Enable wdg import

src/classes/display/form.js

@@ -26,7 +26,14 @@ export class Button extends FormElement {
     this.button.setAttribute('type', opts.type ?? 'button');
     this.button.innerHTML = name;
     this.button.disabled = !!opts.disabled;
-    this.el.appendChild(this.button);
+    if (opts.label) {
+      this.label = document.createElement('label');
+      this.label.innerHTML = opts.label;
+      this.label.appendChild(this.button);
+      this.el.appendChild(this.label);
+    } else {
+      this.el.appendChild(this.button);
+    }
   }
 }
 
@@ -84,6 +91,20 @@ export class SubForm extends FormElement {
   }
 }
 
+export class FileInput extends FormElement {
+  constructor(name, form, opts) {
+    super(name, form, opts);
+    this.input = document.createElement('input');
+    this.input.type = 'file';
+    this.input.accept = 'application/json';
+    // this.input.classList.add('visually-hidden')
+    this.label = document.createElement('label');
+    this.label.innerHTML = name;
+    this.label.appendChild(this.input);
+    this.el.appendChild(this.label);
+  }
+}
+
 export class Form extends Box {
   constructor(document, opts = {}) {
     super(opts.name, opts.parentEl || document.el, { tagName: 'form', ...opts });
@@ -99,6 +120,11 @@ export class Form extends Box {
     return this;
   }
 
+  submit(opts) {
+    this.items.push(new Button(opts.name, this, { ...opts, type: 'submit' }));
+    return this;
+  }
+
   textField(opts) {
     this.items.push(new TextField(opts.name, this, opts));
     return this;
@@ -119,6 +145,11 @@ export class Form extends Box {
     return this;
   }
 
+  fileInput(opts) {
+    this.items.push(new FileInput(opts.label || opts.name, this, opts));
+    return this;
+  }
+
   get lastItem() {
     return this.items[this.items.length - 1];
   }

src/classes/supporting/edge.js

@@ -112,10 +112,9 @@ export class Edge {
       name: 'Add Edge Type',
       cb: () => addEdgeForm(new Edge(graph, null, graph.getVertex(from), graph.getVertex(to))),
     })
-      .button({
+      .submit({
         id: 'save',
         name: 'Save',
-        type: 'submit',
         cb: ({ form: { value: { edges } } }) => {
           // Do validation
           for (const { type, weight } of edges) {

src/classes/supporting/vertex.js

@@ -108,10 +108,9 @@ export class Vertex {
       cb: () => addPropertyForm('', ''),
     });
 
-    form.button({
+    form.submit({
       id: 'save',
       name: 'Save',
-      type: 'submit',
       cb: ({ form: { value: formValue } }) => {
         let fullRedraw = false;
         if (vertex && formValue.id !== vertex.id) {

src/classes/supporting/wdg.js

@@ -45,15 +45,36 @@ export class WeightedDirectedGraph {
 
   toJSON() {
     return {
+      name: this.name,
       vertices: Array.from(this.vertices.values())
         .map((vertex) => vertex.toJSON()),
       edges: Array.from(this.edgeTypes.values())
         .flatMap((edges) => Array.from(edges.values()))
         .map((edge) => edge.toJSON()),
-      history: this.getHistory(),
+      // history: this.getHistory(),
     };
   }
 
+  fromJSON({ name, vertices, edges }) {
+    this.name = name;
+    this.vertices.clear();
+    this.edgeTypes.clear();
+    for (const {
+      id, type, label, properties,
+    } of vertices) {
+      const vertex = this.addVertex(type, id, null, label);
+      for (const [key, value] of Object.entries(properties)) {
+        vertex.setProperty(key, value);
+      }
+    }
+    for (const {
+      from, to, type, weight,
+    } of edges) {
+      this.addEdge(type, from, to, weight);
+    }
+    this.redraw();
+  }
+
   redraw() {
     // Call .reset() on all vertices and edges
     for (const vertex of this.vertices.values()) {
@@ -108,11 +129,12 @@ export class WeightedDirectedGraph {
 
   resetEditor() {
     this.editorDoc.clear();
+    this.controlDoc.clear();
     Vertex.prepareEditorDocument(this, this.editorDoc);
     const form = this.controlDoc.form({ name: 'controlForm' }).lastElement;
     form.button({
-      id: 'export',
-      name: 'Export',
+      name: 'Download',
+      label: 'Export',
       cb: () => {
         const a = window.document.createElement('a');
         const json = JSON.stringify(this.toJSON(), null, 2);
@@ -123,6 +145,17 @@ export class WeightedDirectedGraph {
         a.click();
       },
     });
+    form.fileInput({
+      label: 'Import',
+      cb: ({ input: { files: [file] } }) => {
+        const reader = new FileReader();
+        reader.onload = ({ target: { result: text } }) => {
+          const data = JSON.parse(text);
+          this.fromJSON(data);
+        };
+        reader.readAsText(file);
+      },
+    });
   }
 
   addVertex(type, id, data, label, options) {

src/tests/scripts/wdg.test.js

@@ -50,8 +50,8 @@ describe('Weighted Directed Graph', function tests() {
 
   it('can export to JSON', () => {
     const result = graph.toJSON();
-    console.log('export to JSON, result', result);
     result.should.eql({
+      name: 'test1',
       vertices: [
         {
           id: '0', type: 'v1', label: '0', properties: {},
@@ -95,9 +95,59 @@ describe('Weighted Directed Graph', function tests() {
           weight: 0.125,
         },
       ],
-      history: [],
+      // history: [],
     });
   });
+
+  it('can import from JSON', () => {
+    const graph2 = new WeightedDirectedGraph('hidden1');
+    graph2.fromJSON({
+      name: 'hidden1import',
+      vertices: [{
+        id: '1',
+        label: '1',
+        type: 'v1',
+        properties: {
+          color: 'green',
+        },
+      }, {
+        id: '2',
+        label: '2',
+        type: 'v1',
+        properties: {
+          color: 'blue',
+        },
+      }],
+      edges: [{
+        from: '1',
+        to: '2',
+        type: 'e1',
+        weight: 0.5,
+      }],
+    });
+
+    graph2.vertices.size.should.equal(2);
+    graph2.edgeTypes.size.should.equal(1);
+    graph2.edgeTypes.get('e1').size.should.equal(1);
+
+    const v1 = graph2.getVertex('1');
+    v1.id.should.equal('1');
+    v1.label.should.equal('1');
+    v1.type.should.equal('v1');
+    v1.properties.size.should.equal(1);
+    v1.properties.get('color').should.equal('green');
+
+    const v2 = graph2.getVertex('2');
+    v2.id.should.equal('2');
+    v2.label.should.equal('2');
+    v2.type.should.equal('v1');
+    v2.properties.size.should.equal(1);
+    v2.properties.get('color').should.equal('blue');
+
+    const e1 = graph2.getEdge('e1', '1', '2');
+    v1.edges.from[0].should.equal(e1);
+    v2.edges.to[0].should.equal(e1);
+  });
 });
 
 describe('Editable', () => {