From what i understand you want are creating multiple text fields and splitting one value in all of them so the same as your no….
And when one will alter any text field that new value should be divided into all of them and sum of all text areas should be that entered value, am I correct??
Please share your code for split_advance so that we can help…
and it should be called onblur so that you are doing correctly..no need of ajax or anything
just need to modify your split advance function