highcharts自定义导出文件格式(csv) highcharts的一些使用心得

highcharts是国外的一个图表插件，包括各种数据图形展示，柱形图，线性图等等，是手机端和pc端最好的图表插件之一，相比于百度的echarts更加轻便和易懂。链接http://www.hcharts.cn/。之前的highcharts版本都是支持图表导出功能的，导出的可以为图片文件和pdf以及svg文件，为了更加方便地查看图表数据和分析数据，我们还是需要导出具体的series和categories数据，我们的想法是导出为excel文件或者csv文件，以上两者都可以直接用excel打开。

之前也有一篇借用浏览器的ActiveX插件来实现导出excel文件的文章：http://www.stepday.com/topic/?544 今天我们就来扩展一下highcharts如何直接导出csv格式的文件。

根据highcharts官方的扩展组件来看，我们需要下载导出csv的核心js文件：https://rawgithub.com/highslide-software/export-csv/master/export-csv.js 可以点击下载至本地也可以直接在自己的页面内引入，形如：

1.<script src="http://code.highcharts.com/highcharts.js"></script>

2.<script src="http://code.highcharts.com/modules/exporting.js"></script>

3.<script src="https://rawgithub.com/highslide-software/export-csv/master/export-csv.js"></script>

我们先看一下export-csv源文件。这些文件都是属于highcharts插件，可以去官网插件里找到然后下载使用。

/**
 * A Highcharts plugin for exporting data from a rendered chart as CSV, XLS or HTML table
 *
 * Author:   Torstein Honsi
 * Licence:  MIT
 * Version:  1.4.2
 */
/*global Highcharts, window, document, Blob */
(function (factory) {
    if (typeof module === 'object' && module.exports) {
        module.exports = factory;
    } else {
        factory(Highcharts);
    }
})(function (Highcharts) {

    'use strict';

    var each = Highcharts.each,
        pick = Highcharts.pick,
        seriesTypes = Highcharts.seriesTypes,
        downloadAttrSupported = document.createElement('a').download !== undefined;

    Highcharts.setOptions({
        lang: {
            downloadCSV: 'Download CSV',
            downloadXLS: 'Download XLS',
            viewData: 'View data table'
        }
    });

    /**
     * Get the data rows as a two dimensional array
     */
    Highcharts.Chart.prototype.getDataRows = function () {
        var options = (this.options.exporting || {}).csv || {},
            xAxis = this.xAxis[0],
            rows = {},
            rowArr = [],
            dataRows,
            names = [],
            i,
            x,
            xTitle = xAxis.options.title && xAxis.options.title.text,

            // Options
            dateFormat = options.dateFormat || '%Y-%m-%d %H:%M:%S',
            columnHeaderFormatter = options.columnHeaderFormatter || function (series, key, keyLength) {
                return series.name + (keyLength > 1 ? ' ('+ key + ')' : '');
            };

        // Loop the series and index values
        i = 0;
        each(this.series, function (series) {
            var keys = series.options.keys,
                pointArrayMap = keys || series.pointArrayMap || ['y'],
                valueCount = pointArrayMap.length,
                requireSorting = series.requireSorting,
                categoryMap = {},
                j;

            // Map the categories for value axes
            each(pointArrayMap, function (prop) {
                categoryMap[prop] = (series[prop + 'Axis'] && series[prop + 'Axis'].categories) || [];
            });

            if (series.options.includeInCSVExport !== false && series.visible !== false) { // #55
                j = 0;
                while (j < valueCount) {
                    names.push(columnHeaderFormatter(series, pointArrayMap[j], pointArrayMap.length));
                    j = j + 1;
                }

                each(series.points, function (point, pIdx) {
                    var key = requireSorting ? point.x : pIdx,
                        prop,
                        val;

                    j = 0;

                    if (!rows[key]) {
                        rows[key] = [];
                    }
                    rows[key].x = point.x;

                    // Pies, funnels, geo maps etc. use point name in X row
                    if (!series.xAxis || series.exportKey === 'name') {
                        rows[key].name = point.name;
                    }

                    while (j < valueCount) {
                        prop = pointArrayMap[j]; // y, z etc
                        val = point[prop];
                        rows[key][i + j] = pick(categoryMap[prop][val], val); // Pick a Y axis category if present
                        j = j + 1;
                    }

                });
                i = i + j;
            }
        });

