Question

i have a table

Fields
class 1
class 2
class 3
class 4

a1      
10       
240      
340     
 401

a2      
12       
270      
340      
405      

a3      
12       
270      
340      
405      

a4      
15       
270      
360      
405      

a5      
17       
720      
530      
450      

i have this in grid as well as in Json.store , what i have to do is perform mathematical calculation each time the grid is refreshed by “table name”.reconfigure(….. , ….)

consider the column “class1” ,
value(a5) = ( value(a1)+ 2*value(a2) + 3*value(a3) ) /value(a4)
can anybody please help he on this problem ,

I will be very very Thankful for help 🙂

Answer 1

As I’m not sure what aspect of the problem you are having difficulty with, I’ll address both at a high level.
Generally speaking you want to have your reconfigure method update the Ext Store, which will then trigger an event that the Grid should handle. Basically, change the Store and your Grid will be updated automatically.

As far as generating the correct new row… it seems fairly straightforward – a rough pass:

/*for each field foo_X through foo_N:*/
var lastElementIndex = store.data.size-1; 
var total = 0;
for (var i=0; i<; i++) {
    if (i != lastElementIndex) {
        total += store.data[i].get(foo_X)*i;
    } else {
        total = total/store.data[i].get(foo_x);
    }

}
/*construct your json object with the field foo*/
/*after looping through all your fields, create your record and add it to the Store*/