Search

User Manual

GETTING STARTED


MODULES AND PLATFORM


APPENDIX


TUTORIALS & HELPFUL TRICKS


GLOSSARY


STRATEGIC PARTNER LINKS

Sepasoft - MES Modules
Cirrus Link - MQTT Modules

RESOURCES

Inductive University
Ignition Demo Project
Knowledge Base Articles
Forum
IA Support
SDK Documentation
SDK Examples

ALL MANUAL VERSIONS

Ignition 8.1
Ignition 7.9
Ignition 7.8

Deprecated Pages

Skip to end of metadata
Go to start of metadata


General

Component Palette Icon:



IULocgo


Dropdown

Description

The Dropdown component is a great way to display a list of choices in a limited amount of space. The current selection is shown, and the choices are only presented when the user clicks on the dropdown button. The choices that are shown depend on the data property. This is a dataset, which can be typed in manually in the Designer, or (more commonly) it can be populated dynamically from a property binding, often a SQL Query binding.

It is often the case that you want to display choices to the user that are 'dressed up' versions of the actual choices. For instance, suppose that you are selecting choices for a downtime tracking entry. The choices might be: "Operator Error", "Machine Malfunction", and "Other". But, you really want to map these choices to some numeric code which is how the choice is stored. So, for instance, when the user chooses "Other" you really want to get the number 3. The dropdown component is perfect for such a use. The data property can be set up in one of three fashions, which control how the "selected values" properties change.

The three ways to set up the data dataset and the corresponding behavior is as follows:

Scenario 1: One column with a set of string values

Column1
Apples
Oranges
Bananas
  • Drop down displays values from the first column
  • Selected value is undefined
  • Selected String Value represents value from first column
  • Selected Label represents value from first column

Scenario 2: Two column with an integer and string column

Column1Column2
201Apples
202Oranges
203Bananas
  • Dropdown displays values from the second column
  • Selected Value represents a value from the first column
  • Selected String Value represents value from second column
  • Selected Label represents value from second column

Scenario 3: Two column with two string columns

Column1Column2
APLApples
ORNOranges
BANBananas
  • Dropdown displays values from second column
  • Selected Value is undefined
  • Selected String Value represents value from first column
  • Selected Label represents value from second column

The dropdown component can operate in one of three Selection Modes. These modes affect how the dropdown's current selection (defined by the values of its Selected Value, Selected String Value, and Selected Label properties) behave when the selection properties are set to values not present in the choice list, or conversely, when the choice list is set to a new dataset that doesn't contain the current selection:

Strict. Selected values must always correlate to an option in the list defined by the Data property. If an invalid selection is set (via a binding or a script), the selection will be set to the values defined by the No Selection properties. If the Data property is set to a list that does not contain the current selection, the current selection will be reset to the No Selection values.

Lenient. (default) Selected values are independent of the list defined by the Data property. This mode is useful to avoid race conditions that can cause problems in Strict mode when both the Data and the Selected Value properties are bound. If the current selection is not present in the Data list, the read-only property Selected Index will be -1.

Editable. The same selection rules as defined by Lenient mode, except that the dropdown itself becomes editable, allowing a user to type in their own arbitrary value. This value will be set as the dropdown's Selected Label.

Properties
NameDescriptionProperty TypeScriptingCategory
Background ColorThe background color of the component.Color.backgroundAppearance
Border

The border surrounding this component. Options are: No border, Etched (Lowered), Etched (Raised), Bevel (Lowered), Bevel (Raised), Bevel (Double), Button Border, Field Border, Line Border, and Other Border.

The border is unaffected by rotation.

Border.borderCommon
CursorThe mouse cursor to use when hovering over this component. Options are: Default, Crosshair, Text, Wait, Hand, Move, SW Resize, or SE Resize.int.cursorCodeCommon
DataThe data which fills up the combo box. Either a one-column or two-column DataSet, with the first column being the value, and the second being the displayDataset.dataData
Dropdown Display ModeChanges the dropdown's display.int.modeAppearance
EnabledIf disabled, a component cannot be used.boolean.componentEnabledCommon
FontFont of text on this component.Font.fontAppearance
Foreground ColorThe foreground color of the component.Color.foregroundAppearance
Hide Table Columns?A comma separated list of columns to hide from the dropdown table, for example, "0,2" (only used in table mode).String.hideTableColumnsAppearance
Horizontal AlignmentDetermines the alignment of the contents along the X axis.int.horizontalAlignmentLayout
Max Row CountThe number of rows to display in the dropdown list before displaying a scrollbar.int.maximumRowCountAppearance
Max Table HeightThe maximum height allowed for the dropdown table (only used in table mode).int.maxTableHeightAppearance
Max Table WidthThe maximum width allowed for the dropdown table (only used in table mode).int.maxTableWidthAppearance
Mouseover TextThe text that is displayed in the tooltip which pops up on mouseover of this component.String.toolTipTextCommon
NameThe name of this component.String.nameCommon
No Selection LabelThe label to display when nothing is selected.String.noSelectionLabelBehavior
No Selection StringThe string value when nothing is selected.String.noSelectionStringBehavior
No Selection ValueThe value when nothing is selected.int.noSelectionValueBehavior
QualityThe data quality code for any Tag bindings on this component.QualityCode.qualityData
Row Height

