Class: FieldVariable

Constructor

FieldVariable

new FieldVariable(varName, opt_validator, opt_variableTypes, opt_defaultType, opt_config)

Parameter
varName	The default name for the variable. If null, a unique variable name will be generated. Also accepts Field.SKIP_SETUP if you wish to skip setup (only used by subclasses that want to handle configuration and setting the field value after their own constructors have run).
opt_validator	Optional A function that is called to validate changes to the field's value. Takes in a variable ID & returns a validated variable ID, or null to abort the change.
opt_variableTypes	Optional A list of the types of variables to include in the dropdown. Will only be used if opt_config is not provided.
opt_defaultType	Optional The type of variable to create if this field's value is not explicitly set. Defaults to ''. Will only be used if opt_config is not provided.
opt_config	Optional A map of options used to configure the field. See the field creation documentation for a list of properties this parameter supports.

Extends: Blockly.FieldDropdown

Properties

borderRect_

protected

unknown

The rendered field's SVG border element.

Inherited from: Blockly.Field#borderRect_

clickTarget_

protected

unknown

The element the click handler is bound to.

Inherited from: Blockly.Field#clickTarget_

constants_

protected

unknown

Constants associated with the source block's renderer.

Inherited from: Blockly.Field#constants_

CURSOR

unknown

Mouse cursor style when over the hotspot that initiates the editor.

Inherited from: Blockly.FieldDropdown#CURSOR

DEFAULT_VALUE

protected

unknown

The default value for this field.

Inherited from: Blockly.Field#DEFAULT_VALUE

defaultVariableName

string

The initial variable name passed to this field's constructor, or an empty string if a name wasn't provided. Used to create the initial variable.

disposed

package

unknown

Has this field been disposed of?

Inherited from: Blockly.Field#disposed

EDITABLE

unknown

Editable fields usually show some sort of UI indicating they are editable. They will also be saved by the serializer.

Inherited from: Blockly.Field#EDITABLE

enabled_

protected

unknown

Can the field value be changed using the editor on an editable block?

Inherited from: Blockly.Field#enabled_

fieldGroup_

protected

unknown

The rendered field's SVG group element.

Inherited from: Blockly.Field#fieldGroup_

isDirty_

protected

unknown

Does this block need to be re-rendered?

Inherited from: Blockly.Field#isDirty_

maxDisplayLength

unknown

Maximum characters of text to display before adding an ellipsis.

Inherited from: Blockly.Field#maxDisplayLength

menu_

protected

unknown

The dropdown menu.

Inherited from: Blockly.FieldDropdown#menu_

menuGenerator_

protected

(non-null Array of non-null Array or non-null function(this = FieldDropdown) returns non-null Array of non-null Array)

An array of options for a dropdown list, or a function which generates these options.

name

unknown

Name of field. Unique within each block. Static labels are usually unnamed.

Inherited from: Blockly.Field#name

prefixField

package

unknown

The prefix field label, of common words set after options are trimmed.

Inherited from: Blockly.FieldDropdown#prefixField

SERIALIZABLE

boolean

Serializable fields are saved by the serializer, non-serializable fields are not. Editable fields should also be serializable.

size_

protected

unknown

The size of the area rendered by the field.

Inherited from: Blockly.Field#size_

sourceBlock_

protected

unknown

Block this field is attached to. Starts as null, then set in init.

Inherited from: Blockly.Field#sourceBlock_

suffixField

package

unknown

The suffix field label, of common words set after options are trimmed.

Inherited from: Blockly.FieldDropdown#suffixField

textContent_

protected

unknown

The rendered field's text content element.

Inherited from: Blockly.Field#textContent_

textElement_

unknown

Inherited from: Blockly.FieldDropdown#textElement_

validator_

protected

unknown

Validation function called when user edits an editable field.

Inherited from: Blockly.Field#validator_

value_

protected

unknown

A generic value possessed by the field. Should generally be non-null, only null when the field is created.

Inherited from: Blockly.Field#value_

variable_

non-null Blockly.VariableModel

variableTypes

nullable Array of string

All of the types of variables that will be available in this field's dropdown.

visible_

protected

unknown

Is the field visible, or hidden due to the block being collapsed?

