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The user can control the overall look of the grid to a certain extent by using layout variants. In other words, ALV can also be defined as a set of APIs (classes or function modules) application programming interfaces to display data in a hierarchical or tabular format and embedded options for processing of event and visual presentation. Find SAP ABAP Developers or hire ABAP List Viewers experts and get your project done at Paperub.com.

Formerly ALV was known as ABAP List Viewer but currently, the term SAP List Viewer is found in SAP documentation. ALV offers a user-friendly interface with a toolbar that permits every user to adjust the layout as per their preferences and filter data easily. Various standard SAP reports utilize ALV and it has become an accepted tool for building custom ABAP reports as it is flexible, easy to implement, and offers various features.

Functions of ABAP List Viewer (ALV)

ALV offers a wide range of in-built functions to the report and some of the important functions are listed below:

• Sorting of records
• Filtration of records
• Totals and Sub-totals
• Downloading the output of the report to HTML or Excel
• Changing the column orders in the report
• Hide unwanted or unnecessary columns from the report

Due to the above-mentioned functions, ALV can reduce the development time of the report significantly. It takes care of displaying the list and we can focus mainly on the part of data retrieval.

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Functions of ALV Grid Control

Some of the major functions are depicted below:

• Displaying non-hierarchical lists continuously with a modern design
• Using specific list functions such as filtering and sorting without giving extra effort to programming
• Modify predefined functions of the list and their improvements
• Program responses to actions of the user individually ( like double-clicking a line)

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Ways of Listing Data in the ALV Grid

The two methods that are used to list data in the ALV grid are as follows:

• CALL METHOD: grid>set_table_for_first_display
• CALL FUNCTION REUSE_ALV_LIST_DISPLAY

CALL METHOD: grid>set_table_for_first_display

• set_table_for_first_display method can be used for passing the list data, the field catalog, and any other information to the ALV Grid Control.
• For passing the list data to be shown, parameter it_outtab can be used.
• You can pass the row structure name of the data table by using the i_structure_name parameter. Then field catalog is generated automatically by the proxy object. If a manually or semi-automatically generated field catalog is required to be passed then parameter it_fieldcatalog must be used.
• Parameters is_variant and i_save can be used to control the usage of display variants. By using the i_default parameter, you can control the loading of a default variant. This is the default setting of the parameter.
• Parameters such as is_print, is_layout, it_toolbar_excluding, and it_special_groups allow passing settings for the print list and control layout along with the names of the functions and names of the field groups are required to be impaired in the toolbar.
• It_filter and it_sort parameters can be used to pass the initial filter and criteria to be sorted to the proxy object.
• The name conventions are used by the interface parameters like i_= single field, it_= internal table is_ = structure.

CALL FUNCTION REUSE_ALV_LIST_DISPLAY

• Use of type group SLIS: creating field catalog and other important internal tables.
• Explanation of field description to ALV by using field catalog.
• Setting messages for header and including into GT_TOP_OF_PAGE
• Call function ‘reuse_ALV_list_display’ and passing of output internal table and field catalog.

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