Google Apps Script

Class Label

A widget that contains arbitrary text, not interpreted as HTML.

Here is an example of how to use this widget:

 
function doGet() {
   var app = UiApp.createApplication();
   app.add(app.createLabel("Hello World!"));
   return app;
 }
 

Internally, UiApp widgets are built on top of the Google Web Toolkit, and it can sometimes be helpful to look at the GWT documentation directly. You can find the Label documentation here.

Methods

MethodReturn typeBrief description
addClickHandler(handler)LabelAdd a handler for click events.
addMouseDownHandler(handler)LabelAdd a handler for mouse down events.
addMouseMoveHandler(handler)LabelAdd a handler for mouse move events.
addMouseOutHandler(handler)LabelAdd a handler for mouse out events.
addMouseOverHandler(handler)LabelAdd a handler for mouse move events.
addMouseUpHandler(handler)LabelAdd a handler for mouse up events.
addMouseWheelHandler(handler)LabelAdd a handler for mouse wheel events.
addStyleDependentName(styleName)LabelSets the dependent style name of this Label.
addStyleName(styleName)LabelAdds a style name to this Label.
getId()StringReturns the id that has been assigned to this object.
getTag()StringGets the text tag of this Label.
getType()StringGets the type of this object.
setHeight(height)LabelSets the height of this Label.
setHorizontalAlignment(horizontalAlignment)LabelSet the horizontal text alignment of the display text of this Label.
setId(id)LabelSets the id of this Label.
setPixelSize(width, height)LabelSets the size of this Label in pixels.
setSize(width, height)LabelSets the size of this Label.
setStyleAttribute(attribute, value)LabelSets one of this Label's style attributes to a new value.
setStyleAttributes(attributes)LabelSets this Label's style attributes.
setStyleName(styleName)LabelSets the style name of this Label.
setStylePrimaryName(styleName)LabelSets the primary style name of this Label.
setTag(tag)LabelSets the text tag of this Label.
setText(text)LabelSet the display text of this Label.
setTitle(title)LabelSets the hover title of this Label.
setVisible(visible)LabelSets whether this Label is visible.
setWidth(width)LabelSets the width of this Label.
setWordWrap(wordWrap)LabelSet whether this Label wraps its text.

Detailed documentation

addClickHandler(handler)

Add a handler for click events.

Note that you can have multiple handlers for the same event on the same widget. They will be called in the order that they were added to the widget, although ServerHandlers may appear to happen simultaneously.

The handler passes back some information to the server about what happened. This information can be accessed as follows:

 
function doGet() {
   var app = UiApp.createApplication();
   var button = app.createButton("a button");
   var handler = app.createServerHandler("handlerFunction");
   button.addClickHandler(handler);
   app.add(button);
   return app;
 }

 function handlerFunction(eventInfo) {
   var parameter = eventInfo.parameter;
   // the type of event, in this case "click".
   var eventType = parameter.eventType;
   // the id of the widget that fired this event.
   var source = parameter.source;
   // mouse x and y position relative to the widget that fired the event.
   var x = parameter.x;
   var y = parameter.y;
   // mouse x and y position within the browser window's client area.
   var clientX = parameter.clientX;
   var clientY = parameter.clientY;
   // mouse x and y position within the user's display.
   var screenX = parameter.screenX;
   var screenY = parameter.screenY;
   // the mouse button used. Left is 1, right is 2, and middle is 4.
   var button = parameter.button;
   // whether the various modifier keys were also pressed (true or false)
   var shift = parameter.shift;
   var alt = parameter.alt;
   var ctrl = parameter.ctrl;
   var meta = parameter.meta;
 }
 
In addition, the values of certain widgets can be sent up with the event as well, as "callback elements." See the documentation of ServerHandler for more information.

Parameters

NameTypeDescription
handlerHandlerthe handler to execute when the event occurs. This can be a ClientHandler or a ServerHandler.

Return

Label — the Label itself, useful for chaining.


addMouseDownHandler(handler)

Add a handler for mouse down events.

Note that you can have multiple handlers for the same event on the same widget. They will be called in the order that they were added to the widget, although ServerHandlers may appear to happen simultaneously.