Inherited from: Blockly.Field#visible_

Methods

dropdownCreate

static

dropdownCreate() returns Array of non-null Array

Return a sorted list of variable names for variable dropdown menus. Include a special option at the end for creating a new variable name.

Returns: non-null Array of non-null Array Array of variable names/id tuples.

fromJson

package static

fromJson(options) returns Blockly.FieldVariable

Construct a FieldVariable from a JSON arg object, dereferencing any string table references.

Parameter
options	Object A JSON object with options (variable, variableTypes, and defaultType). Value must not be null.

Parameter

options

Object

A JSON object with options (variable, variableTypes, and defaultType).

Value must not be null.

Returns: non-null Blockly.FieldVariable The new field instance.

applyColour

package

applyColour()

Updates the dropdown arrow to match the colour/style of the block.

Inherited from: Blockly.FieldDropdown#applyColour

bindEvents_

protected

bindEvents_()

Bind events to the field. Can be overridden by subclasses if they need to do custom input handling.

Inherited from: Blockly.Field#bindEvents_

configure_

protected

configure_(config)

Configure the field based on the given map of options.

Parameter
config	Object A map of options to configure the field based on. Value must not be null.

Parameter

config

Object

A map of options to configure the field based on.

Value must not be null.

createBorderRect_

protected

createBorderRect_()

Create a field border rect element. Not to be overridden by subclasses. Instead modify the result of the function inside initView, or create a separate function to call.

Inherited from: Blockly.Field#createBorderRect_

createSVGArrow_

protected

createSVGArrow_()

Create an SVG based arrow.

Inherited from: Blockly.FieldDropdown#createSVGArrow_

createTextArrow_

protected

createTextArrow_()

Create a tspan based arrow.

Inherited from: Blockly.FieldDropdown#createTextArrow_

createTextElement_

protected

createTextElement_()

Create a field text element. Not to be overridden by subclasses. Instead modify the result of the function inside initView, or create a separate function to call.

Inherited from: Blockly.Field#createTextElement_

dispose

package

dispose()

Dispose of all DOM objects and events belonging to this editable field.

Inherited from: Blockly.Field#dispose

doClassValidation_

protected

doClassValidation_(opt_newValue) returns string

Ensure that the ID belongs to a valid variable of an allowed type.

Parameter
opt_newValue	Optional any type The ID of the new variable to set.

Parameter

opt_newValue

Optional

any type

The ID of the new variable to set.

Returns: nullable string The validated ID, or null if invalid.

doValueInvalid_

protected

doValueInvalid_(_invalidValue)

Used to notify the field an invalid value was input. Can be overridden by subclasses, see FieldTextInput. No-op by default.

Parameter
_invalidValue	The input value that was determined to be invalid.

Inherited from: Blockly.Field#doValueInvalid_

doValueUpdate_

protected

doValueUpdate_(newId)

Update the value of this variable field, as well as its variable and text.

The variable ID should be valid at this point, but if a variable field validator returns a bad ID, this could break.

Parameter
newId	any type The value to be saved.

Parameter

newId

any type

The value to be saved.

forceRerender

package

forceRerender()

Force a rerender of the block that this field is installed on, which will rerender this field and adjust for any sizing changes. Other fields on the same block will not rerender, because their sizes have already been recorded.

Inherited from: Blockly.Field#forceRerender

fromXml

fromXml(fieldElement)

Initialize this field based on the given XML.

Parameter
fieldElement	Element The element containing information about the variable field's state. Value must not be null.

Parameter

fieldElement

Element

The element containing information about the variable field's state.

Value must not be null.

getAbsoluteXY_

protected

getAbsoluteXY_() returns Blockly.utils.Coordinate

Return the absolute coordinates of the top-left corner of this field. The origin (0,0) is the top-left corner of the page body.

Inherited from: Blockly.Field#getAbsoluteXY_
Returns: Object with .x and .y properties.

getClickTarget_

protected

getClickTarget_() returns Element

The element to bind the click handler to. If not set explicitly, defaults to the SVG root of the field. When this element is clicked on an editable field, the editor will open.

Inherited from: Blockly.Field#getClickTarget_
Returns: Element to bind click handler to.

getConstants

getConstants() returns Blockly.blockRendering.ConstantProvider

Get the renderer constant provider.

