Question

For example I have grid.

//grid for answers_for_online
var answersGridForOnline5 = new Ext.grid.GridPanel({
    id          : 'grid_for_stats',
    store       : storez3,
    columns     : answers_columns5,
});

my column:

var answers_columns5 = [{
    id: "idz",
    header: 'idz',
    dataIndex: "idz",
    renderer: fun_f
}];

and renderer function

function fun(n, j, k, m, h, i) {
    var count = store.snapshot ? store.snapshot.length : store.getCount()

    var cez = k.get("scale")
    var ce =  ( 2 / count ) * 100

    return ce + " % "
}

Question: In database I have for example: scales (that user answered on scale-question)

id | scale
1  |  4
2  |  4
3  |  1
4  |  2

How i can sum scales (and group them of course) and put this in my grid?
For example in my grid i should get:

scale | scale %
1     |  25%
2     |  25%
4     |  50%

Answer 1

I advise you don’t attempt to do it inside Grid/Store. Instead process the data before loading it to store – for example do it in database with GROUP BY statement.