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minimalistic JavaScript OOXML Excel export

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elxml
=====

A minimalistic Excel OOXML writer.

[![NPM Version](http://img.shields.io/npm/v/elxml.svg?style=flat-square)](https://npmjs.com/package/elxml)
[![License](http://img.shields.io/npm/l/elxml.svg?style=flat-square)](http://opensource.org/licenses/MIT)

The main purpose is to create simple Excel files via JavaScript. The current implementation supports

1. Multiple sheets
2. Creation of rows and cells
3. Column width definition
4. PatternFills for cells
5. Borders for cells
6. Number formats for cells
7. Fonts for cells
8. Merge cells
9. AutoFilter

elxml allows to use string tables to save memory.

Uses [xmlbuilder-js](https://github.com/oozcitak/xmlbuilder-js),
[archiver](https://github.com/ctalkington/node-archiver) and [underscore](https://github.com/jashkenas/underscore)

### Usage

Create a workbook:

```javascript
var excel = require("elxml.js");
var wb = excel.createWorkbook();
```

Create a sheet within the workbook:

```javascript
var sheet = wb.addSheet("mySheet");
```

Add a row with a single cell and set a value for the cell

```javascript
var row = sheet.addRow(1);
var cell = row.addCell("A","d");  // the value is a date in ISO standard notation
cell.setValue("2014-02-02");
```

Last step is to save the workbook:

```javascript
wb.save("test.01.xlsx", function(err) {
    if (!err) {
        console.log("File saved!");
    } else {
        console.log(err);
    }
});
```

### Advanced usage

#### Number formats

The above example creates an Excel file with a date cell but without a proper number format.

To apply the number format to the cell we have to create a cell style. Cell styles are based on 
a default cell style which defines the number format, fill, borders and the font for those cells
which don't use any cell style. 
In elxml the default is: Calibri with a size of 11, no borders, no fill, no number format.

Lets set a date number format to see a better formatted date in Excel:

```javascript
// create a date format
var dateFrmt = wb.addNumberFormat("dd/mm/yy;@");

// get the predefined default style
var defStyle = wb.getStyle("Standard");

// derive a new style from the default style
var dateStyle = wb.addStyle(defStyle, {numFrmt: dateFrmt});

// apply the style
cell.setStyle(dateStyle);
```

Another Example

```javascript
// create a date format
var dateFrmt = wb.addNumberFormat("DD/MM/YYYY\\ HH:MM:SS");

// create a default style
var defStyle = wb.createStyle("Standard");
// derive a new style from the default style
var dateStyle = wb.addStyle(defStyle, {numFrmt: dateFrmt});

// format value to MSDATE format
var value = moment( "2014-06-17 08:55:49" ).toOADate();

// set cell type
var cell = row.addCell( "A" , excel.CELL_TYPE_MSDATE );

// apply the style
cell.setStyle(dateStyle);

// write data to cell
cell.setValue( value );
```

To see which number formats are available take a look at the OOXML spec.

#### Strings

By default strings are saved as inline strings.

```javascript
// add a cell with a string value
var cell1 = row.addCell("D");      // excel.CELL_TYPE_STRING is default
cell1.setValue("Hello World!");

var cell2 = row.addCell("D",excel.CELL_TYPE_STRING);    // set type
cell2.setValue("Hello World!");
```

In case you have tables with many similar string values you can enable the "shared string" function.
Note that this must be done for every cell as inline strings are the default.

```javascript
// add a cell with a string value
var cell = row.addCell("D",excel.CELL_TYPE_STRING_TAB);
cell.setValue("Hello World!");
```

This will save memory while saving and speed up loading of the created Excel file.

#### Fills

You can define pattern fills. Possible options for a pattern fill are: `fgColor`, `bgColor` and `type`.
Lets create a red solid fill:

```javascript
// create a color (RGBA)
var red = wb.color(255,0,0,0);
// create a pattern fill
var redFill = wb.addPatternFill({fgColor:red, type:excel.PATTERN_TYPE_SOLID});
// create a cell style with the red fill
var redFillStyle = wb.addStyle(defStyle, {fill: redFill});
// apply the style
cell.setStyle(dateStyle);
```

#### Borders
You can define the borders for a cell. First you have to create a border representation object
which is used to define the border style.

```javascript
// create a color (RGBA)
var black = wb.color(0,0,0,0);
// create a thick border presentation with a black color
var thickBorderPr = wb.createBorderPr(excel.BORDER_STYLE_THICK, black);
// create a border type, bottom line is set to thickBorderPr
var border = wb.addBorder({bottom:thickBorderPr});
// create a cell style with the border
var borderStyle = wb.addStyle(defStyle, {border: border});
// apply the style
cell.setStyle(borderStyle);
```

#### Fonts
You can create new fonts which are derived from the default font.
You can set the size and whether the font is bold or not (default).

```javascript
// create a bold font, the font is derived from the default font
var boldFont = wb.addFont({bold: true});
// create a cell style with the bold font
var boldFontStyle = wb.addStyle(defStyle, {font: boldFont});
// apply the style
cell.setStyle(boldFontStyle);
```

#### Column width

Define the width for one or more columns:

```javascript
// set the width of the first column to 30
sheet.setColumn(1,1,30);
// set the width of columns 2 - 5 to 50
sheet.setColumn(2,5,50);
```

#### Merge cells

```javascript
// merge cells horizontal
sheet.mergeCell("A2:D2");
// merge cells vertical
sheet.mergeCell("A3:A6");
```

#### AutoFilter

```javascript
// use a range which contains data! 
sheet.setAutoFilter("A1:D1");
```

#### Change history

0.1.3 - add callback to Workbook.save method  
0.1.4 - fixed issues #8, #9  
0.1.5 - add support for italics, text rotation and text wrapping  
0.1.6 - a 'Standard' style is created by default, access it via the getStyle function  
0.2.0 - add Workbook.saveToStream to save the resulting ZIP directly to a file stream  
0.2.1 - fixed issue with wrong style IDs  
0.3.0 - add basic support for AutoFilter, fixed error in string table  
0.3.1 - add Row.setStyleForAllCells convenience method

elxml

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