
-
-
Query the current form input value.
The default implementation of this method returns the current input value of the underlying
LuCI.ui
widget. It may be overwritten by user code to handle input values differently.Name Type Description section_id
string The configuration section ID
Throws:
-
Throws a
TypeError
exception when nosection_id
was specified. - Type
- TypeError
Returns:
Type Description * Returns the current input value. -
-
getUIElement(section_id){LuCI.ui.AbstractElement|null}
-
Obtain the underlying
LuCI.ui
element instance.Name Type Description section_id
string The configuration section ID
Throws:
-
Throws a
TypeError
exception when nosection_id
was specified. - Type
- TypeError
Returns:
Type Description LuCI.ui.AbstractElement | null Returns the LuCI.ui
element instance ornull
in case the form option implementation does not useLuCI.ui
widgets. -
-
Test whether the option element is currently active.
An element is active when it is not hidden due to unsatisfied dependency constraints.
Name Type Description section_id
string The configuration section ID
Returns:
Type Description boolean Returns true
if the option element currently is active, otherwise it returnsfalse
. -
Test whether the input value is currently valid.
Name Type Description section_id
string The configuration section ID
Returns:
Type Description boolean Returns true
if the input value currently is valid, otherwise it returnsfalse
. -
Load the underlying configuration value.
The default implementation of this method reads and returns the underlying UCI option value (or the related JavaScript property for
JSONMap
instances). It may be overwritten by user code to load data from nonstandard sources.Name Type Description section_id
string The configuration section ID
Throws:
-
Throws a
TypeError
exception when nosection_id
was specified. - Type
- TypeError
Returns:
Type Description * | Promise.<*> Returns the configuration value to initialize the option element with. The return value of this function is filtered through Promise.resolve()
so it may return promises if overridden by user code. -
-
Parse the option element input.
The function is invoked when the
parse()
method has been invoked on the parent form and triggers input value reading and validation.Name Type Description section_id
string The configuration section ID
Returns:
Type Description Promise.<void> Returns a promise resolving once the input value has been read and validated or rejecting in case the input value does not meet the validation constraints. -
Remove the corresponding value from the configuration.
This function is invoked upon saving the parent form when the option element has been hidden due to unsatisfied dependencies or when the user cleared the input value and the option is marked optional.
The default implementation simply removes the associated option from the UCI configuration (or the associated JavaScript object property in case of
JSONMap
forms). It may be overwritten by user code to implement alternative removal logic, e.g. to retain the original value.Name Type Description section_id
string The configuration section ID
-
Render the form element.
The
render()
function recursively walks the form element tree and renders the markup for each element, returning the assembled DOM tree.Returns:
Type Description Node | Promise.<Node> May return a DOM Node or a promise resolving to a DOM node containing the form element's markup, including the markup of any child elements. -
Strip any HTML tags from the given input string.
Name Type Description input
string The input string to clean.
Returns:
Type Description string The cleaned input string with HTML removes removed. -
Obtain a textual input representation.
The default implementation of this method returns the HTML escaped current input value of the underlying
LuCI.ui
widget. User code or specific option element implementations may overwrite this function to apply a different logic, e.g. to returnYes
orNo
depending on the checked state of checkbox elements.Name Type Description section_id
string The configuration section ID
Throws:
-
Throws a
TypeError
exception when nosection_id
was specified. - Type
- TypeError
Returns:
Type Description string Returns the text representation of the current input value. -
-
Format the given named property as title string.
This function looks up the given named property and formats its value suitable for use as element caption or description string. It also strips any HTML tags from the result.
If the property value is a string, it is passed to
String.format()
along with any additional parameters passed totitleFn()
.If the property value is a function, it is invoked with any additional
titleFn()
parameters as arguments and the obtained return value is converted to a string.In all other cases,
null
is returned.Name Type Description property
string The name of the element property to use.
fmt_args
* repeatable Extra values to format the title string with.
Returns:
Type Description string | null The formatted title string or null
if the property did not exist or was neither a string nor a function. -
Apply custom validation logic.
This method is invoked whenever incremental validation is performed on the user input, e.g. on keyup or blur events.
The default implementation of this method does nothing and always returns
true
. User code may overwrite this method to provide additional validation logic which is not covered by data type constraints.Name Type Description section_id
string The configuration section ID
value
* The value to validate
Returns:
Type Description * The method shall return true
to accept the given value. Any other return value is treated as failure, converted to a string and displayed as error message to the user. -
Write the current input value into the configuration.
This function is invoked upon saving the parent form when the option element is valid and when its input value has been changed compared to the initial value returned by
cfgvalue()
.The default implementation simply sets the given input value in the UCI configuration (or the associated JavaScript object property in case of
JSONMap
forms). It may be overwritten by user code to implement alternative save logic, e.g. to transform the input value before it is written.Name Type Description section_id
string The configuration section ID
formvalue
string | Array.<string> The input value to write.