CalculatedValue
The calculated value is a way to define the variable in Survey Creator. It has two main properties: name and expression. Based on expression the value read-only property is automatically calculated. The name property should be unique though all calculated values. It uses survey.getVariable/seruvey.setVariable functions to get/set its value. The class do not store its value internally. You may set includeIntoResult property to true to store this calculated value into survey result.
Inherited from the following class(es):
Methods
Creates a new object that has the same type and properties as the current SurveyJS object.
- Type:
- () => Base
- Implemented in:
- Base
The Expression that used to calculate the value. You may use standard operators like +, -, * and /, squares (). Here is the example of accessing the question value . Example: "( * ) * (100 - ) / 100"
- Type:
- string writable
This property is stored in the survey JSON definition and can be edited in the Survey Creator.
- Implemented in:
- CalculatedValue
Assigns a new configuration to the current SurveyJS object. This configuration is taken from a passed JSON object.
The JSON object should contain only serializable properties of this SurveyJS object. Event handlers and properties that do not belong to the SurveyJS object are ignored.
- Type:
- (json: any, options?: ILoadFromJSONOptions) => void
- Parameters:
-
json, type: any ,
A JSON object with properties that you want to apply to the current SurveyJS object.
options, type: ILoadFromJSONOptions ,An object with configuration options.
- Implemented in:
- Base
- See also:
- toJSON
Returns a JsonObjectProperty
object with metadata about a serializable property that belongs to the current SurveyJS object.
If the property is not found, this method returns null
.
- Type:
- (propName: string) => JsonObjectProperty
- Parameters:
-
propName, type: string ,
A property name.
- Implemented in:
- Base
Returns the value of a property with a specified name.
If the property is not found or does not have a value, this method returns either undefined
, defaultValue
specified in the property configuration, or a value passed as the defaultValue
parameter.
- Type:
- (name: string, defaultValue?: any) => any
- Parameters:
-
name, type: string ,
A property name.
defaultValue, type: any ,(Optional) A value to return if the property is not found or does not have a value.
- Implemented in:
- Base
Set this property to true to include the non-empty calculated value into survey result, survey.data property.
- Type:
- boolean writable
This property is stored in the survey JSON definition and can be edited in the Survey Creator.
- Implemented in:
- CalculatedValue
Returns true
if the object is included in a survey.
This property may return false
, for example, when you create a survey model dynamically.
- Type:
- boolean readonly
- Implemented in:
- Base
Returns true
if the survey is being designed in Survey Creator.
- Type:
- boolean readonly
- Implemented in:
- Base
Returns true
if the object configuration is being loaded from JSON.
- Type:
- boolean readonly
- Implemented in:
- Base
Returns true
if a passed value
is an empty string, array, or object or if it equals to undefined
or null
.
- Type:
- (value: any, trimString?: boolean) => boolean
- Parameters:
-
value, type: any ,
A value to be checked.
trimString, type: boolean ,(Optional) When this parameter is
true
, the method ignores whitespace characters at the beginning and end of a string value. Passfalse
to disable this functionality.
- Implemented in:
- Base
The calculated value name. It should be non empty and unique.
- Type:
- string writable
This property is stored in the survey JSON definition and can be edited in the Survey Creator.
- Implemented in:
- CalculatedValue
An event that is raised when an ItemValue
property is changed.
Parameters:
sender
:this
A SurveyJS object whose property contains an array ofItemValue
objects.options.obj
:ItemValue
AnItemValue
object.options.propertyName
:string
The name of the property to which an array ofItemValue
objects is assigned (for example,"choices"
or"rows"
).options.name
:"text"
|"value"
The name of the changed property.options.newValue
:any
A new value for the property.
- Type:
- Event<(sender: Base, options: any) => any, Base, any>
- Implemented in:
- Base
An event that is raised when a property of this SurveyJS object has changed.
Parameters:
sender
:this
A SurveyJS object whose property has changed.options.name
:string
The name of the changed property.options.newValue
:any
A new value for the property.options.oldValue
:any
An old value of the property. If the property is an array,oldValue
contains the same array asnewValue
does.
- Type:
- EventBase<Base, any>
- Implemented in:
- Base
Registers a function to call when a property value changes.
- Type:
- (propertyNames: string[], handler: any, key?: string) => void
- Parameters:
-
propertyNames, type: string[] ,
An array of one or multiple property names.
handler, type: any ,A function to call when one of the listed properties change.
key, type: string ,(Optional) A key that identifies the current registration. If a function for one of the properties is already registered with the same key, the function will be overwritten. You can also use the key to subsequently unregister handlers.
- Implemented in:
- Base
- See also:
- unregisterPropertyChangedHandlers
Assigns a new value to a specified property.
- Type:
- (name: string, val: any) => void
- Parameters:
-
name, type: string ,
A property name.
val, type: any ,A new value for the property.
- Implemented in:
- Base
Unregisters value change event handlers for the specified properties.
- Type:
- (propertyNames: string[], key?: string) => void
- Parameters:
-
propertyNames, type: string[] ,
An array of one or multiple property names.
key, type: string ,(Optional) A key of the registration that you want to cancel.
- Implemented in:
- Base
- See also:
- registerPropertyChangedHandlers
Copyright © 2024 Devsoft Baltic OÜ. All rights reserved.