JavaScript » Objects » Button
A Button object is created with every instance of an HTML <INPUT> tag (with a 'type' value set as 'button') on a form. These objects are then stored in the elements array of the parent form and accessed using either the name defined within the HTML tag or an integer (with '0' being the first element defined, in source order, in the specified form).
Properties
- constructor
Syntax: Object.constructor
This specifies a function to create an object's property and is inherited by all objects from their prototype.
- form
Syntax: button.form
This property returns a reference to the button's parent form.
- name
Syntax: button.name
This property sets or returns the value of the button's name attribute.
- prototype
Syntax: Object.prototype.name = value
This allows the addition of properties and methods to any object.
- type
Syntax: button.type
Every element on a form has an associated type property. In the case of a Button object, the value of this property is always "button".
- value
Syntax: button.value
This property sets or returns the button's value attribute. This is the text that is actually displayed on the button face.
Methods
- blur
Syntax: button.blur( )
This method removes the focus from the specified Button object.
- click
Syntax: button.click( )
This method simulates a mouse-click on the button.
- eval
Syntax: Object.eval(string)
The eval method is deprecated as a method of Object, but is still used as a high level function. It evaluates a string of JavaScript in the context of an object.
- focus
Syntax: button.focus( )
This method gives focus to the specified Button object.
- handleEvent
Syntax: button.handleEvent(event)
This method calls the handler for the specified event.
- toSource
Syntax: Object.toSource()
The toSource method returns a literal representing the source code of an object. This can then be used to create a new object.
- toString
Syntax: Object.toString()
The toString method returns a string representing a specified object.
- unwatch
Syntax: Object.unwatch(property)
This method removes a watchpoint set for an object and property name with the watch method.
- valueOf
Syntax: Object.valueOf()
This method returns a primitive value for a specified object.
- watch
Syntax: Object.watch(property, handlerfunction)
This method adds a watchpoint to a property of the object.
See Also:
