Assistance Class Use in WebDynpro ABAP

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Assistance Class Use in WebDynpro ABAP

Prepared by:

Pallavi Gupta (Emp. Code – 00662K)

Email ID –[email protected]

January 28, 2012


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Contents

Use of Assistance Class:..............................................................................................

Advantages of Assistance Class:...................................................................................

Overview...................................................................................................................

Creation of DDIC Objects............................................................................................Creation of Assistance Class........................................................................................

Add Inheritance.........................................................................................................

Create Methods in the Class.........................................................................................

Create Text Eleents..................................................................................................

Create !ebD"n#ro Co#onent....................................................................................

Object for the Class....................................................................................................

Code.........................................................................................................................

Test..........................................................................................................................Create A##lication...................................................................................................

$eference%s&..............................................................................................................


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Use of Assistance Class:

A #iece of code which is getting 'sed again and again in a co#onent can be added

to the ethod of an assistance class. (ow this ethod can be called ever" tie that

#artic'lar code has to be exec'ted.

Advantaes of Assistance Class:• Calling a ethod of an assistance class gives 'ch i#roved #erforance

than calling a ethod of a controller.• Use of d"naic texts. Text can be saved as text s"bols in an assistance

class and can be 'sed at r'n tie.

!ve"vie#

In this Doc'ent) I*ll dis#la" the sales doc'ent details. The 'ser will have to enter

the creation date+ all the doc'ents with that creation date will be dis#la"ed. !hen

'ser selects an" #artic'lar sales doc'ent) the line ites of that #artic'lar sales

doc'ent will be dis#la"ed

Steps:

C"eation of $$%C !&'ects

Create , str'ct'res as show below in -E.


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(ow create , Table T"#es 'sing the str'ct'res created above.

-ave and activate.

C"eation of Assistance Class

/o to transaction -E,0 to create a new assistance class.


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Clic1 on create.

/ive the nae of the class.

Add %ne"itance

(ote: All the assistance classes inherit fro C23!D3COM4O(E(T3A--I-TA(CE.

To add the nae of the s'#erclass) clic1 on the b'tton next to class nae field) a

new field for s'#erclass will a##ear. Add the nae of the s'#erclass.


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Clic1 on -ave.

The following screen will a##ear.

Two ethods get a'toaticall" created. These are inherited fro the s'#erclass.

I53!D3COM4O(E(T3A--I-TA(CE6/ET3TE7T ethod is 'sed to get the d"naic

texts.


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C"eate etods in te Class

In the Methods tab) create , ethods:

& /ET3-A2E-3DOCUME(T-,& /ET3-A2E-3DOCUME(T3DETAI2-

-elect the 8/ET3-A2E-3DOCUME(T-* ethod and clic1 on #araeters b'tton.

Add , #araeters as shown below.

C"eation of Assistance Class

/o to transaction -E,0 to create a new assistance class.

Clic1 on create.

/ive the nae of the class.


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Add %ne"itance

(ote: All the assistance classes inherit fro C23!D3COM4O(E(T3A--I-TA(CE.

To add the nae of the s'#erclass) clic1 on the b'tton next to class nae field) a

new field for s'#erclass will a##ear. Add the nae of the s'#erclass.

Clic1 on -ave.


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The following screen will a##ear.

Two ethods get a'toaticall" created. These are inherited fro the s'#erclass.

I53!D3COM4O(E(T3A--I-TA(CE6/ET3TE7T ethod is 'sed to get the d"naic

texts.

C"eate etods in te Class

In the Methods tab) create , ethods:

9& /ET3-A2E-3DOCUME(T-0& /ET3-A2E-3DOCUME(T3DETAI2-

-elect the 8/ET3-A2E-3DOCUME(T-* ethod and clic1 on #araeters b'tton.

Add , #araeters as shown below.


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-iilarl") add #araeters for /ET3-A2E-3DOCUME(T3DETAI2-* ethod.

(ow) do'ble clic1 on the 8/ET3-A2E-3DOCUME(T-* ethod nae. In the editor

screen) enter the following code.

select ;E2( E$DAT E$ i3erdat.

-iilarl") add the following code in the 8/ET3-A2E-3DOCUME(T3DEATAI2-* ethod.


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select ;E2( 4O-($ MAT($ MAT!A A$=T7 4-T? MEI(- fro ;A4 into table e3vba# where ;E2( e> i3vbeln.

C"eate *e+t Elements

Assistance class allows 's to 'se the d"naic texts. In order to create the) clic1 on

/OTO TE7T E2EME(T-.

Add text eleents. -ave and activate.


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The assistance is read" to be 'sed. !e can test the wor1ing of o'r class b" clic1ingthe exec'te b'tton.

C"eate ,e&$-np"o Component

/o to -E@ and create a new webd"n#ro co#onent.

Do'ble clic1 on the co#onent nae. In the Assistance class field) add the nae of

the class.


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/o to the ain view and go to the context tab.

Create the following nodes and attrib'tes:

Clic1 on Add Attrib'te fro -tr'ct're b'tton.


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Clic1 on Add Attrib'te fro -tr'ct're b'tton.


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Create an attrib'te of DAT- t"#e.

Create , string attrib'tes: TE7T and TE7T,. These will be 'sed to dis#la" thed"naic texts. 5inall" the nodes and attrib'tes wo'ld loo1 this:


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/o to the la"o't tab and insert the UI eleents.

