javascript - Finding value of each member of a column in grid (JS) -


i having bit of issue , hoping can help. beginner @ js might have simple answer going on head.

i have grid can dynamically created based on user specified rows , columns. have array of row numbers , array of col numbers , attributed id each member using formula:

index = (maxcols * rownumber) + col;

i have added id each member of grid, resulting this:

1   2   3 4   5   6  7   8   9

basically trying find value of every member of column , add own array. in case answer might 

column1 [1,4,7]; column2 [2,5,8]; column3 [3,6,9];

the result im going allow me find relative column having member id. push in right direction fantastic. in advance!

if understand correctly, can this: 

var maxcol = 4,     maxline = 4,     col = 2,     line = 3;  var index = (maxcol * line) + col;  var foundcol = index % maxcol; // found column var foundline = (index - col) / maxline; // found line  console.log(index, foundcol, foundline);

then loop through indexes , add columnsvalues[foundcol] value.

does ?


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