SAP screen designer topic: drop-down list box (4)

Since it is a screen designer, there must naturally be a drop-down list box. Here we will do it.

First, SE38 creates a program. SE51 pulls a text box control and sets the property of the drop-down box to Listbox with the name "VALUE:

Drag a text box and set it to read-only, as shown below:

The screen design page is as follows:

The code for the screen design attribute is as follows:

Process on value-REQUEST. defines the event triggered by calling F4 help or clicking this field.

Field value module setvalue. assign values to the drop-down list box.

In SE38, remember to enter the following code as the Key at the beginning of the program:

TYPE-POOLS: VRM. This is used to reference the drop-down list box.

Next, declare the variable, which corresponds to the control name.
DATA: VALUE (10) type c, "drop-down list
DESC (10) type c. "Description

START-OF-SELECTION.
Call screen 100. "load SCREEN

Load the MODULE in the drop-down list box:

Module setvalue input.

DATA: LV_NAME TYPE VRM_ID,

LT_LIST TYPE VRM_VALUES,

LW_VALUE like line of LT_LIST.

CLEAR: LT_LIST, LW_VALUE.

LV_NAME = 'value '.

"Read data table content to internal table
Select value into LW_VALUE-KEY FROM ZCODE_MSTR where fidname = 'LIST '.

LW_VALUE-TEXT = LW_VALUE-KEY.

APPEND LW_VALUE TO LT_LIST.

ENDSELECT.

Call function 'vrm _ SET_VALUES '"call function filling content

EXPORTING

ID = LV_NAME

VALUES = LT_LIST.

ENDMODULE. "SETVALUE INPUT

"Read the corresponding description based on the value of the drop-down box
Form getdesc.

Select cmt into desc from ZCODE_MSTR where fidname = 'LIST' and value = VALUE.

ENDSELECT.

ENDFORM. "GETDESC

"User operation code
MODULE USER_COMMAND_0100 INPUT.

CASE SY-UCOMM.

WHEN 'back' OR 'exit 'OR 'cancel '.

Leave program.

WHEN 'save'. "display the value of the drop-down box

Message value type 'I '.

WHEN 'thelist' OR 'enter'. "action after the drop-down list box Content Changes

Perform getdesc.

ENDCASE.

ENDMODULE. "USER_COMMAND_0100 INPUT

The ZCODE_MSTR content is as follows:

Finally, the program running result is as follows:

The program achieves good interaction. After the content in the drop-down list box is changed, the corresponding content is automatically displayed.