Echarts 数据视图 生成Excel的方法

一、生成Excel，两大方向：
1后台生成Excel 

 查询数据库，使用NOPI生产Excel。
2前台js生成Excel三种方式
1）jquery.table2excel.js

--采用，优势：兼容IE和Chrome。

2）handsontable 0.32.0

问题：不兼容IE。
3）手写js有兼容性问题。

问题：浏览器兼容型问题等。

考虑到这里只需要将Echarts的数据视图生成Excel，采用最简单有效的方式：jquery.table2excel.js。

二、方案

       1、 jquery.table2excel.js  和Echarts数据视图结合的取巧方案

第一步：应用js脚本，先jquery脚本后table2excel脚本。

< script  src="~/Scripts/jquery-1.10.2.js"> script >

< script  src="~/Scripts/table2excel/jquery.table2excel.js"> script >

 第二步：重写dataView-contentToOption方法，注意不能设为只读。

toolbox: {
    right: '20px',

    feature: {
        dataView: {
            show: true,
            title: '数据视图',
            //readOnly: true, //设置只读，会隐藏刷新按钮。
            lang: ['数据视图', '关闭', '导出Excel'],
            contentToOption: function (opts) {
                $("#tableExcel_Day").table2excel({
                    exclude: ".noExl", //过滤位置的 css 类名
                    filename: productSelectName + '每日价格走势图' + ".xls", //文件名称
                    name: "Excel Document Name.xls",
                    exclude_img: true,
                    exclude_links: true,
                    exclude_inputs: true
                });
            },
            optionToContent: function (opt) {
               // console.log(opt);

                var axisData = opt.xAxis[0].data; //坐标数据
                var series = opt.series; //折线图数据
                var tdHeads = '< td   style="padding: 0 10px">时间 td >'; //表头第一列

                var tdBodys = ''; //表数据
                //组装表头
                var nameData = new Array('田头价格', '批发价格', '零售价格', '交易量');
                for (var i = 0; i <  nameData.length ; i++) {
                    tdHeads += '' + nameData[i] + ' td >';

                }
                var table = '< table  id="tableExcel_Day" border="1" class="table-bordered table-striped" style="width:100%;text-align:center" >< tbody >< tr >' + tdHeads + ' tr >';

                //组装表数据
                for (var i = 0, l = axisData.length; i & l t; l; i++) {
                    for (var j = 0; j < series.length ; j++) {
                        var temp = series[j].data[i];
                        if (temp != null && temp != undefined) {
                            tdBodys += '' + temp.toFixed(2) + ' td >';

                        } else {
                            tdBodys += '< td > td >';

                        }
                    }
                    table += '< tr >< td  style="padding: 0 10px">' + axisData[i] + ' td >' + tdBodys + ' tr >';

                    tdBodys = '';
                }
                table += ' tbody > table >';

               // console.log(table);
                return table;

            }
        },
        dataZoom: { show: true, title: { zoom: '区域缩放', back: '区域缩放还原' } },
        saveAsImage: { show: true }
    }
},

解释 1、通过id即tableExcel_Day来找到表格。

            2、exclude: “.noExl” ： 有class = “noExl” 的行不被导出；

第三步：效果图

点击“导出Excel”

 存在的问题：点击“生成Excel”按钮后，视图会跳转，因为这是原本是刷新按钮，目前还未解决。

三、jquery.table2excel.js 脚本：

/*
 *  jQuery table2excel - v1.1.1
 *  jQuery plugin to export an .xls file in browser from an HTML table
 *  https://github.com/rainabba/jquery-table2excel
 *
 *  Made by rainabba
 *  Under MIT License
 */
/*
 *  jQuery table2excel - v1.1.1
 *  jQuery plugin to export an .xls file in browser from an HTML table
 *  https://github.com/rainabba/jquery-table2excel
 *
 *  Made by rainabba
 *  Under MIT License
 */
//table2excel.js
;(function ( $, window, document, undefined ) {
    var pluginName = "table2excel",

    defaults = {
        exclude: ".noExl",
        name: "Table2Excel",
        filename: "table2excel",
        fileext: ".xls",
        exclude_img: true,
        exclude_links: true,
        exclude_inputs: true
    };

    // The actual plugin constructor
    function Plugin ( element, options ) {
            this.element = element;
            // jQuery has an extend method which merges the contents of two or
            // more objects, storing the result in the first object. The first object
            // is generally empty as we don't want to alter the default options for
            // future instances of the plugin
            //
            this.settings = $.extend( {}, defaults, options );
            this._defaults = defaults;
            this._name = pluginName;
            this.init();
    }

    Plugin.prototype = {
        init: function () {
            var e = this;

            var utf8Heading = "< meta  http-equiv=\"content-type\" content=\"application/vnd.ms-excel; charset=UTF-8\">";
            e.template = {
                head: "< 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\">" + utf8Heading + "< head > head >< body >",

                table: {
                    head: "< table >",
                    tail: " table >"

                },
                foot: " body > html >"

            };

            e.tableRows = [];

            // get contents of table except for exclude
            $(e.element).each( function(i,o) {
                var tempRows = "";
                $(o).find("tr").not(e.settings.exclude).each(function (i,p) {

                    tempRows += "< tr >";
                    $(p).find("td,th").not(e.settings.exclude).each(function (i,q) { // p did not exist, I corrected

                        var rc = {
                            rows: $(this).attr("rowspan"),
                            cols: $(this).attr("colspan"),
                            flag: $(q).find(e.settings.exclude)
                        };

                        if( rc.flag.length > 0 ) {
                            tempRows += "< td > td >"; // exclude it!!

