291 lines
6.6 KiB
Markdown
291 lines
6.6 KiB
Markdown
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#### Formulae
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The A1-style formula string is stored in the `f` field. Even though different
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file formats store the formulae in different ways, the formats are translated.
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Even though some formats store formulae with a leading equal sign, CSF formulae
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do not start with `=`.
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<details>
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<summary><b>Formulae File Format Support</b> (click to show)</summary>
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| Storage Representation | Formats | Read | Write |
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|:-----------------------|:-------------------------|:-----:|:-----:|
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| A1-style strings | XLSX | ✔ | ✔ |
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| RC-style strings | XLML and plain text | ✔ | ✔ |
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| BIFF Parsed formulae | XLSB and all XLS formats | ✔ | |
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| OpenFormula formulae | ODS/FODS/UOS | ✔ | ✔ |
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| Lotus Parsed formulae | All Lotus WK_ formats | ✔ | |
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Since Excel prohibits named cells from colliding with names of A1 or RC style
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cell references, a (not-so-simple) regex conversion is possible. BIFF Parsed
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formulae and Lotus Parsed formulae have to be explicitly unwound. OpenFormula
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formulae can be converted with regular expressions.
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Shared formulae are decompressed and each cell has the formula corresponding to
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its cell. Writers generally do not attempt to generate shared formulae.
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</details>
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**Single-Cell Formulae**
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For simple formulae, the `f` key of the desired cell can be set to the actual
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formula text. This worksheet represents `A1=1`, `A2=2`, and `A3=A1+A2`:
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```js
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var worksheet = {
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"!ref": "A1:A3",
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A1: { t:'n', v:1 },
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A2: { t:'n', v:2 },
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A3: { t:'n', v:3, f:'A1+A2' }
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};
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```
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Utilities like `aoa_to_sheet` will accept cell objects in lieu of values:
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```js
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var worksheet = XLSX.utils.aoa_to_sheet([
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[ 1 ], // A1
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[ 2 ], // A2
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[ {t: "n", v: 3, f: "A1+A2"} ] // A3
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]);
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```
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Cells with formula entries but no value will be serialized in a way that Excel
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and other spreadsheet tools will recognize. This library will not automatically
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compute formula results! For example, the following worksheet will include the
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`BESSELJ` function but the result will not be available in JavaScript:
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```js
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var worksheet = XLSX.utils.aoa_to_sheet([
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[ 3.14159, 2 ], // Row "1"
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[ { t:'n', f:'BESSELJ(A1,B1)' } ] // Row "2" will be calculated on file open
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}
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```
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If the actual results are needed in JS, [SheetJS Pro](https://sheetjs.com/pro)
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offers a formula calculator component for evaluating expressions, updating
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values and dependent cells, and refreshing entire workbooks.
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**Array Formulae**
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_Assign an array formula_
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```js
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XLSX.utils.sheet_set_array_formula(worksheet, range, formula);
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```
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Array formulae are stored in the top-left cell of the array block. All cells
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of an array formula have a `F` field corresponding to the range. A single-cell
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formula can be distinguished from a plain formula by the presence of `F` field.
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For example, setting the cell `C1` to the array formula `{=SUM(A1:A3*B1:B3)}`:
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```js
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// API function
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XLSX.utils.sheet_set_array_formula(worksheet, "C1", "SUM(A1:A3*B1:B3)");
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// ... OR raw operations
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worksheet['C1'] = { t:'n', f: "SUM(A1:A3*B1:B3)", F:"C1:C1" };
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```
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For a multi-cell array formula, every cell has the same array range but only the
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first cell specifies the formula. Consider `D1:D3=A1:A3*B1:B3`:
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```js
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// API function
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XLSX.utils.sheet_set_array_formula(worksheet, "D1:D3", "A1:A3*B1:B3");
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// ... OR raw operations
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worksheet['D1'] = { t:'n', F:"D1:D3", f:"A1:A3*B1:B3" };
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worksheet['D2'] = { t:'n', F:"D1:D3" };
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worksheet['D3'] = { t:'n', F:"D1:D3" };
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```
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Utilities and writers are expected to check for the presence of a `F` field and
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ignore any possible formula element `f` in cells other than the starting cell.
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They are not expected to perform validation of the formulae!
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**Dynamic Array Formulae**
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_Assign a dynamic array formula_
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```js
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XLSX.utils.sheet_set_array_formula(worksheet, range, formula, true);
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```
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Released in 2020, Dynamic Array Formulae are supported in the XLSX/XLSM and XLSB
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file formats. They are represented like normal array formulae but have special
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cell metadata indicating that the formula should be allowed to adjust the range.
