onBeforePaste

fires before data pasting

boolean onBeforePaste(object start,object end,array data,boolean fromSheet,object context);

start	object	an object with the start cell of the selected area (target of paste) set as {row:id, column:id}
end	object	an object with the end cell of the selected area (target of paste) set as {row:id, column:id}
data	array	an array of cells with data that were copied (a 2D (two-dimensional) array of rows with cells)
fromSheet	boolean	signals if the copied data are from the same sheet where they are pasted into
context	object	a context object of the copy operation which has page (the origin of the copied data) and view (the instance of spreadsheet, also the origin of the data)

boolean

returning false will prevent pasting of copied data

$$("ssheet1").attachEvent("onBeforePaste",function(start,end,data,fromSheet,context){
    // handler code here
    return true;
});

Details

Each cell in the data array parameter includes:

text - a string returned by getCellValue()
math - a string with the formula or null
style - an object with the style of the cell
extra - optional, contains: row, col, condition, dropdown, filter, span, validation - all optional