SpreadSheet allows performing operations with simple cell content (numbers, strings) and operators (arithmetic, comparison, etc.) as well as with built-in functions and custom functions. It is also possible to combine regular operands and functions in more complex formulas. The component processes them and displays the result in the related cells.

The syntax of a formula is the same as in Excel.

- Formula must start from the '=' sign.
- The names of functions and cell references must be written in capital letters.
- The following elements can be used within formulas:

- basic mathematical operators, which are: +, -, /, *
- comparison operators: <, >, <=, >=, <>, =
- the
*&*operator for string concatenation - numbers
- cell references
- Excel-like functions

"data": [
[ 3, 2, "=A1+B2",""],
[ 4, 2, "=7+8",""],
[ 5, 2, "=7+B2",""],
[ 6, 2, "=SUM(A3+D7)",""]
...
]

4 . There are two variants of recording a formula, depending on which you can get different results:

- if you want to apply a formula only to two certain cells, you need to specify comma-separated references to these cells, e.g.:

"data": [
[ 7, 2, "=SUM(A3,D7)",""]
]

- if you want to calculate the values of cells in a range, you should define colon-separated references to the first and the last cells of the range, e.g,:

"data": [
[ 7, 2, "=SUM(A3:D7)",""]
]

You can contatenate string content of cells. There are three possible ways for this:

1 . use two text strings or references to the necessary cells and the **&** operator as: "=nice"&"trip" or =A1&B2

2 . use two text strings or references to the necessary cells and the **+** operator as: ="nice"+"trip" or =A1+B2.
The "+" operator will sum numeric values and concatenate the values if summing is not possible (e.g. ="nice"+12).

3 . apply the CONCATENATE() function, like this: =CONCATENATE("nice","trip" or A1,B2). It's also possible to connect strings from a range of cells to produce one continuous text: =CONCATENATE(C2:D4)

You can specify a name for a particular range of cells and then use it in formulas for calculations.

Thus, the formula will be easier to understand and work with.

You can add a named range and manipulate it through the **ranges** collection:

to add a new named range, use the

*ranges.add()*method and pass two parameters to it:- name - (string) the name for a named range
- range - (string) the range of cells to include into the range

$$("ssheet").ranges.add("MYRANGE","B2:C2");

- to get the range of cells included into the named range, use the
*ranges.getCode()*notation:

var code = $$("ssheet").ranges.getCode("MYRANGE"); // -> "B2:C2"

- to get values of all cells included into the named range, make use of the
*ranges.getData()*method. The method returns an array with data values of cells:

var data = $$("ssheet").ranges.getData("MYRANGE"); // -> ["100", "200", "300"]

- to get all the existing named ranges, apply the
*ranges.getRanges()*method. The method returns an array with objects, each of which presents a named range:

var ranges = $$("ssheet").ranges.getRanges(); // -> [{name:"K",range:"C3:D3"},...]

- to remove an existing named range, use the
*ranges.remove()*method:

$$("ssheet").ranges.remove("MYRANGE");

You have a possibility to link data of several sheets and use these cross references in formulas to process them together.

The rules of creating a reference to an external sheet are quite simple:

*Sheet_Name!Cell_Name*- to refer to a cell of other sheet, e.g. =Countries!A4*Sheet_Name!Cells_Range*- to refer to a range of cells from other sheet, e.g. =SUM(Countries!B2:B3)*Sheet_Name!Named_Range*- to refer to a named range from other sheet, e.g. =SUM(Countries!DATA)

Here are some use cases that demonstrate how you can use cross references in multi sheets:

- provide reference to a cell from a different sheet, e.g. =Data!B8*D13 (where B8 is a cell from the "Data" sheet)
- fill a chart with data from a different sheet, e.g. =SPARKLINE(Countries!DATA,"splineArea","#6666FF") (where "DATA" is a named range from the "Countries" sheet)
- fill a dropdown with a data range from a different sheet, e.g. by referecning the range in the "Add dropdown" dialog as: Countries!NAMES (where "NAMES" is a named range from the "Countries" sheet)

Related sample: Spreadsheet: Multiple Sheets

Spreadsheet possesses an advanced formula editor. Its main features are:

- providing the list of possible functions on entering the first letter of the function name in the input;
- entering formula operands either by selecting a range of cells or by typing in the cell reference.

It's easy to enable the formula editor, just set the liveEditor property to true in the spreadsheet configuration:

webix.ui({
view: "spreadsheet",
data: base_data,
liveEditor: true
});

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