        // Make a sortable array
        for (x in rows) {
            if (rows.hasOwnProperty(x)) {
                rowArr.push(rows[x]);
            }
        }
        // Sort it by X values
        rowArr.sort(function (a, b) {
            return a.x - b.x;
        });

        // Add header row
        if (!xTitle) {
            xTitle = xAxis.isDatetimeAxis ? 'DateTime' : 'Category';
        }
        dataRows = [[xTitle].concat(names)];

        // Add the category column
        each(rowArr, function (row) {

            var category = row.name;
            if (!category) {
                if (xAxis.isDatetimeAxis) {
                    if (row.x instanceof Date) {
                        row.x = row.x.getTime();
                    }
                    category = Highcharts.dateFormat(dateFormat, row.x);
                } else if (xAxis.categories) {
                    category = pick(xAxis.names[row.x], xAxis.categories[row.x], row.x)
                } else {
                    category = row.x;
                }
            }

            // Add the X/date/category
            row.unshift(category);
            dataRows.push(row);
        });

        return dataRows;
    };

    /**
     * Get a CSV string
     */
    Highcharts.Chart.prototype.getCSV = function (useLocalDecimalPoint) {
        var csv = '',
            rows = this.getDataRows(),
            options = (this.options.exporting || {}).csv || {},
            itemDelimiter = options.itemDelimiter || ',', // use ';' for direct import to Excel
            lineDelimiter = options.lineDelimiter || '\n'; // '\n' isn't working with the js csv data extraction

        // Transform the rows to CSV
        each(rows, function (row, i) {
            var val = '',
                j = row.length,
                n = useLocalDecimalPoint ? (1.1).toLocaleString()[1] : '.';
            while (j--) {
                val = row[j];
                if (typeof val === "string") {
                    val = '"' + val + '"';
                }
                if (typeof val === 'number') {
                    if (n === ',') {
                        val = val.toString().replace(".", ",");
                    }
                }
                row[j] = val;
            }
            // Add the values
            csv += row.join(itemDelimiter);

            // Add the line delimiter
            if (i < rows.length - 1) {
                csv += lineDelimiter;
            }
        });
        return csv;
    };

    /**
     * Build a HTML table with the data
     */
    Highcharts.Chart.prototype.getTable = function (useLocalDecimalPoint) {
        var html = '<table>',
            rows = this.getDataRows();

        // Transform the rows to HTML
        each(rows, function (row, i) {
            var tag = i ? 'td' : 'th',
                val,
                j,
                n = useLocalDecimalPoint ? (1.1).toLocaleString()[1] : '.';

            html += '<tr>';
            for (j = 0; j < row.length; j = j + 1) {
                val = row[j];
                // Add the cell
                if (typeof val === 'number') {
                    val = val.toString();
                    if (n === ',') {
                        val = val.replace('.', n);
                    }
                    html += '<' + tag + ' class="number">' + val + '</' + tag + '>';

                } else {
                    html += '<' + tag + '>' + (val === undefined ? '' : val) + '</' + tag + '>';
                }
            }

            html += '</tr>';
        });
        html += '</table>';
        return html;
    };

    function getContent(chart, href, extension, content, MIME) {
        var a,
            blobObject,
            name,
            options = (chart.options.exporting || {}).csv || {},
            url = options.url || 'http://www.highcharts.com/studies/csv-export/download.php';

        if (chart.options.exporting.filename) {
            name = chart.options.exporting.filename;
        } else if (chart.title) {
            name = chart.title.textStr.replace(/ /g, '-').toLowerCase();
        } else {
            name = 'chart';
        }

        // MS specific. Check this first because of bug with Edge (#76)
        if (window.Blob && window.navigator.msSaveOrOpenBlob) {
            // Falls to msSaveOrOpenBlob if download attribute is not supported
            blobObject = new Blob([content]);
            window.navigator.msSaveOrOpenBlob(blobObject, name + '.' + extension);

        // Download attribute supported
        } else if (downloadAttrSupported) {
            a = document.createElement('a');
            a.href = href;
            a.target = '_blank';
            a.download = name + '.' + extension;
            document.body.appendChild(a);
            a.click();
            a.remove();

        } else {
            // Fall back to server side handling
            Highcharts.post(url, {
                data: content,
                type: MIME,
                extension: extension
            });
        }
    }

    /**
     * Call this on click of 'Download CSV' button
     */
    Highcharts.Chart.prototype.downloadCSV = function () {
        var csv = this.getCSV(true);
        getContent(
            this,
            'data:text/csv,\uFEFF' + csv.replace(/\n/g, '%0A'),
            'csv',
            csv,
            'text/csv'
        );
    };