Inherited from: Blockly.Field#getConstants
Returns: The renderer constant provider.

getDisplayText_

protected

getDisplayText_() returns string

Get the text from this field to display on the block. May differ from getText due to ellipsis, and other formatting.

Inherited from: Blockly.Field#getDisplayText_
Returns: Text to display.

getFlipRtl

getFlipRtl() returns boolean

Returns whether or not we should flip the field in RTL.

Inherited from: Blockly.Field#getFlipRtl
Returns: True if we should flip in RTL.

getOptions

getOptions(opt_useCache) returns Array of non-null Array

Return a list of the options for this dropdown.

Parameter
opt_useCache	Optional For dynamic options, whether or not to use the cached options or to re-generate them.

Parameter

opt_useCache

Optional

For dynamic options, whether or not to use the cached options or to re-generate them.

Inherited from: Blockly.FieldDropdown#getOptions
Throws: If generated options are incorrectly structured.
Returns: A non-empty array of option tuples: (human-readable text or image, language-neutral name).

getParentInput

package

getParentInput() returns Blockly.Input

Search through the list of inputs and their fields in order to find the parent input of a field.

Inherited from: Blockly.Field#getParentInput
Returns: The input that the field belongs to.

getScaledBBox

package

getScaledBBox() returns Blockly.utils.Rect

Returns the bounding box of the rendered field, accounting for workspace scaling.

Inherited from: Blockly.Field#getScaledBBox
Returns: An object with top, bottom, left, and right in pixels relative to the top left corner of the page (window coordinates).

getSize

getSize() returns Blockly.utils.Size

Returns the height and width of the field.

This should in general be the only place render_ gets called from.

Inherited from: Blockly.Field#getSize
Returns: Height and width.

getSourceBlock

getSourceBlock() returns Blockly.Block

Get the block this field is attached to.

Inherited from: Blockly.Field#getSourceBlock
Implements: Blockly.IASTNodeLocationWithBlock#getSourceBlock
Returns: The block containing this field.

getSvgRoot

getSvgRoot() returns SVGGElement

Gets the group element for this editable field. Used for measuring the size and for positioning.

Inherited from: Blockly.Field#getSvgRoot
Returns: The group element.

getText

getText() returns string

Get the text from this field, which is the selected variable's name.

Returns: string The selected variable's name, or the empty string if no variable is selected.

getTooltip

getTooltip() returns string

Returns the tooltip text for this field.

Inherited from: Blockly.Field#getTooltip
Returns: The tooltip text for this field.

getValidator

getValidator() returns function()

Gets the validation function for this field, or null if not set. Returns null if the variable is not set, because validators should not run on the initial setValue call, because the field won't be attached to a block and workspace at that point.

Returns: nullable function() Validation function, or null.

getValue

getValue() returns string

Get the variable's ID.

Returns: nullable string Current variable's ID.

getVariable

package

getVariable() returns Blockly.VariableModel

Get the variable model for the selected variable. Not guaranteed to be in the variable map on the workspace (e.g. if accessed after the variable has been deleted).

Returns: nullable Blockly.VariableModel The selected variable, or null if none was selected.

init

package read-only

init()

Initialize everything to render this field. Override methods initModel and initView rather than this method.

Inherited from: Blockly.Field#init

initModel

package

initModel()

Initialize the model for this field if it has not already been initialized. If the value has not been set to a variable by the first render, we make up a variable rather than let the value be invalid.

initView

package

initView()

Create the block UI for this dropdown.

Inherited from: Blockly.FieldDropdown#initView

isClickable

isClickable() returns boolean

Check whether this field defines the showEditor_ function.

Inherited from: Blockly.Field#isClickable
Returns: Whether this field is clickable.

isCurrentlyEditable

isCurrentlyEditable() returns boolean

Check whether this field is currently editable. Some fields are never EDITABLE (e.g. text labels). Other fields may be EDITABLE but may exist on non-editable blocks or be currently disabled.

Inherited from: Blockly.Field#isCurrentlyEditable
Returns: Whether this field is currently enabled, editable and on an editable block.

isEnabled

isEnabled() returns boolean

Check whether this field's value can be changed using the editor when the source block is editable.

Inherited from: Blockly.Field#isEnabled
Returns: Whether this field is enabled.

isOptionListDynamic

isOptionListDynamic() returns boolean

Inherited from: Blockly.FieldDropdown#isOptionListDynamic
Returns: True if the option list is generated by a function. Otherwise false.

isSerializable

isSerializable() returns boolean

Check whether this field should be serialized by the XML renderer. Handles the logic for backwards compatibility and incongruous states.

