excel4node/lib/index.js

Library to create Formatted Excel Files.

var wb = require('./WorkBook.js'),
style = require('./Style.js');

exports.WorkBook = wb.WorkBook;
exports.Style = style.Style;

Number.prototype.toExcelAlpha = function(isCaps) {
    isCaps=isCaps?isCaps:true;
	var remaining = this;
	var aCharCode = isCaps ? 65 : 97;
    var columnName = '';
    while (remaining > 0) {
        var mod = (remaining - 1) % 26;
        columnName = String.fromCharCode(aCharCode + mod) + columnName;
        remaining = (remaining - 1 - mod) / 26;
    } 
    return columnName;
};

String.prototype.toExcelRowCol = function() {
	var numeric = this.split(/\D/).filter(function(el) { return el != '' })[0];
	var alpha = this.split(/\d/).filter(function(el) { return el != '' })[0];
	var row = parseInt(numeric, 10);
    var col = alpha.toUpperCase().split('').reduce(function(a, b, index, arr) {
        return a + (b.charCodeAt(0) - 64) * Math.pow(26, arr.length - index - 1);
    }, 0);
    return { row: row, col: col };
};

Date.prototype.getExcelTS = function(){
	var epoch = new Date(1899,11,31);
	var dt = this.setDate(this.getDate()+1);
	var ts = (dt-epoch)/(1000*60*60*24);
	return ts;
};