The handler passes back some information to the server about what happened. This information can be accessed as follows:

 
function doGet() {
   var app = UiApp.createApplication();
   var button = app.createButton("a button");
   var handler = app.createServerHandler("handlerFunction");
   button.addMouseDownHandler(handler);
   app.add(button);
   return app;
 }

 function handlerFunction(eventInfo) {
   var parameter = eventInfo.parameter;
   // the type of event, in this case "mousedown".
   var eventType = parameter.eventType;
   // the id of the widget that fired this event.
   var source = parameter.source;
   // mouse x and y position relative to the widget that fired the event.
   var x = parameter.x;
   var y = parameter.y;
   // mouse x and y position within the browser window's client area.
   var clientX = parameter.clientX;
   var clientY = parameter.clientY;
   // mouse x and y position within the user's display.
   var screenX = parameter.screenX;
   var screenY = parameter.screenY;
   // the mouse button used. Left is 1, right is 2, and middle is 4.
   var button = parameter.button;
   // whether the various modifier keys were also pressed (true or false)
   var shift = parameter.shift;
   var alt = parameter.alt;
   var ctrl = parameter.ctrl;
   var meta = parameter.meta;
 }
 
In addition, the values of certain widgets can be sent up with the event as well, as "callback elements." See the documentation of ServerHandler for more information.

Parameters

NameTypeDescription
handlerHandlerthe handler to execute when the event occurs. This can be a ClientHandler or a ServerHandler.

Return

Label — the Label itself, useful for chaining.


addMouseMoveHandler(handler)

Add a handler for mouse move events.

Note that you can have multiple handlers for the same event on the same widget. They will be called in the order that they were added to the widget, although ServerHandlers may appear to happen simultaneously.

The handler passes back some information to the server about what happened. This information can be accessed as follows:

 
function doGet() {
   var app = UiApp.createApplication();
   var button = app.createButton("a button");
   var handler = app.createServerHandler("handlerFunction");
   button.addMouseMoveHandler(handler);
   app.add(button);
   return app;
 }

 function handlerFunction(eventInfo) {
   var parameter = eventInfo.parameter;
   // the type of event, in this case "mousemove".
   var eventType = parameter.eventType;
   // the id of the widget that fired this event.
   var source = parameter.source;
   // mouse x and y position relative to the widget that fired the event.
   var x = parameter.x;
   var y = parameter.y;
   // mouse x and y position within the browser window's client area.
   var clientX = parameter.clientX;
   var clientY = parameter.clientY;
   // mouse x and y position within the user's display.
   var screenX = parameter.screenX;
   var screenY = parameter.screenY;
   // the mouse button used. Left is 1, right is 2, and middle is 4.
   var button = parameter.button;
   // whether the various modifier keys were also pressed (true or false)
   var shift = parameter.shift;
   var alt = parameter.alt;
   var ctrl = parameter.ctrl;
   var meta = parameter.meta;
 }
 
In addition, the values of certain widgets can be sent up with the event as well, as "callback elements." See the documentation of ServerHandler for more information.

Parameters

NameTypeDescription
handlerHandlerthe handler to execute when the event occurs. This can be a ClientHandler or a ServerHandler.

Return

Label — the Label itself, useful for chaining.


addMouseOutHandler(handler)

Add a handler for mouse out events.

Note that you can have multiple handlers for the same event on the same widget. They will be called in the order that they were added to the widget, although ServerHandlers may appear to happen simultaneously.

The handler passes back some information to the server about what happened. This information can be accessed as follows:

 
function doGet() {
   var app = UiApp.createApplication();
   var button = app.createButton("a button");
   var handler = app.createServerHandler("handlerFunction");
   button.addMouseOutHandler(handler);
   app.add(button);
   return app;
 }

 function handlerFunction(eventInfo) {
   var parameter = eventInfo.parameter;
   // the type of event, in this case "mouseout".
   var eventType = parameter.eventType;
   // the id of the widget that fired this event.
   var source = parameter.source;
   // mouse x and y position relative to the widget that fired the event.
   var x = parameter.x;
   var y = parameter.y;
   // mouse x and y position within the browser window's client area.
   var clientX = parameter.clientX;
   var clientY = parameter.clientY;
   // mouse x and y position within the user's display.
   var screenX = parameter.screenX;
   var screenY = parameter.screenY;
   // the mouse button used. Left is 1, right is 2, and middle is 4.
   var button = parameter.button;
   // whether the various modifier keys were also pressed (true or false)
   var shift = parameter.shift;
   var alt = parameter.alt;
   var ctrl = parameter.ctrl;
   var meta = parameter.meta;
 }
 
In addition, the values of certain widgets can be sent up with the event as well, as "callback elements." See the documentation of ServerHandler for more information.

Parameters

NameTypeDescription
handlerHandlerthe handler to execute when the event occurs. This can be a ClientHandler or a ServerHandler.

Return

Label — the Label itself, useful for chaining.


addMouseOverHandler(handler)

Add a handler for mouse move events.

Note that you can have multiple handlers for the same event on the same widget. They will be called in the order that they were added to the widget, although ServerHandlers may appear to happen simultaneously.

