PhantomJS: Saving SVG for Future Use

I am attempting to save an SVG file from a sample testpage using PhantomJS. I have successfully navigated to the testpage, but I am unsure of how to locate and save the SVG element. Below is my current approach and where I am encountering difficulties.

  1. Visit the webpage
  2. Attempt to identify the SVG tag with document.getElementsByTagName('svg')
  3. What steps should I take next? I can see that PhantomJS returns a large object, but I cannot find any clear guidance on how to convert this object into an SVG file.

The structure of the testpage is as follows:

<HTML>

This is a Testpage. You like it, don't you?

<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink">

  <defs>
    <linearGradient id="myLinearGradient1"
                    x1="0%" y1="0%"
                    x2="0%" y2="100%"
                    spreadMethod="pad">
      <stop offset="0%"   stop-color="#00cc00" stop-opacity="1"/>
      <stop offset="100%" stop-color="#006600" stop-opacity="1"/>
    </linearGradient>
  </defs>

  <rect x="10" y="10" width="75" height="100" rx="10" ry="10"
     style="fill:url(#myLinearGradient1);
            stroke: #005000;
            stroke-width: 3;" />

</svg>

</HTML>

and here is the PhantomJS script being used:

var page = require('webpage').create();

console.log('The default user agent is ' + page.settings.userAgent);

function getSVG(link, callback) {
    page.open(link, function(status) {
        if (status !== 'success') {
            console.log('Unable to access network');
        } else {
            var ua = page.evaluate(function() {
                return document.getElementsByTagName('svg');
            });
            // Unsure of what action to take at this point
        }
        phantom.exit();
        callback();
    });
}

getSVG('testpage', function () {
    console.log('done');
});

Answer №1

Let's begin by capturing the SVG content from a webpage using JavaScript:
var svgContent = page.evaluate(function(){
    return document.querySelector("svg").outerHTML;
});
Next, we can write this SVG content to a file using Node.js:
var fs = require("fs");
fs.writeFile("output.svg", svgContent, function(err) {
    if (err) {
        console.error("Error writing file: ", err);
    } else {
        console.log("SVG content saved successfully!");
    }
});

This should help you get started with saving SVG content to a file. Keep in mind that CSS can also be used to manipulate SVG files further.

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