History

(history)

Overview

The History object provides tools to manage a history stack, enabling navigation and manipulation of forms in the stack. It includes properties and methods to configure settings, navigate through history, and modify its content. ## Functionality

The primary property, buttonsEnabled, allows enabling or disabling history buttons, enhancing user interface control. It is a Boolean value that can be set or retrieved.

The object offers several methods for history stack management:

• Navigation methods like back(), forward(), and go(i) allow users to move through or jump to specific points in the history.

• Management methods such as clear() to reset the stack, removeForm(formName) and removeIndex(index) to delete specific entries, and size() to retrieve the stack's total size.

• Utility methods like getCurrentIndex() and getFormName(i) provide insights into the stack's state or retrieve specific form names based on their position.

These features ensure efficient and dynamic control over form navigation and history management.

Properties Summarized

Type	Name	Summary
Boolean	buttonsEnabled	Set/Get the history buttons enabled.

Methods Summarized

Type	Name	Summary
void	back()	Navigates back in the history stack; shows the previous form (if present).
void	clear()	Clear the entire history stack.
void	forward()	Navigates forward in the history stack; shows the next form (if present).
Number	getCurrentIndex()	Get the current absolute index in the history stack.
String	getFormName(i)	Get the form name based on the specified absolute index in the history stack location.
void	go(i)	Navigates to the relative index based on current position in the history.
Boolean	removeForm(formName)	Removes the named form item from the history stack (and from memory) if not currently shown.
Boolean	removeIndex(index)	Removes an absolute index based history stack form item.
Number	size()	Returns the total size of the history stack.

Properties Detailed

buttonsEnabled

Set/Get the history buttons enabled.

Type Boolean

Sample

history.buttonsEnabled = true;
var status = history.buttonsEnabled;

Methods Detailed

back()

Navigates back in the history stack; shows the previous form (if present).

Returns: void

Sample

history.back();

clear()

Clear the entire history stack.

Returns: void

Sample

history.clear();

forward()

Navigates forward in the history stack; shows the next form (if present).

Returns: void

Sample

history.forward();

getCurrentIndex()

Get the current absolute index in the history stack.

Returns: Number the current absolute index

Sample

var abs_index = history.getCurrentIndex();

getFormName(i)

Get the form name based on the specified absolute index in the history stack location.

Parameters

• Number i the absolute index

Returns: String the formName

Sample

var name = history.getFormName(history.getCurrentIndex());

go(i)

Navigates to the relative index based on current position in the history.

Parameters

• Number i the relative index

Returns: void

Sample

history.go(-3);

removeForm(formName)

Removes the named form item from the history stack (and from memory) if not currently shown. Will return false when the form can't be removed, this can happen in certain situations: 1> The form is visible, 2> The form is executing a function (is actively used), 3> There are references to this form by a global variable/array, 4> If the form has a separate foundset with edited records that can't be saved (for example autosave is false)

Parameters

• String formName the name of the form to remove.

Returns: Boolean true if successful

Sample

var done = history.removeForm('mypreviousform');

removeIndex(index)

Removes an absolute index based history stack form item.

Parameters

• Number index the index of the form to remove.

Returns: Boolean true if successful

Sample

var done = history.removeIndex(history.getCurrentIndex()+1);

size()

Returns the total size of the history stack.

Returns: Number the size

Sample

var size = history.size();

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