You can set the height of a splitter bar and a splitter pane through client side code using the below code snippet:
function ChangeSplitterHeight( nDelta )
var nOldHeight = _sfSplitter1.GetHeight();
var nNewHeight = nOldHeight + nDelta;
if( nNewHeight > 0 )
_sfSplitter1.SetHeight( nNewHeight );
Please refer the sample in the below link which illustrates the above:"
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