The handler passes back some information to the server about what happened. This information can be accessed as follows:

 
function doGet() {
   var app = UiApp.createApplication();
   var button = app.createButton("a button");
   var handler = app.createServerHandler("handlerFunction");
   button.addMouseOverHandler(handler);
   app.add(button);
   return app;
 }

 function handlerFunction(eventInfo) {
   var parameter = eventInfo.parameter;
   // the type of event, in this case "mousover".
   var eventType = parameter.eventType;
   // the id of the widget that fired this event.
   var source = parameter.source;
   // mouse x and y position relative to the widget that fired the event.
   var x = parameter.x;
   var y = parameter.y;
   // mouse x and y position within the browser window's client area.
   var clientX = parameter.clientX;
   var clientY = parameter.clientY;
   // mouse x and y position within the user's display.
   var screenX = parameter.screenX;
   var screenY = parameter.screenY;
   // the mouse button used. Left is 1, right is 2, and middle is 4.
   var button = parameter.button;
   // whether the various modifier keys were also pressed (true or false)
   var shift = parameter.shift;
   var alt = parameter.alt;
   var ctrl = parameter.ctrl;
   var meta = parameter.meta;
 }
 
In addition, the values of certain widgets can be sent up with the event as well, as "callback elements." See the documentation of ServerHandler for more information.

Parameters

NameTypeDescription
handlerHandlerthe handler to execute when the event occurs. This can be a ClientHandler or a ServerHandler.

Return

Label — the Label itself, useful for chaining.


addMouseUpHandler(handler)

Add a handler for mouse up events.

Note that you can have multiple handlers for the same event on the same widget. They will be called in the order that they were added to the widget, although ServerHandlers may appear to happen simultaneously.

The handler passes back some information to the server about what happened. This information can be accessed as follows:

 
function doGet() {
   var app = UiApp.createApplication();
   var button = app.createButton("a button");
   var handler = app.createServerHandler("handlerFunction");
   button.addMouseUpHandler(handler);
   app.add(button);
   return app;
 }

 function handlerFunction(eventInfo) {
   var parameter = eventInfo.parameter;
   // the type of event, in this case "mouseup".
   var eventType = parameter.eventType;
   // the id of the widget that fired this event.
   var source = parameter.source;
   // mouse x and y position relative to the widget that fired the event.
   var x = parameter.x;
   var y = parameter.y;
   // mouse x and y position within the browser window's client area.
   var clientX = parameter.clientX;
   var clientY = parameter.clientY;
   // mouse x and y position within the user's display.
   var screenX = parameter.screenX;
   var screenY = parameter.screenY;
   // the mouse button used. Left is 1, right is 2, and middle is 4.
   var button = parameter.button;
   // whether the various modifier keys were also pressed (true or false)
   var shift = parameter.shift;
   var alt = parameter.alt;
   var ctrl = parameter.ctrl;
   var meta = parameter.meta;
 }
 
In addition, the values of certain widgets can be sent up with the event as well, as "callback elements." See the documentation of ServerHandler for more information.

Parameters

NameTypeDescription
handlerHandlerthe handler to execute when the event occurs. This can be a ClientHandler or a ServerHandler.

Return

Label — the Label itself, useful for chaining.


addMouseWheelHandler(handler)

Add a handler for mouse wheel events.

Note that you can have multiple handlers for the same event on the same widget. They will be called in the order that they were added to the widget, although ServerHandlers may appear to happen simultaneously.

The handler passes back some information to the server about what happened. This information can be accessed as follows:

 
function doGet() {
   var app = UiApp.createApplication();
   var button = app.createButton("a button");
   var handler = app.createServerHandler("handlerFunction");
   button.addMouseWheelHandler(handler);
   app.add(button);
   return app;
 }

 function handlerFunction(eventInfo) {
   var parameter = eventInfo.parameter;
   // the type of event, in this case "mousewheel".
   var eventType = parameter.eventType;
   // the id of the widget that fired this event.
   var source = parameter.source;
   // mouse x and y position relative to the widget that fired the event.
   var x = parameter.x;
   var y = parameter.y;
   // mouse x and y position within the browser window's client area.
   var clientX = parameter.clientX;
   var clientY = parameter.clientY;
   // mouse x and y position within the user's display.
   var screenX = parameter.screenX;
   var screenY = parameter.screenY;
   // the mouse button used. Left is 1, right is 2, and middle is 4.
   var button = parameter.button;
   // whether the various modifier keys were also pressed (true or false)
   var shift = parameter.shift;
   var alt = parameter.alt;
   var ctrl = parameter.ctrl;
   var meta = parameter.meta;
 }
 
In addition, the values of certain widgets can be sent up with the event as well, as "callback elements." See the documentation of ServerHandler for more information.

Parameters

NameTypeDescription
handlerHandlerthe handler to execute when the event occurs. This can be a ClientHandler or a ServerHandler.

Return

Label — the Label itself, useful for chaining.


addStyleDependentName(styleName)

Sets the dependent style name of this Label.

