How to set pageLength on jquery datatable depending on specific column?

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How to set pageLength on jquery datatable depending on specific column?



I have a table like this enter image description here



But I'm trying to set de pageLength parameter depending on the first column to get something like this enter image description here



My datatable paramerters so far are:


var table = $('#table-comp').DataTable(
language:spanish,
columns: [

name: 'competencia',
title: 'Nombre de Competencia',
,


title: 'Grado Indicador',
,

title: 'Sel',

],
data: datos,
lengthChange: false,
searching: false,
pageLength: 6 //<--- Here is my problem. Not always is 6 fixed.
paging: true,
order: ,
rowsGroup: [
'competencia:name'
],
)
table.draw(false);



Help me please!









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