在joint.js中读JSON？

Question

I want joint.js library to read my JSON and display it as a chart...

var paper = new joint.dia.Paper({
    el: $('#paper'),
    width: 600,
    height: 200,
    model: graph
});

var graph = new joint.dia.Graph;

jsonstring = '{"employees": [ { "firstName":"John" , "lastName":"Doe" }, { "firstName":"Anna" , "lastName":"Smith" }, { "firstName":"Peter" , "lastName":"Jones" } ] }';

graph.fromJSON(JSON.parse(jsonstring));

Answer 1

From the API for joint.dia.Graph :

joint.dia.Graph is the model holding all the cells (elements and links) of the diagram. It's a Backbone model . The collection of all the cells is stored in the property cells.

So the expected JSON should be in this form: { cells: [] } . Where cells is an array of both elements and links. Each element should have the form:

{ 
    id: <string>, 
    type: '<type of shape>', 
    attrs: { <attrs> }, 
    position: { x: <int>, y: <int> }, 
    angle: <deg>, 
    size: { width: <int>, height: <int> }, 
    z: <int>, 
    ... and some other, maybe custom, data properties 
}

Reference: Using Server Data with JointJS