Class: FieldVariable | Blockly

Constructor

FieldVariable

new FieldVariable(varname, opt_validator, opt_variableTypes, opt_defaultType)

Class for a variable's dropdown field.

Parameter
varname	string The default name for the variable. If null, a unique variable name will be generated. Value may be null.
opt_validator	Optional function() A function that is executed when a new option is selected. Its sole argument is the new option value.
opt_variableTypes	Optional Array of string A list of the types of variables to include in the dropdown.
opt_defaultType	Optional string The type of variable to create if this field's value is not explicitly set. Defaults to ''.

Extends: Blockly.FieldDropdown

Properties

CURSOR

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

Inherited from: Blockly.FieldDropdown#CURSOR

EDITABLE

Editable fields are saved by the XML renderer, non-editable fields are not.

Inherited from: Blockly.Field#EDITABLE

maxDisplayLength

unknown

Maximum characters of text to display before adding an ellipsis.

Inherited from: Blockly.Field#maxDisplayLength

name

unknown

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

Inherited from: Blockly.Field#name

sourceBlock_

protected

unknown

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

Inherited from: Blockly.Field#sourceBlock_

text_

protected

unknown

Visible text to display.

Inherited from: Blockly.Field#text_

textElement_

unknown

Inherited from: Blockly.Field#textElement_

validator_

protected

unknown

Validation function called when user edits an editable field.

Inherited from: Blockly.Field#validator_

value_

protected

unknown

Language-neutral currently selected string or image object.

Inherited from: Blockly.FieldDropdown#value_

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 string

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 string Array of variable names.

fromJson

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.

callValidator

callValidator(text) returns string

Calls the validation function for this field, as well as all the validation function for the field's class and its parents.

Parameter
text	Proposed text.

Inherited from: Blockly.Field#callValidator
Returns: Revised text, or null if invalid.

classValidator

classValidator(text) returns string

Validates a change. Does nothing. Subclasses may override this.

Parameter
text	The user's text.

Inherited from: Blockly.Field#classValidator
Returns: No change needed.

dispose

public

dispose()

Dispose of this field.

forceRerender

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

getDisplayText_

protected

getDisplayText_() returns string

Get the text from this field as displayed on screen. May differ from getText due to ellipsis, and other formatting.

Inherited from: Blockly.Field#getDisplayText_
Returns: Currently displayed text.

getOptions

getOptions() returns Array of non-null Array

Return a list of the options for this dropdown.

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

getScaledBBox_

protected

getScaledBBox_() returns Object

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 goog.math.Size

Returns the height and width of the field.

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

getSvgRoot

getSvgRoot() returns Element

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.

getValidator

getValidator() returns function()

Gets the validation function for editable fields, or null if not set.

Inherited from: Blockly.Field#getValidator
Returns: Validation function, or null.

getValue

getValue() returns string

Get the variable's ID.

Returns: string Current variable's ID.

getVariable

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

public

init()

Initialize everything needed to render this field. This includes making sure that the field's value is valid.

initModel

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.

isCurrentlyEditable

isCurrentlyEditable() returns boolean

Check whether this field is currently editable. Some fields are never editable (e.g. text labels). Those fields are not serialized to XML. Other fields may be editable, and therefore serialized, but may exist on non-editable blocks.

Inherited from: Blockly.Field#isCurrentlyEditable
Returns: whether this field is editable and on an editable block

isOptionListDynamic

isOptionListDynamic() returns boolean

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

isVisible

isVisible() returns boolean

Gets whether this editable field is visible or not.

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

onItemSelected

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	goog.ui.Menu The Menu component clicked. Value must not be null.
menuItem	goog.ui.MenuItem The MenuItem selected within menu. Value must not be null.

Parameter

goog.ui.Menu

The Menu component clicked.

Value must not be null.

menuItem

goog.ui.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_

referencesVariables

referencesVariables() returns boolean

Whether this field references any Blockly variables. If true it may need to be handled differently during serialization and deserialization. Subclasses may override this.

Inherited from: Blockly.Field#referencesVariables
Returns: True if this field has any variable references.

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.

setText

setText(newText)

Set the text in this field. Trigger a rerender of the source block.

Parameter
newText	New text.

Inherited from: Blockly.Field#setText

setTooltip

setTooltip(_newTip)

Change the tooltip text for this field.

Parameter
_newTip	Text for tooltip or a parent element to link to for its tooltip.

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 text form of the users input, and optionally returns the accepted field text. Alternatively, if the function returns null, the field value change aborts. If the function does not return anything (or returns undefined), the input value is accepted as valid. This is a shorthand for fields using the validator function call as a field-level change event notification.

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

Parameter

handler

The validator function or null to clear a previous validator.

Value may be null.

Inherited from: Blockly.Field#setValidator

setValue

setValue(id)

Set the variable ID.

Parameter
id	string New variable ID, which must reference an existing variable.

setVisible

setVisible(visible)

Sets whether this editable field is visible or not.

Parameter
visible	True if visible.

Inherited from: Blockly.Field#setVisible

updateEditable

updateEditable()

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

Inherited from: Blockly.Field#updateEditable

updateWidth

updateWidth()

Updates the width of the field. Overrides field.prototype.updateWidth to deal with image selections on IE and Edge. If the selected item is not an image, or if the browser is not IE / Edge, this simply calls the parent implementation.

Inherited from: Blockly.FieldDropdown#updateWidth