This feature is new in Ignition version 8.0.16
Click here to check out the other new features

Determines the height of each item in the dropdown list. The default is 16 pixels.

int.rowHeightAppearance
Selected IndexThe index of the selected item. (Read only. Usable in bindings and scripting.)int.selectedIndexUncategorized
Selected LabelThe currently selected label.String.selectedLabelData
Selected String ValueThe currently selected value, if the value column is a string.String.selectedStringValueData
Selected ValueThe currently selected value.Integer.selectedValueData
Selection BackgroundThe background color of a selected cell in the dropdown list.Color.selectionBackgroundAppearance
Selection ModeThe selection mode determines the behavior of the dropdown: whether its selected value must strictly be in the underlying set of choices, whether it is flexible, or even user-editable.int.selectionModeBehavior
Show Table Header?Selects whether or not the dropdown table header is displayed (only used in table mode).boolean.showTableHeaderAppearance
StylesContains the component's styles.Dataset.stylesAppearance
Vertical AlignmentDetermines the alignment of the contents along the Y axis.int.verticalAlignmentLayout
VisibleIf disabled, the component will be hidden.boolean.visibleCommon
Deprecated Properties
Data QualityThe data quality code for any Tag bindings on this component.int.dataQualityDeprecated
Scripting
Scripting Functions

This component does not have scripting functions associated with it.

Extension Functions

This component does not have extension functions associated with it.

Event Handlers
 focus
 focusGained

This event occurs when a component that can receive input, such as a text box, receives the input focus. This usually occurs when a user clicks on the component or tabs over to it.

.source

The component that fired this event.       

.oppositeComponent

The other component involved in this focus change. That is, the component that lost focus in order for this one to gain it, or vise versa.       

 focusLost

This event occurs when a component that had the input focus lost it to another component.

.sourceThe component that fired this event
.oppositeComponentThe other component involved in this focus change. That is, the component that lost focus in order for this one to gain it, or vise versa.       
 key
 keyPressed

An integer that indicates whether the state was changed to "Selected" (on) or "Deselected" (off). Compare this to the event object's constants to determine what the new state is.

.source

The component that fired this event.       

.keyCode

The key code for this event. Used with the keyPressed and keyReleased events. See below for the key code constants.       

.keyCharThe character that was typed. Used with the keyTyped event.       
.keyLocation

Returns the location of the key that originated this key event. Some keys occur more than once on a keyboard, e.g. the left and right shift keys. Additionally, some keys occur on the numeric keypad. This provides a way of distinguishing such keys. See the KEY_LOCATION constants, the keyTyped event always has a location of KEY_LOCATION_UNKNOWN.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.    

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.  

 keyReleased

Fires when a key is released and the source component has the input focus. Works for all characters, including non-printable ones, such as SHIFT and F3.

.source

The component that fired this event.       

.keyCode

The key code for this event. Used with the keyPressed and keyReleased events. See below for the key code constants.       

.keyCharThe character that was typed. Used with the keyTyped event.       
.keyLocation

Returns the location of the key that originated this key event. Some keys occur more than once on a keyboard, e.g. the left and right shift keys. Additionally, some keys occur on the numeric keypad. This provides a way of distinguishing such keys. See the KEY_LOCATION constants in the documentation, the keyTyped event always has a location of KEY_LOCATION_UNKNOWN.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.    

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.  

 keyTyped

Fires when a key is pressed and then released when source component has the input focus. Only works for characters that can be printed on the screen.

.source

The component that fired this event.       

.keyCode

The key code for this event. Used with the keyPressed and keyReleased events. See below for the key code constants.       

.keyCharThe character that was typed. Used with the keyTyped event.       
.keyLocation

Returns the location of the key that originated this key event. Some keys occur more than once on a keyboard, e.g. the left and right shift keys. Additionally, some keys occur on the numeric keypad. This provides a way of distinguishing such keys. See the KEY_LOCATION constants in the documentation, the keyTyped event always has a location of KEY_LOCATION_UNKNOWN.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.    

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.  

 mouse
 mouseClicked

This event signifies a mouse click on the source component. A mouse click the combination of a mouse press and a mouse release, both of which must have occurred over the source component. Note that this event fires after the pressed and released events have fired.

