Select next row in TableView by javascript

[updaterr]

How to change currentrow in TableView by javascript ?

function goToNextItem()
{
var currentindexnumber = mainTable.currentRow;
var nextindexnumber = currentindexnumber+1;
mainTable.selection.clear();
mainTable.selection.select(nextindexnumber);
console.log(mainTable.currentRow); // this report a current row, but value is not changed
}

function goToNextItem()
{
var currentindexnumber = mainTable.currentRow;
var nextindexnumber = currentindexnumber+1;
mainTable.selection.clear();
mainTable.selection.select(nextindexnumber);
console.log(mainTable.currentRow); // this report a current row, but value is not changed
}

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Why this code doesn't work ?

[updaterr]

I resolve this: mainTable.currentRow=nextindexnumber;