Programming the memory Table controls

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Table control

Memory table

Programming the memory Table controls

Overview

Initializing a memory Table control

Adding rows into a memory Table control

Managing calculated columns

Modifying a row or a column

Operations on the rows and cells

See also

Programming the memory Table controls

Overview

The main concepts for programming the memory Table controls are as follows.

Several WLanguage functions allow you to manage this type of control by programming. Do not hesitate to see the documentation about these functions.

See Functions for managing Table controls for more details.

Versions 20 and later

The Table control is now available for Android applications.

The Table control is now available for iPhone/iPad applications.

New in version 20

The Table control is now available for Android applications.

The Table control is now available for iPhone/iPad applications.

The Table control is now available for Android applications.

The Table control is now available for iPhone/iPad applications.

Initializing a memory Table control

The creation of a row in a Table control is not automatically performed. It must be explicitly requested via a call to:

TableAdd or TableAddLine: adds a row at the end of the Table control.
TableInsert or TableInsertLine: adds a row at the specified subscript or at the current subscript.

Remark: if "Cascading input (Addition)" is not selected:

A Table control contains no row when it is created:
TABLE_MyTable..Count=0.
In this case, no input is allowed and ..Empty is set to True.
To automatically insert a row if the Table control is empty, the following command lines must be used in the event "Initializing" of the Table control:

IF TABLE_MyTable..Empty = True THEN TableAdd(TABLE_MyTable)

Adding rows into a memory Table control

Adding rows into a memory Table control is performed:

by TableAddLine and TableInsertLine: in each row, the value of each column is separated by commas.
by TableAdd and TableInsert: in a row, each column value is separated by TAB.

If a new row was added into the Table control by TableAdd, TableInsert, TableAddLine or TableInsertLine, ..NewLine is set to True (otherwise, it is set to False).

Managing calculated columns

The calculation formula of a calculated column must be described in the event "Displaying a table row" of a Table control. For example:

// COL_PBT: calculated column
// COL_UPBT and COL_QTY: columns linked to memory zones
COL_PBT = COL_UPBT * COL_QTY

Modifying a row or a column

The content of a Table control's rows or columns can be modified:

by the user, by performing an input in the columns. The modifications are automatically stored in the Table control with no additional programming. ..Modified is set to True.
by programming:
- with TableModify to modify the content of the current row or the content of a given row.
  For example:
  
  TableModify(TABLE_CUSTOMER, "MOORE" + TAB + "Vince" + TAB + "Miami")
  
  Remark: you can also use the name of the Table control directly:
  
  // Modify the current row
  TABLE_CUSTOMER = "MOORE" + TAB +"Vince" + TAB + "Miami"
  // Modify row 3
  TableModify(TABLE_DAY, "Wednesday" + TAB + "Off", 3)
- by specifying the column name (like for an edit control) to modify the column content. To modify a column of a specific row, the row number must be specified (subscript).
  For example:
  
  COL_NAME[Subscript] = EDT_CustomerName
  
  To modify a column of the current row, there is no need to specify the subscript. For example:
  
  COL_NAME = EDT_CustomerName
  
  ..Modified is set to False (it is set to True when an input is performed in the Table control).

Forcing the input

ReturnToCapture can be used to force the input in a column of the current row.

For example:

// Entry process in the COL_QTY column
// COL_QTY cannot be entered,
// if COL_PRODUCT is not entered
IF NoSpace(COL_PRODUCT) = "" THEN
Error("The Product column must be entered first")
ReturnToCapture(COL_PRODUCT)
END

Adding or deleting a column

You can:

Add a column into a memory Table control with ControlClone.
Delete a column from a memory Table control with ControlDelete.

Operations on the rows and cells

Deleting a row

The deletion of a row must be explicitly requested by TableDelete. The following syntax is used:

TableDelete(<Table control>[, <Subscript>])

If the subscript is specified, TableDelete deletes the image that corresponds to the subscript. Otherwise, the current row is deleted. For example:

TableDelete(TABLE_CUSTOMER)

The deletion of a Table control row also deletes all the values of the columns for this row.

A row can be selected with TableSelectPlus.

The following syntax is used:

TableSelectPlus(<Table control>[, <Subscript>])

Retrieving the row content or the cell content

The content of a memory Table control can be retrieved:

for the entire row.
cell by cell.

Value of a cell in the current row

To retrieve the value of a column (or cell) for the current row, the syntax is the same as for a simple edit control.

Example:

// COL_QTY is a column of the Table control
IF COL_QTY < 10 THEN
Info("Insufficient quantity")
END

Value of a cell in a specific row

To retrieve the value of a column not found on the current row, the row subscript must be specified.

<Value> = <Column name>[<Subscript>]

For example:

// Add the total price before tax (PBT) for all the order lines
TotalPrice = 0
FOR Subscript = 1 _TO_ TABLE_ORDERS..Occurrence
TotalPrice = TotalPrice + COL_PBT[Subscript]
END

Content of current row

To retrieve the content of the current row, use the following syntax:

Content of specific row

To retrieve the content of the row whose subscript is <Subscript>, use the following syntax:

<Value> = <Table control>[<Subscript>]

Remark: The subscript of the current row is returned by TableSelect.
For example:

// Retrieve row #10 in the TABLE_CUSTOMER control
CurrentRow = TABLE_CUSTOMER[10]

// Name of selected customer
CustomerName = COL_NAME[TableSelect(TABLE_CUSTOMER)]

// Retrieve the current row in the TABLE_CUSTOMER control
CurrentRow = TABLE_CUSTOMER