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JsonExcel.vue
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JsonExcel.vue
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<template>
<div :id="idName" @click="generate" :style="isDisabled?{
'opacity': '0.5',
'pointer-events': 'none'}:{}">
<slot> Download {{ name }}</slot>
</div>
</template>
<script>
import download from "downloadjs";
import {defineComponent, ref} from 'vue'
import * as XLSX from 'xlsx/xlsx.mjs';
import saveAs from 'file-saver';
export default defineComponent({
props: {
// If true, don't download but emit a Blob
emitBlob: {
type: Boolean,
default: false,
},
debounce: {
type: Number,
default: 500,
},
// mime type [xls, csv]
type: {
type: String,
default: "xls",
},
// Json to download
data: {
type: Array,
required: false,
default: null,
},
// fields inside the Json Object that you want to export
// if no given, all the properties in the Json are exported
fields: {
type: Object,
default: () => null,
},
// this prop is used to fix the problem with other components that use the
// variable fields, like vee-validate. exportFields works exactly like fields
exportFields: {
type: Object,
default: () => null,
},
// Use as fallback when the row has no field values
defaultValue: {
type: String,
required: false,
default: "",
},
// Title(s) for the data, could be a string or an array of strings (multiple titles)
header: {
default: null,
},
// Title(s) for single column data, must be an array (ex: ['titleCol0',,TitleCol2])
perColumnsHeaders: {
default: null,
},
// Footer(s) for the data, could be a string or an array of strings (multiple footers)
footer: {
default: null,
},
// filename to export
name: {
type: String,
default: "data.xls",
},
fetch: {
type: Function,
},
meta: {
type: Array,
default: () => [],
},
worksheet: {
type: String,
default: "Sheet1",
},
//event before generate was called
beforeGenerate: {
type: Function,
},
//event before download pops up
beforeFinish: {
type: Function,
},
// Determine if CSV Data should be escaped
escapeCsv: {
type: Boolean,
default: true,
},
rtl: {
type: Boolean,
default: false,
},
// long number stringify
stringifyLongNum: {
type: Boolean,
default: false,
},
formats: {
type: Object,
default: () => ({}),
},
widths: {
type: Object,
default: () => ({}),
},
},
setup() {
return {
isDisabled: ref(false)
}
},
computed: {
// unique identifier
idName() {
var now = new Date().getTime();
return "export_" + now;
},
downloadFields() {
if (this.fields) return this.fields;
if (this.exportFields) return this.exportFields;
},
},
methods: {
async generate() {
if (this.isDisabled) {
return; // return early if button is disabled
}
this.isDisabled = true
const debounce = this.$props.debounce
let timeoutId = null;
return new Promise((resolve, reject) => {
const executeGenerate = async () => {
if (typeof this.beforeGenerate === "function") {
await this.beforeGenerate();
}
let data = this.data;
if (typeof this.fetch === "function" || !data) data = await this.fetch();
if (!data || !data.length) {
if (typeof this.beforeFinish === "function") await this.beforeFinish();
return;
}
let json = await this.getProcessedJson(data, this.downloadFields);
if (this.type === "html") {
// this is mainly for testing
return this.export(
this.jsonToXLS(json),
this.name.replace(".xls", ".html"),
"text/html"
);
} else if (this.type === "csv") {
return this.export(
this.jsonToCSV(json),
this.name.replace(".xls", ".csv"),
"application/csv"
);
} else if (this.type === "xlsx") {
const xlsxBuffer = this.jsonToXLSX(json, this.worksheet);
return this.generateXLSX(xlsxBuffer, this.name);
}
return this.export(
this.jsonToXLS(json),
this.name,
"application/vnd.ms-excel"
);
};
const debouncedGenerate = () => {
let self = this;
if (timeoutId) {
clearTimeout(timeoutId);
}
timeoutId = setTimeout(() => {
executeGenerate().then(resolve).catch(reject);
self.isDisabled = false
}, debounce);
};
debouncedGenerate();
});
},
/*
Use downloadjs to generate the download link
*/
export: async function (data, filename, mime) {
let blob = this.base64ToBlob(data, mime);
if (typeof this.beforeFinish === "function") await this.beforeFinish();
if (this.emitBlob) this.$emit("blob", blob);
else download(blob, filename, mime);
},
generateXLSX(xlsxBuffer, fileName) {
function s2ab(s) {
let buf = new ArrayBuffer(s.length);
let view = new Uint8Array(buf);
for (let i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xff;
return buf;
}
if (typeof xlsxBuffer === 'string') {
xlsxBuffer = s2ab(xlsxBuffer);
}
saveAs(new Blob([xlsxBuffer], {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"}), fileName);
},
/*
jsonToXLS
---------------
Transform json data into an xml document with MS Excel format, sadly
it shows a prompt when it opens, that is a default behavior for
Microsoft office and cannot be avoided. It's recommended to use CSV format instead.