    /**
     * Call this on click of 'Download XLS' button
     */
    Highcharts.Chart.prototype.downloadXLS = function () {
        var uri = 'data:application/vnd.ms-excel;base64,',
            template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40">' +
                '<head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet>' +
                '<x:Name>Ark1</x:Name>' +
                '<x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]-->' +
                '<style>td{border:none;font-family: Calibri, sans-serif;} .number{mso-number-format:"0.00";}</style>' +
                '<meta name=ProgId content=Excel.Sheet>' +
                '<meta charset=UTF-8>' +
                '</head><body>' +
                this.getTable(true) +
                '</body></html>',
            base64 = function (s) {
                return window.btoa(unescape(encodeURIComponent(s))); // #50
            };
        getContent(
            this,
            uri + base64(template),
            'xls',
            template,
            'application/vnd.ms-excel'
        );
    };

    /**
     * View the data in a table below the chart
     */
    Highcharts.Chart.prototype.viewData = function () {
        if (!this.insertedTable) {
            var div = document.createElement('div');
            div.className = 'highcharts-data-table';
            // Insert after the chart container
            this.renderTo.parentNode.insertBefore(div, this.renderTo.nextSibling);
            div.innerHTML = this.getTable();
            this.insertedTable = true;
        }
    };

    // Add "Download CSV" to the exporting menu. Use download attribute if supported, else
    // run a simple PHP script that returns a file. The source code for the PHP script can be viewed at
    // https://raw.github.com/highslide-software/highcharts.com/master/studies/csv-export/csv.php
    if (Highcharts.getOptions().exporting) {
        Highcharts.getOptions().exporting.buttons.contextButton.menuItems.push({
            textKey: 'downloadCSV',
            onclick: function () { this.downloadCSV(); }
        }, {
            textKey: 'downloadXLS',
            onclick: function () { this.downloadXLS(); }
        }, {
            textKey: 'viewData',
            onclick: function () { this.viewData(); }
        });
    }

    // Series specific
    if (seriesTypes.map) {
        seriesTypes.map.prototype.exportKey = 'name';
    }
    if (seriesTypes.mapbubble) {
        seriesTypes.mapbubble.prototype.exportKey = 'name';
    }

});

　当我们加上exporting.js的时候下载选项菜单就出来了对吧，如图:

你们的应该是英文的，具体变成中文设置如下：

Highcharts.setOptions({
lang: {　
printChart: "打印图表",
downloadJPEG: "下载JPEG 图片",
downloadPDF: "下载PDF文档",
downloadPNG: "下载PNG 图片",
downloadSVG: "下载SVG 矢量图",
exportButtonTitle: "导出图片",
downloadCSV:"下载CSV格式文件",
downloadXLS:"下载XLS格式文件"
}
});

这段代码是highcharts全区设置里放在$(document).ready({放这就行了});

这个Viewdata table很蛋疼，点击了显示没办法隐藏了。所以这里我们把它去掉，上面export_csv.js去掉红色关于viewdata的部分就行了，注释掉即可。

自定义下载按钮下载文件格式为csv:

解读它的插件js可以看到上面我标记为绿色的部分，这两行代码就是下载的执行代码。那我们直接可以调用就行了：

// 下载图表
$('.pr_li_1').click(function() {
 if (index == 0) {
    g_chart = $('#chart_C').highcharts(); //得到上面图表的对象
    g_chart.downloadCSV();
}else if (index == 1) {
   g2_chart = $('#LTV_chart').highcharts(); //得到上面图表的对象
   g2_chart.downloadCSV();
  }
});

这样就是点击按钮下载csv文档格式了，你也可以写成XLS格式的。

有的人是想简单的就是下载图片png或者img格式，那这个就是更改exporting.js了，具体操作很简单，查看官网的exporting就行了。

表格重绘：

有的人想要表格重新刷新或者重新绘制一下那种效果，可以用在table切换后，或者隐藏显示，刷新数据以后。这个很简单，调用一下就行了：chart1 = new Highcharts.Chart(chart);

上面那就要这么写:

chart = {
credits: {
text: null,
},
chart: {
// type: 'column',
renderTo: 'chart_C',
zoomType: 'xy',
// inverted: false
},
exporting: {
enabled: false
},......................略.