This is useful for debugging but is otherwise of minimal use since there is no way to use custom stylesheets in UiApp.

Parameters

NameTypeDescription
styleNameStringthe new style name.

Return

Label — the Label itself, useful for chaining.


addStyleName(styleName)

Adds a style name to this Label.

This is useful for debugging but is otherwise of minimal use since there is no way to use custom stylesheets in UiApp.

Parameters

NameTypeDescription
styleNameStringthe new style name.

Return

Label — the Label itself, useful for chaining.


getId()

Returns the id that has been assigned to this object.

This can be used in conjunction with app.getElementById() to retrieve a reference to this object.

Return

String — the id that has been assigned to this object


getTag()

Gets the text tag of this Label.

Return

String — the text tag.


getType()

Gets the type of this object.

Return

String — the object type


setHeight(height)

Sets the height of this Label.

Parameters

NameTypeDescription
heightStringthe new height in any CSS unit such as "10px" or "50%".

Return

Label — the Label itself, useful for chaining.


setHorizontalAlignment(horizontalAlignment)

Set the horizontal text alignment of the display text of this Label.

Parameters

NameTypeDescription
horizontalAlignmentHorizontalAlignmentthe desired alignment, such as UiApp.HorizontalAlignment.CENTER.

Return

Label — the Label itself, useful for chaining.


setId(id)

Sets the id of this Label.

Parameters

NameTypeDescription
idStringthe new id, which can be used to retrieve the Label from app.getElementById(id).

Return

Label — the Label itself, useful for chaining.


setPixelSize(width, height)

Sets the size of this Label in pixels.

Parameters

NameTypeDescription
widthIntegerthe new width in pixels.
heightIntegerthe new height in pixels.

Return

Label — the Label itself, useful for chaining.


setSize(width, height)

Sets the size of this Label.

Parameters

NameTypeDescription
widthStringthe new width in any CSS unit such as "10px" or "50%".
heightStringthe new height in any CSS unit such as "10px" or "50%".

Return

Label — the Label itself, useful for chaining.


setStyleAttribute(attribute, value)

Sets one of this Label's style attributes to a new value. Valid attributes are listed here; the values for each attribute are the same as those available in CSS style sheets.

 
// Change the widget's background to black and text color to green.
 widget.setStyleAttribute("background", "black")
     .setStyleAttribute("color", "green");
 

Parameters

NameTypeDescription
attributeStringthe CSS attribute, in camel-case ("fontSize", not "font-size"), as listed here
valueStringthe CSS value

Return

Label — the Label itself, useful for chaining.


setStyleAttributes(attributes)

Sets this Label's style attributes. This is a convenience method that is equivalent to calling setStyleAttribute with every key/value pair in the attributes object. Valid attributes are listed here; the values for each attribute are the same as those available in CSS style sheets.

 
// Change the widget's background to black and text color to green.
 widget.setStyleAttributes({background: "black", color: "green"});
 

Parameters

NameTypeDescription
attributesObjectan object of key/value pairs for the CSS attributes and values to set; valid attributes are listed here

Return

Label — the Label itself, useful for chaining.


setStyleName(styleName)

Sets the style name of this Label.

This is useful for debugging but is otherwise of minimal use since there is no way to use custom stylesheets in UiApp.

Parameters

NameTypeDescription
styleNameStringthe new style name.

Return

Label — the Label itself, useful for chaining.


setStylePrimaryName(styleName)

Sets the primary style name of this Label.

This is useful for debugging but is otherwise of minimal use since there is no way to use custom stylesheets in UiApp.

Parameters

NameTypeDescription
styleNameStringthe new style name.

Return

Label — the Label itself, useful for chaining.


setTag(tag)

Sets the text tag of this Label.

Parameters

NameTypeDescription
tagStringthe new text tag, which can be anything you wish to store with the widget.

Return

Label — the Label itself, useful for chaining.


setText(text)

Set the display text of this Label.

Parameters

NameTypeDescription
textStringthe new text.

Return

Label — the Label itself, useful for chaining.


setTitle(title)

Sets the hover title of this Label.

Not all browsers will show this.

Parameters

NameTypeDescription
titleStringthe hover title.

Return

Label — the Label itself, useful for chaining.


setVisible(visible)

Sets whether this Label is visible.

Parameters

NameTypeDescription
visibleBooleanwhether this Label should be visible or not.

Return

Label — the Label itself, useful for chaining.


setWidth(width)

Sets the width of this Label.

Parameters

NameTypeDescription
widthStringthe new width in any CSS unit such as "10px" or "50%".

Return

Label — the Label itself, useful for chaining.


setWordWrap(wordWrap)

Set whether this Label wraps its text.

Parameters

NameTypeDescription
wordWrapBooleanwhether to wrap.

Return

Label — the Label itself, useful for chaining.

Deprecated methods


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