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DhtmlTree Grid How can i add new row into a Tree Grid while loading the JSP page, not using loadXML method. Can i add row to a Tree Grid using addRow() method when loading a JSP page

Of course row can be added by addRow command
In case of treeGrid it has two additional params

    grid.addRow(id,[data],index,parent_id,image);

parent_id - id of parent element ( 0 for top level ) , mandatory
image - path to image used for row, optional
the index can be set to null

To simplify row adding two more methods exists
    grid.addRowAfter(...
    grid.addRowBefore(...

Please beware that adding row by command is slower that adding rows by loadXML or loadXMLString in case of mass row adding.