Selectiing All in size per page

[totalcloud-tc]

Question
I have a size per page Option 'All' whose value is equal to data size, I have some external filter which changes the data. So the case is, if I select All in sizePerPage Option then it will set it to the current dataSize (say 69). if I now change the external filter the dataSize will also change (say now the data size is 45). But currently, the size per page is 69 as we didn't update it by calling onSizePerPageChange because now the all value is changed. So my question is where should I call onSizePerPageChange function only when previously All is selected/