The Button object creates a form button which the user can click to perform an action.
Form controls are actual HTML elements floating above the game canvas in the HTML page. Therefore, nothing can be displayed on top of a form control, apart from other form controls.
Form controls position themselves according to the layer parallax, scale and so on. However they are not truly "in the game" (since they float above), so it is recommended to avoid using scrolling, parallax and layer scaling with form controls, otherwise the end result can feel unnatural.
Styling Button objects
Button controls can be customised in a huge number of ways via CSS (Cascading Style Sheets). Rather than adding actions to set all of the possible properties, the Button object exposes a Set CSS style action. Knowing CSS will of course be an advantage here, but it is simple to use for simple properties. A few examples are listed below.
Make the text red: Set "color" to "red"
Make the background yellow: Set "background-color" to "yellow"
Make the border a thick light grey: Set "border" to "3px solid #AAAAAA"
Make the font bigger: Set "font-size" to "2em"
Make a dashed red border: Set "border* to "2px dashed red"
Button properties
Text
The text appearing on the button face.
Tooltip
A tooltip that appears in most browsers if the user hovers the mouse over the button and waits. Leave blank for no tooltip.
Initial visibility
Whether or not the button is shown on startup. If Invisible, the button must be shown with the Set visible action.
Enabled
Whether the button is initially enabled. If No, the button will be greyed out and cannot be pushed.
ID (optional)
An optional id attribute for the element in the DOM (Document Object Model). This can be useful for accessing the element's value from external scripts, or styling with CSS in the HTML page.
Button conditions
On clicked
Triggered when the user pushes the button, either by keyboard, mouse or touch input.
Button actions
Set CSS style
Set a CSS (Cascading Style Sheets) style on the Button element. For more information, see the section Styling Button objects.
Set enabled
Set the button enabled or disabled. When disabled, the button appears greyed out and cannot be pushed.
Set focused
Set the input focus to the button.
Set text
Set the text on the button face.
Set tooltip
Set the text that appears for the button tooltip. Leave blank for no tooltip.
Button expressions
The Button object does not have any of its own expressions.