                        } else {
                            if( rc.rows  & rc.cols ) {
                                tempRows += "< td >" + $(q).html() + " td >";

                            } else {
                                tempRows += "< td ";
                                if( rc.rows > 0) {
                                    tempRows += " rowspan=\'" + rc.rows + "\' ";
                                }
                                if( rc.cols > 0) {
                                    tempRows += " colspan=\'" + rc.cols + "\' ";
                                }
                                tempRows += "/>" + $(q).html() + " td >";

                            }
                        }
                    });

                    tempRows += " tr >";

                   // console.log(tempRows);

                });
                // exclude img tags
                if(e.settings.exclude_img) {
                    tempRows = exclude_img(tempRows);
                }

                // exclude link tags
                if(e.settings.exclude_links) {
                    tempRows = exclude_links(tempRows);
                }

                // exclude input tags
                if(e.settings.exclude_inputs) {
                    tempRows = exclude_inputs(tempRows);
                }
                e.tableRows.push(tempRows);
            });

            e.tableToExcel(e.tableRows, e.settings.name, e.settings.sheetName);
        },

        tableToExcel: function (table, name, sheetName) {
            var e = this, fullTemplate="", i, link, a;

            e.format = function (s, c) {
                return s.replace(/{(\w+)}/g, function (m, p) {
                    return c[p];
                });
            };

            sheetName = typeof sheetName === "undefined" ? "Sheet" : sheetName;

            e.ctx = {
                worksheet: name || "Worksheet",
                table: table,
                sheetName: sheetName
            };

            fullTemplate= e.template.head;

            if ( $.isArray(table) ) {
                for (i in table) {
                      //fullTemplate += e.template.sheet.head + "{worksheet" + i + "}" + e.template.sheet.tail;
                      fullTemplate += e.template.sheet.head + sheetName + i + e.template.sheet.tail;
                }
            }

            fullTemplate += e.template.mid;

            if ( $.isArray(table) ) {
                for (i in table) {
                    fullTemplate += e.template.table.head + "{table" + i + "}" + e.template.table.tail;
                }
            }

            fullTemplate += e.template.foot;

            for (i in table) {
                e.ctx["table" + i] = table[i];
            }
            delete e.ctx.table;

            var isIE = /*@cc_on!@*/false || !!document.documentMode; // this works with IE10 and IE11 both :)
            //if (typeof msie !== "undefined" && msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./))      // this works ONLY with IE 11!!!
            if (isIE) {
                if (typeof Blob !== "undefined") {
                    //use blobs if we can
                    fullTemplate = e.format(fullTemplate, e.ctx); // with this, works with IE
                    fullTemplate = [fullTemplate];
                    //convert to array
                    var blob1 = new Blob(fullTemplate, { type: "text/html" });
                    window.navigator.msSaveBlob(blob1, getFileName(e.settings) );
                } else {
                    //otherwise use the iframe and save
                    //requires a blank iframe on page called txtArea1
                    txtArea1.document.open("text/html", "replace");
                    txtArea1.document.write(e.format(fullTemplate, e.ctx));
                    txtArea1.document.close();
                    txtArea1.focus();
                    sa = txtArea1.document.execCommand("SaveAs", true, getFileName(e.settings) );
                }

            } else {
                var blob = new Blob([e.format(fullTemplate, e.ctx)], {type: "application/vnd.ms-excel"});
                window.URL = window.URL || window.webkitURL;
                link = window.URL.createObjectURL(blob);
                a = document.createElement("a");
                a.download = getFileName(e.settings);
                a.href = link;

                document.body.appendChild(a);

                a.click();

                document.body.removeChild(a);
            }

            return true;
        }
    };

    function getFileName(settings) {
        return ( settings.filename ? settings.filename : "table2excel" );
    }

    // Removes all img tags
    function exclude_img(string) {
        var _patt = /(\s+alt\s*=\s*"([^"]*)"|\s+alt\s*=\s*'([^']*)')/i;
        return string.replace(/< img [^>]*>/gi, function myFunction(x){
            var res = _patt.exec(x);
            if (res !== null && res.length >=2) {
                return res[2];
            } else {
                return "";
            }
        });
    }

    // Removes all link tags
    function exclude_links(string) {
        return string.replace(/< a [^>]*>|<\/a>/gi, "");
    }

    // Removes input params
    function exclude_inputs(string) {
        var _patt = /(\s+value\s*=\s*"([^"]*)"|\s+value\s*=\s*'([^']*)')/i;
        return string.replace(/< input [^>]*>|<\/input>/gi, function myFunction(x){
            var res = _patt.exec(x);
            if (res !== null && res.length >=2) {
                return res[2];
            } else {
                return "";
            }
        });
    }

    $.fn[ pluginName ] = function ( options ) {
        var e = this;
            e.each(function() {
                if ( !$.data( e, "plugin_" + pluginName ) ) {
                    $.data( e, "plugin_" + pluginName, new Plugin( this, options ) );
                }
            });

        // chain jQuery functions
        return e;
    };

})( jQuery, window, document );