Check documentation for the latest version 6.0 of dhtmlxSuite collapseColumns DHTMLX Docs

collapseColumns

collapses a group of columns

void collapseColumns(number cInd);

Parameters

cIndnumberindex of the first column in the group

Available only in PRO Edition

Example

//collapse the group of columns
myGrid.collapseColumns(3); //can be called after the init only

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