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An array formula can be marked as dynamic by setting the cell's `D` property to
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true. The `F` range is expected but can be the set to the current cell:
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```js
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// API function
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XLSX.utils.sheet_set_array_formula(worksheet, "C1", "_xlfn.UNIQUE(A1:A3)", 1);
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// ... OR raw operations
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worksheet['C1'] = { t: "s", f: "_xlfn.UNIQUE(A1:A3)", F:"C1", D: 1 }; // dynamic
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```
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**Localization with Function Names**
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SheetJS operates at the file level. Excel stores formula expressions using the
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English (United States) function names. For non-English users, Excel uses a
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localized set of function names.
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For example, when the computer language and region is set to French (France),
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Excel interprets `=SOMME(A1:C3)` as if `SOMME` is the `SUM` function. However,
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in the actual file, Excel stores `SUM(A1:C3)`.
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**Prefixed "Future Functions"**
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Functions introduced in newer versions of Excel are prefixed with `_xlfn.` when
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stored in files. When writing formula expressions using these functions, the
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prefix is required for maximal compatibility:
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```js
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// Broadest compatibility
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XLSX.utils.sheet_set_array_formula(worksheet, "C1", "_xlfn.UNIQUE(A1:A3)", 1);
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// Can cause errors in spreadsheet software
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XLSX.utils.sheet_set_array_formula(worksheet, "C1", "UNIQUE(A1:A3)", 1);
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```
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When reading a file, the `xlfn` option preserves the prefixes.
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<details>
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<summary><b> Functions requiring `_xlfn.` prefix</b> (click to show)</summary>
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This list is growing with each Excel release.
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```
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ACOT
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ACOTH
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AGGREGATE
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ARABIC
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BASE
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BETA.DIST
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BETA.INV
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BINOM.DIST
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BINOM.DIST.RANGE
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BINOM.INV
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BITAND
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BITLSHIFT
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BITOR
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BITRSHIFT
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BITXOR
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BYCOL
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BYROW
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CEILING.MATH
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CEILING.PRECISE
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CHISQ.DIST
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CHISQ.DIST.RT
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CHISQ.INV
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CHISQ.INV.RT
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CHISQ.TEST
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COMBINA
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CONFIDENCE.NORM
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CONFIDENCE.T
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COT
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COTH
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COVARIANCE.P
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COVARIANCE.S
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CSC
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CSCH
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DAYS
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DECIMAL
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ERF.PRECISE
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ERFC.PRECISE
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EXPON.DIST
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F.DIST
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F.DIST.RT
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F.INV
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F.INV.RT
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F.TEST
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FIELDVALUE
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FILTERXML
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FLOOR.MATH
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FLOOR.PRECISE
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FORMULATEXT
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GAMMA
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GAMMA.DIST
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GAMMA.INV
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GAMMALN.PRECISE
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GAUSS
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HYPGEOM.DIST
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IFNA
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IMCOSH
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IMCOT
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IMCSC
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IMCSCH
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IMSEC
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IMSECH
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IMSINH
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IMTAN
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ISFORMULA
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ISOMITTED
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ISOWEEKNUM
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LAMBDA
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LET
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LOGNORM.DIST
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LOGNORM.INV
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MAKEARRAY
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MAP
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MODE.MULT
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MODE.SNGL
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MUNIT
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NEGBINOM.DIST
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NORM.DIST
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NORM.INV
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NORM.S.DIST
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NORM.S.INV
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NUMBERVALUE
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PDURATION
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PERCENTILE.EXC
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PERCENTILE.INC
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PERCENTRANK.EXC
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PERCENTRANK.INC
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PERMUTATIONA
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PHI
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POISSON.DIST
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QUARTILE.EXC
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QUARTILE.INC
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QUERYSTRING
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RANDARRAY
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RANK.AVG
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RANK.EQ
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REDUCE
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RRI
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SCAN
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SEC
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SECH
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SEQUENCE
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SHEET
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SHEETS
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SKEW.P
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SORTBY
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STDEV.P
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STDEV.S
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T.DIST
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T.DIST.2T
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T.DIST.RT
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T.INV
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T.INV.2T
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T.TEST
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UNICHAR
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UNICODE
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UNIQUE
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VAR.P
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VAR.S
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WEBSERVICE
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WEIBULL.DIST
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XLOOKUP
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XOR
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Z.TEST
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```
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</details>
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