Insert , Table UI eleents. One to dis#la" the header lines of the sales doc'entsand other to dis#la" the line ites of the selected sales doc'ent.

$ight clic1 on the table UI eleent) clic1 on create binding.


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Clic1 on Context b'tton.

-elect the ;A= node.


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-iilarl" create another table UI eleent and do the binding.


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5or the second table) select ;A4 node.

Create a b'tton UI eleent) and create an onAction event hander with the naeO(-EA$CB.


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Create an On2ead-elect event handler for the first table. This event handler will becalled ever" tie when a row in the first table is selected.

;ind the Ca#tion of both the tables with attrib'te TE7T and TE7T, res#ectivel".


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The final UI eleent will loo1 li1e this:


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!&'ect fo" te Class

/o to the Attrib'tes tab of the view) an object for the assistance class !D3A--I-T will be a'toaticall" created.

Code

/o the !DDOI(IT ethod of the view and 'se the following code:

The following code calls the I53!D3COM4O(E(T3A--I-TA(CE6/ET3TE7T ethodof the assistance class. This ethod ta1es the essage n'ber as in#'t andret'rns the text eleent corres#onding to it. These texts are then set to TE7Tand TE7T, attrib'te and will a##ear on the ca#tion of the table.

ethod !DDOI(IT .

data: header t"#e string) header, t"#e string) Ele3Context t"#e ref to If3!d3Context3Eleent)

-tr'3Context t"#e If3Main3iewFEleent3Context) Ite3TE7T li1e -tr'3ContextGTE7T.

* get element via lead selection

Ele3Context wd3ContextGFget3Eleent% &.

header !D3A--I-TGFI53!D3COM4O(E(T3A--I-TA(CE6/ET3TE7T% =E? HH &. header, !D3A--I-TGFI53!D3COM4O(E(T3A--I-TA(CE6/ET3TE7T% =E? H,H &.

* set single attribute

Ele3ContextGFset3Attrib'te%

ex#orting (ae TE7T al'e header &.

* set single attribute

Ele3ContextGFset3Attrib'te% ex#orting (ae TE7T, al'e header, &.


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endethod.

(ow go to O(ACTIO(O(-EA$CB ethod and 'se the following code:

The following code gets the creation date entered b" the 'ser on the selection andthen calls the /ET3-A2E-3DOCUME(T- ethod of the assistance class withcreation date as in#'t #araeters and ret'rns an internal table.

ethod O(ACTIO(O(-EA$CB .

* Read the user entered date

data: Ele3Context t"#e ref to If3!d3Context3Eleent) -tr'3Context t"#e If3Main3iewFEleent3Context ) Ite3C$EATIO(3DATE li1e -tr'3ContextGC$EATIO(3DATE) (ode3ba1 t"#e ref to If3!d3Context3(ode)

Ele3ba1 t"#e ref to If3!d3Context3Eleent) -tr'3ba1 t"#e If3Main3iewFEleent3ba1 ) it3vba1 t"#e Jvba13tt.* get element via lead selection Ele3Context wd3ContextGFget3Eleent% &.

* navigate from to via lead selection

(ode3ba1 wd3ContextGFget3Child3(ode% (ae I53MAI(3IE!Fwdctx3ba1 &.

* get element via lead selection

Ele3ba1 (ode3ba1GFget3Eleent% &.

* get single attribute Ele3ContextGFget3Attrib'te% ex#orting (ae C$EATIO(3DATE i#orting al'e Ite3Creation3Date &.

CA22 METBOD !D3A--I-TGF/ET3-A2E-3DOCUME(T- E74O$TI(/ I3E$DAT Ite3Creation3Date IM4O$TI(/ E3;A= it3vba1.

I5 not it3vba1KL I- initial.

(ode3ba1GFbind3table% it3vba1 &.

E(DI5.

endethod.


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The ethod of the class can called 'sing 4attern b'tton.

/ive the instance nae %object nae& of the class) which is !D3A--I-T in o'rcase. 4rovide the class nae and ethod to be called. Code will be generated b"the s"ste.

Use the following code on the On2ead-elect ethod of the first table.

The following code will get the selected sales doc'ent n'ber %;E2(& and will#ass it to the /ET3-A2E-3DOCUME(T3DETAI2- ethod of the class to get the lineites corres#onding to that sales doc'ent n'ber.

ethod O(ACTIO(O(-E2ECT .

data:

(ode3ba1 t"#e ref to If3!d3Context3(ode) Ele3ba1 t"#e ref to If3!d3Context3Eleent) -tr'3ba1 t"#e If3Main3iewFEleent3ba1 ) (ode3ba# t"#e ref to If3!d3Context3(ode) Ele3ba# t"#e ref to If3!d3Context3Eleent) -tr'3ba# t"#e If3Main3iewFEleent3ba# ) it3vba# t"#e Jvba#3tt.* navigate from to via lead selection (ode3ba1 wd3ContextGFget3Child3(ode% (ae I53MAI(3IE!Fwdctx3


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ba1 &.

* get element via lead selection Ele3ba1 (ode3ba1GFget3Eleent% &.

* navigate from to


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Initial -creen

Enter thecreation


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date and clic1 on -earch b'tton. -ales doc'ents created on that date getsdis#la"ed.

-elect an" sales doc'ent) line ites corres#onding to that sales doc'ent getsdis#la"ed.


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efe"ence(s)

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Assistance Class Use in WebDynpro ABAP