index.js

/* jslint node: true */
'use strict';

function isDefined(x) {
    return x !== undefined && x !== null;
}

function tablify(options) {
    options = options || {};
    var tableData = options.data || [];
    var header = options.header;
    var border = isDefined(options.border) ? options.border : 1;
    var cellspacing = isDefined(options.cellspacing) ? options.cellspacing : 0;
    var cellpadding = isDefined(options.cellpadding) ? options.cellpadding : 0;
    var tableId = options.table_id || 'tablify';
    var tableClass = options.table_class || 'tablify';
    var header_mapping = options.header_mapping || {};
    var pretty = options.pretty;
    if (pretty === undefined) {
        pretty = true;
    }
    var isSingleRow = false;
    if (!Array.isArray(tableData)) {
        isSingleRow = true;
        tableData = [tableData];
    }

    // If header exists in options use that else create it.
    if (!Array.isArray(header)) {
        var headerObj = {};
        tableData.forEach(function (json) {
            var keys = Object.keys(json);
            keys.forEach(function (key) {
                headerObj[key] = true;
            });
        });
        header = Object.keys(headerObj);
    }

    if (isSingleRow && tableData.length === 1) {
        // Don't create row if value is not defined for the header (key for objects)
        header = header.filter(function (h) {
            return tableData[0][h];
        });
    }

    // Generate table
    var htmlTable = '';
    var cellArray = [];
    var cellRow = [];
    cellArray.push(cellRow);
    header.forEach(function (key) {
        cellRow.push('<th>' + (header_mapping[key] || key) + '</th>');
    });
    tableData.forEach(function (json) {
        cellRow = [];
        cellArray.push(cellRow);
        header.forEach(function (key) {
            var value = json[key];
            if (value === undefined) {
                value = '';
            } else if (typeof value !== 'string') {
                value = JSON.stringify(value);
            }
            cellRow.push('<td>' + value + '</td>');
        });
    });

    var i, j;
    if (isSingleRow && cellArray.length) {
        // Transpose the array to show object as key-value pair instead of table
        cellArray = cellArray[0].map(function(col, i) {
            return cellArray.map(function(row) {
                return row[i];
            })
        });
    }

    var newLine = '';
    var indent = '';
    if (pretty) {
        newLine = '\n';
        indent = '  ';
    }
    if (options.css) {
        htmlTable += `<style>${newLine}${indent}${options.css}${newLine}</style>${newLine}`
    }
    if (tableData.length) {
        htmlTable += '<table id="' + tableId + '" class="' + tableClass + '" border="' + border + '" cellspacing="' + cellspacing + '" cellpadding="' + cellpadding + '">';
        for (i = 0; i < cellArray.length; i++) {
            htmlTable += newLine;
            htmlTable += indent;
            htmlTable += '<tr>';
            for (j = 0; j < cellArray[i].length; j++) {
                htmlTable += newLine;
                htmlTable += indent;
                htmlTable += indent;
                htmlTable += cellArray[i][j];
            }
            htmlTable += newLine;
            htmlTable += indent;
            htmlTable += '</tr>';
        }
        htmlTable += newLine;
        htmlTable += '</table>';
    }
    return htmlTable;
}

var html_tablify = {
    tablify: tablify
};

module.exports = html_tablify;