mxGraph -Save functionality not working locally

Question

I downloaded https://github.com/jgraph/mxgraph open source code from Git,this application Save functionality not working in the locally. Is there any possible for run the save functionality in Locally?. is there any configuration required for that? please help me.

After save button click getting below error message

Answer 1

I provide the code snippets for local save && upload of the saved file

code to export the xml of the current graph object

let encoder = new mxCodec();
let result = encoder.encode(graph.getModel());
let xml = mxUtils.getXml(result);
//workaround for the xml export, do not include the <mxGraphModel> tags
xml = xml.substring(xml.indexOf("<mxGraphModel>")+"<mxGraphModel>".length, xml.indexOf("</mxGraphModel>"));

code to upload the xml to re-generate the saved state of the graph

let doc = mxUtils.parseXml(xml);
let codec = new mxCodec(doc);
codec.decode(doc.documentElement, graph.getModel());
let elt = doc.documentElement.firstChild;
let cells = [];
while (elt != null)
{   
    let cell = codec.decode(elt)
    if(cell != undefined){
            if(cell.id != undefined && cell.parent != undefined && (cell.id == cell.parent)){
                elt = elt.nextSibling;
                continue;
            }
            cells.push(cell);
    }
    elt = elt.nextSibling;
}
graph.addCells(cells);

Answer 2

You can save locally by using the mxCodec class found in the IO package. Check out the example code here. I'm not sure how to tie it into that specific button, but find the function that is called when you click save and add/replace it with the three lines needed to encode as xml.

As for how to get that xml code to save as a file, I'm not sure. Perhaps you'll find that code when you modify the save button functionality. The easy way would be to create a div and replace its innerhtml with the xml data, then just copy it and save it yourself.