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

setMaxOpen

defines the maximal number of listed options shown for a select button

void setMaxOpen(string|number itemId,number max);

Parameters

itemIdstring|numberthe id of a select button
maxnumbera max number of listed options

Example

myToolbar.setMaxOpen(itemId, max);

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