What methods are available to load sections of a complex SVG shape asynchronously?

I'm currently in the process of creating a website with a geographic map built using SVG, pulling data from OpenStreetMap. Due to its large size and potential for transformations such as zooming and moving, only a portion of it will be visible on the screen at one time. To address performance issues, I believe it might be necessary to asynchronously load parts of the map. Is there a method for achieving this? (Similar to CATiledLayer in iOS)

Could you shed some light on how websites like Google Maps handle this type of situation?

javascripthtmlcsssvgcatiledlayer

Answer №1

Utilizing svg inline instead of as a reference image allows for easy manipulation of the image components using javascript within the DOM.

// Inserting a black circle after a delay of 1 second
setTimeout(() => {
  var svgNS = "http://www.w3.org/2000/svg"
  var myImage = document.createElementNS(svgNS,"image")
  myImage.setAttributeNS(null,"x",20)
  myImage.setAttributeNS(null,"y",20) 
  myImage.setAttributeNS("http://www.w3.org/1999/xlink","xlink:href","https://picsum.photos/200/200")
  document.getElementById("mySVG").appendChild(myImage)
}, 1000)
<!-- existing svg image -->
<svg id="mySVG">
  <circle fill="red" cx="20" cy="20" r="20" />
  
</svg>

The illustration above demonstrates adding an image to an already present svg. A special thanks to Alex Moanga and Daveman for providing the javascript snippets.

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