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I'm using the svg.js library.

How can we check if a variable x is an instance of SVG class?

I tried:

new SVG(document.createDocumentFragment()) instanceof SVG     // false
new SVG(document.createDocumentFragment()).contructor === SVG // false
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1 Answers1

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Checking what value SVG function returns we find that a new element is created and returned. It is an instance of SVG.Doc:

> SVG
svg.js:12 function (element) {
    if (SVG.supported) {
      element = new SVG.Doc(element)

      if (!SVG.parser)
        SVG.prepare(element)

      return element
    }
  }

So, the solution is:

new SVG(document.createDocumentFragment()) instanceof SVG.Doc // true

// or using the x variable
var x = new SVG(document.createDocumentFragment());
x instanceof SVG.Doc // true
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  • All svg.js elements are ultimately extending the `SVG.Element` class so you can also use that in the instanceof check – Fuzzyma Feb 15 '18 at 11:06