Inherited from: Blockly.Field#isSerializable
Returns: Whether this field should be serialized or not.

isTabNavigable

isTabNavigable() returns boolean

Returns whether or not the field is tab navigable.

Inherited from: Blockly.Field#isTabNavigable
Returns: True if the field is tab navigable.

isVisible

isVisible() returns boolean

Gets whether this editable field is visible or not.

Inherited from: Blockly.Field#isVisible
Returns: True if visible.

loadLegacyState

loadLegacyState(callingClass, state) returns boolean

Loads the given state using either the old XML hoooks, if they should be used. Returns true to indicate loading has been handled, false otherwise.

Parameter
callingClass	The class calling this method. Used to see if `this` has overridden any relevant hooks.
state	The state to apply to the field.

Inherited from: Blockly.Field#loadLegacyState
Returns: Whether the state was applied or not.

markDirty

package

markDirty()

Inherited from: Blockly.Field#markDirty

onItemSelected_

protected

onItemSelected_(menu, menuItem)

Handle the selection of an item in the variable dropdown menu. Special case the 'Rename variable...' and 'Delete variable...' options. In the rename case, prompt the user for a new name.

Parameter
menu	Blockly.Menu The Menu component clicked. Value must not be null.
menuItem	Blockly.MenuItem The MenuItem selected within menu. Value must not be null.

Parameter

Blockly.Menu

The Menu component clicked.

Value must not be null.

menuItem

Blockly.MenuItem

The MenuItem selected within menu.

Value must not be null.

onMouseDown_

protected

onMouseDown_(e)

Handle a mouse down event on a field.

Parameter
e	Mouse down event. Value must not be null.

Inherited from: Blockly.Field#onMouseDown_

onShortcut

public

onShortcut(_shortcut) returns boolean

Handles the given keyboard shortcut.

Parameter
_shortcut	The shortcut to be handled. Value must not be null.

Parameter

_shortcut

The shortcut to be handled.

Value must not be null.

Inherited from: Blockly.Field#onShortcut
Implements: Blockly.IKeyboardAccessible#onShortcut
Returns: True if the shortcut has been handled, false otherwise.

positionBorderRect_

protected

positionBorderRect_()

Position a field's border rect after a size change.

Inherited from: Blockly.Field#positionBorderRect_

positionTextElement_

protected

positionTextElement_(xOffset, contentWidth)

Position a field's text element after a size change. This handles both LTR and RTL positioning.

Parameter
xOffset	x offset to use when positioning the text element.
contentWidth	The content width.

Inherited from: Blockly.Field#positionTextElement_

referencesVariables

package

referencesVariables() returns boolean

Overrides referencesVariables(), indicating this field refers to a variable.

Inherited from: Blockly.Field#referencesVariables
Returns: True.

refreshVariableName

package

refreshVariableName()

Refreshes the name of the variable by grabbing the name of the model. Used when a variable gets renamed, but the ID stays the same. Should only be called by the block.

Inherited from: Blockly.Field#refreshVariableName

render_

protected

render_()

Draws the border with the correct width.

Inherited from: Blockly.FieldDropdown#render_

saveLegacyState

protected

saveLegacyState(callingClass) returns string

Returns a stringified version of the XML state, if it should be used. Otherwise this returns null, to signal the field should use its own serialization.

Parameter
callingClass	The class calling this method. Used to see if `this` has overridden any relevant hooks.

Inherited from: Blockly.Field#saveLegacyState
Returns: The stringified version of the XML state, or null.

saveState

package

saveState(doFullSerialization) returns any type

Saves this field's value.

Parameter
doFullSerialization	Optional If true, the variable field will serialize the full state of the field being referenced (ie ID, name, and type) rather than just a reference to it (ie ID).

Parameter

doFullSerialization

Optional

If true, the variable field will serialize the full state of the field being referenced (ie ID, name, and type) rather than just a reference to it (ie ID).

Inherited from: Blockly.Field#saveState
Returns: The state of the variable field.

setCursorSvg

package

setCursorSvg(cursorSvg)

Add the cursor SVG to this fields SVG group.

