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how to export svg form web page in js

https://stackoverflow.com/questions/2483919/how-to-save-svg-canvas-to-local-filesystem

1. server return

2. base64 encode

// This example was created using Protovis & jQuery
// Base64 provided by http://www.webtoolkit.info/javascript-base64.html
// Modern web browsers have a builtin function to this as well 'btoa'
function encode_as_img_and_link(){
 // Add some critical information
 $("svg").attr({ version: '1.1' , xmlns:"http://www.w3.org/2000/svg"});

 var svg = $("#chart-canvas").html();
 var b64 = Base64.encode(svg); // or use btoa if supported

 // Works in recent Webkit(Chrome)
 $("body").append($("<img src='data:image/svg+xml;base64,
"+b64+"' alt='file.svg'/>"));

 // Works in Firefox 3.6 and Webit and possibly any browser which supports the data-uri
 $("body").append($("<a href-lang='image/svg+xml' href='data:image/svg+xml;base64,
"+b64+"' title='file.svg'>Download</a>"));
}

base64 bug

中文 bug ???

// Uncaught DOMException: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.

const getToday = (symbol = `-`) => {
  const date = new Date();
  const dd = String(date.getDate()).padStart(2, '0');
  // Month January is 0!
  const mm = String(date.getMonth() + 1).padStart(2, '0');
  const yyyy = date.getFullYear();
  // format
  const today = `${yyyy}${symbol}${mm}${symbol}${dd}`;
  // const today = mm + '/' + dd + '/' + yyyy;
  return today;
}

const getTodayTimestamp = (symbol = `-`) => {
  const date = new Date();
  const dd = String(date.getDate()).padStart(2, '0');
  // Month January is 0!
  const mm = String(date.getMonth() + 1).padStart(2, '0');
  const yyyy = date.getFullYear();
  const timestamp = date.getTime();
  // format
  const todayTimestamp = `${yyyy}${symbol}${mm}${symbol}${dd}${symbol}${timestamp}`;
  return todayTimestamp;
}

const svgBase64StringConvert = () => {
  const body = document.querySelector(`body`);
  // svg uuid
  const svg = document.querySelector(`svg`);
  const html = svg.parentElement.innerHTML;
  // let html = svg.parentNode.innerHTML;
  // let html = svg.innerHTML();
  // html = `
  //   <svg width="100%" height="100%" viewBox="0 0 1000 1000">
  //     ${html}
  //   </svg>
  // `;
  const base64String = btoa(html);
  const date = new Date();
  const time = date.getFullYear() + date.getMonth() + 1 + date.getDate();
  const timestamp = new Date().getTime();
  // const timestamp = getTodayTimestamp();
  const img = `
    <img
      src="data:image/svg+xml;base64, ${base64String}"
      alt="live-map-${timestamp}.svg"
      download="live-map-${timestamp}.svg"
    />
  `;
  const alink = `
    <a
      href="data:image/svg+xml;base64, ${base64String}"
      alt="live-map-${timestamp}.svg"
      download="live-map-${timestamp}.svg"
      data-class="visibility: none;"
    />
  `;
  body.insertAdjacentHTML(alink);
  alink.click();
  // remove alink
}

const svgToBase64String = () => {
  const body = document.querySelector(`body`);
  // svg uuid
  const svg = document.querySelector(`svg`);
  const html = svg.parentElement.innerHTML;
  const base64String = btoa(html);
  const date = new Date();
  const time = date.getFullYear() + date.getMonth() + 1 + date.getDate();
  const timestamp = new Date().getTime();
  const alink = `
    <a
      href="data:image/svg+xml;base64, ${base64String}"
      alt="live-map-${timestamp}.svg"
      download="live-map-${timestamp}.svg"
      data-class="visibility: none;"
    />
  `;
  body.insertAdjacentHTML(`beforeend`, alink);
  alink.click();
  // remove alink
}

https://stackoverflow.com/questions/23218174/how-do-i-save-export-an-svg-file-after-creating-an-svg-with-d3-js-ie-safari-an/23218877

3. XMLSerializer & serializeToString

//get svg element.
var svg = document.getElementById("svg");

//get svg source.
var serializer = new XMLSerializer();
var source = serializer.serializeToString(svg);

//add name spaces.
if(!source.match(/^<svg[^>]+xmlns="http://www.w3.org/2000/svg"/)){
    source = source.replace(/^<svg/, '<svg xmlns="http://www.w3.org/2000/svg"');
}
if(!source.match(/^<svg[^>]+"http://www.w3.org/1999/xlink"/)){
    source = source.replace(/^<svg/, '<svg xmlns:xlink="http://www.w3.org/1999/xlink"');
}

//add xml declaration
source = '<?xml version="1.0" standalone="no"?>
' + source;

//convert svg source to URI data scheme.
var url = "data:image/svg+xml;charset=utf-8,"+encodeURIComponent(source);

//set url value to a element's href attribute.
document.getElementById("link").href = url;
//you can download svg file by right click menu.

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solution

svg.outerHTML & svg.parentElement.innerHTML

const getTodayTimestamp = (symbol = `-`) => {
  const date = new Date();
  const dd = String(date.getDate()).padStart(2, '0');
  // Month January is 0!
  const mm = String(date.getMonth() + 1).padStart(2, '0');
  const yyyy = date.getFullYear();
  const timestamp = date.getTime();
  // format
  const todayTimestamp = `${yyyy}${symbol}${mm}${symbol}${dd}${symbol}${timestamp}`;
  return todayTimestamp;
}


const autoSVGDownload = (uuid = ``) =>{
  const timestamp = getTodayTimestamp();
  const filename = `SVG 现场图-${timestamp}.svg`;
  // const filename = `live-map-${timestamp}.svg`;
  // uuid
  const svg = document.querySelector(`svg`);
  // const html = svg.parentElement.innerHTML;
  const html = svg.outerHTML;
  // xml namespace, support browser open preview
  const xml = `<?xml version="1.0" encoding="UTF-8"?>
${html}`;
  const element = document.createElement('a');
  element.setAttribute('href', 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(xml));
  element.setAttribute('download', filename);
  element.style.display = 'none';
  document.body.appendChild(element);
  element.click();
  document.body.removeChild(element);
}


export {
  getTodayTimestamp,
  autoSVGDownload,
};

export default autoSVGDownload;

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