Programming Table controls based on a data file

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Help / Developing an application or website / Controls, windows and pages / Controls: Available types / Table control / Table based on a data file

Overview
Selecting, adding and modifying a row in a Table control based on a data file
Deleting a row from a Table control based on a data file
Managing calculated columns
Retrieving the content of a row, column or cell
Important
Value of the cell in the current row
Value of a cell in a specific row
Content of the current row
Content of row X
Content of the selected rows for a multiple selection

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See also

Programming Table controls based on a data file

Overview

This page explains how to program Table controls based on a data file. There are multiple WLanguage functions to programmatically manipulate this type of Table controls.

To learn more on these functions, see the documentation. For more details, see: List of functions specific to Table controls.

Selecting, adding and modifying a row in a Table control based on a data file

A row can be selected with TableSelectPlus.

If no stored item is defined for the Table control, you can use the following syntax:

To add and modify rows in the Table control (or records in the data file), follow these two steps:

Add or modify the record in data the file (via a form window or page, for example).
Display the Table control again:
- refresh the Table control.
- refresh the page.

Deleting a row from a Table control based on a data file

To delete a row from the Table control based on a data file, use TableDelete. TableDelete deletes the corresponding record from the data file.

In WEBDEV, the page must be redisplayed.

Important: To delete a record in the data file, do not use the HDelete function, otherwise data in the data file will be lost.

Managing calculated columns

The calculation formula of a calculated column must be defined in the "Display a row" event of a Table control.

Example of code in the "Display a row" event of the Table control:

// COL_MsgAlerte: a calculated column 
// The COL_AlertMsg column displays "Alert" if COL_Stock<200
IF COL_Stock < 200 THEN
	COL_AlertMsg = "Alert"
ELSE
	COL_AlertMsg = ""
END

By definition, a Calculated control is not linked to a field: the value assigned by a line's display code is not memorized after scrolling through the lines of the Table field using the vertical scrollbar.

For example, a "FOR EACH LINE" statement cannot be used to assign or retrieve the value of a calculated column for all the rows of the Table control.

If the Table control uses an in-memory data source ("Loaded in memory" option checked in the "Content" tab of the control description window), the value in the calculated columns will not be lost at runtime.

Retrieving the content of a row, column or cell

Important

The content of a row in a Table control based on a data file can be retrieved:

by retrieving the entire row.
cell by cell.

Value of the cell in the current row

The cell is identified by the name of the column. The following syntax must be used:

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

The cell is identified by the name of the column. The following syntax must be used:

<Value> = <Column name>[<Row index>]

Example:

// Adds the price found in the COL_PBT column  
// for all the order lines displayed
TotalPrice = 0
FOR Index = 1 TO TABLE_ORDER.Count
	TotalPrice = TotalPrice + COL_PBT[Index]
END

Content of the current row

The following syntax must be used:

You also have the ability to use the following syntax:

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

Content of row X

The following syntax must be used:

<Value>=<Table control>[<Row index>]

Remark: The line index can be given by the TableSelect function..

// Retrieves the current row in TABLE_CUSTOMER
CurrentRow = TABLE_CUSTOMER

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

Content of the selected rows for a multiple selection

The following syntax must be used:

<Value>=<Table control>[<Row index>]

Remark: To find out the indices of the selected lines, use functions TableSelectCount and TableSelect..

// Traces the content of the selected rows
i is int
NbSelected is int = TableSelectCount(TABLE_Product) 
FOR i = 1 TO NbSelected 
	Trace("Selected line: " + ...
			TABLE_Product[TableSelect(TABLE_Product, i)]) 
END 

// Equivalent to:
// FOR EACH SELECTED ROW OF TABLE_Product
// Trace("Selected line: " + TABLE_Product[TableSelect(TABLE_Product, i)])
// END

Note: Table based on a data file fields are not available:

If the Table control contains proportional scrollbars.
If the Table control is "5.5 compatible".
In Table controls displayed by Combo Boxes.

Remark: The Multiselection property indicates the selection mode of a Table field.