Konva load stage with images and background video - save

Question

Hey guys so I have this konva js app that has your typical background video just like the demo or close to it. I am able to play the video background and add image objects on top of it etc. Now I want a way to save the stage in its current state. So I do state.stage.toJSON() and as expected it creates a serialized JSON object. Now here's where I am hung up. when I load the stage like so state.stage = Konva.Node.create(data.stage, "container"); the stage data gets loaded (it is the correct size and so forth) yet there is no background video, no images or anything how do I fix this? I don't even know if stage.toJSON is correct but the point is I need to save it, leave the page and load it back up at a future date.
state.backgroundVideo = new Konva.Image({
image: state.video,
draggable: false
});
state.video.addEventListener("loadedmetadata", function(e) {
state.backgroundVideo.width(state.width);
state.backgroundVideo.height(state.height);
});
state.anim = new Konva.Animation(function() {
// do nothing, animation just need to update the layer
}, state.layer);
state.layer.add(state.backgroundVideo);
state.layer.batchDraw();
const canvas = document.getElementsByTagName("canvas")[0];
state.canvas = canvas;

Answer 1

node.toJSON() doesnt serialize image or video objects from Konva.Image attributes.
To solve the issue you can save video or image src into custom attribute:
image.setAttr('source', imageURL);
A simple string will be serialized into JSON. Then after you created a node from the JSON Konva.Node.create(data.stage, "container");
You need to find such nodes and restore image or video manually
// "video-background" is a sample here
// you can define your own selector
const videoNode = stage.findOne('.video-background');
const source = videoNode.getAttr('source');
const video = document.createElement('video');
video.src = source;
videoNode.image(video);
For more information take a look here:
https://konvajs.org/docs/data_and_serialization/Complex_Load.html
https://konvajs.org/docs/data_and_serialization/Best_Practices.html

Answer 2

thanks #lavrton your comments really helped me figure it out. Rather than loading the stage directly however I just saved the data from the stage used the data to rebuild the stage in the exact same way. Heres the code I used to get the data to save.
Heres my code:
const groups = state.stage.find("Group");
const stageData = [];
for (let x = 0; x < groups.length; x++) {
let g = groups[x];
let i = g.findOne("Image").getAttrs();
let group = { x: g.getX(), y: g.getY() };
let image = { x: i.width, y: i.height };
let obj = { image, group, jsonId: g.getAttr("jsonId") };
stageData.push(obj);
}
console.log("stageData", stageData);