*/
jsonToXLS(data) {
let xlsTemp =
'<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><meta name=ProgId content=Excel.Sheet> <meta name=Generator content="Microsoft Excel 11"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>${worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--><style>br {mso-data-placement: same-cell;}</style></head><body><table>${table}</table></body></html>';
let xlsData = "<thead>";
const colspan = Object.keys(data[0]).length;
let _self = this;
//Header
const header = this.header || this.$attrs.title;
if (header) {
xlsData += this.parseExtraData(
header,
'<tr><th colspan="' + colspan + '">${data}</th></tr>'
);
}
// perColumnsHeaders
const perColumnsHeaders = this.perColumnsHeaders;
if (Array.isArray(perColumnsHeaders)) {
xlsData += "<tr>";
for (let pchKey in perColumnsHeaders) {
xlsData += "<th>" + perColumnsHeaders[pchKey] + "</th>";
}
xlsData += "</tr>";
}
//Fields
xlsData += "<tr>";
for (let key in data[0]) {
xlsData += "<th>" + key + "</th>";
}
xlsData += "</tr>";
xlsData += "</thead>";
//Data
xlsData += "<tbody>";
data.map(function (item, index) {
xlsData += "<tr>";
for (let key in item) {
xlsData +=
"<td>" +
_self.preprocessLongNum(
_self.valueReformattedForMultilines(item[key])
) +
"</td>";
}
xlsData += "</tr>";
});
xlsData += "</tbody>";
//Footer
if (this.footer != null) {
xlsData += "<tfoot>";
xlsData += this.parseExtraData(
this.footer,
'<tr><td colspan="' + colspan + '">${data}</td></tr>'
);
xlsData += "</tfoot>";
}
return xlsTemp
.replace("${table}", xlsData)
.replace("${worksheet}", this.worksheet);
},
/*
jsonToXLS
*/
// jsonToXLSX(data, worksheet) {
// const ws = XLSX.utils.json_to_sheet(data);
// const wb = XLSX.utils.book_new();
// XLSX.utils.book_append_sheet(wb, ws, worksheet || 'Sheet1');
// const buf = XLSX.write(wb, {
// type: 'buffer',
// mimeType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
// });
// return buf;
// },
jsonToXLSX(data, worksheet) {
const ws = XLSX.utils.json_to_sheet(data);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, worksheet || 'Sheet1');
if (this.rtl) {
wb.Workbook = {
Views: [
{RTL: true}
]
};
}
const formats = this.formats;
const range = XLSX.utils.decode_range(ws['!ref']);
for (let C = range.s.c; C <= range.e.c; ++C) {
const col = XLSX.utils.encode_col(C);
if (formats[col]) {
for (let R = range.s.r + 1; R <= range.e.r; ++R) { // +1 to skip the header row
const cell = ws[`${col}${R + 1}`];
if (cell) {
cell.z = formats[col];
}
}
}
}
const widths = this.widths;
for (let C = range.s.c; C <= range.e.c; ++C) {
const col = XLSX.utils.encode_col(C);
if (widths[col]) {
ws[`!cols`] = ws[`!cols`] || [];
ws[`!cols`][C] = {wch: widths[col]};
}
}
const buf = XLSX.write(wb, {
type: 'buffer',
bookType: 'xlsx',
mimeType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
});
return buf;
},
/*
jsonToCSV
---------------
Transform json data into an CSV file.