Parameter
cursorSvg	The SVG root of the cursor to be added to the field group.

Inherited from: Blockly.Field#setCursorSvg
Implements: Blockly.IASTNodeLocationSvg#setCursorSvg

setEnabled

setEnabled(enabled)

Set whether this field's value can be changed using the editor when the source block is editable.

Parameter
enabled	True if enabled.

Inherited from: Blockly.Field#setEnabled

setMarkerSvg

package

setMarkerSvg(markerSvg)

Add the marker SVG to this fields SVG group.

Parameter
markerSvg	The SVG root of the marker to be added to the field group.

Inherited from: Blockly.Field#setMarkerSvg
Implements: Blockly.IASTNodeLocationSvg#setMarkerSvg

setSourceBlock

setSourceBlock(block)

Attach this field to a block.

Parameter
block	Blockly.Block The block containing this field. Value must not be null.

Parameter

block

Blockly.Block

The block containing this field.

Value must not be null.

setTooltip

setTooltip(newTip)

Sets the tooltip for this field.

Parameter
newTip	The text for the tooltip, a function that returns the text for the tooltip, a parent object whose tooltip will be used, or null to display the tooltip of the parent block. To not display a tooltip pass the empty string. Value may be null.

Parameter

newTip

The text for the tooltip, a function that returns the text for the tooltip, a parent object whose tooltip will be used, or null to display the tooltip of the parent block. To not display a tooltip pass the empty string.

Value may be null.

Inherited from: Blockly.Field#setTooltip

setValidator

setValidator(handler)

Sets a new validation function for editable fields, or clears a previously set validator.

The validator function takes in the new field value, and returns validated value. The validated value could be the input value, a modified version of the input value, or null to abort the change.

If the function does not return anything (or returns undefined) the new value is accepted as valid. This is to allow for fields using the validated function as a field-level change event notification.

Parameter
handler	The validator function or null to clear a previous validator.

Inherited from: Blockly.Field#setValidator

setValue

read-only

setValue(newValue)

Used to change the value of the field. Handles validation and events. Subclasses should override doClassValidation_ and doValueUpdate_ rather than this method.

Parameter
newValue	New value.

Inherited from: Blockly.Field#setValue

setVisible

package

setVisible(visible)

Sets whether this editable field is visible or not. Should only be called by input.setVisible.

Parameter
visible	True if visible.

Inherited from: Blockly.Field#setVisible

shouldAddBorderRect_

protected

shouldAddBorderRect_() returns boolean

Whether or not the dropdown should add a border rect.

Inherited from: Blockly.FieldVariable#shouldAddBorderRect_
Returns: True if the dropdown field should add a border rect.

showEditor

package read-only

showEditor(opt_e)

Calls showEditor_ when the field is clicked if the field is clickable. Do not override.

Parameter
opt_e	Optional Optional mouse event that triggered the field to open, or undefined if triggered programmatically.

Parameter

opt_e

Optional

Optional mouse event that triggered the field to open, or undefined if triggered programmatically.

Inherited from: Blockly.Field#showEditor

showEditor_

protected

showEditor_(opt_e)

Create a dropdown menu under the text.

Parameter
opt_e	Optional Optional mouse event that triggered the field to open, or undefined if triggered programmatically.

Parameter

opt_e

Optional

Optional mouse event that triggered the field to open, or undefined if triggered programmatically.

Inherited from: Blockly.FieldDropdown#showEditor_

toXml

toXml(fieldElement) returns Element

Serialize this field to XML.

Parameter
fieldElement	Element The element to populate with info about the field's state. Value must not be null.

Parameter

fieldElement

Element

The element to populate with info about the field's state.

Value must not be null.

Returns: non-null Element The element containing info about the field's state.

updateEditable

updateEditable()

Add or remove the UI indicating if this field is editable or not.

Inherited from: Blockly.Field#updateEditable

updateMarkers_

protected

updateMarkers_()

Redraw any attached marker or cursor svgs if needed.

Inherited from: Blockly.Field#updateMarkers_

updateSize_

protected

updateSize_(opt_margin)

Updates the size of the field based on the text.

Parameter
opt_margin	Optional margin to use when positioning the text element.

Parameter

opt_margin

Optional

margin to use when positioning the text element.

Inherited from: Blockly.Field#updateSize_