.source

The component that fired this event.       

.button

The code for the button that caused this event to fire.       

.clickCount

The number of mouse clicks associated with this event.       

.x

The x-coordinate (with respect to the source component) of this mouse event.       

.y

The y-coordinate (with respect to the source component) of this mouse event.       

.popupTrigger

Returns True (1) if this mouse event is a popup trigger. What constitutes a popup trigger is operating system dependent, which is why this abstraction exists.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.       

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.       

 mouseEntered

This event fires when the mouse enters the space over the source component.

.source

The component that fired this event.       

.button

The code for the button that caused this event to fire.       

.clickCount

The number of mouse clicks associated with this event.       

.x

The x-coordinate (with respect to the source component) of this mouse event.       

.y

The y-coordinate (with respect to the source component) of this mouse event.       

.popupTrigger

Returns True (1) if this mouse event is a popup trigger. What constitutes a popup trigger is operating system dependent, which is why this abstraction exists.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.       

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.       

 mouseExited

  This event fires when the mouse leaves the space over the source component.

.source

The component that fired this event.       

.button

The code for the button that caused this event to fire.       

.clickCount

The number of mouse clicks associated with this event.       

.x

The x-coordinate (with respect to the source component) of this mouse event.       

.y

The y-coordinate (with respect to the source component) of this mouse event.       

.popupTrigger

Returns True (1) if this mouse event is a popup trigger. What constitutes a popup trigger is operating system dependent, which is why this abstraction exists.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.       

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.       

 mousePressed

  This event fires when a mouse button is pressed down on the source component.

.source

The component that fired this event.       

.button

The code for the button that caused this event to fire.       

.clickCount

The number of mouse clicks associated with this event.       

.x

The x-coordinate (with respect to the source component) of this mouse event.       

.y

The y-coordinate (with respect to the source component) of this mouse event.       

.popupTrigger

Returns True (1) if this mouse event is a popup trigger. What constitutes a popup trigger is operating system dependent, which is why this abstraction exists.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.       

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.       

 mouseReleased

This event fires when a mouse button is released, if that mouse button's press happened over this component.

.source

The component that fired this event.       

.button

The code for the button that caused this event to fire.       

.clickCount

The number of mouse clicks associated with this event.       

.x

The x-coordinate (with respect to the source component) of this mouse event.       

.y

The y-coordinate (with respect to the source component) of this mouse event.       

.popupTrigger

Returns True (1) if this mouse event is a popup trigger. What constitutes a popup trigger is operating system dependent, which is why this abstraction exists.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.       

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.       

 mouseMotion
 mouseDragged

Fires when the mouse moves over a component after a button has been pushed.

.source

The component that fired this event.       

.button

The code for the button that caused this event to fire.       

.clickCount

The number of mouse clicks associated with this event.       

.x

The x-coordinate (with respect to the source component) of this mouse event.       

.y

The y-coordinate (with respect to the source component) of this mouse event.       

.popupTrigger

Returns True (1) if this mouse event is a popup trigger. What constitutes a popup trigger is operating system dependent, which is why this abstraction exists.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.       

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.       

 mouseMoved

Fires when the mouse moves over a component, but no buttons are pushed.


.source

The component that fired this event.       

.button

The code for the button that caused this event to fire.       

.clickCount

The number of mouse clicks associated with this event.       

.x

The x-coordinate (with respect to the source component) of this mouse event.       

.y

The y-coordinate (with respect to the source component) of this mouse event.       

.popupTrigger

Returns True (1) if this mouse event is a popup trigger. What constitutes a popup trigger is operating system dependent, which is why this abstraction exists.       

.altDown

True (1) if the Alt key was held down during this event, false (0) otherwise.       

.controlDown

True (1) if the Control key was held down during this event, false (0) otherwise.       

.shiftDown

True (1) if the Shift key was held down during this event, false (0) otherwise.       

 propertyChange
 propertyChange

Fires whenever a bindable property of the source component changes. This works for standard and custom (dynamic) properties.

.sourceThe component that fired this event.  
.newValueThe new value that this property changed to.
.oldValueThe value that this property was before it changed.
.propertyName

The name of the property that changed.

Remember to always filter out these events for the property that you are looking for! Components often have many properties that change.

      
Examples
Code Snippet
#The following code will return the first column value of the selection.
#This code would be on a button in the same container as the dropdown.

selRow = event.source.parent.getComponent('Dropdown').selectedIndex
pyData = system.dataset.toPyDataSet(event.source.parent.getComponent('Dropdown').data)
code = pyData[selRow][0]
print code
Display Multiple Columns in Dropdown

Property NameValue
Dropdown Display ModeTable
Show Table HeaderFalse
  • No labels