*/
jsonToCSV(data) {
let _self = this;
var csvData = [];
//Header
const header = this.header || this.$attrs.title;
if (header) {
csvData.push(this.parseExtraData(header, "${data}\r\n"));
}
// perColumnsHeaders
const perColumnsHeaders = this.perColumnsHeaders;
if (Array.isArray(perColumnsHeaders)) {
for (let pchKey in perColumnsHeaders) {
csvData.push(perColumnsHeaders[pchKey]);
csvData.push(",");
}
csvData.pop();
csvData.push("\r\n");
}
//Fields
for (let key in data[0]) {
csvData.push(key);
csvData.push(",");
}
csvData.pop();
csvData.push("\r\n");
//Data
data.map(function (item) {
for (let key in item) {
let escapedCSV = item[key] + "";
// Escaped CSV data to string to avoid problems with numbers or other types of values
// this is controlled by the prop escapeCsv
if (_self.escapeCsv) {
escapedCSV = '="' + escapedCSV + '"'; // cast Numbers to string
if (escapedCSV.match(/[,"\n]/)) {
escapedCSV = '"' + escapedCSV.replace(/\"/g, '""') + '"';
}
}
csvData.push(escapedCSV);
csvData.push(",");
}
csvData.pop();
csvData.push("\r\n");
});
//Footer
if (this.footer != null) {
csvData.push(this.parseExtraData(this.footer, "${data}\r\n"));
}
return csvData.join("");
},
/*
getProcessedJson
---------------
Get only the data to export, if no fields are set return all the data
*/
async getProcessedJson(data, header) {
let keys = this.getKeys(data, header);
let newData = [];
let _self = this;
await data.reduce(async function (prev, current) {
await prev;
let newItem = {};
for (let label in keys) {
let property = keys[label];
newItem[label] = await _self.getValue(property, current);
}
newData.push(newItem);
return true;
}, []);
return newData;
},
getKeys(data, header) {
if (header) {
return header;
}
let keys = {};
for (let key in data[0]) {
keys[key] = key;
}
return keys;
},
/*
parseExtraData
---------------
Parse title and footer attribute to the csv format
*/
parseExtraData(extraData, format) {
let parseData = "";
if (Array.isArray(extraData)) {
for (var i = 0; i < extraData.length; i++) {
if (extraData[i])
parseData += format.replace("${data}", extraData[i]);
}
} else {
parseData += format.replace("${data}", extraData);
}
return parseData;
},
async getValue(key, item) {
const field = typeof key !== "object" ? key : key.field;
let indexes = typeof field !== "string" ? [] : field.split(".");
let value = this.defaultValue;
if (!field) value = item;
else if (indexes.length > 1)
value = await this.getValueFromNestedItem(item, indexes);
else value = this.parseValue(item[field]);
if (key.hasOwnProperty("callback"))
value = await this.getValueFromCallback(value, key.callback);
return value;
},
/*
convert values with newline \n characters into <br/>
*/
valueReformattedForMultilines(value) {
if (typeof value == "string") return value.replace(/\n/gi, "<br/>");
else return value;
},
preprocessLongNum(value) {
if (this.stringifyLongNum) {
if (String(value).startsWith("0x")) {
return value;
}
if (!isNaN(value) && value != "") {
if (value > 99999999999 || value < 0.0000000000001) {
return '="' + value + '"';
}
}
}
return value;
},
getValueFromNestedItem(item, indexes) {
let nestedItem = item;
for (let index of indexes) {
if (nestedItem) nestedItem = nestedItem[index];
}
return this.parseValue(nestedItem);
},
async getValueFromCallback(item, callback) {
if (typeof callback !== "function") return this.defaultValue;
const value = await callback(item);
return this.parseValue(value);
},
parseValue(value) {
return value || value === 0 || typeof value === "boolean"
? value
: this.defaultValue;
},
base64ToBlob(data, mime) {
let base64 = window.btoa(window.unescape(encodeURIComponent(data)));
let bstr = atob(base64);
let n = bstr.length;
let u8arr = new Uint8ClampedArray(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], {type: mime});
},
}, // end methods
});
</script>